Midmark 417-001, 417, 417-003 Parts Manual

417

-001 thru -003

Power Podiatry Treatment Table

Serial Number Prefixes: BP, EP & V

Service and

Parts Manual

417

-001 thru

-003

FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

SF-1399 Part No. 003-0709-00 Rev. R (11/25/09)

TABLE OF CONTENTS

Section/Paragraph Page Section/Paragraph Page

IMPORTANT INSTRUCTIONS

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

Warnings ..................................................................... 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 417 Power Podiatry

Treatment Chair ....................................... 1-1

1.4 Specifications ............................................. 1-5

1.5 Parts Replacement Ordering ....................... 1-5

1.6 Special Tools .............................................. 1-6

SECTION II TESTING AND TROUBLESHOOTING

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

2.2 Troubleshooting Procedures ........................ 2-3

SECTION III SCHEDULED MAINTENANCE

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

SECTION IV MAINTENANCE/SERVICE INSTRUCTIONS

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

4.2 Reinitialization Procedure ............................ 4-1

4.3 Table Top Removal / Installation ................. 4-2

4.4 Shrouds Removal / Installation .................... 4-3

4.5 Power Cord Removal / Installation............... 4-4

4.6 Control Disable Switch Removal /

Installation ............................................... 4-5

4.7 Hand Control Plug-In Port Removal /

Installation ............................................... 4-5

4.8 PC Control Board / Program PC Board

Removal / Installation .............................. 4-6

4.9 Foot Control Plug-In Port Removal /

Installation ............................................... 4-7

4.10 Base Down Limit Switch Removal /

Installation ............................................... 4-8

4.11 Actuator Motor / Actuator Brake

Removal / Installation .............................. 4-8

4.12 Base Actuator Assembly Removal /

Installation ............................................. 4-10

4.13 Gas Spring Removal / Installation ............. 4-12

4.14 Base Capacitor Removal / Installation ....... 4-13

4.15 Tilt Actuator Assembly Removal /

Installation ............................................. 4-14

4.16 Tilt Capacitor Removal / Installation .......... 4-15

4.17 Back Actuator Assembly Removal /

Installation ............................................. 4-16

4.18 Back Capacitor Removal / Installation ....... 4-18

4.19 Arm Rest Adjustment ................................ 4-18

4.20 Foot Extension Brake Lever Adjustment ... 4-19

4.21 Hand Control Panel Or Interface Board

Removal / Installation ............................ 4-19

4.22 Typical Foot Pedal Foot Switch Removal /

Installation ............................................. 4-20

4.23 Typical Foot Switch Removal /

Installation ............................................. 4-21

4.24 Foot Control Interface Board Removal /

Installation ............................................. 4-21

4.25 Plastic Foot Section Removal /

Installation ............................................. 4-22

4.26 Plastic Back Section Removal /

Installation ............................................. 4-23

4.27 Plastic Seat Section Removal /

Installation ............................................. 4-24

4.28 Base Up Limit Switch Removal /

Installation / Adjustment ......................... 4-25

4.29 Foot Extension Removal /

Installation .............................................. 4-26

SECTION V SCHEMATICS AND DIAGRAMS

5.1 Electrical Schematics / Wiring Diagrams ..... 5-1

5.2 Audible Signal Guide Chart ......................... 5-9

SECTION VI PARTS LIST

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

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

Pictorial Index ............................................ 6-2.*

Upholstery Set (Standard) .......................... 6-3.*

Back Section Components ......................... 6-4.*

Seat Section Components ........................... 6-5

Actuator Assembly (Domestic) .................. 6-6.*

Actuator Assembly (Canadian) .................. 6-7.*

Foot Section Components ........................... 6-8

Upper Chair Electrical Components

(Domestic) .............................................. 6-9.*

Upper Chair Electrical Components

(Canadian) ............................................ 6-10.*

Lower Chair Electrical Components .......... 6-11.*

Power Base Assembly ............................. 6-12.*

Base Sub-Assembly ................................ 6-13.*

Base Actuator Assembly ........................ 6-14.*

Foot Control Assembly ............................. 6-15.*

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

FAX ORDERING 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.

IMPORTANT INSTRUCTIONS

General Safety Instructions

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

with the safety 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 chair.

(2) Be sure you understand the instructions

contained in this manual before attempting to service or repair this chair.

Warnings

Throughout this manual are Note, Caution, and Danger paragraphs that call attention to particular procedures. These items are used as follows:

NOTE

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

Warranty Instructions

Refer to the Midmark “Limited Warranty” printed on the back cover of the Installation and Operation Manual for warranty information. Failure to follow the guidelines listed below will void the warranty and/or render the 417 Power Podiatry Treatment Chair unsafe for operation.

• In the event of a malfunction, do not attempt to operate the chair until necessary repairs have been made.

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

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

CAUTION

not correctly followed, could result in equipment damage.

A CAUTION is used for an operating procedure, practice, or condition which, if

DANGER

which, if not correctly followed, could result in loss of life or serious personal injury.

A DANGER is used for an operating procedure, practice, or condition

SECTION I

GENERAL INFORMATION

SECTION I

GENERAL INFORMATION

1.1 Scope of Manual

This manual contains detailed troubleshooting, scheduled maintenance, maintenance, and service instructions for 417 Power Podiatry Treatment Chair. This manual is intended to be used by Midmark’s authorized service technicians.

1.2 Description Of 417 Power Podiatry Treatment Chair

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

The 417 Power Podiatry Treatment Chair is an examination chair designed specifically for performing general podiatric examinations and minor podiatric procedures (Podiatry - treatment of foot ailments).

The major serviceable components of the chair are the arm casting linkage assembly, back actuator capacitor, back actuator assembly, tilt actuator capacitor, tilt actuator assembly, foot extension brake assembly, base capacitor, base actuator assembly, gas spring(s), base subassembly, base down limit switch, base up limit switch, PC control board, PC program board (a new style PC control board is now being used which combines the PC control board and PC program board together into one board), 0.5 amp fuse & 20 amp fuses for old style PC control board and 0.125 amp & 5 amp fuses for new style PC control board, control disable switch, foot control which includes foot switches and foot control interface board, and hand control which includes hand control panel and hand control interface board.

B. Theory of Operation (See Figures 5-1 thru 5-4 for

electrical schematic / wiring diagram)

115 VAC is supplied directly to the PC control board and to the two electrical outlets.

Power:

The 115 VAC that is supplied to the PC control board is applied across two types of fuses; a 20 amp fuse and a

0.5 or 0.125 amp fuse (0.5 amp fuse is used on old style

PC control board and 0.125 amp fuse is used on new style PC control board). 115 VAC is applied across a 20 amp fuse and supplies power to the contacts of the normally open actuator relays (there is one 20 amp fuse on the old style PC control board which protects all eight

actuator relays. There are four 5 amp fuses on the new style PC control board; one for each actuator motor). This power is used to run an actuator assembly when its relay is energized. There are two relays per actuator assembly; one for each direction. There are two relays on the PC control board for a foot actuator assembly, which are not used by the 417 model. However, this PC control board is used by another model, the 414, which has a foot actuator assembly and uses the relays. 115 VAC is also applied across the 0.5 amp fuse or 0.125 amp fuse (0.5 amp fuse is used on old style PC control board and 0.125 amp fuse is used on new style PC control board) to the PC control board transformer. The transformer and some associated follow on circuitry reduce the 115 VAC to a +5 VDC output and a +12 VDC output. Both voltages are used to power circuitry on the PC control board and PC program board. On the new PC control board, there is a green "BOARD FAIL L.E.D.". If the L.E.D. is flashing, normal operation is being indicated. If the L.E.D. is not flashing, the PC control board is malfunctioning. Loss of power or blown fuses can also cause the green L.E.D. to not flash.

Actuators:

• On older units (before SN BP7668) both Back and Tilt

actuators contain a pivot point on the end of the ball screw. If an actuator is run to the end of its stroke (mechanical home position), the ball screw shaft spins inside the nut, allowing the actuator to run without damaging or advancing the nut.

• On present units (after SN BP7668) both the Back and

Tilt actuators have limit switches to prevent overextending or retracting the actuator. Should the actuator reach the maximum extended or minimum retracted travel the specific limit switch contacts will Open, removing power from the actuator motor. This prevents the actuator from over-extending or over-retracting.

• All the actuator motors have a normally closed,

thermal overload switch which will open if the actuator assembly is run continuously and overheats. The actuator motor was not designed for continuous operation. The normal cool off period for the thermal overload switches is 10 - 20 minutes.

Normal Operation:

When a function switch is pressed on either the hand control or foot control, an interface board, located in the foot control or hand control, encodes the signal and sends it to the PC control board. The PC control board decodes the information and energizes the relay of the

SECTION I GENERAL INFORMATION

PC CONTROL

PC PROGRAM

BOARD

(0.5 Amp.)

(4) FUSE

(5 Amp.)

TILT ACTUATOR

CAPACITOR

OLD STYLE

(1) FUSE

(20 Amp.)

PC CONTROL

BOARD

TILT ACTUATOR

ASSEMBLY

NEW STYLE

(1) FUSE

(0.125 Amp.)

BACK ACTUATOR

ASSEMBLY

BACK ACTUATOR

CAPACITOR

ARM CASTING

LINKA GE ASSEMBLY

BASE

CAPACITOR

CONTROL

DISABLE

SWITCH

FOOT EXTENSION

BRAKE ASSEMBLY

FOOT

CONTROL

BASE ACTUATOR

FOOT CONTROL

INTERFACE BOARD

FOOT

SWITCHES

ASSEMBLY

BASE UP

LIMIT SWITCH

Figure 1-1. Major Components

HAND

CONTROL

GAS

SPRING(S)

BASE DOWN

LIMIT SWITCH

HAND CONTROL

PANEL

POSITION

BASE

SUBASSEMBLY

MIDMAR

ABLE

TIL

FOO

TIL

FOO

AUT

RETURN

POSITION

HAND CONTROL

INTERFACE BOARD

MA247301i

SECTION I

GENERAL INFORMATION

selected function. The 115 VAC that is continuously supplied to the normally open (N.O.) contacts of the relay is now applied across the actuator assembly motor windings, causing the actuator assembly to run. There is a diagnostic L.E.D. in each relay circuit. When a relay coil is energized, an L.E.D. that is in the same circuit illuminates, indicating that there is power at the relay's coil and the PC control board is working properly.

When the PC control board receives a function signal from a hand control or foot control, the microprocessor on the PC control board does several things; it continuously monitors the current draw of the running actuator assembly motor (this is important because different patient loads affect the amount of current drawn by the motor as well as its speed - meaning monitoring current draw can let the PC control board calculate an actuator assembly's speed). The PC control board also keeps track of how long an actuator assembly's relay has been energized (how long actuator assembly motor has been running). By comparing the current draw of the running actuator motor and the time period that an actuator assembly's relay has been energized, against an onboard data base, the PC control board can determine how far, in its range of motion, an actuator assembly has traveled. The PC control board records this positional information in its memory. The PC control board continuously calculates an actuator assembly's position and stores that information in memory for future use. Also, if the current draw of an actuator assembly exceeds a predetermined level for more than 0.5 seconds, the PC control board shuts down the actuator assembly, until the footswitch/button is released and depressed again.

When an operator selects a function, the PC control board calculates the maximum run time that it will take the actuator assembly to reach the end of its travel range. If the operator holds down the function button longer than the maximum run time, the PC control board will deenergize the relay of the actuator assembly when the maximum run time is reached, causing the actuator assembly motor to stop running. This prevents excessive wear on an actuator assembly due to a switch sticking or an operator continuously holding down a function switch.

When a function (this is true for only for a few of the functions) is reselected, after its actuator assembly has been stopped by the PC control board because it reached its maximum run time, the PC control board will allow the actuator assembly to run for 2 seconds before deenergizing its relay. This allows the mechanical "home" position of the actuator assembly to be synchronized with the PC control board's software "home"

position.

The TABLE UP and TABLE DOWN function works slightly different however; it uses a limit switch to stop the actuator assembly when it reaches its end of travel instead of letting the PC board stop it. This prevents wear of the base actuator assembly by not allowing it to freewheel. The base actuator assembly sees much heavier loads on it than do the other actuator assemblies. If the base actuator assembly were allowed to freewheel, the life of the actuator assembly would be greatly reduced. The base up and base down limit switch is a normally closed switch. When either limit switch is tripped, the circuit that provides power to the base actuator assembly for the up or down function is opened, causing the base actuator assembly to stop.

Programmed Positions:

The operator positions the chair into a position he/she would like to store into memory. When the PROGRAM button is pressed and held for 0.2 seconds for old style PC control board or 1 second for new style PC control board, the PC control board is in program mode and is ready to store a position into memory. Then, when one of the two program position buttons ("1" or "2") on the foot control or one of the four program position buttons ("1", "2", "3", or "4") on the hand control is pressed, the position of the chair is stored into the PC control board's memory. The operator has five seconds in which to select a programmed position button. After five seconds, the PC control board cancels the program mode. Also, if any buttons other than the program position buttons "1", "2", "3", or "4" are pressed, the program mode is canceled. The PC control board stores the chair's position which has been calculated and stored in the PC control boards memory as described in the "normal operation" of a function.

When an operator presses a programmed position button, the PC control board determines which functions need to move and energizes the relays for the actuator assemblies of those functions. The PC control board uses the method described in "normal operation" to determine when an actuator assembly of a function has reached its programmed position. When an actuator assembly of a function reaches its position, its relay is deenergized. This continues until all actuator assemblies of affected functions have reached their position.

If the operator wishes to stop the chair, for any reason, before all functions have reached their programmed position, the STOP button may be pressed. When the

SECTION I GENERAL INFORMATION

STOP button is pressed, the PC control board immediately deenergizes all relays, causing the chair to stop. The STOP button overrides all other commands.

When a programmed position button is selected, it can be pressed and then released; it does not need to be held down. However, there is a selector switch; S1 on the old style PC control board and SW2-4 on new style PC control board, that can be switched to change this. Then the programmed position button must be pressed and held until the chair reaches its programmed position; if the button is released, the chair will stop moving. The switch (S1) works as follows: when the switch S1 is pushed in, the programmed position button can be pressed and released. When the switch S1 is pulled out, the programmed position button must be pressed and held. Switch SW2-4 works as follows: when switch is ON, programmed position buttons can be pressed and released. When switch SW2-4 is OFF, programmed position buttons must be pressed and held.

Auto Return Function Operation:

When the operator presses the AUTO RETURN button, the PC control board determines which functions need to move and energizes the relays for the actuator assemblies of those functions. The PC control board uses the method described in "normal operation" to determine when an actuator assembly of a function has reached the mechanical home position. When an actuator assembly of a function reaches its home position, its relay is deenergized. This continues until all actuator assemblies have reached their mechanical home position.

The PC control board adds a slight overrun time to each function during the AUTO RETURN mode to ensure all actuator assemblies reach their mechanical home position and freewheel. This allows the mechanical "home" position of the actuator assemblies to be synchronized with the PC control board's software "home" position, which is important if correct program positioning of chair is to be acheived.

If the operator wishes to stop the chair for any reason, before all functions have reached their programmed position, the STOP button may be pressed. When the STOP button is pressed, the PC control board immediately deenergizes all relays, causing the chair to stop. The STOP button overrides all other commands.

Re-initialization:

If a PC control board loses power for approximately 3 days or longer or if the chair is new, the chair must be re-initialized. If the chair does not move to correct programmed positions even after an AUTO RETURN

has been initiated, the PC control board probably needs re-initialized. To re-initialize the PC control board, either the PROGRAM, TABLE UP, and TABLE DOWN buttons

PROGRAM, POSITION "1", and POSITION "2" buttons must be pressed and held for at least 2 seconds (which buttons must be pressed depend on which type of foot control the chair has. On a chair with a hand control, either group of buttons may be used). This clears all position memory from the PC control board, except for programmed positions. The PC control board makes all buttons inactive, except for the AUTO RETURN button and STOP button. The AUTO RETURN button should now be pressed which will cause the chair to run each actuator assembly to its mechanical home position. The reinitialization procedure must be fully completed before normal operation of the chair can be resumed.

Audible Alert Tones: (See Table 5-1)

The new style PC control board has audible tones to provide feedback to the operator. SW2-1 controls whether the tones are activated or deactivated; if SW2-1 is ON, tones are activated. If SW2-1 is OFF, tones are deactivated.

General Information:

A capacitor is in each actuator assembly circuit. The capacitor provides start up power and run power for the actuator motor.

The PC control board constantly monitors the control disable switch for +12 VDC. If 0.0 VDC is detected (the control disable switch is ON, meaning the chair is disabled), the PC control board disables the relays of all functions and removes power from the foot control or hand control. If +12 VDC is detected (the control disable switch is OFF, meaning the chair is enabled), the PC control board operates normally. The control disable switch is located under the left electrical outlet. This function allows the controls to be disabled, preventing unauthorized personnel from operating the chair, such as a patient.

The maximum number of buttons that can be pressed at one time is three; if any more than three buttons are pressed at one time, the PC control board forces the STOP function to be executed.

There is either a capacitor / battery on the old style PC control board that provides power to retain the board's memory. The PC control board will retain its memory for approximately 3 days. On new style PC control boards, there is an EEPROM chip which retains the board's memory indefinitely.

SECTION I

GENERAL INFORMATION

1.3 SPECIFICATIONS

Factual data for the 417 Power Podiatry Treatment Chair is provided in Table 1-1.

Table 1-1. Specifications

Description Data

Weight:

Without Shipping Carton ................. 525 lb (238.1 kg)

With Shipping Carton ...................... 575 lb (260.8 kg)

Shipping Carton ...... 76 in. "L" x 35 in. "W" x 36 in. "H"

(193 cm x 88.9 cm x 91.4 cm)

Dimensions:

Table Top Length .............................. 70 in. (177.8 cm)

Table Top Length with foot

section fully extended .............. 78 11/16 in. (199.9 cm)

Table Top Width (including arms) ... 28 1/8 in. (71.4 cm)

Chair Positioning (Adjustable):

Table Top Height ............................... 22.5 in. to 41 in.

(57.2 cm to 104.1 cm)

Back Down to Back Up .................................. 16° - 83°

Tilt Down to Tilt Up ......................................... 0° - 30°

Chair Speed:

Table Down to Table Up ............................ 15 seconds

Back Down to Back Up ............................... 8 seconds

Tilt Down to Tilt Up ..................................... 8 seconds

Debris Tray ......................... Extends 8 3/4 in (22.2 cm)

beyond foot section

Minimum Height at foot

section w/o tilt ............................... 19.5 in. (49.5 cm)

Maximum Height at foot

section w/o tilt ............................... 38.5 in. (97.8 cm)

Maximum Height at foot

section with maximum tilt .......... 56 1/4 in. (142.9 cm)

Maximum Height at foot

section with maximum tilt

and maximum lift ....................... 55 1/4 in. (140.3 cm)

Maximum Height at foot

section with maximum tilt, maximum lift, and foot

section fully extended ..................... 58 in. (147.3 cm)

Weight Capacity (Normal Operation) ...... 300 lb (136 kg)

Weight Capacity (Overweight

Operation) ............................................... 350 lb (159 kg)

Electrical Requirements:

115 VAC Unit ............................ 110 - 120 VAC, 60 HZ,

15 amp, single phase

Power Consumption:

115 VAC Unit ......................................... 1440 WATTS,

12 amps @ 120 VAC

Recommended Circuit:

A separate (dedicated) circuit is recommended for this chair. The chair

should not

be connected to an electrical circuit with other appliances or equipment unless the circuit is rated for the additional load.

1.4 Parts Replacement Ordering

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

(1) Refer to Figure 1-2 to determine the location of

the model number and serial number of the chair 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 chair for this information. Otherwise, this information may be obtained from the dealer that sold the chair.

(3) Determine the installation date of the chair 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).

MODEL

NUMBER

MIDMARK

MODEL

INPUT

RATING

SERIAL NO.

115 VAC 60 HZ

417

12 AMP

BPXXXXX

MIDMARK

MODEL INPUT

RATING

SERIAL NO.

115 VAC 60 HZ

417

12 AMP

BPXXXXX

SERIAL

NUMBER

Figure 1-2. Model Number / Serial

Number Location

MIDMARK

417

MA2476

SECTION I GENERAL INFORMATION

1.5 Special Tools

Table 1-2 lists all of the special tools needed to repair the chair, how to obtain the special tools, and the purpose of each special tool.

Table 1-2. Special Tool List

Description of Special Tool

Multimeter Commercially Available Any Type Used to perform continuity and voltage checks.

Torque Wrench Commercially Available Any Type Used to tighten hardware to specified torque

Manufacturer's

Name / Address / Phone

Manufacturer's

Part Number

Purpose of Special Tool

values.

TESTING AND TROUBLESHOOTING

SECTION II

TESTING AND TROUBLESHOOTING

SECTION II

2.1 Operational Test (See Figure 2-1)

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

DANGER

Refer to the Operator Manual for

complete instructions on operating the chair. Failure to do so could result in personal injury.

NOTE

The Operational Test, for the most part, only describes what should happen when the chair is operated. If the chair 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 chair into a grounded, non-isolated,

correctly polarized outlet that has the proper voltage output for the chair.

NOTE

To disable the chair, the control disable switch must be thrown toward foot end of chair.

(2) Switch the CONTROL DISABLE switch to the

disable position (See Figure 2-1).

(7) Observe. The table top should move in the

direction corresponding to the pedal which is being depressed. Each function should have the following range of motion:

TABLE UP to TABLE DOWN - 22.5 in. to 41 in. (57.2 cm to 106.7 cm) TILT DOWN to TILT UP - 0° to 30° BACK DOWN to BACK UP - 16° to -83°

Function speeds should be as follows:

TABLE DOWN to TABLE UP - 15 seconds BACK DOWN to BACK UP - 8 seconds TILT DOWN to TILT UP - 8 seconds.

When an actuator assembly reaches its limit, the PC control board should automatically stop the function from freewheeling after a short time. The arm rests should be parallel with the seat section of the table top when the back section is all the way up.

(8) Place approximately 300 lbs (136 kg) on seat

section of table top. Run TABLE UP and TABLE DOWN functions all the way up and all the way down.

(9) Observe. The base actuator assembly should

be able to raise and lower normally with the 300 lb (136 kg) load. The base actuator assemby should not squeal or make excessive noise when it freewheels at the end of its stroke.

(3) Depress TABLE UP, TABLE DOWN, BACK

UP, BACK DOWN, TILT UP, and TILT DOWN pedals on foot control.

(4) Observe. No functions should operate.

NOTE

To enable the chair, the control disable switch must be thrown toward head end of chair.

(5) Switch the CONTROL DISABLE switch to

enable position.

(6) Depress TABLE UP, TABLE DOWN, BACK

UP, BACK DOWN, TILT UP, and TILT DOWN pedals on foot control and run each function to its limit.

(10) Remove the 300 lb (136 kg) weight.

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

(12) Depress the AUTO RETURN foot switch. After

the table top lowers halfway, depress the STOP foot switch.

(13) Observe. When the AUTO RETURN foot

switch is depressed, the table top should begin to lower. When the STOP foot switch is depressed, the table top should stop lowering.

(14) Depress the AUTO RETURN foot switch and

allow the table top to lower completely.

SECTION II TESTING AND TROUBLESHOOTING

HAND CONTROL

BUTTONS (OPTIONAL)

STOP

AUTO

RETURN

POSITION

"1"

POSITION

"3"

POSITION

FOOT CONTROL

SWITCHES

STOP

AUTO

RETURN

"4"

TILT

AUTO

RETURN

POSITION

"2"

POSITION

"1"

BACK

FOOT

STOP

"2"

MIDMARK

TABLE

BACK

TILT

DOWN

TILT

DOWN

FOOT

DOWN

PROGRAM

TABLE

DOWN

PROGRAM

TABLE DOWN

BACK

DOWN

TILT

DOWN

PARALLEL

FOOT

SECTION

TABLE

TOP

SEAT

SECTION

BACK

SECTION

ARM

REST

CONTROL

DISABLE

SWITCH

TABLE

TABLE DOWN

BACK

DOWN

TILT

DOWN

Figure 2-1. Operational Test

417

MIDMARK

FOOT CONTROL

CAUTION

D E

T A

CONTROL

C H

NOT IN USE

HEN

MA2474

SECTION II

TESTING AND TROUBLESHOOTING

(15) Observe. When the table top is completely

lowered, the base actuator assembly should stop running (before the base actuator assembly is allowed to freewheel), indicating that the base down limit switch has been tripped.

NOTE

A hand control is an optional accessory; not all units have one.

(16) If chair has a hand control, repeat steps 6, 7,

and 11 thru 15 using the buttons on the hand control.

(17) Depress the PROGRAM foot switch on foot

control - one second for new style board and

0.2 seconds for old style board.

NOTE

A program position foot switch must be depressed within 5 seconds of depressing the PROGRAM foot switch.

Table 2-1. Troubleshooting Guide

(18) Depress the POSITION "1" foot switch.

(19) Use any of the single function foot pedals to

move the table top to a new position.

(20) Depress the POSITION "1" foot switch.

(21) Observe. The table top should move back to

the position programmed in steps 17 and 18.

NOTE

A hand control is an optional accessory; not all units have one.

(22) If chair has a hand control, repeat steps 17 thru

21 using the PROGRAM button and POSITION "1", "2", "3", and "4" buttons on the hand control instead of foot control.

2.2 Troubleshooting Procedures

Table 2-1 is a Troubleshooting Guide which is used to determine the cause of the malfunction.

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detacol(noitisop"FFO"

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SECTION II TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

Chair will not operate when any of the six up and down functions, program function, or auto return function are selected - Continued.

No actions can be initiated from foot control.

No actions can be initiated from hand control.

When a foot switch or hand control button is depressed, its actuator does not run or hum Continued.

Chair has power, but no functions can be initiated from foot control (hand control functions properly).

Chair has power, but no functions can be initiated from hand control (foot control functions properly).

0.5 amp fuse or 20 amp fuse on old style PC control board or 0.125 amp fuse on new style PC control board is blown.

The supply voltage for PC control board is below normal limits.

PC control board is locked up and needs to be reinitialized.

PC control board is malfunctioning.

Hand control, foot control, or coil cord malfunctioning.

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

Coil cord receptacle on chair is malfunctioning.

Coil cord receptacle (is part of foot control interface board) on foot control is malfunctioning.

Coil cord is malfunctioning. Use a multimeter to perform a

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

Ribbon connector from hand control panel has become disconnected from the control interface board.

Coil cord receptacle on chair is malfunctioning.

Coil cord receptacle (is part of control interface board) on hand control is malfunctioning.

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

Check facility power source for voltage between 110 - 120 VAC.

— Reinitialize the PC control

Replace suspect PC control board with known working PC control board. On new style PC control boards, check if green Board Fail L.E.D. is flashing. Flashing indicates normal operation, while not flashing indicates a malfunction.

Replace suspect component with known working component.

Check if coil cord is plugged in properly.

Plug foot control into receptacle on other side of chair and then attempt to operate chair. If works now, receptacle was malfunctioning.

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

continuity check on the coil cord.

Check if coil cord is plugged in properly.

Check if ribbon connector is connected to the control interface board properly.

Plug hand control into receptacle on other side of chair and then attempt to operate chair. If works now, receptacle was malfunctioning.

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

Replace any blown fuses.

If voltage is below 110 VAC, correct low voltage problem of facility power source.

board. Refer to para 4.2.

Replace PC control board. Refer to para 4.8.

Replace malfunctioning component.

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

Replace receptacle.

Replace foot control interface board. Refer to para 4.24.

Replace coil cord.

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

Connect ribbon connector of hand control panel to control interface board. Refer to para 4.21.

Replace receptacle.

Replace control interface board. Refer to para 4.21.

OLD

STYLE

0.5 amp. FUSE

20 amp.

FUSE

TABLE

L.E.D.

TABLE DOWN

L.E.D.

BACK

L.E.D.

BACK

DOWN

L.E.D.

TILT

L.E.D.

TILT

DOWN

L.E.D.

SECTION II

TESTING AND TROUBLESHOOTING

L.E.D.'S NOT

USED ON

417 MODEL

NEW

STYLE

0.125 amp. FUSE

TABLE

L.E.D.

TABLE DOWN

L.E.D.

BACK

L.E.D.

BACK

DOWN

L.E.D.

TILT

L.E.D.

DOWN

L.E.D.

5 amp. FUSES

TILT

BOARD

FAIL

L.E.D.

L.E.D. NOT

USED ON

417 MODEL

L.E.D. NOT

USED ON

417 MODEL

MA2475

Figure 2-2. Indicator L.E.D.'s For Use With Troubleshooting Guide

SECTION II TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

No actions can be initiated from hand control - Continued.

Chair has power, but no functions can be initiated from hand control (foot control functions properly)

- Continued.

Coil cord is malfunctioning. Use a multimeter to perform a

continuity check on the coil cord.

Hand control is malfunctioning. Replace suspect control

interface board with known working control interface board.

Replace coil cord.

Replace control interface board. Refer to para 4.21.

One or more functions cannot be initiated from foot control or hand control.

TABLE UP and TABLE DOWN functions do not work.

Some functions may be initiated with foot control or hand control, but some may not.

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

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

Reinitialization routine was not fully completed.

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

A push-button switch in foot control is malfunctioning.

Wire connections loose in foot control.

Base capacitor is weak or blown.

Thermal overload switch in base actuator assembly is activated.

Base actuator assembly is malfunctioning.

5 amp fuse for TABLE UP and TABLE DOWN functions is blown (applies to new style PC board only).

Wire connections loose. Check all wiring connections to

Gas spring(s) are malfunctioning.

Base actuator is drawing excessive current for more than

0.5 seconds.

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

Perform continuity check on push-button switch or replace push-button switch with a known working switch.

Check all wiring connections from the push-button switch to the control interface board.

Replace suspect base capacitor with known working base capacitor.

Replace suspect base actuator assembly or actuator motor with a known working assembly.

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

base actuator assembly.

Replace suspect gas spring(s) with known working gas spring(s).

Release all buttons. Then, run base actuator again to see if it stops running again.

— Run another reinitialization

— Wait 10 to 20 minutes to allow

Replace hand control panel. Refer to para 4.21.

procedure. If it doesn't work, unplug all actuator wire harnesses from PC board and run a third initialization procedure. Refer to para 4.2.

Replace hand control panel. Refer to para 4.21.

Replace push-button switch. Refer to para 4.22 or 4.23.

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

Replace base capacitor. Refer to para 4.14.

base actuator assembly to cool.

Replace actuator motor or base actuator assembly. Refer to para 4.11 or 4.12.

Replace blown fuse.

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

Replace gas spring(s). Refer to para 4.13.

If problem repeats, replace base capacitor, actuator motor, or actuator. Refer to para 4.14,

4.11, or 4.12.

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

TABLE UP and TABLE DOWN functions do not work Continued.

BACK UP and BACK DOWN functions do not work.

TILT UP and TILT DOWN functions do not work.

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

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

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

PC control board is malfunctioning.

Back capacitor is weak or blown.

Thermal overload switch in back actuator assembly is activated.

Back actuator assembly is malfunctioning.

5 amp fuse for BACK UP and BACK DOWN functions is blown (applies to new style PC board only).

Wire connections loose. Check all wiring connections

Back actuator is drawing excessive current for more than 0.5 seconds.

PC control board is malfunctioning.

Tilt capacitor is weak or blown.

Thermal overload switch in tilt actuator assembly is activated.

Tilt actuator assembly is malfunctioning.

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

Replace suspect back capacitor with known working back capacitor.

— Wait 10 to 20 minutes to

Replace suspect back actuator assembly or actuator motor with a known working assembly.

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

to back actuator assembly.

Release all buttons. Then, run back actuator again to see if it stops running again.

Refer to Figure 2-2 for this check. Press BACK UP and then the 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, PC control board is malfunctioning.

Replace suspect tilt capacitor with known working tilt capacitor.

— Wait 10 to 20 minutes to

Replace suspect tilt actuator assembly or actuator motor with a known working assy.

Replace PC control board. Refer to para 4.8.

Replace back capacitor. Refer to para 4.18.

allow back actuator assembly to cool.

Replace actuator motor or back actuator assembly. Refer to para 4.11 or 4.17.

Replace blown fuse.

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

If problem repeats, replace back capacitor, actuator motor, or actuator. Refer to para 4.18, 4.11, or 4.17.

Replace PC control board. Refer to para 4.8.

Replace tilt capacitor. Refer to para 4.16.

allow tilt actuator assembly to cool.

Replace actuator motor or tilt actuator assembly. Refer to para 4.11 or 4.15.

SECTION II

SECTION II TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

TILT UP and TILT DOWN functions do not 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.

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

One function runs properly, but the other does not.

5 amp fuse for TILT UP and TILT DOWN functions is blown (applies to new style PC board only).

Wire connections loose. Check all wiring connections

Tilt actuator is drawing excessive current for more than 0.5 seconds.

PC control board is malfunctioning.

Wire connections loose. Check all wiring connections

Gas spring(s) are malfunctioning (especially for TABLE UP function).

PC control board is malfunctioning.

TABLE UP or TABLE DOWN foot switch is malfunctioning.

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

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

to tilt actuator assembly.

Release all buttons. Then, run tilt actuator again to see if it stops running again.

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

to base actuator assembly.

Replace suspect gas spring(s) with known working gas spring(s).

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

Perform a continuity check on suspect foot switch.

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

Replace blown fuse.

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

If problem repeats, replace tilt capacitor, actuator motor, or actuator. Refer to para 4.16, 4.11, or 4.15.

Replace PC control board. Refer to para 4.8.

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

Replace gas spring(s). Refer to para 4.13.

Replace PC control board. Refer to para 4.8.

Replace foot switch. Refer to para 4.22.

Replace hand control panel. Refer to para 4.21.

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

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SECTION II

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timilnwodesabecalpeR

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SECTION II TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

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TLITtub,skrow

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TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

melborPmotpmySesuaCelbaborPkcehCnoitcerroC

SECTION II

s'riahcehT

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SECTION II TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

melborPmotpmySesuaCelbaborPkcehCnoitcerroC

s'riahcehT

noitcnufMARGORP

krowtonseod

.deunitnoC-ylreporp

.spots

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SCHEDULED MAINTENANCE

SECTION III

SCHEDULED MAINTENANCE

SECTION III

3.1 Scheduled Maintenance

periodically on the chair. These inspections and services should be performed as often as indicated in

Table 3-1 is a Scheduled Maintenance Chart which lists

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 chair for obvious damage such as: cracks in components, missing

Fasteners/hardw are Check chair for missing or loose fasteners/hardware. Replace any missing hardware and

Warning and instructional decals

Pivot points/moving parts/accessories

Foot control Check that foot control works correctly. Make sure all foot switches operate properly.

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

PROGRAM function Check the PROGRAM function works properly. Check that programmed positions can be stored

AUTO RETURN function Check that the AUTO RETURN function works correctly. Make sure the base actuator

Ball screws of actuator assemblies

Actuator assemblies Operate each function and listen for squealing noises, indicating a bad actuator assembly.

Drift in chair Check each actuator assembly to see if it drifts. Replace actuator assembly brake if

Control disable switch Check operation of control disable switch. Replace switch if necessary. Refer to para 4.6.

Arm Rests Check that arm rests are parallel to the seat section of chair when the back section is all the

Foot section Check operation of foot section and foot section brake lever. Make sure brake lever holds foot

Base Subassembly Check the base subassembly for excessive play. The base of the chair should not be able to

Electrical receptacles Check that the electrical receptacles are functioning properly. Replace electrical receptacles

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

Reinitialization Reinitialize the PC control board. Refer to para 4.2.

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

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

tighten any loose hardware as necessary.

Check for missing or illegible decals. Replace decals as necessary.

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

and used.

assembly does not freewheel when it is lowered all the way; it should be stopped by the base down limit switch. The base actuator should be within 1/4 in (6.35 mm) of freewheeling when base down limit switch is tripped. If necessary, adjust base down limit switch. Refer to para

4.10.

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.

Coat ball screw of noisy actuator assembly with STP treatment oil or equivalent. If oil does not correct the problem, replace the noisy actuator. Refer to para 4.12, 4.15, and 4.17.

necessary. Refer to para 4.11.

way up. If not adjust arm rests. Refer to para 4.19.

section securely in place when released. Adjust if necessary. Refer to para 4.20.

be moved back and forth.

as necessary.

necessary, repair or replace the accessory.

MAINTENANCE / SERVICE

SECTION IV

MAINTENANCE / SERVICE INSTRUCTIONS

SECTION IV

4.1 Introduction

DANGER

Refer to the Operator Manual for

complete instructions on operating the chair. Failure to do so could result in personal injury.

NOTE

Perform an operational test on the chair after the repair is completed to confirm the repair was properly made and that

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

all

malfunctions were repaired.

4.2 Reinitialization Procedure

A. Reinitialization Procedure #1 (Applies To Chair With

An Old Style Foot Control)

NOTE

The PROGRAM footswitch must be depressed first, or the chair will begin to move.

AUTO RETURN

FOOT SWITCH

PROGRAM

FOOT SWITCH

TABLE DOWN

FOOT SWITCH

TABLE UP

FOOT SWITCH

Figure 4-1. Reinitialization Procedure #1

(4) If first reinitialization procedure fails, unplug all

actuator wire harnesses from PC board and run another reinitialization procedure. Then, reconnect wire harnesses.

B. Reinitialization Procedure #2 (Applies To Chair With

An New Style Foot Control or a Hand Control)

MA2477

(1) Simultaneously depress and hold the PRO-

GRAM, TABLE UP, and TABLE DOWN footswitches for at least two seconds; then release footswitches. See Figure 4-1.

CAUTION

When the following step is performed, the

chair will move all of its functions. Make sure chair is clear of all obstructions. Failure to do so could result in damage to chair or surrounding items.

(2) Depress and release the AUTO RETURN

footswitch.

(3) Observe. Each actuator assembly will run for

approximately 18 seconds to ensure that it reaches its mechanical home position (if the run time is less than 18 seconds, the procedure probably did not work and should be attempted again). The mechanical home position is: BACK UP function all the way up, TABLE DOWN function all the way down, and TILT DOWN function all the way down. When actuator assemblies stop running, the reinitialization procedure is complete.

NOTE

The PROGRAM switch must be depressed first, or the chair will begin to move.

(1) Simultaneously depress and hold the PRO-

GRAM, POSITION "1", and POSITION "2" switches for at least two seconds; then release switches. See Figure 4-2.

CAUTION

When the following step is performed, the

chair will move all of its functions. Make sure chair is clear of all obstructions. Failure to do so could result in damage to chair or surrounding items.

(2) Depress and release the AUTO RETURN

switch.

(3) Observe. Each actuator assembly will run for

SECTION IV MAINTENANCE / SERVICE

HAND CONTROL (OPTIONAL)

AUTO

POSITION

"1"

SWITCH

RETURN

SWITCH

RETURN

POSITION

FOOT

STOP

AUTO

POSITION

PROGRAM

"2"

SWITCH

NEW STYLE

FOOT CONTROL

AUTO

RETURN

SWITCH

POSITION

"1"

SWITCH

POSITION

"2"

SWITCH

Figure 4-2. Reinitialization Procedure #2

BACK UP function all the way up, TABLE DOWN function all the way down, and TILT DOWN function all the way down. When actuator assemblies stop running, the reinitialization procedure is complete.

TABLE

BACK

TILT

DOWN

TILT

DOWN

FOOT

DOWN

SWITCH

PROGRAM

MIDMARK

TABLE

DOWN

BACK

SWITCH

MA2478

(2) Unplug power cord from wall outlet.

(3) Unplug power cord wire harness (1, Figure 4-3)

from wire harness (2).

(4) Disconnect cord set (3) from modular

coupler (4).

NOTE

Units with Serial Numbers BP-1000 thru BP-1363 have only three wires to disconnect. This is because these units do not have a base down limit switch.

(5) Tag and disconnect four wires (5) from four

wires (6).

(6) Cut cable tie which is securing wires/wire

harness to table top.

(7) Remove four nuts (7) and lockwashers (8) from

studs (9).

DANGER

Table top weighs approximately 140

lbs (63.5 kg) (without upholstery). Use an assistant to help in removing table top. Use proper lifting techniques to prevent back strain. Failure to do so could result in serious personal injury.

(4) If first reinitialization procedure fails, unplug all

actuator wire harnesses from PC board and run another reinitialization procedure. Then, reconnect wire harnesses.

4.3 Table Top Removal / Installation

A. Removal

CABLE

TIE

(1) Raise BACK UP and TILT UP functions all the

way up.

MIDMARK

417

DANGER

Always unplug the power cord from

the wall outlet before removing any of the chair's shrouds/covers 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.

MA2479

Figure 4-3. Table Top Removal / Installation

(8) With the help of an assistant, remove table top

(10) from plate (11).

B. Installation

SECTION IV

MAINTENANCE / SERVICE

(1) With the help of an assistant, install table top

(10) on plate (11) and secure with four lockwashers (8) and nuts (7).

NOTE

Units with Serial Numbers BP-1000 thru BP-1363 have only three wires to disconnect. This is because these units do not have a base down limit switch.

(2) Connect four wires (5) to four wires (6).

(3) Connect cord set (3) to modular coupler (4).

(4) Connect power cord wire harness (1) to wire

harness (2).

(5) Secure wires/wire harness to table top with

cable tie.

(6) Plug power cord into wall receptacle.

4.4 Shrouds Removal / Installation

A. Removal

PROTECTIVE

TRIM

FOOT

CONTROL

CAUTION

T A

CONTROL

C H

F O

NOT IN USE

HEN

(1) Remove table top (Refer to para 4.3).

(2) Remove four screws (1, Figure 4-4); then

remove base outer shroud (2) and outer shroud (3) as an assembly from base subassembly (4).

(3) Remove shims (5), making sure to note number

and location of shims for installation.

NOTE

Inner shroud can be raised to gain access to base subassembly components without removing power cord. Only remove power cord if inner shroud is being removed.

(4) Remove power cord (Refer to para 4.5).

(5) Disconnect cord set (6) from modular

coupler (7).

(6) Remove four screws (8) and inner shroud (9)

from base subassembly (4).

MA2480

Figure 4-4. Shrouds Removal / Installation

B. Installation

(1) Install inner shroud (9) on base subassembly (4)

and secure with four screws (8).

(2) Connect cord set (6) to modular coupler (7).

(3) Install power cord (Refer to para 4.5).

SECTION IV MAINTENANCE / SERVICE

(4) Place shims (5) in same location on base

subassembly (4) in which they were removed from.

NOTE

Make sure the shims are held in place by a screw.

(5) Install outer shroud (3) and base outer shroud

(2) as an assembly on base subassembly (4) and secure with four screws (1).

CABLE

TIE

417

MIDMARK

(6) Check to make sure there is a piece of protec-

tive trim on each corner of the outer shroud (3). If not, find and reinstall.

(7) Install table top (Refer to para 4.3).

4.5 Power Cord Removal / Installation

A. Removal

(1) If possible, raise TILT UP function all the way

up.

DANGER

Always unplug the power cord from

(2) Unplug power cord from wall outlet.

(3) Disconnect power cord wire harness (1, Figure

4-5) from wire harness (2).

(4) Raise up outer shroud (3) and use a support to

hold it there.

(5) Remove three screws (4) and three wire clips (5)

from base subassembly (6).

(6) Cut cable ties which are securing all wires/wire

harnesses together.

(7) Remove strain relief bushing (7) from inner

shroud (8) and then remove power cord (1) from chair.

CABLE

TIES

F O O

N T

R O

U TIO

CONTROL

T IN

HEN

WIRE HOLE

SUPPORT

Figure 4-5. Power Cord Removal / Installation

B. Installation

(1) Feed power cord (1) thru wire hole in inner

shroud (8).

(2) Connect power cord wire harness (1) to wire

harness (2).

(3) Secure wires/wire harness to base subassembly

(6) with three wire clips (5) and screws (4).

(4) Secure all wires/wire harnesses together with

cable ties.

(5) Install strain relief bushing (7) around power

cord (1) and then insert strain relief bushing into wire hole in inner shroud (8).

(6) If chair has been without power for more than

three days, perform the reinitialization procedure (Refer to para 4.2).

MA2481

4.6 Control Disable Switch Removal /

TABS

Installation

A. Removal

DANGER

Always unplug the power cord from

(1) Unplug power cord from wall outlet.

NOTE

Control disable switch can be located on either side of the chair. The following procedure shows the switch being removed from the patient's left side of the chair.

(2) Remove four screws (1, Figure 4-6) and partially

separate control cover (2) from plastic seat section (3).

(3) Disconnect two wires (4) from control disable

switch (5).

(4) Press on four tabs of of control disable switch

(5), while simultaneously pulling control disable switch out of control cover (2).

SECTION IV

MAINTENANCE / SERVICE

MA2482

Figure 4-6. Control Disable Switch

Removal / Installation

4.7 Hand Control Plug-In Port Removal / Installation

A. Removal

DANGER

Always unplug the power cord from

MIDMA

B. Installation

(1) Push control disable switch (5) into control

cover (2) until it "pops" into place, making sure terminals "1" and "2" are pointing toward foot end of table.

(2) Connect two wires (4) to control disable

switch (5).

(3) Install control cover (2) on plastic seat section

(3) and secure with four screws (1).

(1) Unplug power cord from wall outlet.

(2) Remove four screws (1, Figure 4-7) and partially

separate control cover (2) from plastic seat section (3).

(3) Remove clip (4) and hand control port (5) from

control cover (2).

(4) Remove six screws (6) and partially separate

receptacle cover (7) from plastic seat section (3).

(5) Disconnect connector of hand control port (5)

from modular coupler (8).

+ 82 hidden pages

Midmark 417-001, 417, 417-003 Parts Manual

Specifications and Main Features

Frequently Asked Questions

User Manual