Midmark 419, 419-003, 419-004, 419-005, 419-006 Parts Manual

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Page 1

419

Service and

-003 thru -006

Power Procedure Table

Serial Number Prefixes: LM, LN, LP, LR & V

Parts Manual

NO LONGER IN PRODUCTION

Some service parts may not

be available for this production

FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

SF-1604 Part No. 004-0249-00 Rev. J (2/1/13)

419

-011 thru

-006

Page 2

RETURN TO TABLE

OF CONTENTS

Page 3

TABLE OF CONTENTS

Section/Paragraph................................................Page Section/Paragraph ............................................... Page

IMPORTANT INSTRUCTIONS

General Safety Instructions ..........................................iii

Safety Alert Symbols .................................................... iii

Warranty Instructions ................................................. iii

SECTION I GENERAL INFORMATION

1.1 Scope of Manual .......................................... 1-1

1.2 How to Use Manual ...................................... 1-1

1.3 Description of 419 Power

Procedure Table ........................................ 1-1

1.4 Standard Torque Specifications.................... 1-6

1.5 Specifications ............................................... 1-6

1.6 Parts Replacement Ordering........................ 1-8

1.7 Special Tools ................................................ 1-8

SECTION II TESTING AND TROUBLESHOOTING

2.1 Operational Test ........................................... 2-1

2.2 Troubleshooting Procedures......................... 2-5

SECTION III SCHEDULED MAINTENANCE

3.1 Scheduled Maintenance ............................. 3-1

SECTION IV MAINTENANCE/SERVICE INSTRUCTIONS

4.1 Introduction................................................... 4-1

4.2 PC Control Board Calibration

(Programmable Tables Only)..................... 4-1

4.3 PC Control Board Removal / Installation

(Non-Programmable Tables Only)............. 4-2

4.4 PC Control Board Removal / Installation

(Programmable Tables Only)..................... 4-3

4.5 Tilt Actuator Removal / Installation ............... 4-4

4.6 Tilt Capacitor Removal / Installation ............. 4-7

4.7 Back Actuator Removal / Installation ............ 4-8

4.8 Back Capacitor Removal / Installation........ 4-10

4.9 Foot Actuator Removal / Installation........... 4-11

4.10 Foot Capacitor Removal / Installation......... 4-13

4.11 Base Actuator Removal / Installation.......... 4-14

4.12 Base Capacitor Removal / Installation........ 4-19

4.13 Column Assembly Removal / Installation ...4-20

4.14 Typical Actuator Motor

Removal / Installation .............................. 4-25

4.15 Base Down Limit Switch Removal /

Installation / Adjustment.......................... 4-26

4.16 Base Up Limit Switch Removal /

Installation / Adjustment.......................... 4-27

4.17 Chain Tension Check / Adjustment ............ 4-29

4.18 Eccentric Bearings Adjustment .................. 4-30

4.19 Hand / Foot Control Inlet PC Board

Removal / Installation.............................. 4-32

4.20 Hand Control PC Board

Removal / Installation ............................. 4-33

4.21 Foot Control Top Removal / Installation

(Non-Programmable Units) ..................... 4-34

4.22 Foot Control Top Removal / Installation

(Programmable Units)............................. 4-35

4.23 Foot Control PC Board

Removal / Installation.............................. 4-35

4.24 Typical Foot Control Foot Pedal Switch

Removal / Installation.............................. 4-36

4.25 Typical Foot Control Function Button

Switch Removal / Installation .................. 4-37

4.26 Typical Foot Control Lamp

Removal / Installation.............................. 4-37

4.27 Dbl. Articulating Headrest Stop Pin

Removal / Installation.............................. 4-38

4.28 Headrest Slide Mechanism Adjustment..... 4-39

4.29 Arm Rest Locking Mechanism

Removal / Installation.............................. 4-40

4.30 Back Slide Bearing

Removal / Installation.............................. 4-40

4.31 Foot Rest Extension Limit Switch

Removal / Installation.............................. 4-41

4.32 Foot Actuator Limit Switch

Removal / Installation.............................. 4-42

4.33 Base Actuator Limit Switch

Removal / Installation.............................. 4-44

4.34 AC Receptacle Removal / Installation ........ 4-46

4.35 Fuse Holder Removal / Installation ............ 4-47

4.36 Foot Rest Extension Latch Spring

Removal / Installation.............................. 4-47

4.37 Foot Position Sensor Removal / Installation /Adjustment

(Programmable Units Only) .................... 4-48

4.38 Tilt Position Sensor Removal / Installation / Adjustment

(Programmable Units Only) .................... 4-51

4.39 Back Position Sensor Removal / Installation / Adjustment

(Programmable Units Only) .................... 4-54

4.40 Base Position Sensor Removal / Installation / Adjustment

(Programmable Units Only) .................... 4-58

(*) Indicates that there has been a serial number break for the illustration

and that there are additional point page(s) following the original page.

Rev. 2/02

Page 4

TABLE OF CONTENTS

Section/Paragraph................................................Page Section/Paragraph............................................... Page

SECTION V SCHEMATICS AND DIAGRAMS

5.1 Electrical Schematics /

Wiring Diagrams ....................................... 5-1

5.2 Fuse Specifications ...................................... 5-7

5.3 Error Codes Chart

(Programmable Units Only)....................... 5-7

SECTION VI PARTS LIST

6.1 Introduction................................................... 6-1

6.2 Description of Columns ................................ 6-1

6.3 Torque Specifications And Important

Assembly Notes ........................................ 6-1

Pictorial Index (419-003) ............................6-2.*

Pictorial Index (419-004) ............................6-3.*

Pictorial Index (419-005) ............................6-4.*

Pictorial Index (419-006) .............................. 6-5

Upholstery Kit............................................... 6-6

Articulated Headrest Assembly ...................6-7*

Arm Rest .....................................................6-8*

Backrest Assembly ......................................6-9*

Arm Linkage Components.......................... 6-10

Seat Components ...................................... 6-11

Top to Base Connections ........................... 6-12

Top Electrical Components (115 V. Units).. 6-13 Top Electrical Components (230 V. Units).. 6-14

Foot Components ...................................... 6-15

Program Position Components .................. 6-16

Base Reducer Assembly............................ 6-17

Foot Sensor Components .......................... 6-18

Back Sensor Components ......................... 6-19

Tilt Sensor Components ............................ 6-20

Base Cover Components ........................... 6-21

Base Electrical Comp. (115 V. Units) ......... 6-22

Base Electrical Comp. (230 V. Units) ......... 6-23

Power Inlet Components............................ 6-24

Column Components ................................. 6-25

Column Assembly ...................................... 6-26

Hand Control Assm (Non-Programmable) . 6-27

Hand Control Assm (Programmable) ......... 6-28

Footswitch Assm (Non-Programmable) ..... 6-29

Footswitch Assm (Programmable) ............. 6-30

COMMENTS ............................................................. 7-1

FAX ORDER FORM.................................................. 7-2

(*) Indicates that there has been a serial number break for the illustration

and that there are additional point page(s) following the original page.

Rev. 7/03

Page 5

TABLE OF CONTENTS

General Safety Instructions

Safety First: The primary concern of Midmark Corporation is that this

of the patient and staff in mind. To assure that services and repairs are completed safely and correctly , proceed as follows:

(1) Read this entire manual before performing any

services or repairs on this table.

(2) Be sure you understand the instructions con-

tained in this manual before attempting to service or repair this table.

table is maintained with the safety

Safety Alert Symbols

Throughout this manual are safety alert symbols that call attention to particular procedures. These items are

used as follows:

DANGER

A DANGER is used for an imminently

hazardous ope rating procedure, practice, or condition which, if not correctly followed, will result in loss of life or serious personal injury .

CAUTION

A CAUTION is used fo r a potentially haz-

ardous operating procedure, practice, or condition which, if not correctly followed, could result in minor or moderate injury. It may also be used to alert against unsafe practices.

EQUIPMENT ALE RT

An EQUIPMENT ALERT is used for an

imminently or potentially hazardous operating procedure, practice, or condition which, if not correctly followed, will or could re sult in serious, moderate, or minor damage to unit.

NOTE

A NOTE is used to amplify an operating procedure, practice or condition.

Warranty Instructions

Refer to the Midmark “Limited Warranty” printed in the Installation and Operation Manual for warranty information. Failure to follow the guidelines listed below will void the warranty and/or render the 419 Power Procedure Table unsafe for operation.

WARNING

A WARNING is used for a potentially

hazardous ope rating procedure, practice, or condition which, if not correctly followed, could result in loss of life or serious personal injury.

• In the event of a malfunction, do not attempt to use the examination table until necessary repairs have been made.

• Do not attempt to disassemble table, replace malfunctioning or damaged components, or perform adjustments unless you are one of Midmark’s authorized service technicians.

• Do not substitute parts from another manufacturer when replacing inoperative or damaged components. Use only Midmark replacement parts.

Page iii

Printed in U.S.A.

Page 6

TABLE OF CONTENTS

Page iv

Printed in U.S.A.

Page 7

SECTION I

GENERAL INFORMATION

SECTION I

GENERAL INFORMATION

1.1

This manual contains detailed troubleshooting, scheduled maintenance, maintenance, service instructions, and a complete illustrated parts breakdown for the 419 (-003 thru -006) Power Procedure Table. This manual covers both programmable and non-programmable versions of this table. This manual is intended to be used by Midmark’s authorized service technicians.

Scope of Manual

1.2 How to Use Manual

A. Manual Use When Performing Scheduled Mainte-

nance.

(1) Perform inspections and services listed in

Scheduled Maintenance Chart (Refer to para 3.1).

(2) If a component is discovered to be faulty or out

of adjustment, replace or adjust component in accordance with maintenance / service instructions (Refer to para 4.1).

1.3 Description Of 419 (-003 thru -006)

Power Procedure T able

A. General Description (See Figure 1-1).

The 419 Power Procedure Table is a general purpose examination table designed specifically for performing general medical examinations and procedures. The table is available with or without programming. The programmable versions have additional features such as programmed positioning, a Home function, and audible warning signals.

Listed below are descriptions of the models available and their serial number prefixes:

419-003 (LM) .................115 VAC without programming

419-004 (LN).................. 115 VAC with programming

419-005 (LP) .................. 230 VAC without programming

419-006 (LR).................. 230 VAC with programming

B. Manual Use When Unit Is Malfunctioning And

Cause Is Unknown.

(1) Perform an operational test on unit (Refer to

para 2.1).

(2) Perform troubleshooting procedures listed in

Troubleshooting Guide (Refer to para 2.2).

(3) If a component is discovered to be faulty or out

of adjustment, replace or adjust component in accordance with maintenance / service instructions (Refer to para 4.1).

C. Manual Use When Damaged Component Is Known.

(1) Replace or adjust component in accordance

with maintenance / service instructions (Refer to para 4.1).

The major serviceable components of the table are: the tilt actuator, tilt capacitor, back actuator, back capacitor, foot actuator, foot capacitor, base actuator, base capacitor, base down limit switch, base up limit switch, PC control board, foot & hand control inlet PC boards, chain assembly, column assembly, headrest assembly, non-programmable foot control which includes foot switches and foot control interface board or a programmable foot control which includes foot switches, a foot control interface board, indicator L.E.D.’s, and program control footswitches, and the Foot Extension Crash Protection Circuit which includes the foot actuator limit switch, foot rest extension limit switch, and base actuator limit switch.

apply to programmable units only:

back position sensor, foot position sensor, and base reducer assembly which includes base position sensor.

The following serviceable components apply to the optional hand control:

hand control PC board.

The following serviceable components

tilt position sensor,

hand control switch panel and

Rev. 2/00

Page 1-1

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Page 8

SECTION I GENERAL INFORMATION

HEADLOCK

ASSEMBLY

FOOT EXTENSION

PROGRAM

CONTROL

FOOT

SWITCHES

(PROGRAMMABLE

FOOT CONTROL

ONLY)

FOOT

CONTROL

FOOT ACTUATOR

LIMIT SWITCH

ACTUATOR

FOOT

POSITION

SENSOR

BASE DOWN

LIMIT SWITCH

BASE

CAPACITOR

REDUCER

ASSEMBLY

INDICATOR

L.E.D.'S

(PROGRAMMABLE

FOOT CONTROL

ONLY)

CAPACITOR

FOOT

CAPACITOR

FOOT

BASE

FOOT

SWITCHES

ACTUATOR

BACK

INDICATOR

L.E.D.'S

BACK

POSITION

SENSOR

BASE

SENSOR

FOOT INLET

PC BOARD

TILT

BASE

ACTUATOR

COLUMN

ASSEMBLY

CAPACITOR

ACTUATOR

LIMIT SWITCH

PC CONTROL

BOARD

BASE

ACTUATOR

LIMIT SWITCH

CONTROL

PC BOARD

SWITCH PANEL

TILT

BASE UP

CHAIN

ASSEMBLY

HAND INLET

PC BOARD

BACK

POSITION

SENSOR

HAND

CONTROL

HAND

CONTROL

MA523501

Rev. 2/02

Figure 1-1. Major Components

Page 9

SECTION I

GENERAL INFORMATION

B. Standard Theory of Operation (See Figures 5-1

thru 5-6 for wiring diagram / electrical schematic)

Electrical power

Line voltage is supplied thru two main fuses to the table’s PC control board. These fuses prevent possible damage to the PC control board due to excessive current draw. There is a transformer and associated followon circuitry on the PC control board which reduces the line voltage to 12 VDC. The 12 VDC provides power to operate the circuitry on the PC control board, foot control, and hand control.

Manual Operation of Tilt, Back, and Foot Actuator Assemblies:

When a function is selected using the foot control, the foot control sends a signal to the PC control board. The signal causes the appropriate relay on the PC control board to energize (i.e., if the TILT UP button is depressed on foot control, the Tilt Up relay on PC control board is energized). Line voltage is continuously supplied to all relays on PC control board. So, when a relay is energized, the line voltage flows thru the relay and is applied across the windings of the actuator motor, causing it to run. When the foot control button is released, the relay de-energizes, removing the line voltage from the windings of the actuator motor and causing it to stop running.

The Tilt, Back, and Foot actuators are ball screw driven. The actuator assemblies contain a pivot point on the end of the ball screw. If an actuator assembly is run to the end of its stroke, the ball screw shaft spins inside the nut, which allows the actuator assembly to run without damaging or advancing the nut.

The Tilt, Back, and Foot actuators have internal braking mechanisms which use friction to hold the actuator in place. When the actuator is run, the actuator overcomes the force of the friction, allowing it to move. When actuator is stopped, friction holds the actuator in place.

Manual Operation Of Base Actuator Assembly:

continuously supplied to the relays on PC control board. So, when the base up or down relay is energized, the line voltage flows thru the relay and is applied across the windings of the actuator motor, causing it to run. At the same time, line voltage flows thru the brake relay and is applied across the solenoid coil of the base brake, causing the brake to disengage. When the foot control button is released, the relays de-energize, removing line voltage from the coils of the actuator motor, causing it to stop and at the same time, removing line voltage from the solenoid coil of the base actuator brake, causing the base brake to engage.

The base actuator is different from the other three actuators; it does not freewheel at the end of its stroke limit. This is because the base actuator operates under heavier loads. To prevent the base actuator from reaching its stroke limits, which could damage the actuator, two limit switches are used; a base down limit switch and a base up limit switch. These limit switches are normally closed (N.C.) switches. When the base actuator reaches the end of the travel (up or down), the appropriate limit switch is tripped, opening the circuit. The PC control board then de-energizes the motor relay and base brake relay, causing the base actuator motor to stop running and the base brake to engage.

Foot Extension Protection Circuit:

To prevent the foot extension from accidentally being run into the floor, three limit switches are used: the foot rest extension limit switch, foot actuator limit switch, and base actuator limit switch. These limit switches are connected in parallel and table functions will operate normally unless

all three

switches are

open

. If all three limit switch circuits are open, the PC control board will prevent movement of Tilt Down, Table Down, and Foot Down functions and illuminate the Foot Rest Extension lamp on the hand control until any (one or all) of the limit switches are closed.

The foot rest extension limit switch (located behind the foot slide weldment) is a normally open (N.O.) switch. However, when the foot rest extension is in its fully retracted position, the limit switch is tripped, creating a closed circuit.

When a BASE UP or BASE DOWN function is selected using the foot control, the foot control sends a signal to the PC control board. The signal causes the base up or down relay, and the base brake relay on the PC control board to energize (i.e., if the BASE UP button is depressed on hand control, the base up and base brake relays on PC control board energize). Line voltage is

Rev. 2/00

Page 1-3

The foot actuator limit switch (mounted on the foot actuator) is a normally closed (N.C.) switch. When the foot section is between -40° and -90°, the limit switch is tripped, resulting in an open circuit.

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Page 10

SECTION I GENERAL INFORMATION

The base actuator limit switch (mounted on the base actuator) is a normally closed (N.C.) switch. When the base actuator is between full down and 1/2 way up, the limit switch is tripped resulting in an open circuit.

General Information:

All actuator motors have a thermal overload switch which will activate if the actuator is run continuously and overheats. The actuator motor is not designed for continuous operation; it is designed for intermittent operation. The normal cool off period for the thermal overload switches is 10 - 20 minutes.

Each actuator motor has a capacitor which provides start up power and motor run power.

There are two 0.10 amp Time Lag fuses providing overcurrent protection to the input of the PC control board on the non-programmable table and two 0.15 amp Time Lag fuses providing over-current protection to the input of the PC control board on the programmable table.

There is a 5 amp, “Slo-Blo” Time Lag fuse to provide over-current protection for each function's relays (i.e, Tilt fuse protects TILT UP and TILT DOWN relays).

C. Program m able Tabl e Theory of Ope rat io n (See

Figures 5-1 thru 5-6 for wiring diagram / electrical schematic) (Applies only to tables with programmed positioning)

Operation Of Programmable Software:

The previous paragraphs have outlined the theory of operation for manual functions on both the programmable and non-programmable tables. The following paragraphs will describe control system functions on the programmable tables.

When the table is powered up, the control system initializes the PC control board and then checks for inputs. There are two functions which can be initiated by the operator using the foot control; a function to initiate the “Calibration” mode and a function to initiate the “Clear Diagnostics Codes” mode. Also, the PC control board checks if error codes are stored in memory to determine if the “error” mode should be initiated.

Additionally, there are two functions that may be initiated by depressing switches mounted on the PC control board; a function to initiate the “Calibration/Clear Data” mode (SW 2 on PC board) and a function to initiate the “Program/Fault Clear ” mode (SW 1 on PC board)

The “Calibration” function

be initiated by the tech-

must

nician if a new PC control board or position sensor is installed, the position sensor is adjusted, the table is not moving to a programmed position properly, or the table begins acting erratically. When the calibration mode is initiated, the PC control board runs all actuators to their up and down limits and measures the voltage output of the position sensors at the limits. These voltage values are stored in the PC control board’s memory and used as the basis for storing programmed positions into memory. Also, the error codes for incorrect direction and no sensor output change are cleared from the PC control board’s memory. If the calibration procedure is not successful due to a position sensor reading being out of limits, the error code indicating why will be stored into the PC control board’s memory along with an error code indicating the table is not calibrated. The PC control board emits a 1 second warning beep at 1.5 second intervals to indicate to the operator that the calibration procedure is taking place. The calibration procedure is described in Section IV, Maintenance.

The “Clear Diagnostics Codes” function must be initiated to reset the PC Control Board, after the PC control board initiates any error code(s). The PC control board displays the error code(s) by alternately flashing the PROGRAM lamp and the FOOT REST EXTENSION lamp to form a code (See Diagnostic code [error code] operation later in this section). When the table is in the error code mode, only manual positioning of the table will work. To resume normal operation, the “Clear Diagnostic Codes” procedure must be completed. If the PC control board is replaced or the position sensor is replaced or adjusted, this procedure will not work; in this case, the “Program/Fault Clear” mode followed by the Calibration procedure must be performed. This step is described in the appropriate procedures in Section IV, Maintenance.

The “Calibration/Clear Data” mode is initiated when it is desired to clear the PC control board’s memory where the calibration data is stored. This step is described in the appropriate procedures in Section IV, Maintenance.

The “Program/Fault Clear” mode is initiated when it is desired to clear the PC control board’s memory where the error codes and program position data are stored. This function should be used if the PC control board seems locked up or if a position sensor is replaced / adjusted. The “Program/Fault Clear” function is described in the appropriate procedures in Section IV, Maintenance.

Rev. 2/00

Page 1-4

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Page 11

SECTION I GENERAL INFORMATION

Operation of Home Position Function:

When the operator presses the Home position button, the PC control board lowers the base actuator until the base down limit switch is tripped. The Home position button can be pressed and released; it does not have to be held down to continue movement. If the base down limit switch is not detected as being tripped (open circuit) within 18 seconds from the time the Home position button was pressed, the PC control board de-energizes the base actuator. If Base Up function button is pressed while the table is moving toward the Home position, the Home position function is terminated and Base Up is initiated until button is released.

Stop Function Operation:

When the Stop button is pressed, the PC control board terminates all functions, stopping table movement. When the Stop button is released, the stop mode is cancelled and normal table operation may resume.

Program Mode Operation:

The Program Mode is used to allow the operator to program up to four different table top positions into memory. When the Program Mode button is pressed, the Program Mode function stays active for five seconds, or until the operator has pressed one of the four Programmed Position buttons, or the Stop button is pressed. Also, the Program Mode lamp is illuminated and stays illuminated until the 5 seconds are up or an action is taken. When a Programmed Position button is pressed, the PC control board stores the position sensor voltage values for each axis into its memory. Then, if the position was stored correctly, the PC control board flashes the Program Mode lamp three times.

Programmed Position Recall Mode:

To recall a program that is stored in memory, the operator selects one of the four Programmed Position Recall buttons. The button must be pressed and held to continue table movement. The PC control board determines which direction to run the actuators by comparing the current position sensor voltage output for each axis with the voltage values stored in memory for each axis. The PC control board energizes the relays for the actuators requiring movement and then monitors the position sensor voltage output for each axis. When the position sensor voltage output of each position sensor matches the value stored in the PC control board’s memory, the PC control board de-energizes the actuator relays.

The PC control board has a maximum run time it allows for each actuator at any one time. This feature prevents damage to an actuator motor because of an actuator relay sticking. When a Programmed Position button is pressed, the PC control board starts a countdown of the maximum time allowed for that actuator. At the end of the countdown, if the button is still sensed by the PC control board as being pressed, and the actuator has not reached its limit, the PC control board de-energizes the relay for the actuator. The maximum run time for each function is:

• Base Up / Base Down - 18 seconds

• Back Up / Back Down - 25 seconds

• Foot Up / Foot Down - 25 seconds

• Tilt Up / Tilt Down - 25 seconds

During the Programmed Position Recall mode, the PC control board monitors for several error conditions: If it is detected that a position sensor’s voltage is increasing when it should be decreasing, decreasing when it should be increasing, or data input from a position sensor is invalid, the PC control board stops the table and sets an error code condition. An explanation of the error codes is given in para 5.2. If data stored for the Programmed Position Recall button being pressed is invalid, the Program lamp will flash on and off until the button is released. If the base down limit switch or base up limit switch is tripped (open circuit), the PC control board disables the Programmed Position Recall mode. If the Foot Extension Crash Protection Circuit is open (

all three

limit switch circuits must be

open

), the PC control board disables the Program Positioning mode and the Foot Rest Extension lamp will flash on and off until the button is released. If the Stop button is pressed, the Programmed Position Recall mode is disabled.

Manual Positioning Table Operation:

During manual positioning operation, the control system for the programmable table works like the control system for the non-programmable table except for some additional controls: If there is invalid data inputs from any position sensor, the PC control board still allows manual positioning operation. If conflicting functions are attempted such as Base Up and Base Down, the PC control board disables all functions until all buttons are released.

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Page 12

SECTION I GENERAL INFORMATION

Diagnostic Code (Error Code) Operation:

When the PC control board detects an error condition, it disables the Home position and Programmed Position functions. When these buttons are pressed, there is no movement. By unplugging the table power cord for a minimum of ten seconds, and then plugging it back in, the PC control board is put into the “diagnostic code” mode, described as follows: At power up, if an error code is stored in memory, the PC control board outputs the error code to the foot control in the form of a code. The Program Mode lamp flashes on and then off for the number of times equal to the first digit of the error code stored in memory. Then the Foot Extension lamp flashes on and then off for the number of times equal to the second digit of the error code stored into memory. The PC control board then waits one second, repeats the error code a second time, then waits one second and repeats the error code a third time. The next error code is also displayed three times consecutively. This is repeated until all error codes have been displayed. Then, the PC control board continuously displays the error codes on the foot control until a manual function is selected.

Position Sensor Operation:

There are position sensors mounted to pivot points on the Back, Tilt, and Foot axis and a position sensor mechanism (called a base reducer assembly) attached to the column assembly for the base function. As each axis moves, the corresponding position sensor’s inner wheel rotates with the axis. The position sensor is a variable resistor which changes resistance in a linear manner when rotated. So when the axis moves, the position sensor’s voltage output changes, due to its resistance change, based upon how far the axis has moved. The PC control board interprets the voltage value to determine the location of an axis. When a programmed position is programmed by the operator, the PC control board stores each sensor’s voltage value into memory. When the operator wishes to return to that stored position later, the programmed position button for the desired programmed position is depressed. The PC control board determines the current position the table based on the voltage output of the position sensors, and then determines which axis’ must be moved and in what direction. The PC control board energizes the relays for these actuators and moves the table section(s) to the desired programmed position. The PC control board stops the actuators when the voltage value of the position sensors matches the values stored in the PC control board’s memory.

1.4 Standard Torque Specifications

The following torque specifications in Table 1-1 apply to the various hardware used on the unit unless otherwise listed elsewhere in the service procedures or parts illustrations:

Table 1-1. Torque Specifications

Hardware Size Torque Values

#6 ............................ 11 to 21 inch / lbs. (1.2 to 2.3 N•m)

#8 ............................ 20 to 30 inch / lbs. (2.2 to 3.3 N•m)

#10 .......................... 32 to 42 inch / lbs. (3.6 to 4.8 N•m)

1/4 inch ................... 75 to 85 inch / lbs. (8.5 to 9.6 N•m)

5/16 inch .................18 to 22 ft. / lbs. (24.4 to 29.8 N•m)

3/8 inch ...................31 to 35 ft. / lbs. (42.0 to 47.5 N•m)

1/2 inch ...................50 to 60 ft. / lbs. (67.8 to 81.4 N•m)

1.5 Specifications

Factual data for the 419 Power Procedure Table is provided in Table 1-2. Also, see Figure 1-2.

Table 1-2. Specifications

Description Data

Weight:

Without Shipping Carton.................515 lbs. (233.6 kg)

With Shipping Carton...................... 550 lbs. (249.5 kg)

Shipping Carton: ..... 54 in. "L" x 32 in. "W" x 33 in. "H"

(137.1 cm x 81.2 cm x 83.8 cm)

Maximum Patient Load: .................. 325 lbs. (147.4 kgs)

Dimensions (See Figure 1-2):

Table Top Length (w/headrest retracted)

(w/back down & foot up) ..............65.0 in. (165.1 cm)

(headrest extended)

Dbl. Articulating Headrest ....... adds 11 in. (27.9 cm)

Triple Articulating Headrest..... adds 15 in. (38.1 cm)

Footrest Extension (adjustable) .... adds 0.0 in to 8.0 in

(0 cm to 20.3 cm)

Table Top Width ...................................23 in. (54.4 cm)

Overall Width .......................................24 in. (61.0 cm)

Table Top Positioning:

Table Top Height ...................... 22 in. to 40 in. ±0.5 in.

(Adjustable) (55.9 +

Back Section ....................... 0° (horizontal) to +85° +

Foot Section......................... 0° (horizontal) to -90° +

Tilt Range...............0° (horizontal) to +30° +

1.3 cm to 101.6 + 1.3 cm) 5° 5°

5° (foot up)

Rev. 2/02

Page 13

SECTION I GENERAL INFORMATION

Dbl. Articulating Headrest 76" (193.0cm) Triple Articulating Headrest 80" (203.2 cm)

(165.1 cm)

23"

58.4

(

(TABLE

cm)

)

40"

(+/- 5")

(101.6 cm)

(MAX.)

22"

(+/- 5")

(55.9 cm)

(MIN.)

(20.3 cm)

90° (+/- 5°) (MAX.)

30° (+/- 5") (MAX.)

REMAIN HORIZONTAL WITH SEAT

+/- 5

° AS BACK SECTION IS

POSITIONED

32"

(81.28 cm)

6.75"

(17.15 cm)

Figure 1-2. Dimensions

85° (+/- 5°) (MAX.)

24" (61 cm) (BASE)

POWER

CORD

(98.0" [248.9 cm])

MA524101

Table Speeds (@ 60 Hz):

Base Up ..................................... 18 - 31.5 seconds ±3

Back Up.................................................11 seconds ±3

Tilt Up....................................................17 seconds ±3

Foot Up ................................................... 8 seconds ±3

Power Cord:.............................. 98.0 in. (248.9 cm) long

A black jacketed molded cord to fit

IEC appliance inlet with destination

specific attachment plug

Electrical Requirements:

Model 419(-003 & -004)

115 VAC Units ......................115 VAC +

10%, 50/60 Hz

12 amp, single phase

Model 419 (-005 & -006)

230 VAC Units .....................230 VAC +

10%, 50/60 Hz

8 amp, single phase

Duty Cycle: .................................. Intermittent Operation

[15 seconds on/5 minutes

off (motor run time)]

Recommended Circuit: A separate (dedicated) circuit is recommended for this

table. The table should not be connected to an electrical

circuit with other appliances or equipment unless the circuit is rated for the additional load.

Classifications: ................ Class 1, Type B, Applied Part,

Ordinary Equipment,

Intermittent Operation

Certifications: Midmark Corporation ISO-9001 Certified Model 419(-003 & -004)

115 VAC Units...............................................UL2601-1

CAN/CSA 22.2, #601.1-M90 Model 419 (-005 & -006)

230 VAC Unit......... Complies to the applicable revision

of the MDD 93/42/EEC, Annex VII. Complies to the applicable requirements of EN6060-1-1, EN60601-1-2, EN60601-4

Rev. 2/02

Page 14

SECTION I

MA520001i

MODEL

NUMBER

SERIAL

NUMBER

GENERAL INFORMATION

1.6 Parts Replacement Ordering

If a part replacement is required, order the part directly from the factory as follows:

(1) Refer to Figure 1-3 to determine the location of

the model number and serial number of the unit and record this data.

(2) Refer to the Parts List to determine the item

numbers of the parts, part numbers of the parts, descriptions of the parts, and quantities of parts needed and record this data (Refer to para 6.1).

NOTE

Ask the Purchasing Department of the company that owns the unit for this information. Otherwise, this information may be obtained from the dealer that sold the unit.

SERIAL

NUMBER

Before: (7/26/2002)

MODEL

NUMBER

MA520000

(3) Determine the installation date of the unit and

record this data.

(4) Call Midmark with the recorded information and

ask for the Medical Products Technical Services Department. See back cover of this manual for the phone number or use the Fax Order Form (See page 7-2 for Fax Order Form).

1.7 Special Tools

Table 1-3 lists all of the special tools needed to repair the unit, how to obtain the special tools, and the purose

Figure 1-3. Model Number / Serial Number

After: (7/26/2002)

Location

of each special tool.

Description of Special Tool

Multimeter (with testing hooks) * Commercially Available Any Type Used to perform continuity and voltage checks. Protractor * Commercially Available Any Type Used to check the angle of motion for all movable

T15 Torx Wrench Commercially Available Any Type Used to loosen / tighten the screws securing the

5/16 in. - 18 x 1-1/4 Bolt (Quantity of 2)

Torque Wrench * Commercially Available Any Type Used to tighten nuts or screws to specified values.

Sensor Holder Tool (tool comes with a position sensor kit).

Manufacturer’s

Name / Address / Phone

Midmark Corporation 60 Vista Drive Versailles, Ohio 45380 (937) 526-3662

* Tool should be calibrated annually to ensure proper specifications are met.

Manufacturer’s

Part Number

table top sections.

position sensors, allowing adjustments to be made.

505-702308 Used to remove tension from eccentric bearings so

they may be adjusted.

046-0008-00 Used to hold the 5/16” hex drive while a position

sensor is being installed.

Purpose of Special Tool

Rev. 2/03

Page 15

TESTING AND TROUBLESHOOTING

SECTION II

TESTING AND TROUBLES HOOTING

SECTION II

2.1 Operational Test (See Figure 2-1, Sheets 1 and 2)

In order to effectively diagnose a malfunction of the 419, it may be necessary to perform an operational test as follows:

WARNING

Refer to the Operator Manual for com-

plete instructions on operating the table. Failure to do so could result in personal injury.

NOTE

The Operational Test only describes what should happen when the table is operated. If the table does something other than described, a problem has been discovered. Refer to the Troubleshooting Guide to determine the cause of the problem and its correction.

(1) Plug the table power cord into a properly rated

receptacle.

(2) Using the foot control, operate each table func-

tion (Base Up &Down, Back Up & Down, Tilt Up

& Down, Foot Up & Down)

Range of Motion:

Base down to Base up ......22.38 to 40.38 in.±0.5 in.

(56.8 to 102.5 cm ±1.3 cm)

Back down to Back up........................ 0° to +85° +

Tilt down to Tilt up.............................. 0° to +30° +

Foot down to Foot up ..........................-90° to 0° +

(3) If the table has an optional hand control, repeat

step 2 using the hand control.

(4) Raise foot section to the horizontal position;

then squeeze foot rest extension release handle and pull foot rest extension out as far as it will go.

(5) Depress BASE UP, and TILT UP buttons on foot

control and hold until each function reaches maximum height; then depress FOOT DOWN button and hold until foot section is approximately 1/2 way down.

(6) Depress BASE DOWN, FOOT DOWN, and

TILT DOWN buttons on foot control and hold.

Observe. Table should go approximately 1/2

way down then BASE DOWN, FOOT DOWN, and TILT DOWN functions should stop and the Foot Rest Extension lamp on the foot control should flash.

5° 5°

5°

Observe. When a fucntion is initiated, the table

should move accordingly. No section of the table top should drift after the foot control pedal is released. Actuator assembly should not make excessive squealing noises. Movement should be steady and should match the speeds and range of motions listed below:

Table Speeds (@ 60 Hz):

Base down to Base up ......... 18 - 31.5 ±3 seconds

Back down to Back up......................11 ±3 seconds

Tilt down to Tilt up ............................17 ±3 seconds

Foot down to Foot up..........................8 ±3 seconds

Rev. 2/02

(7) Squeeze foot rest extension handle and push

foot rest extension inward until it locks into its stowed position; then depress BASE DOWN, FOOT DOWN, and TILT DOWN buttons on foot control and hold.

Observe. Foot Rest Extension lamp on foot

control should go out and all functions should lower to their minimum heights.

(8) Place approximately 325 lbs. (147.4 kg) of

weight on the seat section of the table top.

(9) Depress BASE UP button on foot control.

Observe. The base actuator should not squeal

or make excessive noise when lifting the weight. The base actuator should be able to lift the weight. The base actuator should not hum or make any other type of noise when the table top reaches maximum height. The base up limit

Page 16

SECTION II TESTING AND TROUBLESHOOTING

switch should trip, stopping the base actuator from running. The base actuator brake should engage properly and hold the load without drifting down.

(10) Depress BASE DOWN button on foot control.

Observe. The base actuator should not squeal

or make excessive noise when lowering the weight. The actuator assembly should not hum or make any other type of noise when the table top reaches its minimum height. The base down limit switch should trip, stopping the base actuator from running.

(11) Remove weight from seat section of table top.

(12) Using either the release button (old style), or

release handle (new style) on the headrest, reposition headrest at each pivot point.

Observe. Headrest should release and move

easily at each pivot point. Headrest should lock securely into position when button is released or handle is returned to locked position.

(13) Slide the headrest assembly in and out of the

headrest slide mechanism releasing at various positions to observe.

Observe. Headrest assembly should not move

out of position on its own, or require excessive force to be positioned.

(14) Pull outward on arm rest knob and rotate arm

rest 180°.

Observe. Arm rest should rotate freely when

release knob is pulled, and lock securely in place 180° from point of origin.

Observe. When the HOME POSITION button

is pressed, the table top should begin to lower. When the STOP button is pressed, the table top should stop lowering.

(17) Press the HOME POSITION button and allow

the table top to lower completely.

Observe. When the table top is completely low-

ered, the base actuator should stop running automatically, indicating that the base down limit switch is tripped.

(18) If the table has an optional hand control, repeat

steps 15 thru 17 using the hand control.

NOTE

After the PROGRAM button is pressed, the operator has approximately 5 seconds to press one of the four Program Position buttons. At the end of the 5 seconds, the PROGRAM MODE lamp turns off, indicating that the program mode has ended.

(19) Press the PROGRAM button and then within 5

seconds, press the Program Position “1” button.

Observe. When the PROGRAM button is

pressed, the PROGRAM MODE lamp will illuminate. Then, when the Program Position “1” button is pressed, the PROGRAM MODE lamp will go off and then flash three times to indicate that the table position data was successfully stored into the PC control board’s memory.

(20) Use any of the foot control buttons to move the

table top to a new position.

(21) Press and hold the Program Position “1” button

until the table stops moving.

NOTE

The remaining steps apply to programmable units only. Refer to Figure 2-1 (Sheet 2 of 2) for these steps.

(15) Depress BASE UP button on foot control until

table reaches its maximum height.

(16) Press the HOME POSITION button for one sec-

ond and then release it. After the table top lowers halfway, press the STOP button.

Rev. 2/02

Observe. The table top should move back to

the position programmed in step 19.

(22) Repeat steps 19 thru 21 three more times using

Program Position buttons “2”, “3” and then “4”.

(23) If the table has an optional hand control, repeat

steps 19 thru 21 using the hand control.

Page 17

SEAT

SECTION

180

SECTION II

TESTING AND TROUBLESHOOTING

HEADREST

RELEASE

BUTTON/HANDLE

FOOT

SECTION

FOOT

EXTENSION

RELEASE

HANDLE

BACK

FUNCTION

BUTTON

AND LAMP

TABLE

FUNCTION

BUTTON

AND LAMP

TILT

FUNCTION

BUTTON

AND LAMP

D M

ARMREST

KNOB

TILT

BACK

BACK DOWN

BACK

FUNCTION

AR M

BUTTON

AND LAMP

TILT

DOWN

TABLE DOWN

FOOT REST EXTENSION

LAMP

FOOT

DOWN

TABLE

FOOT

PEDAL

Rev. 2/02

Figure 2-1. Operational Test (Sheet 1 of 2)

Page 18

SECTION II TESTING AND TROUBLESHOOTING

180

SEAT

SECTION

HEADREST

RELEASE

BUTTON/HANDLE

FOOT

SECTION

FOOT REST EXTENTION

RELEASE

HANDLE

PROGRAMMED

POSITION

BUTTONS

AND LAMPS

BACK

FUNCTION

BUTTON

AND LAMP

HOME

FUNCTION

BUTTON

AND LAMP

PROGRAMMED

AND LAMPS

PROGRAM

BUTTON

R D MI

TABLE

FUNCTION

BUTTON

AND LAMP

POSITION

BUTTONS

FOOT

PEDAL

TILT

FUNCTION

BUTTON

AND LAMP

FOOT

FUNCTION

BUTTON

AND LAMP

STOP

BUTTON

BACK

DOWN

TILT

DOWN

TABLE DOWN

STOP

HOME

POSITION

PROGRAM

BACK

TILT

ARMREST

KNOB

FOOT REST EXTENSION

LAMP

FOOT

DOWN

TABLE

PROGRAM

POSTION

BUTTONS

PROGRAM

MODE LAMP

Figure 2-1. Programmable Units Operational Test (Sheet 2 of 2)

Rev. 2/02

Page 19

SECTION II

TESTING AND TROUBLESHOOTING

2.2 Troubleshooting Procedures

Table 2-1 is a Troubleshooting Guide which is used to

Table 2-1. Troubleshooting Guide

Problem Symptom Probable Cause Check Correction

Table will not operate when any of the functions on the foot control or hand control are selected.

No actions can be initiated from hand control.

When any foot/hand control button is pressed, nothing happens.

Table has power, but no functions can be initiated from hand control. Foot control works properly.

Power cord is not plugged into wall outlet and/or AC receptacle.

Facility circuit breaker providing power to unit is tripped.

Fuse(s) at power inlet blown. Perform continuity check

Wire connections loose. Check all wiring connec-

Primary fuse(s) on PC control board is blown.

PC control board is malfunctioning.

Fuse holders malfunctioning. Perform continuity check

AC receptacle malfunctioning.

Coil cord is not plugged into hand control or receptacle on table properly.

Hand control switch panel is malfunctioning.

Hand control PC board is malfunctioning.

determine the cause of the malfunction.

Check to see if power cord is plugged in.

Check to see if facility circuit breaker for unit is tripped. One way of checking this is to plug a lamp into wall outlet that table was plugged into.

on fuses.

tions from power cord to terminal block. Perform continuity check on wires. Use multimeter to check for proper voltage levels. See Figures 5-1 thru 5-6.

Refer to Figure 2-2 for this check. Perform continuity check on fuses.

Replace suspect PC control board with known working PC control board.

on fuse holder.

Perform continuity check on AC inlet.

Check if coil cord is plugged in properly.

Replace suspect hand control switch panel with known working hand control switch panel.

Replace suspect hand control PC board with known working hand control PC board.

Plug power cord into facility wall outlet and/or AC receptacle.

If facility circuit breaker is tripped, determine what caused the circuit breaker to trip, correct the problem, and then reset / replace the circuit breaker.

Replace blown fuse(s). Refer to para 5.2.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace blown fuse(s). Refer to para 5.2.

Replace PC control board. Refer to para 4.3 or 4.4.

Replace fuse holder. Refer to para 4.33.

Replace AC receptacle. Refer to para 4.34

Plug coil cord into hand control or receptacle on table. Clean any dirty connections.

Replace hand control switch panel. Refer to para 4.20

Replace hand control PC board. Refer to para 4.20.

Page 2-5

Printe d in U.S .A.

Page 20

Problem Symptom Probable Cause Check Correction

No actions can be initiated from hand control.

- Continued

One or more functions cannot be initiated from hand control.

No actions can be initiated from foot control.

Table 2-1. Troubleshooting Guide - Continued

Table has power, but no functions can be initiated from hand control. Foot control works properly.

- Continued

Some functions may be initiated with hand control, but at least one may not.

Table has power, but no functions can be initiated from foot control. Hand control works properly.

TESTING AND TROUBLESHOOTING

Control inlet PC board is malfunctioning.

Cord running from control inlet PC board to PC control board is disconnected or broken.

PC control board is malfunctioning.

Hand control switch panel is malfunctioning (switch membrane is malfunctioning).

Hand control PC board is malfunctioning.

Fuse for non-operating (suspect) function is blown.

Relay for non-operating (suspect) function is malfunctioning.

Coil cord is not plugged into foot control or receptacle on table properly.

Foot control PC board is malfunctioning.

Control inlet PC board is malfunctioning.

Plug foot control into suspect control inlet PC board and check for proper operation

Check cord to see if it is properly connected. Replace suspect cord with known working cord or perform continuity check on cord.

Replace suspect PC control board with known working PC control board.

Replace suspect hand control switch panel with known working hand control switch panel.

Plug foot control into suspect control inlet PC board and check for proper operation

Refer to Figure 2-2 for this check. Perform continuity check on suspect fuse.

Refer to Figure 2-2 for this check. When hand control button is pressed, observe relay L.E.D’s on PC control board. The L.E.D. for the function which was selected should illuminate to indicate that its relay is operating correctly.

Check if coil cord is plugged in properly.

Plug hand control into suspect control inlet PC board and check for proper operation.

Replace suspect control inlet PC board with known working control PC board.

SECTION II

If necessary, replace control inlet PC board. Refer to para

4.19.

Replace cord.

Replace PC control board. Refer to para 4.3 or 4.4..

Replace hand control switch panel. Refer to para 4.20.

If necessary, replace hand control PC board. Refer to para 4.20.

Replace blown fuse(s). Refer to para 5.2.

If relay L.E.D. does not illuminate properly, replace PC control board. Refer to para 4.3 or

4.4.

Plug coil cord into foot control or receptacle on table. Clean any dirty connections.

Replace foot control PC board. Refer to para 4.23.

Replace control inlet PC board. Refer to para 4.19.

Page 2-6

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Page 21

Problem Symptom Probable Cause Check Correction

No actions can be initiated from foot control.

- Continued

BACK UP and BACK DOWN functions do not work. All other functions work.

Table 2-1. Troubleshooting Guide - Continued

Table has power, but no functions can be initiated from foot control. Hand control works properly.

- Continued

Some functions may be initiated with foot control, but at least one may not.

When BACK UP and BACK DOWN buttons are pressed, table will not move (all other functions work).

TESTING AND TROUBLESHOOTING

Cord running from control inlet PC board to PC control board is disconnected or broken.

PC control board is malfunctioning.

A footswitch for a function is malfunctioning.

Foot control PC board is malfunctioning.

Fuse for non-operating (suspect) function is blown.

Relay for non-operating (suspect) function is malfunctioning.

Back capacitor is weak or blown.

Thermal overload switch in back actuator motor is activated.

5 amp BACK fuse for BACK UP and BACK DOWN functions is blown.

Wire connections loose. Check all wiring connec-

Back actuator assembly is malfunctioning.

Check cord to see if it is properly connected. Replace suspect cord with known working cord or perform continuity check on cord.

Replace suspect PC control board with known working PC control board.

Perform a continuity check on footswitch.

Replace suspect foot control interface board with known working foot control interface board.

Refer to Figure 2-2 for this check. Perform continuity check on suspect fuse.

Refer to Figure 2-2 for this check. When a footswitch is depressed, observe relay L.E.D’s on PC control board. The L.E.D. representing the function which was selected should illuminate to indicate its relay is operating correctly.

Replace suspect back capacitor with known working back capacitor.

_ Wait 10 to 20 minutes to allow

Refer to Figure 2-2 for this check. Perform a continuity check on 5 amp BACK fuse.

tions to back actuator assembly.

Replace suspect back actuator assembly with known working back actuator assembly.

SECTION II

Replace cord.

Replace PC control board. Refer to para 4.3 or 4.4.

Replace footswitch. Refer to para 4.25.

Replace foot control PC board. Refer to para 4.23.

Replace blown fuse(s). Refer to para 5.2.

If relay L.E.D. does not illuminate properly, replace PC control board. Refer to para 4.3 or

4.4.

Replace back capacitor. Refer to para 4.8.

back actuator motor to cool.

Replace blown fuse(s). Refer to para 5.2.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace actuator motor or back actuator assembly. Refer to para 4.14 or 4.7.

Page 2-7

Printe d in U.S .A.

Page 22

Problem Symptom Probable Cause Check Correction

BACK UP and BACK DOWN functions do not work. All other functions work. - Continued

TILT UP and TILT DOWN functions do not work. All other functions work.

TABLE UP and TABLE DOWN functions do not work. All other functions work.

Table 2-1. Troubleshooting Guide - Continued

When BACK UP and BACK DOWN buttons are pressed, table will not move (all other functions work). - Continued

When TILT UP and TILT DOWN buttons are pressed, the table will not move (all other functions work).

When TABLE UP and TABLE DOWN buttons are pressed, the table will not move (all other functions work).

TESTING AND TROUBLESHOOTING

PC control board is malfunctioning.

Tilt capacitor is weak or blown.

Thermal overload switch in tilt actuator is activated.

5 amp TILT fuse for TILT UP and TILT DOWN functions is blown.

Wire connections loose. Check all wiring connec-

Tilt actuator assembly is malfunctioning.

PC control board is malfunctioning.

Base capacitor is weak or blown.

Thermal overload switch in base actuator motor is activated.

Refer to Figure 2-2 for this check. Press BACK UP and then BACK DOWN button while observing the PC control board. The BACK UP L.E.D. should illuminate when the BACK UP button is pressed and the BACK DOWN L.E.D. should illuminate when the BACK DOWN button is pressed. If, not, the PC control board is malfunctioning.

Replace suspect tilt capacitor with known working tilt capacitor.

_ Wait 10 to 20 minutes to allow

Refer to Figure 2-2 for this check. Perform continuity check on 5 amp TILT fuse.

tions to tilt actuator assembly.

Replace suspect tilt actuator assembly with known working tilt actuator assembly.

Refer to Figure 2-2 for this check. Press TILT UP and then TILT DOWN button while observing the PC control board. The TILT UP L.E.D. should illuminate when the TILT UP button is pressed and the TILT DOWN L.E.D. should illuminate when the TILT DOWN butt on is press ed. If not, the PC control board is malfunctioning.

Replace suspect base capacitor with known working base capacitor.

_ Wait 10 to 20 minutes to allow

SECTION II

Replace PC control board. Refer to para 4.3 or 4.4.

Replace tilt capacitor. Refer to para 4.6.

tilt actuator motor to cool.

Replace blown fuse(s). Refer to para 5.2.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace actuator motor or tilt actuator assembly. Refer to para 4.14 or 4.5.

Replace PC control board. Refer to para 4.3 or 4.4.

Replace base capacitor. Refer to para 4.12.

base actuator to cool.

Page 2-8

Printe d in U.S .A.

Page 23

Problem Symptom Probable Cause Check Correction

TABLE UP and TABLE DOWN functions do not work. All other functions work. - Continued

FOOT UP and FOOT DOWN functions do not work. All other functions work.

Table 2-1. Troubleshooting Guide - Continued

When TABLE UP and TABLE DOWN buttons are pressed, the table will not move (all other functions work). - Continued

When FOOT UP and FOOT DOWN buttons are pressed, the table will not move (all other functions work).

TESTING AND TROUBLESHOOTING

5 amp BRAKE/ BASE fuse for TABLE UP, TABLE DOWN, and base brake functions is blown.

Wire connections loose. Check all wiring connec-

Base actuator assembly is malfunctioning.

PC control board is malfunctioning.

Brake on base actuator is malfunctioning.

Foot capacitor is weak or blown.

Thermal overload switch in foot actuator is activated.

5 amp FOOT fuse for FOOT UP and FOOT DOWN functions is blown.

Wire connections loose. Check all wiring connec-

Foot actuator assembly is malfunctioning.

Refer to Figure 2-2 for this check. Perform continuity check on 5 amp BRAKE/BASE fuse.

tions to base actuator assembly and base brake solenoid.

Replace suspect base actuator assembly with known working base actuator assembly.

Refer to Figure 2-2 for this check. Press TABLE UP and then TABLE DOWN button while observing the PC control board. The TABLE UP L.E.D. and BRAKE/BASE L.E.D. should illuminate when the TABLE UP button is pressed and the TABLE DOWN L.E.D. and the BRAKE/BASE L.E.D. should illuminate when the TABLE DOWN button is pressed. If not, the PC control board is malfunctioning.

_ Replace base actuator. Refer

Replace suspect foot capacitor with known working foot capacitor.

_ Wait 10 to 20 minutes to allow

Refer to Figure 2-2 for this check. Perform continuity check on 5 amp FOOT fuse.

tions to foot actuator assembly.

Replace suspect foot actuator assembly with known working foot actuator assembly.

SECTION II

Replace blown fuse(s). Refer to para 5.2.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace base actuator assembly. Refer to para 4.11.

Replace PC control board. Refer to para 4.3 or 4.4.

to para 4.11.

Replace foot capacitor. Refer to para 4.10.

foot actuator motor to cool.

Replace blown fuse(s). Refer to para 5.2.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace actuator motor or foot actuator assembly. Refer to para 4.14 or 4.9.

Page 2-9

Printe d in U.S .A.

Page 24

Problem Symptom Probable Cause Check Correction

FOOT UP and FOOT DOWN functions do not work. All other functions work. - Continued

BACK UP function works, but BACK DOWN function does not or BACK DOWN function works, but BACK UP function does not. All other functions work.

TILT UP function works but TILT DOWN function does not or TILT DOWN function works, but TILT UP function does not. A ll other functions work.

Table 2-1. Troubleshooting Guide - Continued

When FOOT UP and FOOT DOWN buttons are pressed, the table will not move (all other functions work). - Continued

One function operates properly, but the other does not.

TESTING AND TROUBLESHOOTING

PC control board is malfunctioning.

Wire connections loose. Check all wiring connec-

Back actuator assembly is malfunctioning.

PC control board is malfunctioning (relay for up or down function is malfunctioning).

Hand control switch panel of hand control is malfunctioning (switch membrane is malfunctioning).

BACK UP or BACK DOWN footswitch is malfunctioning.

Wire connections loose. Check all wiring connec-

Tilt actuator assembly is malfunctioning.

Refer to Figure 2-2 for this check. Press FOOT UP and then FOOT DOWN button while observing the PC control board. The FOOT UP L.E.D. should illuminate when the FOOT UP button is pressed and the FOOT DOWN L.E.D. should illuminate when the FOOT DOWN button is pressed. If not, the PC control board is malfunctioning.

tions to back actuator assembly.

Replace suspect back actuator assembly with known working back actuator assembly.

Replace suspect hand control switch panel with known working hand control switch panel.

Perform a continuity check on suspect foot switch.

tions to tilt actuator assembly.

Replace suspect tilt actuator assembly with known working tilt actuator assembly.

SECTION II

Replace PC control board. Refer to para 4.3 or 4.4.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace actuator motor or back actuator assembly. Refer to para 4.14 or 4.7.

Replace PC control board. Refer to para 4.3 or 4.4.

Replace hand control switch panel. Refer to para 4.20.

Replace footswitch. Refer to para 4.25.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace actuator motor or tilt actuator assembly. Refer to para 4.14 or 4.5.

Page 2-10

Printe d in U.S .A.

Page 25

Problem Symptom Probable Cause Check Correction

TILT UP function works but TILT DOWN function does not or TILT DOWN function works, but TILT UP function does not. All other functions work.

- Continued

TABLE UP function works, but TABLE DOWN function does not or TABLE DOWN function works, but TABLE UP function does not. All other functions work.

Table 2-1. Troubleshooting Guide - Continued

One function operates properly, but the other does not. - Continued

One function operates properly, but the other does not.

TESTING AND TROUBLESHOOTING

PC control board is malfunctioning (relay for up or down function is malfunctioning).

Hand control switch panel of hand control is malfunctioning (switch membrane is malfunctioning).

TILT UP or TILT DOWN footswitch is malfunctioning.

Wire connections loose. Check all wiring connec-

Either base down limit switch or base up limit switch is malfunctioning.

Base actuator assembly is malfunctioning.

PC control board is malfunctioning (relay for up or down function is malfunctioning).

Hand control switch panel of hand control is malfunctioning (switch membrane is malfunctioning).

Replace suspect hand control switch panel with known working hand control switch panel.

Perform a continuity check on suspect footswitch.

tions to base actuator.

Perform continuity check on N.C. limit switches (limit switch tripped = open).

Replace suspect base actuator assembly with known working base actuator assembly.

Replace suspect hand control switch panel with known working hand control panel.

SECTION II

Replace PC control board. Refer to para 4.3 or 4.4.

Replace hand control switch panel. Refer to para 4.20.

Replace footswitch. Refer to para 4.25.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace base up limit switch (Refer to para 4.16) or base down limit switch (Refer to para 4.15).

Replace base actuator assembly. Refer to para 4.11.

Replace PC control board. Refer to para 4.3 or 4.4.

Replace hand control switch panel. Refer to para 4.20.

Page 2-11

Printe d in U.S .A.

Page 26

Problem Symptom Probable Cause Check Correction

TABLE UP function works, but TABLE DOWN function does not or TABLE DOWN function works, but TABLE UP function does not. All other functions work. - Continued

FOOT UP function works, but FOOT DOWN function does not or FOOT DOWN function works, but FOOT UP function does not. All other functions work.

TA B L E D OW N, FO OT DOWN, AND TILT DOWN functions do not work. All other functions work.

Table 2-1. Troubleshooting Guide - Continued

One function operates properly, but the other does not. - Continued

One function operates properly, but the other does not.

When TABLE DOWN, FOOT DOWN, or TILT DOWN buttons are pressed, the table will not move (all other functions work). Foot Extension lam p on hand control illuminates.

TESTING AND TROUBLESHOOTING

TABLE UP or TABLE DOWN footswitch is malfunctioning.

Wire connections loose. Check all wiring connec-

Foot actuator assembly is malfunctioning.

PC control board is malfunctioning (relay for up or down function is malfunctioning).

Hand control switch panel of hand control is malfunctioning (switch membrane is malfunctioning).

FOOT UP or FOOT DOWN footswitch is malfunctioning.

Foot rest extension is not pushed in all the way.

Foot rest extension limit switch, foot actuator limit switch, and/or base actuator limit switch malfunctioning.

PC control board is malfunctioning.

Perform a continuity check on suspect footswitch.

tions to foot actuator assembly.

Replace suspect foot actuator assembly with known working foot actuator assembly.

Replace suspect hand control switch panel with known working hand control switch panel.

Perform a continuity check on suspect footswitch.

Check that foot rest extension is pushed in all the way.

Perform continuity check on limit switches.

Replace suspect PC board with known working PC board.

SECTION II

Replace footswitch. Refer to para 4.25.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace actuator motor or foot actuator assembly. Refer to para 4.14 or 4.9.

Replace PC control board. Refer to para 4.3 or 4.4.

Replace hand control switch panel. Refer to para 4.20.

Replace footswitch. Refer to para 4.25.

Push foot rest extension in all the way.

Replace limit switch(es). Refer to para 4.31, 4.32, or 4.33.

Replace PC board. Refer to para 4.3 or 4.4.

Page 2-12

Printe d in U.S .A.

Page 27

Problem Symptom Probable Cause Check Correction

The Back, Tilt, or Foot function drifts by itself.

Base function drifts by itself.

Table moves fine for light patient, but will not move or moves slowly for very heavy patient.

Whirling or squeaking noise is heard when an actuator assembly is being run.

Excessive sideways play of table top.

Excessive sideways play of back section.

Armrest is not operating properly.

Headrest is not operating properly.

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Function operates properly otherwise.

Base function operates properly otherwise.

Heavy patients cause table to malfunction.

Noisy actuator. Foreign matter on ball screw

Table is not stable and can be moved from side to side.

Back section feels loose and can be moved from side to side.

Armrest does not lock into one of its two positions.

Headrest assembly slides downward on its own or moves out of position too easily.

Headrest assembly takes excessive force to position.

Headrest joints move even though headlock release button has not been depressed.

Actuator is malfunctioning. Replace suspect actuator

Base brake is malfunctioning.

Low voltage is being supplied to table.

Table overloaded with too heavy of a patient.

Capacitor for suspect function is weak.

threads and / or lack of lubricant.

Eccentric bearing(s) not tight or chain assemblies are loose.

Base slide assembly is worn or deformed.

Table base is not resting firmly on floor.

Back slide bearing(s) worn or missing.

Armrest release knob is not returning due to dir t buildup, weak spring, or damaged components.

Headrest slide mechanism needs adjusted (tightened).

Headrest slide mechanism needs adjusted (loosened).

Stop pins in headrest joints not creating a positive lock due to weak spring, dir t, or wear of components.

assembly with known working actuator assembly.

Replace suspect base actuator with known working base actuator.

Check voltage at wall receptacle - should be:

Applies to 419 (-003 &

-004) only:

115 ±10% VAC

Applies to 419 (-005 &

-006) only:

230 ±10% VAC

Maximum weight capacity of table is 325 lbs (147.4 kg).

Replace suspect capacitor with known working capacitor.

Che ck fo r forei gn mat ter on ball screw threads. Check for lack of lubricant on ball screw threads.

Check for loose eccentric bearing(s) and check tension of chain assemblies.

Check condition of base slide assembly.

Check to verify all four leveling screws are contacting the floor.

Replace back slide bearing(s).

Check for dirt in mechanism. Check for weak spring or damaged components.

Check adjustment of headrest slide mechanism.

Check for weak springs or dirt. Also check for worn components such as a mushroomed stop pin or pin stop block.

SECTION II

Replace actuator assembly. Refer to para 4.5, 4.7, 4.9, or

4.11..

Replace base actuator. Refer to para 4.11.

Correct low voltage situation at wall receptacle.

Inform table operator of weight limitation.

Replace capacitor.

Clean all foreign matter off of ball screw threads. Coat ball screw threads with STP treatment oil or equivalent. If actuator assembly is still noisy, replace it.

Adjust eccentric bearing(s) or adjust tension of chain assembly. Refer to para 4.17.

Replace base slide assembly. Refer to para 18.

Adjust the leveling screws; there is one located under each corner of the base.

Replace back slide bearing(s). Refer to para 4.30.

Clean mechanism. If necessary, replace weak spring, or damaged components. Refer to para 4.29.

Adjust headrest slide mechanism. Refer to para 4.28.

Clean headrest components. Replace any worn or damaged componets. Lubricate components with a silicone based lubricant. Refer to para 4.27.

Page 2-13

Printe d in U.S .A.

Page 28

Problem Symptom Probable Cause Check Correction

The Troublesh ooting Guide entries below appl y only to the programmable tables (419-004 and 419-006)

HOME POSITION function does not operate properly. All other functions work.

Table cannot be programmed or moved to previously programmed position.

Table 2-1. Troubleshooting Guide - Continued

Nothing happens when the HOME POSITION button is pressed.

When HOME POSITION button is pressed, the base actuator continues to run/ hum when the table top is completely lowered (for approximately another 7 10 seconds).

When operator attempts to store a position into the PC control board’s memory, it is not successful.

TESTING AND TROUBLESHOOTING

Hand control switch panel of hand control is malfunctioning (switch membrane is malfunctioning).

HOME POSITION footswitch is malfunctioning.

Base down limit switch is tripped.

Base down limit switch is malfunctioning - stuck closed.

Base actuator is running so slow that the minimum table top height is not reached before the 18 second time limit stops the base actuator.

Base down limit switch is malfunctioning (stuck closed).

Base down limit switch is out of adjustment.

Incorrect steps taken for entry of position.

Hand control switch panel of hand control is malfunctioning (a switch membrane is malfunctioning).

Pos iti on “1”, “2”, “3”, “4”, or PROGRAM footswitch is malfunctioning.

PC control board cannot read a position sensor correctly, resulting in an error code.

PC control board is malfunctioning.

PC control board needs calibrated.

Replace suspect hand control switch panel with known working hand control switch panel.

Perform continuity check on HOME POSITION footswitch.

Table top is already lowered all the way down, tripping limit switch.

Perform continuity check on base down limit switch (limit switch is N.C. when not tripped).

Replace the base actuator and / or base capacitor with known working components.

Perform continuity check on N.C. base down limit switch (tripped = open).

Check adjustment of base down limit switch.

Refer to the Operator’s manual for proper procedure.

Replace suspect hand control switch panel with known working hand control switch panel.

Perform continuity check on suspect footswitch.

Unplug table for at least ten seconds, plug table back in, and then look for presence of error codes.

Replace suspect PC control board with known working PC control board.

_ Perform calibration of PC con-

SECTION II

Replace hand control switch panel. Refer to para 4.20.

Replace footswitch. Refer to para 4.25.

Inform operator of minimum height of table.

Replace base down limit switch. Refer to para 4.15.

Replace base capacitor. Refer to para 4.12. If this does not correct the problem, replace the base actuator. Refer to para 4.11.

Replace base down limit switch. Refer to para 4.15. Because the base actuator does not freewheel, it may have been damaged. Check and replace if necessary. Refer to para 4.11.

Adjust base down limit switch. Refer to para 4.15.

Refer the operator to the Operator’s manual for proper procedure.

Replace hand control switch panel. Refer to para 4.20.

Replace footswitch. Refer to para 4.25.

If error codes are displayed on hand control, use error code chart in Table 5-2 to determine cause of error or see below in this Troubleshooting Guide.

Replace PC control board. Refer to para 4.3 or 4.4.

trol board. Refer to para 4.2.

Page 2-14

Printe d in U.S .A.

Page 29

Problem Symptom Probable Cause Check Correction

Table cannot be programmed or moved to previously programmed position. - Continued

Table 2-1. Troubleshooting Guide - Continued

Table does not move to its correct programmed position when Position “1”, “2”, “3”, or “4” button is pressed.

Table moves toward the correct programmed position, but one of the functions stops short.

TESTING AND TROUBLESHOOTING

Foot rest extension is not pushed in all the way.

No position was programmed into the PC control board’s memory for that Position button.

The PC control board cannot read a position sensor correctly, resulting in an error code.

PC control board is malfunctioning.

Hand control switch panel of hand control is malfunctioning (a switch membrane is malfunctioning).

Pos iti on “1”, “2”, “3”, or “4” footswitch is malfunctioning.

Foot Section Crash Protection Circuit limit switch(es) malfunctioning.

The position sensor for the suspect function is out of adjustment; the position sensor travels past its limit and enters a “dead spot” (a dead spot is where the voltage output of the sensor does not change even when its associated function is moving).

Foot Extension Protection Circuit limit switch(es) malfunctioning.

Check if the Foot Rest Extension lamp is flashing; will flash as long as a Position button remains pressed and foot extension is not stowed.

Check if the PROGRAM MODE lamp is flashing; it will flash when a Program Position button is pressed which does not have a valid table position stored into its memory.

Unplug table, plug table back in, and then observe hand control for presence of error codes.

Replace suspect PC control board with known working PC control board.

Replace suspect hand control switch panel with known working hand control switch panel.

Perform continuity check on suspect footswitch.

Check continuity of Foot Section Crash Protection Circuit limit switches.

Run the function to one of its limits and connect a multimeter to the Test Points for the suspect position sensor (Refer to para 4.37, 4.38, 4.39, or

4.40). Then, press a button for 1/10 second and observe multimeter reading to see if it has changed. If it hasn’t, the position sensor is in a dead spot and must be readjusted. Repeat for functions other limit.

Check continuity of Foot Extension Protection Circuit limit switches.

SECTION II

Push foot extension in all the way.

Inform the operator of the proper procedure for programming a table top position into memory for a Position button.

If error codes are displayed on hand control, use error code chart in Table 5-2 to determine cause of error.

Replace PC control board. Refer to para 4.3 or 4.4.

Replace hand control switch panel. Refer to para 4.20.

Replace footswitch. Refer to para 4.25.

Replace limit switch(es). Refer to para 4.31, 4.32, and/or

4.33.

Adjust the position sensor for the suspect function. If the adjustment is not successful, replace the position sensor. Refer to para 4.37, 4.38, 4.39, and/or 4.40.

Replace limit switch(es). Refer to para 4.31, 4.32, and/or

4.33.

Page 2-15

Printe d in U.S .A.

Page 30

Problem Symptom Probable Cause Check Correction

When Programmed Position button “1”, “2”, “3”, or “4” is pressed, nothing happens. All other functions work properly.

Table 2-1. Troubleshooting Guide - Continued

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 11

ibration not completed due to error condition) is displayed on foot/hand control. See Table 5-2 for explanation of error codes and how to read them.

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 12

received from foot/hand) is displayed on foot control. See Table 5-2 for explanation of error codes and how to read them.

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 21

tion sensor output voltage did not change when expected during a position recall) is displayed on foot/ hand control. See Table 52 for explanation of error codes and how to read them.

(system cal-

(invalid data

(base posi-

TESTING AND TROUBLESHOOTING

The PC control board has detected an error condition such as Foot Section Crash Protection Circuit is open, STOP button was pressed, etc., which has prevented the system calibration routine from completing successfully.

The PC control board has detected a problem with the foot/hand control.

PC control board is malfunctioning.

Base position sensor is out of adjustment or bolt head to which position sensor is attached is loose and is not rotating properly.

Base position sensor is malfunctioning.

Base reducer assembly is malfunctioning.

Wiring connections are dirty, torn, or loose.

_ Perform a new system calibra-

Check the foot control interface board and hand control PC board.

Replace PC control board with known working PC control board.

Check to see if base position sensor is adjusted correctly or if bolt is loose.

Replace base position sensor with known working base position sensor.

Check to see if the base reducer assembly is set up and operating properly.

Check all wiring connections from base position sensor and PC control board.

SECTION II

tion. Refer to para 4.2.

Replace foot control PC board (Refer to para 4.23) or hand control PC board (Refer to para 4.20).

Replace PC control board. Refer to para 4.3 or 4.4.

Adjust the base position sensor. Refer to para 4.40.

Replace base position sensor. Refer to para 4.40.

Repair the base reducer assembly. Refer to para 4.40.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Rev. 2/00

Page 2-16

Printe d in U.S .A.

Page 31

Problem Symptom Probable Cause Check Correction

When Programmed Position button “1”, “2”, “3”, or “4” is pressed, nothing happens. All other functions work properly.

- Continued

Table 2-1. Troubleshooting Guide - Continued

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 22

tion sensor output voltage did not increase or decrease as expected during system calibration or position recall) is displayed on foot/hand control. See Table 5-2 for explanation of error codes and how to read them.

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 23

position not stored due to A/D conversion error reading base position sensor) is displayed on foot/hand control. See Table 5-2 for explanation of error codes and how to read them.

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 24

sensor output voltage did not change when expected during a position recall) is displayed on foot/hand control. See Table 5-2 for explanation of error codes and how to read them.

(base posi-

(program

(tilt position

TESTING AND TROUBLESHOOTING

Base position sensor is out of adjustment or bolt head to which position sensor is attached is loose and is not rotating properly.

Base reducer assembly is malfunctioning.

Base position sensor is malfunctioning.

Wiring connections are dirty, torn, or loose.

The PC control board is malfunctioning.

Tilt position sensor is out of adjustment or bolt head to which position sensor is attached is loose and is not rotating properly.

Tilt position sensor is malfunctioning.

Wiring connections are dirty, torn, or loose.

Check to see if base position sensor is adjusted correctly or if bolt is loose.

Check to see if the base reducer assembly is set up and operating properly.

Replace base position sensor with known working base position sensor.

Check all wiring connections from base position sensor and PC control board.

Replace PC control board with known working PC control board.

Check to see if tilt position sensor is adjusted correctly or if bolt is loose.

Replace tilt position sensor with known working tilt position sensor.

Check all wiring connections from tilt position sensor and PC control board.

SECTION II

Adjust the base position sensor. Refer to para 4.40.

Repair the base reducer assembly. Refer to para 4.40.

Replace base position sensor. Refer to para 4.40.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace PC control board. Refer to para 4.3 or 4.4.

Adjust the tilt position sensor. Refer to para 4.38.

Replace tilt position sensor. Refer to para 4.38.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Rev. 2/00

Page 2-17

Printe d in U.S .A.

Page 32

Problem Symptom Probable Cause Check Correction

When Programmed Position button “1”, “2”, “3”, or “4” is pressed, nothing happens. All other functions work properly.

- Continued

Table 2-1. Troubleshooting Guide - Continued

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 25

sensor output voltage did not increase or decrease as expected during system calibration or position recall) is displayed on foot/ hand control. See Table 51 for explanation of error codes and how to read them.

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 26

position not stored due to A/D conversion error reading tilt position sensor) is displayed on foot/hand control. See Table 5-1 for explanation of error codes and how to read them.

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 31

tion sensor output voltage did not change when expected during a position recall) is displayed on foot/ hand control. See Table 51 for explanation of error codes and how to read them.

(tilt position

(program

(back posi-

TESTING AND TROUBLESHOOTING

Tilt position sensor is out of adjustment or bolt head to which position sensor is attached is loose and is not rotating properly.

Tilt position sensor is malfunctioning.

Wiring connections are dirty, torn, or loose.

The PC control board is malfunctioning.

Back position sensor is out of adjustment or bolt head to which position sensor is attached is loose and is not rotating properly.

Back position sensor is malfunctioning.

Wiring connections are dirty, torn, or loose.

Check to see if tilt position sensor is adjusted correctly or if bolt is loose.

Replace tilt position sensor with known working tilt position sensor.

Check all wiring connections from tilt position sensor and PC control board.

Replace PC control board with known working PC control board.

Check to see if back position sensor is adjusted correctly or if bolt is loose.

Replace back position sensor with known working back position sensor.

Check all wiring connections from back position sensor and PC control board.

SECTION II

Adjust the tilt position sensor. Refer to para 4.38.

Replace tilt position sensor. Refer to para 4.38.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace PC control board. Refer to para 4.3 or 4.4.

Adjust the back position sensor. Refer to para 4.39.

Replace back position sensor. Refer to para 4.39.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Rev. 2/00

Page 2-18

Printe d in U.S .A.

Page 33

Problem Symptom Probable Cause Check Correction

When Programmed Position button “1”, “2”, “3”, or “4” is pressed, nothing happens. All other functions work properly.

- Continued

Table 2-1. Troubleshooting Guide - Continued

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 32

tion sensor output voltage did not increase or decrease as expected during system calibration or position recall) is displayed on foot/hand control. See Table 5-1 for explanation of error codes and how to read them.

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 33

position not stored due to A/D conversion error reading tilt position sensor) is displayed on foot/hand control. See Table 5-1 for explanation of error codes and how to read them.

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 34

tion sensor output voltage did not change when expected during a position recall) is displayed on foot/ hand control. See Table 51 for explanation of error codes and how to read them.

(back posi-

(program

(foot posi-

TESTING AND TROUBLESHOOTING

Back position sensor is out of adjustment or bolt head to which position sensor is attached is loose and is not rotating properly.

Back position sensor is malfunctioning.

Wiring connections are dirty, torn, or loose.

The PC control board is malfunctioning.

Foot position sensor is out of adjustment or bolt head to which position sensor is attached is loose and is not rotating properly.

Foot position sensor is malfunctioning.

Wiring connections are dirty, torn, or loose.

Check to see if back position sensor is adjusted correctly or if bolt is loose.

Replace back position sensor with known working back position sensor.

Check all wiring connections from back position sensor and PC control board.

Replace PC control board with known working PC control board.

Check to see if foot position sensor is adjusted correctly or if bolt is loose.

Replace foot position sensor with known working foot position sensor.

Check all wiring connections from foot position sensor and PC control board.

SECTION II

Adjust the back position sensor. Refer to para 4.39.

Replace back position sensor. Refer to para 4.39.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace PC control board. Refer to para 4.3 or 4.4.

Adjust the foot position sensor. Refer to para 4.37.

Replace foot position sensor. Refer to para 4.37.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Rev. 2/00

Page 2-19

Printe d in U.S .A.

Page 34

Problem Symptom Probable Cause Check Correction

When Programmed Position button “1”, “2”, “3”, or “4” is pressed, nothing happens. All other functions work properly.

- Continued

STOP function does not operate properly. All other functions work.

Table 2-1. Troubleshooting Guide - Continued

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 35

When table is unplugged (for at least ten seconds) and then plugged back in,

error code 36

position not stored due to A/D conversion error reading foot position sensor) is displayed on foot/hand control. See Table 5-1 for explanation of error codes and how to read them.

Function does not stop when the STOP button is pressed.

(foot posi-

(program

TESTING AND TROUBLESHOOTING

Foot position sensor is out of adjustment or bolt head to which position sensor is attached is loose and is not rotating properly.

Foot position sensor is malfunctioning.

Wiring connections are dirty, torn, or loose.

The PC control board is malfunctioning.

Hand control switch panel of hand control is malfunctioning (switch membrane is malfunctioning).

STOP footswitch is malfunctioning.

Check to see if foot position sensor is adjusted correctly or if bolt is loose.

Replace foot position sensor with known working foot position sensor.

Check all wiring connections from foot position sensor and PC control board.

Replace PC control board with known working PC control board.

Replace suspect hand control switch panel with known working hand control switch panel.

Perform continuity check on STOP footswitch.

SECTION II

Adjust the foot position sensor. Refer to para 4.37.

Replace foot position sensor. Refer to para 4.37.

Clean any dirty connections. Tighten any loose connections. Replace any damaged connections.

Replace PC control board. Refer to para 4.3 or 4.4.

Replace hand control switch panel. Refer to para 4.20.

Replace footswitch. Refer to para 4.25.

Rev. 2/00

Page 2-20

Printe d in U.S .A.

Page 35

PROGRAMMABLE PC CONTROL BOARD - 115/230 VAC

PRIMARY

FUSES

TILT

DOWN

L.E.D.

TILT

FUSE

SECTION II

TESTING AND TROUBLESHOOTING

TILT

L.E.D.

BACK

DOWN

L.E.D.

BACK

L.E.D.

FOOT

L.E.D.

FOOT

DOWN

L.E.D.

FOOT FUSE

BRAKE/BASE

FUSE

NON-PROGRAMMABLE PC CONTROL BOARD - 115/230 VAC

PRIMARY

FUSE

TILT

DOWN

L.E.D.

TILT

L.E.D.

BRAKE

L.E.D.

BASE

DOWN

L.E.D.

BASE

L.E.D.

BACK

FUSE

BASE

L.E.D.

BASE

DOWN

L.E.D.

TILT

FUSE

BACK

DOWN

L.E.D.

Figure 2-2. Fuse and Troubleshooting L.E.D. Location

*On some early units, the Foot Up and Foot Down relays are labeled incorrectly on the PC board (Foot Up relay labeled Foot Down / Foot Down relay labeled Foot Up). On later units the Foot Up/Down relays are identified by an adhesive label.

Rev. 12/99

BACK

L.E.D.

BACK

FUSE

FOOT

FUSE

Page 2-21

FOOT

L.E.D.

FOOT DOWN L.E.D.

BRAKE/BASE

FUSE

BRAKE/BASE

L.E.D.

MA503400

Printe d in U.S .A.

Page 36

SECTION II TESTING AND TROUBLESHOOTING

Page 2-22

Printe d in U.S .A.

Page 37

SCHEDULED MAINTENANCE

SECTION III

SCHEDULED MAINTENANCE

SECTION III

3.1 Scheduled Maintenance

periodically on the 419 Power Procedure Table. These inspections and services should be performed as often

Table 3-1 is a Scheduled Maintenance Chart which lists

as indicated in the chart.

the inspections and services that should be performed

Table 3-1. Scheduled Maintenance Chart

Interval Inspection or Service What to Do

Semi-annually Obvious damage Visually check condition of table for obvious damage such as: cracks in components, missing com-

Fasteners / hardware Check table for missing or loose fasteners / hardware. Replace any missing hardware and tighten

Warning and instructional decals

Pivot points / moving parts / accessories

Foot control Check that foot control works correctly. Make sure all footswitches operate properly. Replace any

Hand control (optional) Check that hand control works correctly. Make sure all switch membranes work correctly. If neces-

Ball screws of actuator assemblies

Drifting of actuator assemblies

Base actuator limit switches

Foot rest extension Check that foot extension can be easily extended. Make sure foot rest extension is latched securely

Foot Extension Protection Circuit

Excessive play in column assembly

Headrest Assembly Check that headrest slide assembly can be positioned while having adequate friction to hold head-

ponents, dents in components, or any other visible damage which would cause the table to be unsafe to operate or would compromise its performance. Repair table as necessary.

any loose hardware as necessary.

Check for missing or illegible decals (see parts illustrations for decal locations and descriptions). Replace decals as necessary.

Lubricate all exposed pivot points, moving parts, and accessories with silicone based lubricant.

malfunctioning footswitches. Refer to para. 4.24 or 4.25.

sary, replace hand control switch panel. Refer to para 4.20.

Extend each actuator assembly and wipe ball screw threads down with a rag to remove foreign matter. Coat as much of the ball screw threads as possible with STP treatment oil or equivalent. Run each actuator assembly to both ends of its travel a couple of times to spread the oil evenly over all of the ball screw threads and then remove excess oil. If oil does not correct a squealing actuator assembly, replace actuator assembly.

Check each actuator assembly for drift. If drifting occurs, replace actuator assembly.

Check that the base up limit switch and the base down limit switch stop the base actuator before it reaches its up or down limit; the base actuator does not freewheel and can be damaged if it reaches a limit. Adjust the limit switches if necessary. Refer to para 4.33.

in place when retracted.

Raise the BASE, FOOT, and TILT sections to their maximum height; then pull foot extension out as far as it will go. Lower FOOT section approximately 1/2 way down, then depress BASE DOWN button on hand control. Base should lower approximately 1/2 way down then stop, and Foot Rest Extension lamp should flash. BASE DOWN, FOOT DOWN, and TILT DOWN functions should be inoperable, all other functions should work properly. If necessary, adjust or replace limit switches. Refer to para 4.31, 4.32, or 4.33.

Check that column assembly does not have excessive side to side play. If necessary, adjust eccentric bearings or tighten chain. Refer to para 4.18.

rest assembly in place. If necessary, adjust friction setting of headrest slide assembly. Refer to para 4.28.

Rev. 2/02

Dbl Articulating: Check that headrest release button works properly and that headrest assembly locks securely in place at both pivot points. Replace headrest components as necessary. Refer to para 4.27.

Triple Articulating: Check that headrest is adjusted properly. Place 45 lbs (20.4 kg) of static weight on headrest. Headrest should not drift down. Adjust headrest if necessay. Refer to para

4.xx.

Page 38

SECTION III SCHEDULED MAINTENANCE

Table 3-1. Scheduled Maintenance Chart

Interval Inspection or Service What to Do

Semi-annually Arm Rests Pull release knob and check that arm rests can be positioned easily and lock securely into two posi-

Upholstery Check all upholstery for rips, tears, or excessive wear. Replace cushions as necessary.

Accessories Check that all accessories have all of their components and that they function properly. If neces-

Operational Test Perform an Operational Test to determine if the table is operating within its specifications (Refer to

tions when knob is released. Replace arm rest components as necessary. Refer to para 4.29.

sary, repair or replace the accessory.

para 2.1). Replace or adjust any malfunctioning components.

Page 3-2

Printe d in U.S .A.

Page 39

SECTION IV

MAINTENANCE / SERVICE INSTRUCTIONS

4.1 Introduction

WARNING

Refer to the Operator Manual for com-

plete instructions on operating the table. Failure to do so could result in personal injury .

NOTE

Perform an operational test on the table after the repair is completed to confirm the repair was properly made and that all malfunctions were repaired.

SECTION IV

MAINTENANCE / SERVICE

The following paragraphs contain removal, installation, repair, and adjustment procedures for the table.

4.2 PC Control Board Calibration (Programmable Tables Only)

A. Clearing PC Control Board Error Code Memory.

NOTE

Be sure to record error code prior to performing clearing procedure. If necessary, refer to Section 5 - para

5.3.

(1) Unplug table power cord from outlet receptacle

for at least ten seconds.

(2) Depress and hold the PROGRAM button (1,

Figure 4-1) while simultaneously plugging the table power cord into the outlet receptacle.

Observe.

the FOOT REST EXTENSION lamp (3) will simultaneously illuminate for approximately 5 seconds and then go out.

(3) After the PROGRAM MODE lamp (2) and the

FOOT REST EXTENSION lamp (3) go out, release the PROGRAM button (1).

Observe.

onds, the PC control board will sound two beeps, indicating the error codes were successfully cleared from memory. If the two beeps do not sound, repeat the entire procedure

The PROGRAM MODE lamp (2) and

After approximately 10 to 20 sec-

MIDMARK

Figure 4-1. Clearing PC Control Board Memory

B. Calibrating PC Control Board.

(1) Unplug table power cord from outlet receptacle

for at least ten seconds.

(2) Depress and hold the Position “1” button on

foot/hand control (see Figure 4-2) while simultaneously plugging the table power cord into the outlet receptacle.

Observe.

ure 4-2) and the FOOT REST EXTENSION lamp (2) will illuminate for approximately three seconds and will then go out.

The PROGRAM MODE lamp (1, Fig-

NOTE

When performing the following step, release the Position “1” button within three seconds after the PROGRAM MODE and FOOT REST EXTENSION lamps go out. Failure to do so will cause the calibration to fail.

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SECTION IV MAINTENANCE / SERVICE

(3) After the PROGRAM MODE lamp (1) and the

FOOT REST EXTENSION lamp (2) go out, release Position “1” button.

NOTE

If performing calibration procedure using hand control, it is not necessary to press the DOWN button in the following step.

(4) Within 5 seconds, press and release the HOME

position button (3) then immediately press and hold the DOWN pedal (4).

POSITION

Observe. The PROGRAM MODE lamp (1) and

FOOT REST EXTENSION lamp (2) will illuminate for three seconds and then go out.

(5) After the PROGRAM MODE lamp (1) and the

FOOT REST EXTENSION lamp (2) go out, release DOWN button (4).

While table top moves through its calibration routine, apply a steady downward pressure on the back section to prevent it from “bouncing” which can cause the calibration to fail.

Observe. The table top will automatically begin

to move; all functions will be run to their limits in the following order: Table Up, Foot Down, Foot Up, Tilt Up, Tilt Down, Back Down, Back Up, and Table Down. When the TABLE DOWN function is completely lowered, the calibration routine is complete. Also, the PC control board will sound a beep every two seconds, indicating a calibration routine is in progress.

(6) Check the foot/hand control; if the PROGRAM

MODE lamp (1) and FOOT REST EXTENSION lamp (2) begin to flash, an error condition occurred which resulted in an unsuccessful calibration; repeat the entire procedure. If the PROGRAM MODE lamp and FOOT REST EXTENSION lamp do not begin to flash, the calibration was successful.

MIDMARK

Figure 4-2. PC Control Board Calibration

4.3 PC Control Board Removal / Installation (Non-Programmable Tables Only)

A. Removal

WARNING

Always disconnect the power cor d fr om

the outlet receptacle before removing any of the table’s covers/shrouds or making any repairs to prevent the possibility of electrical shock. Failure to comply with these instructions could result in severe personal injury or death.

(1) Unplug table power cord from outlet receptacle.

(2) Remove two screws (1, Figure 4-3) and PC

board cover (2) from base casting (3).

Rev. 12/01

(3) Tag and disconnect eight wire harnesses (4)

from PC control board (5).

(4) Tag and disconnect two modular cords (6) from

PC control board (5).

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Figure 4-3. PC Control Board Removal / Installation

(Non-program m able tables only)

SECTION IV

MAINTENANCE / SERVICE

4.4 PC Control Board Removal / Installation (Programmable Tables Only)

A. Removal

WARNING

Always disconnect the power cord from

the outlet receptacle before removing any of the table's covers/shrouds or making any repairs to prevent the possibility of electrical shock. Failure to comply with these instructions could result in severe personal injury or death.

(1) Unplug table power cord from outlet receptacle.

(2) Remove two screws (1, Figure 4-4) and PC

board cover (2) from base casting (3).

(3) Tag and disconnect ten wire harnesses (4) from

PC control board (5).

(4) Tag and disconnect two modular cords (6) from

PC control board (5).

(5) Loosen terminal screws (7); then tag and dis-

connect wires (8) from terminals of PC control board (5).

(6) Remove six screws (9) and PC control

board (5) from base casting (3).

B. Installation

(1) Install PC control board (5) on base casting (3)

and secure with six screws (9).

(2) Connect wires (8) to terminals of PC control

board (5) and secure by tightening terminal screws (7). Make sure jumper strips (10) are installed.

(3) Connect two modular cords (6) to PC control

board (5).

(4) Connect eight wire harnesses (4) to PC control

board (5).

(5) Install PC board cover (2) on base casting (3)

and secure with two screws (1).

(6) Plug table power cord into outlet receptacle.

(5) Loosen terminal screws (7); then tag and dis-

connect wires (8) from terminals of PC control board (5).

(6) Remove six screws (9) and PC control

board (5) from base casting (3).

B. Installation

(1) Install PC control board (5) on base casting (3)

and secure with six screws (9).

(2) Connect wires (8) to terminals of PC control

board (5) and secure by tightening terminal screws (7). Make sure jumper strips (10) are installed.

(3) Connect two modular cords (6) to PC control

board (5).

(4) Connect ten wire harnesses (4) to PC control

board (5).

(5) Depress and hold the PROGRAM / FAULT

CLEAR button (11) while simultaneously plugging in the table power cord into the outlet receptacle.

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IDMARK

MA526600

MAINTENANCE / SERVICE

Observe.

onds, the PC control board will sound three beeps to indicate that the PC control board’s memory has been successfully erased.

(7) Install PC board cover (2) on base casting (3)

and secure with two screws (1).

(8) Calibrate the PC control board (Refer to

para 4.2).

After approximately 10 to 20 sec-

4.5 Tilt Actuator Removal / Installation

A. Removal

(1) Raise TABLE UP function all the way up.

WARNING

Always disconnect the power cord from

Figure 4-4. PC Control Board Removal / Installation

(Programmable Tables Only)

Observe.

and the FOOT REST EXTENSION lamp (13) will simultaneously illuminate for approximately three seconds and then go out.

(6) After the PROGRAM MODE lamp (12) and

the FOOT REST EXTENSION lamp (13) go out, release the PROGRAM / FAULT CLEAR button (11).

The PROGRAM MODE lamp (12)

(2) Unplug table power cord from outlet receptacle.

(3) Remove four screws (1, Figure 4-5) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(4) Lower middle outer shroud assembly (4) down

out of way.

(5) Remove screw (1, Figure 4-6), ground wire (2),

and lockwasher (3) from column adapter weldment (4).

(6) Cut two cable ties (A) securing actuator cable to

tilt actuator assembly (5).

(7) Remove two screws (6) and connection

cover (7) from column adapter weldment (4).

(8) Cut cable tie (B) securing wire harnesses to

capacitor mounting bracket (8).

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Figure 4-5. Shrouds Removal / Installation

(9) Disconnect actuator wire (9) from wire (10).

NOTE

Steps 10 thru 13 describe the procedure for 115 VAC units. Use these steps as a guide for 230 VAC units; the steps are similar.

(10) Using screwdriver, pry tab (C) of capacitor

mounting bracket (8) outward; then remove tilt capacitor (11) from capacitor mounting bracket.

(11) Remove cap (12) from tilt capacitor (11).

DANGER

A capacitor contains stored electricity.

Never touch terminals of a capacitor, even if power has been shut off or disconnected. Always discharge capacitor before touching capacitor terminals or wires. Failure to comply with these instruction could result in serious persona l injur y or de ath.

Figure 4-6. Tilt Actuator Wires

Disconnection / Connection

(12) Discharge tilt capacitor (11).

(13) Tag and disconnect two actuator wires (13)

from terminals of tilt capacitor (11); the yellow and orange wires do not need to be disconnected.

DANGER

Support foot end of table top while

removing clevis pin to prevent foot end of table top from falling and striking technician. Failure to comply with these instructions could result in serious personal injury.

(14) Remove two e-rings (1, Figure 4-7) and clevis

pin (2) securing base of tilt actuator (3) to column adapter weldment (4).

(15) Raise seat weldment (5) up far enough to get

access to pivot pin (6). Using a block (A), support seat weldment in this position.

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(16) Remove two e-rings (7) from pivot pin (6).

(17) Using a hammer and punch, drive pivot pin (6)

out of seat weldment (5) and remove tilt actuator (3) from table.

(18) Remove nut (8) and ground wire (9) from tilt

actuator (3).

B. Installation

(1) Install ground wire (9, Figure 4-7) on tilt actua-

tor (3) and secure with nut (8).

(2) Install tilt actuator (3) on column adapter weld-

ment (4) and secure with clevis pin (2) and two e-rings (1).

NOTE

Steps 3 thru 5 describe the procedure for 115 VAC units. Use these steps as a guide for 230 VAC units; the steps are similar.

(3) Connect two wires (13, Figure 4-6) to terminals

of tilt capacitor (11).

(4) Install cap (12) on tilt capacitor (11).

(5) Position bottom of tilt capacitor (11) on capaci-

tor mounting bracket (8) and then push the top of the capacitor inward. Using a screwdriver, force the tab (C) of the capacitor mounting bracket down over the catch (D) of the cap (12). Make sure tilt capacitor is held firmly in place.

(6) Connect actuator wire (9) to wire (10).

(7) Secure bundle of wire harnesses to capacitor

mounting bracket (8) with cable tie (B).

(8) Install connection cover (7) on column adapter

weldment (4) and secure with two screws (6).

(9) Secure actuator cable to tilt actuator (5) with

two cable ties (A).

(10) Install lockwasher (3), and ground wire (2) on

column adapter weldment (4) and secure with screw (1).

Figure 4-7. Tilt Actuator Removal / Installation

(11) Using spanner holes (B, Figure 4-7), unscrew

adjustable clevis (10) until it is even with top of actuator rod.

(12) Plug table power cord into outlet receptacle.

(13) Run TILT UP function to extend rod of tilt actua-

tor (3) 3 to 4 in. (7.6 to 10.2 cm).

(14) Remove support block (A); then temporarily

connect tilt actuator (3) to seat weldment (5) with clevis pin (6).

CAUTION

If tilt actuator does not free wheel at end of

stroke, seat weldment is hitting column adapter weldment. Do not allow this condition to exist: premature failure of tilt actuator will result.

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(15) Lower TILT DOWN function all the way down

(until tilt actuator can be heard free wheeling).

(16)

Observe.

Seat weldment (5) should be parallel with top of column weldment adapter (4). If seat weldment is parallel with top of column weldment adapter, go to step 21. If seat weldment is not parallel with top of column weldment adapter, go to step 17.

(17) Extend TILT UP function 3 to 4 in. (7.6 to

10.2 cm).

(18) Remove clevis pin (6) and block seat

weldment (5) in this position.

(19) Using spanner holes (B), screw adjustable cle-

vis (10) in or out as determined necessary in step 16.

(20) Repeat steps 16 thru 19 until seat weldment (5)

is parallel with top of column adapter weldment (4) when tilt actuator (3) is free wheeling at the end of its down stroke.

(21) Secure clevis pin (6) in place with two

e-rings (7).

(22) Install tabs (A, Figure 4-5) of R.H. and L.H.

outer shrouds (2) in slots (B) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (4) is captured by R.H. and L.H. outer shrouds (2).

4.6 Tilt Capacitor Removal / Installation

A. Removal

(1) Raise TABLE UP function all the way up.

WARNING

Always disconnect the power cord from

(2) Unplug table power cord from outlet receptacle.

(4) Lower middle outer shroud assembly (4) down

out of way.

(5) Remove two screws (5) and connection

cover (6) from column adapter weldment (3).

(6) Cut cable tie (A) securing wire harnesses to

capacitor mounting bracket (7).

(7) Using screwdriver, pry tab (B) of capacitor

mounting bracket (7) outward; then remove tilt capacitor (8) from capacitor mounting bracket.

NOTE

Steps 8 thru 10 describe the procedure for 115 VAC units. Use these steps as a guide for 230 VAC units; the steps are similar.

(8) Remove cap (9) from tilt capacitor (8).

DANGER

A capacitor contains stored electricity.

Never touch terminals of a capacitor, even if power has been shut off or disconnected. Always discharge capacitor before touching capacitor terminals or wires. Failure to comply with these instructions could result in serious persona l in jury or death.

(9) Discharge tilt capacitor (8).

(10) Tag and disconnect four wires (10) from termi-

nals of tilt capacitor (8); then remove tilt capacitor.

B. Installation

(1) Connect four wires (10) to terminals of tilt

capacitor (8).

(2) Install cap (9) on tilt capacitor (8).

(3) Position bottom of tilt capacitor (8) on capacitor

mounting bracket (7) and then push the top of the capacitor inward. Using a screwdriver, force the tab (B) of the capacitor mounting bracket down over the catch (C) of cap (9). Make sure tilt capacitor is held firmly in place.

(3) Remove four screws (1, Figure 4-8) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

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Page 4-7

(4) Secure bundle of wire harnesses to capacitor

mounting bracket (7) with cable tie (A).

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SECTION IV MAINTENANCE / SERVICE

(7) Plug table power cord into outlet receptacle.

4.7 Back Actuator Removal / Installation

A. Removal

(1) If possible, raise back section of table all the

way up.

WARNING

The back section of the table is very

heavy and will fall backward when clevis pin is removed. Use supports or an assistant to support back section when performing the following steps. Failure to comply with these instructions could result in serious personal injur y o r death.

(2) While supporting back section, remove

bolt (1, Figure 4-9), and clevis pin (2) securing back actuator (3) to back weldment (4).

Figure 4-8. Tilt Capacitor Removal / Installation

(5) Install connection cover (6) on column adapter

weldment (3) and secure with two screws (5).

(3) Measure and record distance (A); then remove

two set screws (5), and clevis (6) from back actuator (3).

(4) Using foot/hand control, retract back actuator

as far as it will go; then lower back section.

WARNING

Always disconnect the power cord from

(5) Unplug table power cord from outlet receptacle.

(6) Remove four knobs (1, Figure 4-10) and seat

upholstery (2).

(7) Remove two screws (3) and electrical cover (4).

(8) Remove screw (5) and wire clamp (6).

(6) Install tabs (D) of R.H. and L.H. outer

shrouds (2) in slots (E) column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (4) is captured by R.H. and L.H. outer shrouds (2).

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Figure 4-9. Back Actuator

Removal/Installation

SECTION IV

MAINTENANCE / SERVICE

(14) Remove cap (18) from back capacitor (17).

DANGER

A capacitor contains stored electricity.

Never touch terminals of a capacitor, even if power has been shut off or disconnected. Always discharge capacitor before touching capacitor terminals or wires. Failure to comply with these instructions could result in serious personal injury or death.

(15) Discharge back capacitor (17).

(16) Tag and disconnect two actuator wires (19)

from terminals of back capacitor (17); then remove back actuator (13).

(9) Disconnect foot sensor wire harness (7) from

wire harness (8); then pull foot sensor wire harness out thru access hole (A).

EQUIPMENT ALE RT

Be sure all wires are clear of access

hole (A) before driving clevis pin out. Failure to do so could result in damage to wiring harnesses.

(10) Remove two e-rings (9); then using a hammer

and punch, drive clevis pin (10) outward thru access hole (A).

(11) Remove nut (11) and ground wire (12) from

back actuator (13).

(12) Cut two cable ties (B); then disconnect back

actuator wire (14) from wire (15).

(13) Using a screwdriver, pry tab (C) of mounting

bracket (16) outward; then remove back capacitor (17) from mounting bracket.

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Figure 4-10. Back Actuator Removal/Installation

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SECTION IV MAINTENANCE / SERVICE

B. Installation

(1) Loosen two set screws (5, Figure 4-9); then

remove clevis (6) from new back actuator (3).

(2) Install shaft of back actuator (3) thru seat weld-

ment (7), inner cover (8), and outer cover (9).

(3) Connect two actuator wires (19, Figure 4-10) to

terminals of back capacitor (17); then connect actuator wire (14) to wire (15).

(4) Install cap (18) on back capacitor (17).

(5) Position bottom of back capacitor (17) on

mounting bracket (16); then push top of capacitor inward. Using a screwdriver, force tab (C) of mounting bracket over the catch (D) of cap (18). Make sure capacitor is held firmly in place.

(6) Install ground wire (12) on back actuator (13)

and secure with nut (11).

(7) Install clevis pin (10) and secure with two e-

rings (9).

(8) Insert foot sensor wire harness (7) thru access

hole (A); then connect foot sensor wire harness to wire harness (8).

(14) Plug table power cord into wall outlet.

NOTE

To align clevis with back section, it may be necessary to extend back actuator by depressing BACK UP button on hand control.

(15) Secure clevis (6) to back weldment (4) with

bolt (1), and clevis pin (2).

(16) Lower back section until back actuator can be

heard freewheeling.

(17)

Observe.

seat section. If back weldment is not parallel with seat section, go to step 18.

(18) While supporting back section, remove bolt (1),

and clevis pin (2).

(19) Screw clevis (6) inward or outward as deter-

mined necessary in step 17.

(20) Secure clevis (6) to back weldment (3) with

bolt (1), and clevis pin (2).

(21) Repeat steps 16 thru 20 until back section is

parallel with seat section.

Back section should be parallel with

(9) Install wire clamp (6) and secure with screw (5).

(10) Secure wires together as a bundle using two or

more cable ties (B).

(11) Install electrical cover (4) and secure with two

screws (3).

(12) Install seat upholstery (2) and secure with four

knobs (1).

WARNING

The back section of the table is very

heavy and will fall backward when per forming the following steps. Use supports or an assistant to support back section. Failure to comply with these instructions could result in serious personal injury or death.

(13) Raise back section; then while supporting back

section, screw clevis (6, Figure 4-9) into back actuator (3) in until distance (A) is met; then tighten two set screws (5).

4.8 Back Capacitor Removal / Installation

A. Removal

WARNING

Always disconnect the power cord from

the outlet receptacle before removing any of the table's covers / shrouds or making any repairs to prevent the possibility of electrical shock. Failure to comply with these instructions could result in sev ere personal injury or death.

(1) Unplug table power cord from outlet receptacle.

(2) Remove four knobs (1, Figure 4-11) and seat

upholstery (2).

(3) Remove two screws (3) and electrical cover (4).

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(4) Cut two cable ties (5); then using a screwdriver,

pry tab (A) of mounting bracket (6) outward; then remove back capacitor (7) from mounting bracket.

(5) Remove cap (8) from back capacitor (7).

DANGER

A capacitor contains stored electricity.

Never touch terminals of a capacitor, even if power has been shut off or disconnected. Always discharge capacitor before touching capacitor terminals or wires. Failure to comply with these instructions could result in serious personal injury or death.

(6) Discharge back capacitor (7).

(7) Tag and disconnect two actuator wires (9),

and two wires (10) from terminals of back capacitor (7); then remove back capacitor from table.

B. Installation

(1) Connect two actuator wires (9), and two

wires (10) to terminals of back capacitor (7).

(2) Install cap (8) on back capacitor (7).

(3) Position bottom of back capacitor (7) on mount-

ing bracket (6); then push top of capacitor inward. Using a screwdriver, force tab (A) of mounting bracket over the catch (B) of cap (8). Make sure capacitor is held firmly in place.

(4) Secure wires together as a bundle using two or

more cable ties (5).

(5) Install electrical cover (4) and secure with two

screws (3).

(6) Install seat upholstery (2) and secure with four

knobs (1).

Figu re 4-11. Back Cap a citor Removal / In s t a llation

4.9 Foot Actuator Removal / Installation

A. Removal

(1) If possible, raise foot section to its maximum

height; then place supports (A, Figure 4-12) under foot section.

NOTE

If foot section is in its lowest position and will not raise, it may be necessary to remove screw (B) and shoulder spacer (C) before performing step 2.

(2) Remove two klip-rings (1) and clevis pin (2).

(3) Using foot/hand control, retract foot

actuator (3) .

WARNING

Always disconnect the power cord from

the outlet receptacle before removing any of the table's covers / shrouds or making any repairs to prevent the possibility of electrical shock. Failure to comply with these instructions could result in sev ere personal injury or death.

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(12) Remove cap (14) from foot capacitor (13).

DANGER

A capacitor contains stored electricity.

Never touch terminals of a capacitor, even if power has been shut off or disconnected. Always discharge capacitor before touching capacitor terminals or wires. Failure to comply with these instructions could result in serious personal injury or death.

(13) Discharge foot capacitor (13).

(14) Tag and disconnect two actuator wires (15)

from terminals of foot capacitor (13).

(15) Remove foot actuator (9); then remove two

screws (16), two nuts (17), and limit switch (3) from foot actuator.

Figure 4-12. Foot Actuator Removal / Installation

(4) Unplug table from wall outlet.

(5) Remove four knobs (4) and seat upholstery (5).

(6) Remove two screws (6) and electrical cover (7).

(7) Cut two cable ties (1, Figure 4-13); then tag and

disconnect two wires (2) from terminals of limit switch (3).

(8) Remove hole plug (4) and two klip-rings (5);

then using a hammer and punch, drive clevis pin (6) out thru hole (A).

(9) Remove nut (7) and ground wire (8) from foot

actuator (9).

(10) Disconnect foot actuator wire (10) from

wire (11).

(16) Remove screw (18), nutsert (19), top clevis

cover (20), and bottom clevis cover (21).

(11) Using a screwdriver, pry tab (B) of mounting

bracket (12) outward; then remove foot capacitor (13) from mounting bracket.

Page 4-12

Figure 4-13. Foot Actuator Removal / Installation

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B. Installation

(1) Install bottom clevis cover (21), top clevis

cover (20), and nutsert (19); then secure with screw (18).

(2) Install limit switch (3) on foot actuator (9);

then secure with two screws (16), and two nuts (17).

(3) Insert shaft of foot actuator (9) thru hole in seat

weldment (22).

(4) Connect two actuator wires (15) to terminals of

foot capacitor (13).

(5) Install cap (14) on foot capacitor (13).

(6) Position bottom of foot capacitor (13) on mount-

ing bracket (12); then push top of capacitor inward. Using a screwdriver, force tab (B) of mounting bracket over the catch (C) of cap (14). Make sure capacitor is held firmly in place.

(7) Connect foot actuator wire (10) to wire (11).

(8) Install ground wire (8) onto foot actuator (9) and

secure with nut (7).

(9) Connect two wires (2) to proper terminals of

limit switch (3).

(10) Secure wires together as a bundle using two or

more cable ties (1).

(11) Install clevis pin (6) and secure with two klip-

rings (5); then install hole plug (4).

(12) Install electrical cover (7, Figure 4-12) and

secure with two screws (6).

(13) Plug table power cord into wall outlet.

4.10 Foot Capaci tor R em o v al / I nst allat ion

A. Removal

WARNING

Always disconnect the power cord from

the outlet receptacle before removing any of the table's covers / shrouds or making any repairs to prevent the possibility of electrical shock. Failure to comply with these instructions could result in sev ere personal injury or death.

(1) Unplug table power cord from outlet receptacle.

(2) Remove four knobs (1, Figure 4-14) and seat

upholstery (2).

(3) Remove two screws (3) and electrical cover (4).

(4) Cut two cable ties (5); then using a screwdriver,

pry tab (A) of mounting bracket (6) outward; then remove foot capacitor (7) from mounting bracket.

(5) Remove cap (8) from foot capacitor (7).

DANGER

A capacitor contains stored electricity.

Never touch terminals of a capacitor, even if power has been shut off or disconnected. Always discharge capacitor before touching capacitor terminals or wires. Failure to comply with these instructions could result in serious personal injury or death.

(6) Discharge foot capacitor (7).

(7) Tag and disconnect two wires (9) and two

wires (10) from terminals of foot capacitor (7); then remove foot capacitor from table.

(14) Using foot/hand control, extend foot actuator (3)

until actuator shaft aligns with foot section weldment (8).

(15) Install clevis pin (2) thru foot actuator (3) and

foot section weldment (8) and secure with two klip-rings (1); then remove supports (A).

(16) Install seat upholstery (5) and secure with four

knobs (4).

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B. Installation

Page 4-13

(1) Connect two wires (9) and two wires (10) to ter-

minals of foot capacitor (7).

(2) Install cap (8) on foot capacitor (7).

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4.11 Base Actuator Removal / Installation

A. Removal

(1) Run BASE UP function until table reaches its

maximum height.

(2) Run TILT, FOOT, and BACK functions to level

table top.

WARNING

Always disconnect the power cord from

(3) Unplug table power cord from outlet receptacle.

Figure 4-14. Foot Capacitor Removal / Instal l ation

(3) Position bottom of foot capacitor (7) on mount-

ing bracket (6); then push top of capacitor inward. Using a screwdriver, force tab (A) of mounting bracket over the catch (B) of cap (8). Make sure capacitor is held firmly in place.

(4) Secure wires together as a bundle using two or

more cable ties (5).

(4) Remove four screws (1, Figure 4-15) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(5) Remove four screws (4) and R.H. and L.H. mid-

dle shrouds (5).

(6) Disconnect two modular cords (6) from two

inlet PC boards (7).

(7) Remove four screws (8), and four screws (9);

then partially remove R.H. and L.H. inner shrouds (10) from base casting (11).

(8) Place supports (A) under back section (B) and

foot section (C).

(9) Remove two screws (1, Figure 4-16) and PC

board cover (2) from base casting (3).

(10) Remove screw (4) and cable strap (A) from

base casting (3). Cut cable strap.

(11) Cut all cable ties (B) securing base actuator

wires to other wires.

(5) Install electrical cover (4) and secure with two

screws (3).

(6) Install seat upholstery (2) and secure with four

knobs (1).

Rev. 3/00

Page 4-14

(12) Remove plastic wrapping (5) from around wires.

(13) Disconnect base wire harness (6) and brake

wire harness (7) from PC control board (8).

(14) Loosen screw (9).

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SECTION IV

MAINTENANCE / SERVICE

Figure 4-15. Base Shrouds Removal / Installation

(15) Push base capacitor (10) out of capacitor

strap (11).

DANGER

A capacitor contains stored electricity.

(16) Discharge base capacitor (10).

(17) Tag and disconnect two actuator wires (12)

from terminals of base capacitor (10).

(18) Cut two wire ties (13); then remove limit switch

bracket (14) from base actuator (15).

(19) On programmable tables only, remove

screw (16) and cable bracket (17) from pivot screw (18).

(20) Loosen two jam nuts (19).

DANGER

Make sure table top is securely held

by supports to prevent it from falling once pivot screws are removed. Failure to do so could result in serious personal injury or death.

(21) Remove two pivot screws (20) securing base

actuator (15) to column assembly (21).

(22) Loosen two jam nuts (22).

(23) Remove two pivot screws (18) and base actua-

tor (15) from column assembly (21).

(24) Loosen three screws (23).

B. Installation

(1) Remove jam nuts (19 and 22, Figure 4-16) from

pivot screws (18 and 20).

Page 4-15

Printe d in U.S .A.

Page 54

SECTION IV MAINTENANCE / SERVICE

Figure 4-16. Base Actuator Removal / Installation

(2) Clean adhesive residue from threads of four

pivot screws (18 and 20).

(3) Screw jam nuts (19 and 22) on pivot screws (18

and 20) fully.

(4) Coat the threads of two pivot screws (20), which

are located directly in front of jam nuts (19), with permanent threadlocking adhesive (Loctite 262).

NOTE

When installing pivot screws, adjust pivot screws until shaft (C) of base actuator (15) is centered in bracket.

(5) Install base actuator (15) on column

assembly (21) and secure with two pivot screws (20). Tighten pivot screws to 50 to 60 in-lbs. (5.6 to 6.8 N•m).

(6) Tighten two jam nuts (19) to 45 - 55 ft-lbs. (61 to

74.6 N•m).

(8) Connect brake wire harness (7) and base wire

harness (6) to PC control board (8).

(9) Connect two actuator wires (12) to terminals of

base capacitor (10).

(10) Slide base capacitor (10) into capacitor

strap (11) and secure by tightening screw (9).

(11) Secure wires together with cable strap (A).

Secure cable strap to base casting (3) with screw (4).

(12) Secure wires together as a bundle with two or

more cable ties (B).

(13) Install PC board cover (2) on base casting (3)

and secure with two screws (1).

(14) Plug one modular cord (6, Figure 4-15) into

each inlet PC board (7).

(7) Install plastic wrapping (5) around base actua-

tor wires.

Page 4-16

Printe d in U.S .A.

Page 55

SECTION IV

MAINTENANCE / SERVICE

(15) Plug table power cord into outlet receptacle.

EQUIPMENT ALERT

On programmable tables, make sure cable

bracket (17, Figure 4-16) is clear of the column assembly. Failure to do so could result in the cable bracket being damaged.

(16) Run BASE UP and / or BASE DOWN

function until shaft (C, Figure 4-16) of base actuator (15) is aligned with bracket of column assembly (21).

(17) Coat threads of two pivot screws (18), which

are directly in front of jam nuts (22), with permanent threadlocking adhesive (Loctite 262).

NOTE

When installing pivot screws, adjust pivot screws (18) until shaft (C) of base actuator (15) is centered in bracket.

(18) Secure shaft (C) of base actuator (15) on col-

umn assembly (21) and secure with two pivot screws (18). Tighten pivot screws to 50 to 60 in-lbs. (5.6 to 6.8 N•m).

(19) Tighten two jam nuts (22) to 45 - 55 ft-lbs. (61 to

74.6 N•m).

(20) Tighten three screws (23) to 23 - 27 ft-lbs

(31 - 36 N•m).

(21) On programmable tables, install cable

bracket (17) on R.H. pivot screw (18) and secure with screw (16). Do not wrap cable (24) around pulley (25) at this time.

(22) Run BASE UP function until table top is off of

supports (A, Figure 4-15); then remove supports from under table top.

(23) Lower BASE DOWN function all the way down.

(24) On programmable tables, wrap cable (24, Fig-

ure 4-16) around pulley (25) in direction shown in illustration until all cable slack is removed. Cable should be able to be wrapped around pulley 2-1/2 to 3 times.

(25) Raise BASE UP function to its maximum

height.

(26) Clean shaft (A, Figure 4-17) of base

actuator (1) and inside of limit switch stop (2) with degreaser.

EQUIPMENT ALERT

Once applied, double sided tape is very

difficult to remove. Be sure to position double sided tape at the top of limit switch stop as shown in Figure 4-17. Failure to do so could result in damage to base actuator limit switch.

(27) Peel off one side of backing, and apply double

sided tape (3) to the inside of limit switch stop (2); then peel backing from other side of

tape.

EQUIPMENT ALERT

Be sure to install limit switch stop in the

position shown in Figure 4-17. Improper positioning could allow foot rest extension to collide with floor.

(28) Install limit switch stop (2) on shaft (A) of

base actuator (1) so that edges (B and C) are approximately 1/16 in. (1.6 mm) from pivot screws (4 and 5).

(29) Clean tube (D) of base actuator (1) with

degreaser.

NOTE

Once applied, double sided tape is very difficult to remove. Be sure to apply double sided tape in the position shown in Figure 4-17.

NOTE

If necessary, the pulley (25, Figure 4-16) can be rotated back and forth up to 1/2 turn to assist in getting the cable (24) on the pulley.

Rev. 10/01

(30) Peel off one side of backing, and apply double

sided tape (6) to tube (D) of base actuator (1); then peel backing from other side of tape.

Page 56

SECTION IV MAINTENANCE / SERVICE

EQUIPMENT ALERT

Be sure to install limit switch bracket in the

position shown in Figure 4-17. Improper positioning could allow foot rest extension to collide with floor.

(31) Position limit switch bracket (7) on double sided

tape (6) so that roller (8) of limit switch is even with the highest edge of tube (D).

(32) Plug table power cord into wall outlet.

(33) Run BASE UP function to its maximum height;

then pull foot rest extension (1, Figure 4-18) out as far as it will go.

(34) Run FOOT DOWN, and TILT DOWN functions

to their lowest positions.

Figure 4-18. Minimum Clearance Requirement

(35) Depress BASE DOWN button on foot/hand

control.

Observe. Table should go approximately 1/2

way down then stop; Foot Rest Extension lamp on the hand control should flash. There should

be a minimum of 2.0 in. (5.0 cm) clearance

between the foot section upholstery (2) and the floor (3). If minimum clearance is met, go to

step 36. If clearance is less than 2.0 in. (5.0

cm) go to step 35.

(36) If there is less than 2.0 in. (5.0 cm) of clearance

between foot section upholstery (2) and floor (3), adjust as follows:

Remove limit switch bracket (7, Figure 4-17) from double sided tape (6); then move limit switch bracket upward on tube (D) of base actuator (1) and repeat steps 33 thru 34.

(37) Secure limit switch bracket (7) to base

actuator (1) with two wire ties (8).

EQUIPMENT ALERT

When installing shrouds, make sure all

bumpers and snap-on glides are in place. Failure to do so could result in damage to shrouds and grinding sounds when table is raised and lowered.

Figure 4-17. Base Limit Switch / Limit Switch Stop

Removal / Installation

Rev. 10/01

(38) Install R.H. and L.H. inner shrouds (12, Figure

4-15) on base casting (13) and secure with four screws (9), and four screws (8).

(39) Assemble R.H. and L.H. middle shrouds (5)

around inner shrouds (12) with four screws (4).

Page 57

SECTION IV

MAINTENANCE / SERVICE

(40) Install tabs (D) of R.H. and L.H. outer shrouds

(2) in slots (E) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (5) is captured by R.H. and L.H. outer shrouds (2).

(41) On programmable tables, calibrate the PC con-

trol board (Refer to para 4.2).

4.12 Base Capacitor Removal / Installation

A. Removal

(1) Run BASE UP function to its maximum height.

WARNING

Always disconne ct the po wer cor d from

(2) Unplug table power cord from outlet receptacle.

(3) Remove four screws (1, Figure 4-19) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(4) Remove four screws (4) and R.H. and L.H. mid-

dle shrouds (5).

(5) Disconnect two modular cords (6) from two inlet

PC boards (7).

(6) Remove four screws (8),and four screws (9);

then partially remove R.H. and L.H. inner shrouds (10) from base casting (11).

(7) Loosen screw (12).

(8) Push base capacitor (13) out of capacitor

strap (14).

Figure 4-19. Base Capacitor Removal / Installation

Rev. 10/01

Page 58

SECTION IV MAINTENANCE / SERVICE

DANGER

A capacitor contains stored electricity.

4.13 Column Assembly Removal / Installation

A. Removal

(1) Run BASE UP function to its maximum height.

(2) Run TILT, FOOT, and BACK functions to level

table top.

(9) Discharge base capacitor (13).

(10) Tag and disconnect four wires (15) from termi-

nals of base capacitor (13).

B. Installation

(1) Connect four wires (15) to terminals of base

capacitor (13).

(2) Slide base capacitor (13) into capacitor

strap (14) and secure by tightening screw (12).

(3) Connect two modular cords (6) to two inlet PC

boards (7).

(4) Install R.H. and L.H. inner shrouds (10) on base

casting (11) and secure with four screws (9), and four screws (8).

(5) Assemble R.H. and L.H. middle shrouds (5)

around inner shrouds (10) with four screws (4).

(6) Install tabs (A) of R.H. and L.H. outer

shrouds (2) in slots (B) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (5) is captured by R.H. and L.H. outer shrouds (2).

WARNING

Always disconnect the power cor d fr om

(3) Unplug table power cord from outlet receptacle.

(4) Remove four screws (1, Figure 4-20) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(5) Remove four screws (4) and R.H. and L.H. mid-

dle shrouds (5).

(6) Disconnect two modular cords (6) from two inlet

PC boards (7).

(7) Remove four screws (8), four screws (9) and

partially remove R.H. and L.H. inner shrouds (10) from base casting (11).

(8) Place supports (A) under back section (B) and

foot section (C).

NOTE

Steps 9 thru 12 apply only to programmable tables.

Rev. 10/01

(9) Remove screw (1, Figure 4-21) and cable

bracket (2) from R.H. pivot screw (3).

(10) Cut cable tie (A) securing base sensor

harness (4) to capacitor strap (5).

(11) Disconnect base sensor harness (4) from har-

ness (6).

(12) Remove two screws (7) and base reducer

assembly (8) from column weldment assembly (9).

Page 59

SECTION IV

MAINTENANCE / SERVICE

Figure 4-20. Base Shrouds Removal / Installation

(13) Cut cable tie (B) securing wire harness (10) to

base actuator limit switch (11); then disconnect wire harness from terminals of base actuator limit switch.

(14) Remove screw (1, Figure 4-22), capacitor

strap (2), and base capacitor (3) from column assembly (4). Set base capacitor aside.

DANGER

A capacitor contains stored electricity.

Never touch terminals of a capacitor, even if power has been shut off or disconnected. Always discharge capacitor before touching capacitor terminals or wires. Failure to comply with these instructions could result in serious personal injury or death.

(15) Discharge base capacitor (3).

(16) Loosen two jam nuts (5).

DANGER

Make sure table top is securely sup-

ported by supports to prevent it from falling once pivot screws are removed. Failure to do so could res ult in s e r i o u s person al inju r y or death.

(17) Remove two pivot screws (6) securing base

actuator (7) to column assembly (4).

(18) Loosen two jam nuts (8).

(19) Remove two pivot screws (9) and partially

remove base actuator (7) from column assembly (4). Set base actuator aside.

(20) Loosen three screws (10).

Page 4-21

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SECTION IV MAINTENANCE / SERVICE

Figure 4-21. Base Reducer Components Removal / Installation

(21) Remove two screws (1, Figure 4-23), lockwash-

ers (2), and base up limit switch assembly (3) from column assembly (4).

(22) Remove two screws (5), lockwashers (6), and

base down limit switch assembly (7) from column assembly (4).

(23) Remove two locknuts (8) and four screws (9)

which secure column assembly (4) to column adapter weldment (10).

(24) Remove four screws (11) and four washers (12)

securing column assembly (4) to base weldment (13).

(25) Remove column assembly (4) from base weld-

ment (13).

B. Installation

(1) Position column assembly (4, Figure 4-23) on

base weldment (13) and secure with four washers (12) and four screws (11). Tighten four screws (11) to 50 to 60 ft-lbs (67.8 to 81.4 N•m).

(2) Remove jam nuts (5 and 8, Figure 4-22) from

pivot screws (6 and 9).

(3) Clean adhesive residue from threads of pivot

screws (6 and 9).

(4) Screw jam nuts (5 and 8) on pivot screws (6

and 9) fully.

(5) Coat the threads of two pivot screws (9), which

are located directly in front of jam nuts (8), with permanent threadlocking adhesive (Loctite 262).

NOTE

When installing pivot screws, adjust pivot screws until shaft (A) of base actuator is centered in bracket.

(6) Install base actuator (7) on column

assembly (4) and secure with two pivot screws (9). Tighten pivot screws to 50 to 60 inlbs (5.6 to 6.8 N•m).

(7) Tighten two jam nuts (8) to 45 to 55 ft-lbs. (61 to

74.6 N•m).

Page 4-22

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SECTION IV

MAINTENANCE / SERVICE

(12) Coat the threads of two pivot screws (6), which

are located directly in front of jam nuts (5), with permanent threadlocking adhesive (Loctite

262).

NOTE

When installing pivot screws, adjust pivot screws until shaft (A) of base actuator is centered in bracket.

(13) Secure shaft (A) of base actuator (7) to column

assembly (4) and secure with two pivot screws (6). Tighten pivot screws to 50 to 60 inlbs. (5.6 to 6.8 N•m).

(14) Tighten two jam nuts (5) to 45 to 55 ft-lbs. (61 to

74.6 N•m).

(15) Tighten three screws (10) to 17 - 20 ft-lbs (23 -

27.1 N•m).

Figure 4-22. Base Actuator Removal / Installation

(8) Install base capacitor (3) and capacitor strap (2)

on column assembly (4) and secure with screw (1).

(9) Plug table power cord into outlet receptacle.

(10) Connect two modular cords (6, Figure 4-20) to

two inlet PC boards (7).

EQUIPMENT ALE RT

Watch all disconnected components when

moving the column in the following step. Failure to do so could result in damage due to crushing or pulling.

(11) Run BASE UP or BASE DOWN function until

shaft (A, Figure 4-22) of base actuator (7) is aligned with bracket of column assembly (4).

(16) Run BASE UP function to align column assem-

bly (4, Figure 4-23) with column adapter weldment (10).

(17) Secure column assembly (4) to column adapter

weldment (10) with four screws (9) and two locknuts (8). Tighten screws (9) to 50 - 60 ftlbs. (67.5 - 81.0 N•m).

(18) Run BASE UP function until weight is off of sup-

ports; then remove supports (A, Figure 4-20) from under table top.

(19) Install base down limit switch assembly (7, fig-

ure 4-23) on column assembly (4) and secure with two lockwashers (6) and screws (5).

(20) Adjust base down limit switch (Refer to

para 4.15).

(21) Install base up limit switch assembly (3) on col-

umn assembly (4) and secure with two lockwashers (2) and screws (1).

(22) Adjust base up limit switch (Refer to para 4.16).

(23) Connect wire harness (10, Figure 4-21) to base

actuator limit switch (11) and secure with cable tie (B).

Rev. 3/00

Page 4-23

NOTE

Steps 24 thru 29 apply only to programmable tables.

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SECTION IV MAINTENANCE / SERVICE

(24) Install base reducer assembly (8) on column

weldment assembly (9) and secure with two screws (7).

(25) Connect base sensor harness (4) to

harness (6).

(26) Secure base sensor harness (4) and limit

switch wire harness (10) to capacitor strap (5) with cable tie (A).

(27) Install cable bracket (2) on R.H. pivot screw (3)

and secure with screw (1). Do not wrap cable (12) around pulley (13) at this time.

(28) Run BASE DOWN function all the way down.

NOTE

If necessary, the pulley (13) can be rotated back and forth up to 1/2 turn to assist in getting the cable (12) on the pulley.

(29) Wrap cable (12) around pulley (13) in direction

shown in illustration until all cable slack is removed. Cable should be able to be wrapped around pulley 2-1/2 to 3 times.

(30) Connect two modular cords (6, Figure 4-20) to

two inlet PC boards (7).

(31) Install R.H. and L.H. inner shrouds (10) on base

casting (11) and secure with four screws (9), and four screws (8).

MA368000

Figure 4-23. Column Assembly Removal / Installation

Rev. 3/00

Page 4-24

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Page 63

(32) Assemble R.H. and L.H. middle shrouds (5)

around inner shrouds (10) with four screws (4).

(33) Install tabs (D) of R.H. and L.H. outer

shrouds (2) in slots (E) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (5) is captured by R.H. and L.H. outer shrouds (2).

(34) On programmable tables, adjust the base posi-

tion sensor (Refer to para 4.36).

(35) On programmable tables, calibrate the PC con-

trol board (Refer to para 4.2).

4.14 Typical Actuator Motor Removal / Installation (Applies To All Actuators, Except Base Actuator)

SECTION IV

MAINTENANCE / SERVICE

A. Removal

(1) Remove malfunctioning actuator assembly:

Tilt actuator assembly (Refer to para 4.5). Back actuator assembly (Refer to para 4.7). Foot actuator assembly (Refer to para 4.9).

(2) Remove four nuts (1, Figure 4-24), actuator

motor (2), and isolation washer (3) from actuator mechanism (4).

(3) Remove three shoulder washers (5) from actua-

tor mechanism (4).

(4) Remove motor coupler (6) from shaft of actua-

tor motor (2).

B. Installation

(1) Install motor coupler (6) on shaft of actuator

motor assembly (2); then install isolation washer (3) onto motor assembly.

(2) Install three shoulder washers (5) in actuator

mechanism (4).

Figure 4-24. Actuator Motor Removal / Installation

(4) Install actuator assembly:

Tilt actuator assembly (Refer to para 4.5). Back actuator assembly (Refer to para 4.7). Foot actuator assembly (Refer to para 4.9).

(5) Check actuator assembly for proper operation.

The actuator assembly should run normally and should not make a grinding noise. A grinding noise indicates that key slots (B) of motor coupler (6) were not aligned properly with keys (A) of actuator mechanism (3) (a grinding noise also indicates that the motor coupler is being damaged).

(3) Align keys (A) of actuator mechanism (4) with

key slots (B) of motor coupler (6) and then install actuator motor (2) on actuator mechanism and secure with four nuts (1).

Page 4-25

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SECTION IV MAINTENANCE / SERVICE

4.15 Base Down Limit Switch Removal / Installation / Adjustment

A. Removal

WARNING

Always disconnect the power cord from

(1) Unplug table power cord from outlet receptacle.

(2) Remove four screws (1, Figure 4-25) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(3) Remove four screws (4) and R.H. and L.H. mid-

dle shrouds (5).

(4) Remove two screws (6), two washers (7), and

partially remove switch bracket (8) from column weldment (9).

(5) Tag and disconnect two wires (10) from termi-

nals of base down limit switch (11).

(6) While simultaneously pressing on two locking

tabs (A) of base down limit switch (11), push switch out of switch bracket (8)

B. Installation

(1) Push base down limit switch (11) into switch

bracket (8) until switch "snaps" into place.

(2) Connect two wires (10) to terminals of base

down limit switch (11).

(3) Install switch bracket (8) on column

weldment (9) and secure with two washers (7) and screws (6).

Figure 4-25. Base Down Limit Switch Removal / Installation / Adjustment

Page 4-26

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SECTION IV

MAINTENANCE / SERVICE

(4) Plug table power cord into outlet receptacle.

(5) Run BASE DOWN function until base down

limit switch is tripped and stops the table.

EQUIPMENT ALE RT

At its lowest height, Distance B should be

12.55 to 12.61 in. (31.9 to 32.0 cm). Damage will occur to base actuator (C) if Distance B is less than 12.55 (31.9 cm). The base actuator (C) does not free wheel. Running the base actuator to its limit will damage the base actuator.

(6) Measure Distance B on base actuator.

(7) If Distance B is between 12.55 to 12.61 in.

(31.9 to 32.0 cm), go to step 11. If Distance B is not between 12.55 to 12.61 in. (31.9 to 32.0 cm), go to step 8.

(8) Raise BASE UP function until access to base

down limit switch (11) is possible.

NOTE

Moving base down limit switch upward will lessen Distance B. Moving base down limit switch downward will increase Distance B.

(9) Loosen two screws (6); then adjust switch

bracket (8) up or down as determined necessary in step 7. Tighten two screws (6).

(10) Repeat steps 5 thru 9 until Distance B is

between 12.55 to 12.61 in. (31.9 to 32.0 cm). when base actuator is fully retracted (stopped by base down limit switch).

(2) Perform steps 4 thru 12 of para 4.15B.

4.16 Base Up Limit Switch Removal / Installation / Adjustment

A. Removal

WARNING

Always disconnect the power cord from

(1) Unplug table power cord from outlet receptacle.

(2) Remove four screws (1, Figure 4-26) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(3) Remove four screws (4) and R.H. and L.H. mid-

dle shrouds (5).

(4) Disconnect two modular cords (6) from two inlet

PC boards (7).

(5) Remove four screws (8),and four screws (9);

then partially remove R.H. and L.H. inner shrouds (10) from base casting (11).

(6) Remove two screws (12), washers (13), and

partially remove limit switch bracket (14) from column weldment (15).

(7) Cut cable tie (A) securing wire harness (16) to

base up limit switch (17).

(11) Assemble R.H. and L.H. middle shrouds (5)

around inner shrouds (12) and secure with four screws (4).

(12) Install tabs (D) of R.H. and L.H. outer

shrouds (2) in slots (E) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (5) is captured by R.H. and L.H. outer shrouds (2).

C. Adjustment Only

(1) If not already done, perform steps 1 thru 3 of

para 4.15A.

Rev. 3/00

B. Installation

Page 4-27

(8) Disconnect wire harness (16) from terminals of

base up limit switch (17).

(9) Remove two nuts (18), two screws (19), and

base up limit switch (17) from limit switch bracket (14).

(1) Install base up limit switch (17) on limit switch

bracket (14) and secure with two screws (19) and nuts (18).

(2) Connect wire harness (16) to terminals of base

up limit switch (17).

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SECTION IV MAINTENANCE / SERVICE

Figure 4-26. Base Up Limit Switch Removal / Installation

(3) Secure wire harness (16) to base up limit

switch (17) with cable tie (A).

(4) Install switch bracket (14) on column

weldment (15) and secure with two washers (13) and screws (12).

(5) Connect one modular cord (6) to each inlet PC

board (7).

(6) Plug table power cord into outlet receptacle.

(7) Run BASE UP function until base up limit

switch is tripped and stops the table).

EQUIPMENT ALERT

At its fullest extension, Distance B should

be 21.48 to 21.55 in. (54.5 to 54.7 cm). Damage will occur to base actuator (C) if Distance B is greater than 21.55 (54.7 cm). The base actuator does not free wheel. Running the base actuator to its limit will damage the base actuator.

(8) Measure Distance B on base actuator.

(9) If Distance B is between 21.48 to 21.55 in.

(54.5 to 54.7 cm), go to step 13. If Distance B is not between 21.48 to 21.55 in. (54.5 to 54.7 cm), go to step 10.

(10) Lower BASE DOWN function approximately

3 in. (7.6 cm).

NOTE

Moving base up limit switch upward / outward will increase Distance B. Moving base down limit switch inward / downward will decrease Distance B.

(11) Loosen two screws (12); then adjust

switch bracket (14) upward/outward or downward/inward as determined necessary in step 9. Tighten two screws (12).

Rev. 3/00

Page 4-28

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SECTION IV

MAINTENANCE / SERVICE

(12) Repeat steps 7 thru 11 until Distance B is

between 21.48 to 21.55 in. (54.5 to 54.7 cm). when base actuator (C) is fully extended (stopped by base up limit switch).

(13) Install R.H. and L.H. inner shrouds (10) on base

casting (11) and secure with four screws (9), and four screws (8).

(14) Assemble R.H. and L.H. middle shrouds (5)

around inner shrouds (10) with four screws (4).

(15) Install tabs (D) of R.H. and L.H. outer

shrouds (2) in slots (E) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (5) is captured by R.H. and L.H. outer shrouds (2).

C. Adjustment Only

(1) If not already done, perform steps 1 thru 5 of

para 4.16A.

(2) Perform steps 6 thru 15 of para 4.16B.

4.17 Chain Tension Check / Adjustment

A. Tension Check / Adjustment

(1) Raise BASE UP function all the way up.

(2) Operate table top until it is in a horizontal posi-

tion.

(3) Place supports under foot section and back

section of table top. Lower BASE DOWN function slightly until weight of table top is resting on supports.

(4) Unplug table power cord from outlet receptacle.

WARNING

Always disconnect the power cord from

Figure 4-27. Chain Tension Check / Adjustment

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SECTION IV MAINTENANCE / SERVICE

(5) Remove four screws (1, Figure 4-27) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(6) Remove four screws (4) and R.H. and L.H. mid-

dle shrouds (5).

(7) Measure slack (measurement B) in chain (6)

at a point 1 3/4 to 2 1/4 in. (4.4 to 5.7 cm) above top of outer slide weldment (7) (measurement A).

(8) If slack in chain (6) is between 1/16 to 3/16 in.

(1.6 to 4.8 mm), go to step 18. See measurement B. If slack in chain (6) is not between 1/16 to 3/16 in. (1.6 to 4.8 mm), go to step 9. See measurement B.

(9) Disconnect two modular cords (8) from two

inlet PC boards (9).

(10) Remove four screws (10),and four screws (11);

then partially remove R.H. and L.H. inner shrouds (12) from base casting (13).

(11) Loosen locking screw (14).

(21) Install tabs (C) of R.H. and L.H. outer

shrouds (2) in slots (D) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (5) is captured by R.H. and L.H. outer shrouds (2).

4.18 Eccentric Bearings Adjustment

A. Adjustment

WARNING

Always disconnect the power cord from

(1) Unplug table power cord from outlet receptacle.

(2) Remove four screws (1, Figure 4-28) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(3) Remove four screws (4) and R.H. and L.H. mid-

dle shrouds (5).

(12) Loosen jam nut (15).

(13) Tighten adjusting nut (16) until slack in chain (6)

is between 1/16 to 3/16 in. (1.6 to 4.8 mm). See measurement B.

(14) Repeat entire procedure to ensure correct

adjustment.

(15) Coat threads of jam nut (15) with permanent

threadlocking adhesive (Loctite 262).

(16) Tighten jam nut (15).

(17) Tighten locking screw (14).

(18) Connect modular cords (8) to inlet PC

boards (9).

(19) Install R.H. and L.H. inner shrouds (12) on base

casting (13) and secure with four screws (10), and four screws (11).

(20) Assemble R.H. and L.H. middle shrouds (5)

around inner shrouds (12) and secure with four screws (4).

(4) Disconnect two modular cords (6) from two inlet

PC boards (7).

(5) Remove four screws (8), four screws (9),

and partially remove R.H. and L.H. inner shrouds (10) from base casting (11).

NOTE

The eccentric bearings are divided into four groups for purposes of adjustment. Only one group of bearings can be adjusted at one time. For identification purposes, the left side of table is labeled “L.S.O.T.” and the head end of table is labeled “H.E.O.T.”. Also, the column assembly has two types of bearing assemblies: the concentric tire bearing assembly “C.T.B.A.” and the eccentric tire bearing assembly “E.T.B.A.” The concentric tire bearings are not adjustable, so the following steps refer only to the eccentric tire bearings.

(6) Run BASE UP and BASE DOWN function

while observing all eccentric bearings (1, Figure 4-29).

Page 4-30

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SECTION IV

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Figure 4-28. Base Shrouds Removal / Installation

(7) Note which eccentric bearings (1) do not rotate

during entire movement of column assembly; these are the bearings which need adjusted.

(8) Determine what letter group the eccentric bear-

ing you need to adjust is in; Group A1, Group B1, Group C1, or Group D1.

(9) Install 5/16 - 18 x 1-1/4 Bolt(s) (E) in the Ten-

sion hole(s) which matches the letter group of eccentric bearing being adjusted; for Group A1, bolt is installed in Tension Hole A2, for Group B1, bolt is installed in Tension Hole B2, for Group C1, bolts are installed in Tension Holes C2, for Group D1, bolts are installed in Tension Holes D2. Refer to Table 1-2 for special tool.

(10) Tighten 5/16 - 18 x 1-1/4 Bolt(s) (E) until ten-

sion is relieved from the eccentric bearing (1) being adjusted.

(11) Loosen screw (2) of appropriate eccentric bear-

ing.

(12) Rotate outer tire (3) of eccentric bearing (1) in a

clockwise direction (as viewed from outside of column) until eccentric bearing becomes harder / or impossible to rotate (meaning the eccentric spindle (4) in the eccentric bearing is forcing the outer tire against the column weldment rail as desired). Secure eccentric bearing in this position by tightening screw (2) to 23 to 27 ft-lbs. (28.8 to 36.4 N•m).

(13) Remove 5/16 - 18 x 1-1/4 Bolt(s) (E) from Ten-

sion hole.

(14) Repeat step 6 thru 13 until all eccentric bear-

ings are properly adjusted.

(15) Connect modular cords (6, Figure 4-28) to inlet

PC boards (7).

(16) Install R.H. and L.H. inner shrouds (10) on base

casting (11) and secure with four screws (9), and four screws (8).

Page 4-31

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SECTION IV MAINTENANCE / SERVICE

E.T.B.A.C.T.B.A.

(17) Assemble R.H. and L.H. middle shrouds (5)

around inner shrouds (10) and secure with four screws (4).

(18) Install tabs (A) of R.H. and L.H. outer

shrouds (2) in slots (B) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (5) is captured by R.H. and L.H. outer shrouds (2).

4.19 Hand / Foot Control Inlet PC Board Removal / Installation

A. Removal

(1) Raise base and foot sections to their maximum

height.

WARNING

Always disconnect the power cord from

L.S.O.T.

Figure 4-29. Eccentric Bearings Adjustment

H.E.O.T.

MA368700

(2) Unplug table power cord from outlet receptacle.

(3) Remove four screws (1, Figure 4-30) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(4) Lower middle outer shroud assembly (4) down

out of way.

(5) Unplug modular cord (5) from port of inlet PC

board (6).

(6) Remove screw (7), ground wire (8), and star-

washer (9) from base casting (10).

(7) Remove two screws (11), inlet board cover (12),

and inlet PC board (6) from inner shroud (13).

B. Installation

(1) Install inlet PC board (6) on inside of inner

shroud (13), and inlet board cover (12) on outside of inner shroud and secure with two screws (11).

Page 4-32

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SECTION IV

MAINTENANCE / SERVICE

(2) Secure starwasher (9) and ground wire (8) to

base casting (10) with screw (7).

(3) Plug modular cord (5) into port of inlet PC

board (6).

(4) Install tabs (A) of R.H. and L.H. outer

shrouds (2) in slots (B) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (4) is captured by R.H. and L.H. outer shrouds (2).

4.20 Hand Control PC Board Removal / Installation

A. Removal

(1) Disconnect coil cord (1, Figure 4-31) from table.

(2) Remove four screws (2) and hand control bot-

tom (3) from hand control top (4).

Figure 4-30. Control Inlet PC Board

Rem ova l / Instal la tion

(3) Disconnect coil cord (1) from PC board (5).

(4) Disconnect ribbon conector (6) from PC

board (5)

NOTE

To remove hand control switch panel, peel adhesive switch panel from hand control top; then pull ribbon connector thru slot in hand control top.

(5) Using a flat-bladed screwdriver, pry upward on

two retaining rings (7) until they separate from two standoffs (8); then remove PC board (5).

B. Installation

NOTE

To install hand control switch panel, peel backing from switch panel, insert ribbon connector thru slot in hand control top; then position switch panel on hand control top and apply pressure.

(1) Connect ribbon connector (6) to PC board (5).

NOTE

Be sure to push two retaining rings all the way down against PC board.

Page 4-33

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SECTION IV MAINTENANCE / SERVICE

MIDMARK

MA495100

Figure 4-31. Hand Control PC Board

Removal / Inst a l la tion

(2) Install PC board (5) on two standoffs (8) and

secure with two retaining rings (7).

(3) Connect coil cord (1) to PC board (5).

MIDMARK

Figure 4-32 . Foot C ontrol Top

Removal / Installation (Non-Programmable )

MA495200

EQUIPMENT ALE RT

Be sure to align coil cord (1) with notch (A) in hand control bottom (3). Failure to do so

could result in damage to coil cord.

(4) Install hand control bottom (3) on hand control

top (4) and secure with four screws (2).

(5) Connect coil cord (1) to table.

4.21 Foot C ont r o l Top Remo v al / Installation (Non-Programmable)

A. Removal

(1) Disconnect coil cord (1, Figure 4-32) from table.

(2) Remove two screws (2) and strain relief

bracket (3).

(3) Remove four screws (4) and partially separate

foot control top (5) from foot control base (6).

(4) Disconnect coil cord (1) from PC board (7).

(5) Disconnect wire harness (8) from PC board (7)

and remove foot control top (5).

B. Installation

(1) Connect wire harness (8) to PC board (7).

(2) Connect coil cord (1) to PC board (7).

(3) Install foot control top (5) onto foot control

base (6) and secure with four screws (4).

(4) Place coil cord (1) into notch (A) of foot control

base (6); then install strain relief bracket (3) and secure with two screws (2).

Page 4-34

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MAINTENANCE / SERVICE

4.22 Foot C ont r o l Top Remo v al / Installation (Programmable)

A. Removal

(1) Disconnect coil cord (1, Figure 4-33) from table.

(2) Remove four screws (2), four screws (3) and

bottom cover (4).

(3) Remove two screws (5), and strain relief

bracket (6).

(4) Disconnect coil cord (1) from PC board (7).

(5) Disconnect wire harness (8) from PC board (7)

and remove foot control top (9) from foot control base (10).

B. Installation

(1) Connect wire harness (8) to PC board (7).

(2) Install foot control top (9) onto foot control

base (10) and secure with four screws (2).

(3) Connect coil cord (1) to PC board (7).

(4) Place coil cord (1) into notch (A) of foot control

base (10); then install strain relief bracket (6) and secure with two screws (5).

(5) Install bottom cover (4) and secure with four

screws (3).

4.23 Foot Control PC Board Removal / Installation

A. Removal

(1) Remove foot control top. (Refer to para 4.21

4.22).

MIDMARK

Figure 4-33 . Foo t Co nt rol Top

Removal / Inst a llation (Programmable)

MA495300

(2) Disconnect three wire harnesses (1, Figure

4-34) from PC board (2).

MIDMARK

MA495400

Figure 4-34 . Foot C ontrol PC Board

Removal / Insta llation

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SECTION IV

MAINTENANCE / SERVICE

(3) Remove four screws (3) and PC board (2) from

foot control top (4).

B. Installation

(1) Install PC board (2) and secure to foot control

top (4) with four screws (3).

(2) Connect three wire harnesses (1) to PC

board (2).

(3) Install foot control top. (Refer to para 4.21

4.22).

4.24 Typical Foot Control

Foot Pedal

Switch Removal / Installation

A. Removal

(1) Remove foot control top. (Refer to para 4.21

4.22).

(2) Remove four screws (1, Figure 4-35), two

pedal caps (2), foot control pedal (3) and two springs (4) from foot control base (5).

(3) Tag switch lead (6) with position; then using an

instrument with a sharp point, gently depress release tab (A) and pull lead from wire harness connector (7). Repeat this procedure for the second switch lead.

(4) Remove two screws (8) and switch cover (9).

(5) Pull two switch leads (6) thru hole (B).

(6) Remove nut (10), lockwasher (11) and

switch (12) from foot control base (5).

B. Installation

Figure 4-35 . Foot C ontrol

Removal / Insta llation

(3) Check release tabs (A) of two switch leads (6).

If they are not angled upward slightly as shown, use a small tool to bend them upward.

(4) Insert switch leads (6) into wire harness con-

nector (7), making sure each release tab (A) of lead is oriented so it will latch securely into place. Very gently pull on switch leads to ensure they are secure.

Foot P edal

MA495500

Switch

EQUIPMENT ALE RT

The soldered connections at the switch are

very delicate. Use caution when tightening nut (10). Failure to do so could result in broken connections at the switch.

(1) Install switch (12) into foot control base (5) and

secure with lockwasher (11) and nut (10).

(2) Feed two switch leads (6) up thru hole (B).

Page 4-36

(5) Install switch cover (9) and secure with two

screws (8).

(6) Install two springs (4), foot control pedal (3)

and two pedal caps (2) and secure with four screws (1).

(7) Install foot control top. (Refer to para 4.21

4.22).

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4.25 Typical Foot Control Function Button Switch Remov al / Installat ion

A. Removal

(1) Remove foot control top. (Refer to para 4.21

4.22).

(2) Remove four screws (1, Figure 4-36) and par-

tially separate PC board (2) from foot control top (3).

NOTE

Be sure to trace switch leads from faulty switch to proper wire harness connector at PC board.

(3) Disconnect wire harness connector (4) from

PC board (2).

(4) Tag switch lead (5) with position; then using an

instrument with a sharp point, gently depress release tab (A) of switch lead and pull switch lead out of wire harness connector. Repeat this procedure for second switch lead.

(5) Remove nut (6), lockwasher (7) and

switch (8) from foot control top (3).

B. Installation

EQUIPMENT ALE RT

The soldered connections at the switch are

very delicate. Use caution when tightening nut (6). Failure to do so could result in broken connections at the switch.

(1) Install switch (8) into foot control top (3) and

secure with lockwasher (7) and nut (6).

(2) Check release tabs (A) of two switch leads (5).

If they are not angled upward slightly as shown, use a small tool to bend them upward.

MIDMARK

Figure 4-36 . Typical Foot Co nt rol Function Button

Switch Remo v a l / Install ati on .

MA495600

(3) Insert two switch leads (5) into wire harness

connector (4), making sure each release tab (A) is oriented so it will latch securely into place. Very gently pull on switch leads to ensure they are secure.

(4) Connect wire harness connector (4) to PC

board (2).

(5) Secure PC board (2) to foot control top (3) with

four screws (1).

(6) Install foot control top. (Refer to para 4.21

4.22).

4.26 T ypical Foot Control Lamp Removal / Installation (Programmable)

A. Removal

(1) Remove foot control top. (Refer to para 4.21

4.22).

(2) Remove bulb socket (1, Figure 4-37) from foot

control top (2).

(3) Remove bulb (3) from bulb socket (1).

Page 4-37

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SECTION IV MAINTENANCE / SERVICE

MIDMARK

Figure 4-37. Typical Foot Control Lamp

Removal / Installation

B. Installation

(1) Install bulb (3) into bulb socket (1).

(2) Insert bulb socket (1) thru hole in foot control

top (2).

(3) Install foot control top. (Refer to para 4.21

4.22).

MA495700

Figure 4-38. Headrest Assembly

Removal / Insta llation

(6) Remove two screws (8); then separate

spring housing (9) from pin housing (10).

(7) Remove stop pin(s) (11) and spring(s) (12).

B. Installation

NOTE

Be sure to lubricate stop pins with silicone based lubricant or white lithium grease before installing.

4.27 Headrest Assembly Stop Pin Removal / Installation

A. Removal

(1) Pull headrest assembly (1, Figure 4-38) out of

headrest slide mechanism (2).

(2) Remove two knobs (3) and headrest

upholstery (4).

(3) Loosen two set screws (1, Figure 4-39) and

remove two pin stop blocks (2).

(4) Remove two pivot pins (3).

(5) Push release button (4) and remove

headrest housing (5) and tang weldment (6) from pin/spring housing assembly (7).

Page 4-38

(1) Insert stop pin(s) (11) thru pin housing assem-

bly (10); then install spring(s) (12) onto stop pin(s).

(2) Install spring housing (9) onto pin housing (10)

making sure springs (12) and stop pins (11) align with holes in spring housing.

NOTE

Before tightening screws (8), use pivot pins (3) to align spring housing (9) with pin housing (10). Be sure stop pins (11) move freely after tightening screws (8).

(3) Secure spring housing (9) to pin housing (10)

with two screws (8).

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SECTION IV

MAINTENANCE / SERVICE

(4) Push release button (4) to retract stop pins (11);

then slide pin/spring housing assembly (7) into tang weldment (6).

NOTE

When installing pin stop block, be sure to align hole in pin stop block with set screw.

(5) Insert pivot pin (3) thru tang weldment (6) and

pin/spring housing assembly (7); then install pin stop block (2).

(6) Hold pin stop block (2) so that it is flush with

tang weldment (9); then tighten set screw (1).

(7) Push release button (4) to retract stop pins (11);

then slide headrest housing (5) over pin / spring housing assembly (7).

NOTE

When installing pin stop block, be sure to align hole in pin stop block with set screw.

(9) Hold pin stop block (2) so that it is flush with

headrest housing (5); then tighten set screw (1).

NOTE

To ensure stop pins are seated correctly, hold release button and rotate each pivot point back and forth several times before installing headrest assembly.

(10) Install headrest upholstery (4, Figure 4-38) and

secure with two knobs (3).

(11) Insert headrest assembly (1) into headrest slide

mechanism (2).

4.28 Headrest Slide Mechanism Adjustment

A. To

decrease

anism, adjust as follows:

(1) Loosen screw (1, Figure 4-40) until desired fric-

tion setting is achieved.

friction setting of headrest slide mech-

(8) Insert pivot pin (3) thru headrest housing (5)

and pin/spring housing assembly (7); then install pin stop block (2).

B. To

increase

nism, adjust as follows:

(1) Tighten screw (1) until desired friction setting is

achieved.

friction setting of headrest slide mecha-

Figure 4-39. Headrest Assembly Stop Pin

Removal / Insta llation

Page 4-39

Figure 4-40. Headrest Slide Mechanism Adjustment

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SECTION IV MAINTENANCE / SERVICE

4.29 Arm Rest Locking Mechanism Removal / Installation

A. Removal

(1) Remove two knobs (1, Figure 4-41) and arm

pad (2).

(2) Remove screw (3) and upholstery mount (4)

from arm weldment (5).

(3) Remove three screws (6), arm boss (7), and

knob assembly (8) from upholstery mount (4).

(4) Remove knob (9), flanged bushing (10),

spring (11), and index plunger (12) from knob assembly (8).

B. Installation

(1) Slide spring (11), and flanged bushing (10) onto

index plunger (12); then install knob (9).

NOTE

When aligning arm boss with index pin, be sure countersink in center of arm boss is facing outward.

(2) Insert knob assembly (8) thru upholstery

mount (4); then align index hole in arm boss (7) with index plunger (12).

(3) Coat threads of three screws (6) with remove-

able threadlocking adhesive (Loctite 262).

(4) Secure arm boss (7) to upholstery mount (4)

with three screws (6).

(5) Coat threads of screw (3) with removeable

threadlocking adhesive (Loctite 262).

(6) Install upholstery mount (4) onto arm

weldment (5) and secure with screw (3).

(7) Install arm pad (2) and secure with two

knobs (1).

4.30 Back Slide Bearing Removal / Installation

A. Removal

(1) Raise back section to its maximum height.

(2) Remove headrest assembly (1, Figure 4-42).

(3) Remove two knobs (2) and back section

upholstery (3).

(4) Remove four bolts (4), four screws (5), slide

retainer (6), sliding cover assembly (7).

(5) Lower back section to its minimum height.

NOTE

If sliding back weldment contacts link pistons (11) when performing the following step, raise back section slightly.

Figure 4-41. Arm Rest Locking Mechanism

Removal / Installation

B. Installation

Page 4-40

(6) Pull sliding back weldment (8) toward head end

of table and remove from back weldment (9).

(7) Remove four back slide bearings (10) from back

weldment (9).

(1) Insert four back slide bearings (10) into notches

on back weldment (9).

NOTE

It may be necessary to raise back section slightly in order to rotate link pistons.

(2) Rotate two link pistons (11) so that sliding back

weldment (8) will not contact link pins (12) when installed.

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SECTION IV

MAINTENANCE / SERVICE

(3) Install sliding back weldment (8) onto back

weldment (9) so that link pistons (11) are visible thru two holes (A) in sliding back weldment.

WARNING

Sliding back weldment is heavy and will

slide down quickly if not held securely during the following step. Use an assistant if necessary when performing the following steps. Failure to comply could result in serious personal injury .

(4) While supporting sliding back weldment (10),

depress BACK UP button on hand control until the two link pistons (11) raise thru the holes (A) in sliding back weldment. Continue to raise back section while moving sliding back weldment up (keep link pistons aligned with holes in sliding back weldment) until access to two link

pins (12) can be achieved.

(5) Hold sliding back weldment (8) in place; then

align two link pins (12), flat sides up, with four holes (B) in sliding back weldment (8) and secure with four bolts (4).

(6) Install sliding cover assembly (7) and secure

with two screws (5).

(7) Install slide retainer (6) and secure with two

screws (5).

(8) Install back section upholstery (3) and secure

with two knobs (2).

(9) Install headrest assembly (1).

4.31 Foot Rest Extension Limit Switch Removal / Installation

A. Removal

WARNING

Always disconnect the power cord from

(1) Unplug table power cord from wall outlet.

Figure 4-42. Back Slide Bearing Removal / Installation

Page 4-41

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SECTION IV MAINTENANCE / SERVICE

(2) Pull foot rest extension out as far as it will go.

(3) Remove four knobs (1, Figure 4-43) and foot

rest upholstery (2).

(4) Remove four screws (3) and foot weldment

cover (4) from foot section weldment (5).

(5) Tag and disconnect two wires (6) from terminals

of limit switch (7).

(6) Depress two tabs (A) and remove limit

switch (7) from limit switch bracket (8).

B. Installation

(1) Partially insert limit switch (7) thru hole in limit

switch bracket (8).

(2) Connect two wires (6) to proper terminals of

limit switch (7).

(3) Push limit switch (7) thru hole in limit switch

bracket (8) until it locks into place.

(4) Install foot weldment cover (4) and secure with

four screws (3).

(5) Install foot rest upholstery (2) and secure with

four knobs (1).

4.32 Foot Actuator Limit Switch Removal / Installation

A. Removal

(1) Raise foot section to its maximum height; then

place supports (A, Figure 4-44) under foot section.

(2) Remove two klip-rings (1) and clevis pin (2).

(3) Run FOOT DOWN function to retract foot actu-

ator (3) as far as it will go.

WARNING

Always disconnect the power cord from

(4) Unplug table power cord from wall outlet.

Figure 4-43. Foot Rest Extension Limit Switch

Remova l / Instal la tion

(5) Remove four knobs (4) and seat upholstery (5).

(6) Remove two screws (6) and electrical cover (7).

(7) Cut two wire ties (1, Figure 4-45); then tag and

disconnect two wires (2) from terminals of limit switch (3).

(8) Remove hole plug (4) and two klip-rings (5);

(9) Using a hammer and punch, drive clevis pin (6)

out thru hole (A).

(10) Remove nut (7) securing ground wire (8) to foot

actuator (9).

EQUIPMENT ALE RT

When performing the following step, do not

attempt to completely remove actuator; some wires are still connected. Failure to comply will result in damage to the actuator and/or wiring connections.

Rev. 3/00

Page 4-42

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SECTION IV

MAINTENANCE / SERVICE

(2) Insert shaft end of foot actuator (9) thru hole in

seat weldment (10).

(3) Install clevis pin (6) and secure with two klip-

rings (5); then install hole plug (4).

(4) Connect two wires (2) to proper terminals of

limit switch (3).

(5) Secure ground wire (8) to foot actuator (9) with

nut (7); then bundle wires and secure with two wire ties (1).

(6) Install electrical cover (7, Figure 4-44), but do

not secure at this time.

(7) Plug table power cord into wall outlet.

(8) Run FOOT UP function to extend foot

actuator (3) until actuator shaft aligns with foot section weldment (8).

Figure 4-44. Foot Actuator Limit Switch

Removal / Installation

(11) Pull shaft end of foot actuator (9) thru hole in

seat weldment (10) and rotate actuator to access bottom of limit switch bracket (11).

(12) Remove two screws (12), two nuts (13), and

limit switch (3) from limit switch bracket (11).

B. Installation

EQUIPMENT ALE RT

If the limit switch is postioned too far

toward the head end of the limit switch bracket, the foot section will move lower than 40° below horizontal before limit switch is tripped. When the Base and Tilt funtions are in their lowest positions, this can allow the foot section to collide with the floor. Use a protractor to ensure the limit switch is tripped when the foot section is 40° below horizontal. Failure to comply could result in damage to the accessories or the table.

(1) Install limit switch (3) onto limit switch

bracket (11) and secure with two screws (12) and two nuts (13).

Figure 4-45. Foot Actuator Limit Switch

Removal / Installation

Rev. 3/00

Page 4-43

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(9) Install clevis pin (2) thru foot actuator (3) and

foot section weldment (8); then secure clevis pin with two klip-rings (1).

(10) Check for proper operation. (Refer to steps 4

thru 7 of Operational Test, para 2.1). Reposition limit switch (3, Figure 4-45) on limit switch bracket (11) if necessary.

(11) Secure electrical cover (7, Figure 4-44) with two

screws (6).

(12) Install seat upholstery (5) and secure with four

knobs (4).

4.33 Base Actuator Limit Switch Removal / Installation

A. Removal

(1) Raise BASE UP function all the way up.

WARNING

Always disconnect the power cord from

(2) Unplug table power cord from outlet receptacle.

(3) Remove four screws (1, Figure 4-46) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

Figure 4-46. Base Shrouds Removal / Installation

Rev. 3/00

Page 4-44

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Figure 4-47. Base Actuator Limit Switch Removal / Installation

(4) Remove four screws (4) and R.H. and L.H. mid-

dle shrouds (5).

(5) Disconnect two modular cords (6) from two inlet

PC boards (7).

(6) Remove four screws (8),and four screws (9);

then partially remove R.H. and L.H. inner shrouds (10) from base casting (11).

(7) Cut wire tie (1, Figure 4-47); then disconnect

wire harness (2) from terminals of limit switch (3).

(8) Remove two screws (4), two nuts (5), and limit

switch (3) from limit switch bracket (6).

B. Installation

(1) Install limit switch (3) on limit switch

bracket (6) and secure with two screws (4) and two nuts (5).

(2) Connect wire harness (2) to terminals of limit

switch (3).

(3) Install R.H. and L.H. inner shrouds (10, Figure

4-46) on base casting (11) and secure with four screws (9), and four screws (8).

(4) Connect two modular cords (6) to two inlet PC

boards (7).

(5) Assemble R.H. and L.H. middle shrouds (5)

around inner shrouds (10) and secure with four screws (4).

(6) Install tabs (A) of R.H. and L.H. outer

shrouds (2) in slots (B) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (5) is captured by R.H. and L.H. outer shrouds (2).

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4.34 AC Receptacle Removal / Installation Removal

WARNING

Always disconnect the power cord from

A. Removal

(1) Remove two screws (1, Figure 4-48) and PC

board cover (2) from base casting (3).

(2) Loosen two terminal screws (4); then tag and

disconnect two wires (5) from terminals of PC board (6).

(3) Remove screw (7) and ground wire (8) from

base casting (3).

WARNING

The table weighs 515 lbs. (233 kgs).

You will need an assistan t to perform the following step. Failure to comply could result in serious personal injury or back strain.

EQUIPMENT ALE RT

Remove chair arms and any accessories

attatched to the table. Failure to comply could result in damage to the accessories or the table.

(4) Lay table on its side.

(5) Remove two screws (9) and power inlet

bracket (10) from bottom of base casting (3).

(6) Tag and disconnect two wires (1, Figure 4-49)

and ground wire (2) from terminals of AC receptacle (3).

Figure 4-48. Power Inlet Bracket

Removal / Installation

B. Installation

(1) Insert AC receptacle (3) thru hole in power inlet

bracket (4); then push inward until it locks into place.

(2) Connect two wires (1) and ground wire (2) to

proper terminals of AC receptacle (3).

(3) Install power inlet bracket (10, Figure 4-48) on

bottom of base casting (3) and secure with two screws (9).

WARNING

The table weighs 515 lbs. (233 kgs).

You will need an assistant to perform the following step. Failure to comply could result in serious personal injury or back strain.

(7) Disconnect two wires (1, Figure 4-49) and

ground wire (2) from AC receptacle (3).

(8) Depress tabs (A); then remove AC

receptacle (3) from power inlet bracket (4).

Page 4-46

(4) Stand table upright.

(5) Secure ground wire (8) to base casting (3) with

screw (7).

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Figure 4-49. AC Receptacle Removal / Installation

(6) Connect two wires (5) to proper terminals of

PC board (6) and secure by tightening two terminal screws (4).

(7) Install PC board cover (2) on base casting (3)

and secure with two screws (1).

4.35 Fuse Holder Removal / Installation Removal

A. Removal

(1) Remove power inlet bracket. (Refer to:

Removal - steps 1 thru 5 of para 4.34).

(2) Tag and disconnect two wires (1, Figure 4-50)

from terminals of fuse holder (2).

(3) Remove nut (3), lockwasher (4), and fuse

holder (2) from power inlet bracket (5).

(4) Remove gasket (6) from fuse holder (2).

B. Installation

(1) Install gasket (6) on fuse holder (2).

Figure 4-50. Fuse Holder Removal / Installation

(4) Install power inlet bracket. (Refer to: Installa-

tion - steps 3 thru 7 of para 4.34).

4.36 Foot Rest Extension Latch Spring Removal / Installation

A. Removal

(1) Run FOOT UP function to its maximum height.

(2) Loosen screw (1, Figure 4-51); then squeeze

release handle (2) and remove foot slide weldment (3) from foot section weldment (4).

(3) Using a small flat-bladed screwdriver, pry latch

spring (5) from detent latch (6).

B. Installation

(1) Position top of latch spring (5) under detent

latch (6); then slide bottom of latch spring over alignment bump (A).

(2) Install foot slide weldment (3) into foot section

weldment (4); then install screw (1).

(2) Insert fuse holder (2) thru hole in power inlet

bracket (5) and secure with lockwasher (4) and nut (3).

(3) Connect two wires (1) to terminals of fuse

holder (2).

Rev. 3/00

Page 4-47

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Figure 4-51 . Foot R e st Lat ch Sp ri ng

Removal / Insta llation

4.37 Foot Position Sensor Remo val / Installation / Adjustment (Programmable Units Only)

A. Removal

(1) Run FOOT DOWN function all the way down.

(2) Unplug table power cord from outlet receptacle.

(3) Remove four knobs (1, Figure 4-52) and seat

upholstery (2).

(4) Remove two screws (3) and electrical cover (4).

(5) Disconnect foot sensor harness (5) from har-

ness (6); then pull foot sensor harness thru access hole (A) in seat weldment (7).

(6) Remove two screws (1, Figure 4-53) and foot

sensor cover (2) from position sensor mount (3).

Figure 4-52. Foot P osition Sensor

Removal / Inst a l la tion

(7) Using a T15 torx wrench, remove two

screws (4), backing plate (5), and foot position sensor (6) from position sensor mount (3).

(8) Remove 5/16” hex drive (7) from head of

screw (8).

B. Installation

(1) Remove two screws (9, Figure 4-53) and PC

board cover (10) from base casting (11).

NOTE

Use multimeter leads with testing hooks; it is very difficult to do with testing probes.

Page 4-48

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Figure 4-53. Foot Position Sensor Removal / I nstalla tion / Adjustment

Page 4-49

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SECTION IV MAINTENANCE / SERVICE

(2) Connect negative (black) lead of multimeter to

TP4 (A, Figure 4-53) and positive (red) lead of multimeter to TP7 (B) on PC control board (12).

(3) Set multimeter to VDC setting. Then, set the

voltage range of the multimeter to the 0-20 VDC range.

(4) Feed foot sensor harness (5, Figure 4-52) thru

access hole (A) in seat weldment (7).

(5) Connect foot sensor harness (5) to harness (6).

(6) Plug table power cord into outlet receptacle.

(7) Run FOOT UP function all the way up.

(8) Slide sensor holder tool (C, Figure 4-53) thru

the center hole of foot position sensor (6).

(9) Insert 5/16” hex drive (7) into slot of sensor

holder tool (C).

(10) Pull on sensor holder tool (C) until 5/16” hex

drive (7) is engaged with foot position sensor (6). Then, rotate sensor holder tool slightly to apply friction on 5/16” hex drive and prevent it from “popping” out as foot position sensor is installed. The 5/16” hex drive is properly engaged when spring tension is felt as the sensor holder tool is rotated. Also, the multimeter should read approximately 0.5 to 0.7 VDC and the reading should change as the tool is rotated.

(12) Coat threads of two screws (4) with removable

threadlocking adhesive (Loctite 242); then secure the foot position sensor (6) on position sensor mount (3) with backing plate (5) and two screws (4). Tighten screws very lightly, so that the foot position sensor may be rotated for adjustment, but do not let sensor pop out of mounting position.

(13) Pull sensor holder tool (C) from foot position

sensor (6).

(14) Rotate foot position sensor (6) until multimeter

reads approximately 0.50 VDC ± 0.2 VDC; then tighten two screws (4) to secure foot position sensor in place.

(15) Lower FOOT DOWN function all the way down

(until it freewheels) while observing the multimeter reading; the reading should increase steadily during the table movement. If the voltage reading stops increasing before the actuator reaches its end of travel and freewheels, the foot position sensor (6) has reached the dead spot at the end of its range. If this happens, return to step 14 and readjust the foot position sensor as determined necessary to eliminate the dead spot.

(16) Run FOOT UP function for approximately 1/10

second (the minimum amount of time the button can be pressed and still have the table move slightly). Then, run FOOT UP function all the way up and repeat step using the FOOT DOWN function.

EQUIPMENT ALE RT

Make sure the 5/16” hex drive remains in

position in foot position sensor while foot position sensor is being installed. If hex drive does not stay fully seated in foot position sensor, the foot position sensor can be damaged.

(11) While applying slight rotational pressure and

gentle back pressure on sensor holder tool (C) to keep 5/16” hex drive (7) in position, install foot position sensor (6) on position sensor mount (3). Move foot position sensor around as necessary while pushing foot position sensor inward until it is fully seated.

Rev. 3/00

Page 4-50

Observe.

The multimeter reading should change slightly; if it doesn’t change, then the foot position sensor (6) must be readjusted (it is in “dead spot” at end of travel).

(17) Run FOOT UP function all the way up (until foot

actuator freewheels). The multimeter reading should be approximately 0.50 VDC ±0.2 VDC and no dead spot should be observed. If not, repeat entire procedure.

(18) Remove multimeter leads from TP4 (A) and

TP7 (B) of PC control board (12).

(19) Install foot sensor cover (2) on seat weld-

ment (13) and secure with two screws (1).

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(20) Install electrical cover (4, Figure 4-52) and

secure with two screws (3).

(21) Install seat upholstery (2) and secure with four

knobs (1).

(22) Unplug table power cord from outlet receptacle.

(23) Depress and hold the PROGRAM / FAULT

CLEAR button (D, Figure 4-53) while simultaneously plugging the table power cord into the outlet receptacle.

Observe.

The PROGRAM MODE lamp and the FOOT REST EXTENSION lamp of the foot/ hand control will illuminate and then go out.

(24) After the PROGRAM MODE lamp and FOOT

REST EXTENSION lamp of the foot/hand control go out, release the PROGRAM / FAULT CLEAR button (D).

Observe.

After approximately 10 to 20 seconds, the PC control board (12) will sound three warning beeps to indicate the memory is cleared.

4.38 Tilt Position Sensor Removal / Installation / Adjustment (Programmable Units Only)

A. Removal

(1) Run BASE UP function all the way up.

(2) Remove four screws (1, Figure 4-54) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(3) Lower middle outer shroud assembly (4) down

out of way.

(4) Remove two nuts (5) and sensor wire cover (6)

from connection cover (7).

(5) Cut any cable ties (8) securing tilt sensor har-

ness (9) to other harnesses.

(6) Disconnect tilt sensor harness (9) from

harness (10).

(7) Run TILT DOWN function all the way down.

(25) Install PC board cover (10) on base casting (11)

and secure with two screws (9).

(26) Calibrate the PC control board (Refer to

para 4.2).

(27) Program the table and check for proper opera-

tion.

C. Adjustment Only

(1) Perform steps 6 thru 8 of para 4.37, Removal.

(2) Perform steps 1, 2, 3, 7 thru 19, and 22 thru 27

of para 4.37, Installation.

(8) Run BACK UP function all the way up.

(9) Unplug table power cord from outlet receptacle.

(10) Remove screw (1, Figure 4-55) and tilt sensor

cover (2) from column adapter weldment (3).

(11) Using a T15 torx wrench, remove two

screws (4), backing plate (5), and tilt position sensor (6) from position sensor mount (7).

(12) Remove 5/16” hex drive (8) from head of

screw (9).

B. Installation

(1) Remove two screws (10) and PC board

cover (11) from base casting (12).

NOTE

Use multimeter leads with testing hooks; it is very difficult to do with testing probes.

(2) Connect negative (black) lead of multimeter to

TP4 (A, Figure 4-55) and positive (red) lead of multimeter to TP8 (B) of PC control board (13).

Rev. 3/00

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SECTION IV MAINTENANCE / SERVICE

(3) Set multimeter to VDC setting. Then set the

voltage range of the multimeter to the 0-20 VDC range.

(4) Feed tilt sensor harness (9, Figure 4-54) thru

wire hole (A).

(5) Connect tilt sensor harness (9) to harness (10).

(6) Secure tilt sensor harness (9) to other har-

nesses with cable tie (8).

(7) Install sensor wire cover (6) on connection

cover (7) and secure with two nuts (5), making sure harnesses (9 and 10) are tucked into the sensor wire cover.

(8) Install tabs (B) of R.H. and L.H. outer

shrouds (2) in slots (C) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (4) is captured by R.H. and L.H. outer shrouds (2).

(9) Plug table power cord into outlet receptacle.

(10) Run TILT DOWN function all the way down.

(11) Slide sensor holder tool (C, Figure 4-55) thru

the center hole of tilt position sensor (6).

(12) Insert 5/16” hex drive (8) into slot of sensor

holder tool (C).

Figure 4-54 . Tilt Sensor Harnes s

Disconnection / Connection

(13) Pull on holder sensor tool (C) until 5/16” hex

drive (8) is engaged with tilt position sensor (6). Then, rotate sensor holder tool slightly to apply friction on 5/16” hex drive and prevent it from “popping” out as tilt position sensor is installed. The 5/16” hex drive is properly engaged when spring tension is felt as the sensor holder tool is rotated. Also, the multimeter should read approximately 0.04 to 0.08 VDC and the reading should change as the tool is rotated.

EQUIPMENT ALE RT

Make sure the 5/16” hex drive remains in

position in tilt position sensor while tilt position sensor is being installed. If hex drive does not stay fully seated in tilt position sensor, the tilt position sensor can be damaged.

(14) While applying slight rotational pressure and

gentle back pressure on sensor holder tool (C) to keep 5/16” hex drive (8) in position, install tilt position sensor (6) on position sensor mount (7). Move tilt position sensor around as necessary while pushing tilt position sensor inward until it is fully seated.

Rev. 3/00

Page 4-52

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Figure 4-55. Tilt Position Sensor Removal / Installation / Adjustment

Page 4-53

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(15) Coat threads of two screws (4) with removable

threadlocking adhesive (Loctite 242); then secure the tilt position sensor (6) on position sensor mount (7) with backing plate (5) and two screws (4). Tighten screws very lightly, so that the tilt position sensor may be rotated for adjustment, but do not let sensor pop out of mounting position.

(16) Pull sensor holder tool (C) from tilt position sen-

sor (6).

(17) Rotate tilt position sensor (6) until multimeter

reads 0.05 VDC ± 0.01 VDC; then tighten two screws (4) to secure tilt position sensor in place.

(18) Run TILT UP function all the way up (until tilt

actuator freewheels) while observing the multimeter reading; the reading should increase steadily during the table movement. If the voltage reading stops increasing before the tilt actuator reaches its end of travel and freewheels, the tilt position sensor (6) has reached the dead spot at the end of its range. If this happens, return to step 17 and readjust the tilt position sensor as determined necessary to eliminate the dead spot.

(19) Run TILT DOWN function for approximately

1/10 second (the minimum amount of time the button can be pressed and still have the table move slightly). Then, run TILT DOWN function all the way down and repeat step using the TILT UP function.

(21) Remove multimeter leads from TP4 (A) and

TP8 (B) of PC control board (13).

(22) Install tilt sensor cover (2) on column adapter

weldment (3) and secure with screw (1).

(23) Unplug table power cord from outlet receptacle.

(24) Depress and hold the PROGRAM / FAULT

CLEAR button (D) while simultaneously plugging the table power cord into the outlet receptacle.

Observe.

The PROGRAM MODE lamp and the FOOT REST EXTENSION lamp of the foot/ hand control will illuminate and then go out.

(25) After the PROGRAM MODE lamp and FOOT

REST EXTENSION lamp of the foot/hand control go out, release the PROGRAM / FAULT CLEAR button (D).

Observe.

After approximately 10 to 20 seconds, the PC control board (13) will sound three warning beeps to indicate the memory is cleared.

(26) Install PC board cover (11) on base casting (12)

and secure with two screws (10).

(27) Calibrate the PC control board (Refer to

para 4.2).

(28) Program the table and check for proper opera-

tion.

Observe.

The multimeter reading should change slightly; if it doesn’t change, then the tilt position sensor (6) must be readjusted (it is in “dead spot” at end of travel).

(20) Run the TILT DOWN function all the way down

(until tilt actuator freewheels). The multimeter reading should be approx. 0.05 VDC ±0.01 VDC and no dead spot should be observed. If not, repeat entire procedure.

Rev. 3/00

C. Adjustment Only

4.39 Back Position Sensor Removal /

A. Removal

Page 4-54

(1) Perform steps 7 thru 12 of para 4.38, Removal.

(2) Perform steps 1, 2, 3 and 9 thru 28 of para 4.38,

Installation.

Installation / Adjustment (Programmable Units Only)

(1) Run BACK UP function all the way up.

(2) Unplug table power cord from outlet receptacle.

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(3) Remove four knobs (1, Figure 4-56) and seat

upholstery (2).

(4) Remove two screws (3) and electrical cover (4).

(5) Cut cable tie (5) securing back sensor

harness (6) to seat weldment (7).

(6) Disconnect back sensor harness (6) from har-

ness (8); then pull back sensor harness out thru access hole (A).

(7) Remove screw (1, Figure 4-57) and back sen-

sor cover (2) from seat weldment (3).

(8) Using a T15 torx wrench, remove two

screws (4), backing plate (5), and back position sensor (6) from position sensor mount (7).

(9) Remove 5/16” hex drive (8) from head of

screw (9).

SECTION IV

MAINTENANCE / SERVICE

B. Installation

(1) Remove two screws (10) and PC board

cover (11) from base casting (12).

NOTE

Use multimeter leads with testing hooks; it is very difficult to do with testing probes.

(2) Connect negative (black) lead of multimeter to

TP4 (A, Figure 4-57) and positive (red) lead of multimeter to TP9 (B) of PC control board (13).

(3) Set multimeter to VDC setting. Then set the

voltage range of the multimeter to the 0-20 VDC range.

(4) Feed back sensor harness (6, Figure 4-56) thru

access hole (A) in seat weldment (7).

(5) Connect back sensor harness (6) to

harness (8).

(6) Secure back sensor harness (6) to seat weld-

ment (7) with cable tie (5).

(7) Install seat upholstery (2) and secure with four

knobs (1).

(8) Plug table power cord into outlet receptacle.

Figure 4-56. Back Sensor Harness

Disconnection / Connection

(9) Run BACK DOWN function all the way down.

(10) Slide sensor holder tool (C, Figure 4-57) thru

the center hole of back position sensor (6).

(11) Insert 5/16” hex drive (8) into slot of sensor

holder tool (C).

(12) Pull on holder sensor tool (C) until 5/16”

hex drive (8) is engaged with back position sensor (6). Then, rotate sensor holder tool slightly to apply friction on 5/16” hex drive and prevent it from “popping” out as back position sensor is installed. The 5/16” hex drive is properly engaged when spring tension is felt as the sensor holder tool is rotated. Also, the multimeter

Rev. 3/00

Page 4-55

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SECTION IV MAINTENANCE / SERVICE

should read approximately 0.5 to 0.7 VDC and the reading should change as the tool is rotated.

EQUIPMENT ALE RT

Make sure the 5/16” hex drive remains in

position in back position sensor while back position sensor is being installed. If hex drive does not stay fully seated in back position sensor, the back position sensor can be damaged.

(13) While applying slight rotational pressure and

gentle back pressure on sensor holder tool (C) to keep 5/16” hex drive (8) in position, install back position sensor (6) on position sensor mount (7). Move back position sensor around as necessary while pushing back position sensor inward until it is fully seated.

(14) Coat threads of two screws (4) with removable

threadlocking adhesive (Loctite 242); then secure the back position sensor (6) on position sensor mount (7) with backing plate (5) and two screws (4). Tighten screws very lightly, so that the back position sensor may be rotated for adjustment, but do not let sensor pop out of mounting position.

(15) Pull sensor holder tool (C) from back position

sensor (6).

BACK UP function.

Observe.

The multimeter reading should change slightly; if it doesn’t change, then the tilt position sensor (6) must be readjusted (it is in “dead spot” at end of travel).

(19) Run the BACK DOWN function all the way

down (until back actuator freewheels). The multimeter reading should be approximately

0.50 VDC ±0.2 VDC and no dead spot should be observed. If not, repeat entire procedure.

(20) Remove multimeter leads from TP4 (A) and

TP9 (B) of PC control board (13).

(21) Run BACK UP function all the way up.

(22) Install back sensor cover (2) on seat weld-

ment (3) and secure with screw (1).

(23) Unplug table power cord from outlet receptacle.

(24) Depress and hold the PROGRAM / FAULT

CLEAR button (D) while simultaneously plugging the table power cord into the outlet receptacle.

Observe.

The PROGRAM MODE lamp and the FOOT REST EXTENSION lamp of the foot/ hand control will illuminate and then go out.

(16) Rotate back position sensor (6) until multimeter

reads approximatley 0.50 VDC ± 0.2 VDC; then tighten two screws (4) to secure back position sensor in place.

(17) Run BACK UP function all the way up (until it

freewheels) while observing the multimeter reading; the reading should increase steadily during the table movement. If the voltage reading stops increasing before the actuator reaches its end of travel and freewheels, the back position sensor (6) has reached the dead spot at the end of its range. If this happens, return to step 16 and readjust the back position sensor as determined necessary to eliminate the dead spot.

(18) Run BACK DOWN function for approximately

1/10 second (the minimum amount of time the button can be pressed and still have the table move slightly). Then, run BACK DOWN function all the way down and repeat step using the

(25) After the PROGRAM MODE lamp and FOOT

REST EXTENSION lamp of the foot/hand control go out, release the PROGRAM / FAULT CLEAR button (D).

Observe.

After approximately 10 to 20 seconds, the PC control board (13) will sound three warning beeps to indicate the memory is cleared.

(26) Install PC board cover (11) on base casting (12)

and secure with two screws (10).

(27) Calibrate the PC control board (Refer to

para 4.2).

(28) Program the table and check for proper opera-

tion.

Rev. 3/00

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Figure 4-57. Back Position Sensor Removal / Installation / Adjustment

Page 4-57

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C. Adjustment Only

(1) Perform steps 1, 2, 7, 8, and 9 of para 4.39,

Removal.

(2) Perform steps 1, 2, 3 and 8 thru 28 of para 4.39,

Installation.

4.40 Base Position Sensor Removal / Installation / Adjustment (Programmable Units Only)

A. Removal

(1) Run BASE UP function all the way up.

(2) Unplug table power cord from outlet receptacle.

(3) Remove four screws (1, Figure 4-58) and R.H.

and L.H. outer shrouds (2) from column adapter weldment (3).

(4) Remove four screws (4) and R.H. and L.H. mid-

dle shrouds (5).

(5) Disconnect one modular cord (6) from each

inlet PC board (7).

(6) Remove four screws (8), four screws (9)

and partially remove R.H. and L.H. inner shrouds (10) from base casting (11).

(7) Cut cable tie (1, Figure 4-59) securing base

sensor harness (2) to capacitor strap (3).

(8) Disconnect base sensor harness (2) from

harness (4).

(9) While holding cable (5), remove two screws (6)

and cable clamp (7) from cable bracket (8).

(10) Unloop end of cable (5) from around grommet

bumper (9) and then slowly release tension from cable.

Figure 4-58. Base Shrouds Removal / Installation

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SECTION IV

MAINTENANCE / SERVICE

(11) Remove two screws (10) and base reducer

assembly (11) from column assembly (12).

DANGER

Use care when removing the torsion

spring. The torsion spring is under tension and can become a projectile if not controlle d. Failure to do so could result in serious personal injury to face or eyes.

(12) Remove circular push-on (1, Figure 4-60) and

torsion spring (2) from gear shaft (3).

(13) Remove two screws (4) and base position sen-

sor (5) from gear shaft (3).

B. Installation

(1) Remove two screws (13, Figure 4-59) and PC

board cover (14) from base casting (15).

NOTE

Use multimeter leads with testing hooks; it is very difficult to do with testing probes.

(8) If installing new cable (6), loosen screw (7) and

remove old cable. Then, wrap one end of new cable (6) around screw (7) 1-1/2 times and secure in this place by tightening screw. Cut off any excess cable (6).

(9) Install base reducer assembly (11, Figure 4-56)

on column assembly (12) and secure with two screws (10).

(10) Rotate pulley (8, Figure 4-60) in a clockwise

direction until resistance is met. Then, check position of screw (7); it should be ± 30° of the position shown on illustration. If not, remove screw (9), remove and rotate pulley (8) to correct orientation, and then reinstall with screw (9).

(11) Connect base sensor harness (2, Figure 4-59)

to harness (4).

(12) Secure base sensor harness (2) to capacitor

strap (3) with a cable tie (1).

(13) Plug table power cord into outlet receptacle.

(2) Connect negative (black) lead of multimeter to

TP4 (A, Figure 4-56) and positive (red) lead of multimeter to Test Point (B) of PC control board (16).

(3) Set multimeter to VDC setting. Then set the

voltage range of the multimeter to the 0-20 VDC range.

(4) Coat threads of two screws (4, Figure 4-60)

with removable threadlocking adhesive (Loctite

242).

(5) Install base position sensor (5) on gear shaft (3)

and secure with two screws (4).

(6) Install torsion spring (2) in slot (A) on end of

gear shaft (3) while pushing tab (B) of torsion spring under head of screw (4).

(7) Secure torsion spring (2) on gear shaft (3) with

circular push-on (1).

(14) Wrap cable (5) around pulley (C) three times in

direction shown.

NOTE

The BASE UP function must be completely raised before performing the following step.

(15) While observing the multimeter reading,

wrap free end of cable (5) around grommet bumper (9). Continue to pull cable until multimeter reading does not change (base position sensor is saturated- approximately 4.61 VDC.)

(16) Slowly release cable (5) until the voltage read-

ing starts to decrease (base position sensor is no longer in saturation - approximately 4.58 VDC). Then, making sure cable (5) is wrapped around grommet bumper 1-1/2 times, secure cable on grommet bumper by installing cable clamp (7) and two screws (6).

(17) Run BASE DOWN function all the way down

(until base down limit switch stops the base actuator) while observing the multimeter reading; the reading should decrease steadily during the table movement. If the voltage reading stops decreasing before the base actuator is

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SECTION IV MAINTENANCE / SERVICE

Figure 4-59. Base Reducer Assembly Removal / Installation

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30°

SECTION IV

MAINTENANCE / SERVICE

30°

Figure 4-60. Base Position Sensor Removal / Insallation

stopped by the base down limit switch, the base position sensor was installed incorrectly, the cable (5) is loose, or the base position sensor has reached a dead spot at the end of its range. If this happens, return to step 16 and readjust the base position sensor as determined necessary to eliminate the dead spot.

(18) Run the BASE UP function all the way Up (until

base down limit switch stops the base actuator). The multimeter reading should match the reading observed in step 16 and no dead spot should be observed. If not, repeat entire procedure.

(19) Cut off any excess cable (5) length.

(23) Install tabs (A) of R.H. and L.H. outer

shrouds (10) in slots (B) of column adapter weldment (3) and secure with four screws (1), making sure middle outer shroud assembly (5) is captured by R.H. and L.H. outer shrouds (2).

(24) Remove multimeter leads from TP4 (A,

Figure 4-59) and Test Point (B) of PC control board (16).

(25) Unplug table power cord from outlet receptacle.

(26) Depress and hold the PROGRAM / FAULT

CLEAR button (D, Figure 4-59) while simultaneously plugging the table power cord into the outlet receptacle.

MA370600

(20) Install R.H. and L.H. inner shrouds (10, Figure

4-58) on base casting (11) and secure with four screws (9), and four screws (8).

(21) Connect one modular cord (6) to each inlet PC

board (7).

(22) Assemble R.H. and L.H. middle shrouds (5)

around inner shrouds (10) with four screws (4).

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Page 4-61

Observe.

the FOOT REST EXTENSION lamp of the foot/ hand control will illuminate and then go out.

(27) After the PROGRAM MODE lamp and FOOT

REST EXTENSION lamp of the foot/hand control go out, release the PROGRAM / FAULT CLEAR button (D).

The PROGRAM MODE lamp and

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SECTION IV MAINTENANCE / SERVICE

Observe.

After approximately 10 to 20 seconds, the PC control board (16) will sound three warning beeps to indicate the memory is cleared.

(28) Install PC board cover (14) on base casting (15)

and secure with two screws (13).

(29) Calibrate the PC control board (Refer to

para 4.2).

(30) Program the table and check for proper opera-

tion.

C. Adjustment

(1) Perform steps 1 thru 6 of para 4.40, Removal.

(2) Loosen two screws (6, Figure 4-59).

(3) Perform steps 1, 2, 3 and 15 thru 30 of para

4.40, Installation.

Page 4-62

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Midmark 419, 419-003, 419-004, 419-005, 419-006 Parts Manual

Specifications and Main Features

Frequently Asked Questions

User Manual