Midark 419 Service manual

419
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Style B
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
SF-1604 Part No. 004-0249-00 Rev. J (01/19/12)
419
-011 thru
-006
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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.
© Midmark Corporation 1999 SF-1604 Page i Printed in U.S.A.
Rev. 2/02
TABLE OF CONTENTS
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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.
© Midmark Corporation 1999 SF-1604 Page ii Printed in U.S.A.
Rev. 7/03
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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 for 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 result 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.
© Midmark Corporation 1999 SF-1604
Page iii
Printed in U.S.A.
TABLE OF CONTENTS
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© Midmark Corporation 1999 SF-1604
Page iv
Printed in U.S.A.
SECTION I
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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
© Midmark Corporation 1999 SF-1604
Rev. 2/00
Page 1-1
Printe d in U.S .A.
SECTION I
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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
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
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
TILT
BASE UP
CHAIN
ASSEMBLY
HAND INLET
PC BOARD
BACK
POSITION
SENSOR
HAND
CONTROL
HAND
HAND
CONTROL
MA523501
© Midmark Corporation 1999 SF-1604 Page 1-2 Printed in U.S.A.
Rev. 2/02
Figure 1-1. Major Components
SECTION I
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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
© Midmark Corporation 1999 SF-1604
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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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 Table Theory of Operation (Se e
Figures 5-1 thru 5-6 for wiring diagram / electri­cal schematic) (Applies only to tables with pro­grammed posit ioning)
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.
© Midmark Corporation 1999 SF-1604
Rev. 2/00
Page 1-4
Printe d in U.S .A.
SECTION I
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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
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.
limit switch circuits must be
open
), the PC
© Midmark Corporation 1999 SF-1604
Page 1-5
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SECTION I
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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)
© Midmark Corporation 1999 SF-1604 Page 1-6 Printed in U.S.A.
Rev. 2/02
SECTION I
Return To Table Of Contents
GENERAL INFORMATION
Dbl. Articulating Headrest 76" (193.0cm) Triple Articulating Headrest 80" (203.2 cm)
65
"
(165.1 cm)
23"
58.4
(
(TABLE
cm)
)
40"
(+/- 5")
(101.6 cm)
(MAX.)
22"
(+/- 5")
(55.9 cm)
(MIN.)
8"
(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
© Midmark Corporation 1999 SF-1604 Page 1-7 Printed in U.S.A.
Rev. 2/02
SECTION I
MA520001i
MODEL
NUMBER
SERIAL
NUMBER
Return To Table Of Contents
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
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
© Midmark Corporation 1999 SF-1604 Page 1-8 Printed in U.S.A.
Rev. 2/03
TESTING AND TROUBLESHOOTING
Return To Table Of Contents
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°
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
© Midmark Corporation 1999 SF-1604 Page 2-1 Printed in U.S.A.
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
SECTION II
Return To Table Of Contents
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.
© Midmark Corporation 1999 SF-1604 Page 2-2 Printed in U.S.A.
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.
SEAT
Return To Table Of Contents
SECTION
180
SECTION II
TESTING AND TROUBLESHOOTING
HEADREST
RELEASE
BUTTON/HANDLE
o
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
UP
BACK DOWN
BACK
FUNCTION
I
AR M
BUTTON
AND LAMP
TILT
DOWN
TABLE DOWN
UP
FOOT REST EXTENSION
LAMP
FOOT
UP
FOOT
DOWN
TABLE
UP
FOOT
PEDAL
© Midmark Corporation 1999 SF-1604 Page 2-3 Printed in U.S.A.
Rev. 2/02
Figure 2-1. Operational Test (Sheet 1 of 2)
SECTION II
Return To Table Of Contents
TESTING AND TROUBLESHOOTING
180
SEAT
SECTION
HEADREST
RELEASE
BUTTON/HANDLE
o
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
P
2
1
MA
R D MI
TABLE
FUNCTION
BUTTON
AND LAMP
POSITION
BUTTONS
3
4
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
UP
TILT
UP
ARMREST
KNOB
FOOT REST EXTENSION
LAMP
FOOT
UP
FOOT
DOWN
TABLE
UP
PROGRAM
POSTION
BUTTONS
PROGRAM
MODE LAMP
Figure 2-1. Programmable Units Operational Test (Sheet 2 of 2)
© Midmark Corporation 1999 SF-1604 Page 2-4 Printed in U.S.A.
Rev. 2/02
SECTION II
Return To Table Of Contents
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.
© Midmark Corporation 1999 SF-1604
Page 2-5
Printe d in U.S .A.
Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
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.
© Midmark Corporation 1999 SF-1604
Page 2-6
Printe d in U.S .A.
Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
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.
© Midmark Corporation 1999 SF-1604
Page 2-7
Printe d in U.S .A.
Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
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.
© Midmark Corporation 1999 SF-1604
Page 2-8
Printe d in U.S .A.
Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
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.
© Midmark Corporation 1999 SF-1604
Page 2-9
Printe d in U.S .A.
Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
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.
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.
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 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.
© Midmark Corporation 1999 SF-1604
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Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
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).
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 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.
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 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.
© Midmark Corporation 1999 SF-1604
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Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
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.
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.
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.
© Midmark Corporation 1999 SF-1604
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Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
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 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.
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.
© Midmark Corporation 1999 SF-1604
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Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
The Troubleshooting Guide entries belo w apply onl y 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.
© Midmark Corporation 1999 SF-1604
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Problem Symptom Probable Cause Check Correction
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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.
© Midmark Corporation 1999 SF-1604
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Problem Symptom Probable Cause Check Correction
Return To Table Of Contents
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.
© Midmark Corporation 1999 SF-1604
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