Midmark 413 Service manual

413

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-001 thru -004

Power Female Procedure Examination Chair

Serial Number Prefixes: BK, V, DT & FH

Service and

Parts Manual

FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

SF-1457 Part No. 004-0003-00 Rev. O (1/01/06)

413

-001 thru

-004

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TABLE OF CONTENTS

Section/Paragraph Page Section/Paragraph Page

IMPORTANT INSTRUCTIONS

General Safety Instructions......................................... ii

Safety Alert Symbols .................................................. ii

Warranty Instructions ................................................... ii

SECTION I GENERAL INFORMATION

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

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

1.3 Description of 413 Power Female

Procedures Chair ..................................... 1-1

1.4 Specifications ............................................. 1-3

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

1.6 Special Tools .............................................. 1-5

SECTION II TESTING AND TROUBLESHOOTING

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

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

SECTION III SCHEDULED MAINTENANCE

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

SECTION IV MAINTENANCE/SERVICE INSTRUCTIONS

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

4.2 Seat Up Limit Switch Removal /

Installation ................................................ 4-1

4.3 Seat Actuator Removal / Installation ............ 4-2

4.4 Pan Safety Limit Switch Removal /

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

4.5 Gas Spring Removal / Installation ................ 4-6

4.6 Base Actuator Removal / Installation ........... 4-7

4.7 Typical Capacitor Removal / Installation ...... 4-9

4.8 Typical Actuator Motor / Actuator Brake

Removal / Installation ............................. 4-10

4.9 Base Down Limit Switch or Seat Down Limit

Switch Removal / Installation .................. 4-11

4.10 Typical Foot Pedal Footswitch Removal /

Installation .............................................. 4-13

SECTION V SCHEMATICS AND DIAGRAMS

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

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 .............................................. 6-2

Labels and Decals ........................................ 6-3

Upholstery .................................................... 6-4

Main Frame Section ................................... 6-5.*

Stirrup Assembly ......................................... 6-6

Stirrups ...................................................... 6-7.*

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

Cross Support ............................................ 6-9.*

Base Components .................................... 6-10.*

Base Actuator .......................................... 6-11.*

Base And Panels ..................................... 6-12.*

Linkage Assembly .................................... 6-13.*

Pan Assembly.......................................... 6-14.*

Footrest Assembly ................................... 6-15.*

Seat Components ..................................... 6-16*

Seat Actuator ........................................... 6-17.*

Footswitch ................................................. 6-18

Back Panel .............................................. 6-19.*

Wiring Locations ......................................... 6-20

Export ........................................................ 6-21

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.

IMPORT ANT INSTRUCTIONS

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General Safety Instructions

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

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.

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

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 413 Power Female Procedures 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.

WARNING

A WARNING is used for a potentially

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

CAUTION

A CAUTION is used for a potentially

hazardous 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 ALERT

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.

SECTION I

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GENERAL INFORMATION

SECTION I

GENERAL INFORMATION

1.1 Scope of Manual

This manual contains detailed troubleshooting, scheduled maintenance, maintenance, and service instructions for 413 Power Female Procedures Chair. This manual is intended to be used by Midmark’s authorized service technicians.

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).

B. Manual Use When Chair Is Malfunctioning And

Cause Is Unknown.

(1) Perform an operational test on chair (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).

examinations and procedures on female patients; especially Lithotomy procedures.

The major serviceable components of the chair are the seat actuator, seat capacitor, base actuator, base capacitor, gas spring, pan safety limit switch, seat up limit switch, seat down limit switch, base down limit switch, and the foot control which includes four foot switches.

B. Theory of Operation (See Figure 5-1, Sheets 1

and 2 for domestic wiring diagrams, Figure 5-2, Sheets 1 and 2 for export wiring diagrams, Figure 5-3 for domestic electrical schematic, and Figure 54 for export electrical schematic.)

Electrical Power:

Line voltage is supplied directly to the footswitches of the chair. Also, line voltage is always present at the receptacle (domestic units only).

Chair Operation:

Power is present at all four foot control footswitches. However, the BASE DOWN and SEAT UP switches receive their power thru the BASE UP and SEAT DOWN footswitches, respectively. So, if the BASE UP footswitch is depressed, power is removed from the BASE DOWN footswitch and if the SEAT DOWN footswitch is depressed, power is removed from the SEAT UP footswitch. This wiring setup prevents the operator from trying to run the actuator in an up and down direction simultaneously and causing damage to the actuator.

C. Manual Use When Damaged Component Is Known.

(1) Replace or adjust component in accordance

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

1.3 Description Of 413 Power Female Procedures Chair

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

The 413 Power Female Procedures Chair is an examination chair designed for performing female specific

SEAT UP function:

When the operator depresses the SEAT UP footswitch, current is applied across the seat actuator motor windings thru the normally open (N.O.) pan safety limit switch and seat capacitor, causing the seat actuator to run. The pan safety limit switch is a N.O switch. When the pan assembly is in its stowed position, the pan safety limit switch is tripped, closing the circuit and allowing the seat actuator to run. If the pan assembly is not in its stowed position, the pan safety limit switch is not tripped, which opens the circuit and prevents the seat actuator from running. This prevents the operator

SECTION I

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GENERAL INFORMATION

BASE ACTUAT OR

GAS SPRING

BASE DOWN LIMIT SWITCH

PAN SAFETY LIMIT SWITCH

SEAT DOWN LIMIT SWITCH

RETURN

AQUIRE

FOOT CONTROL

FOOT SWITCH

Figure 1-1. Major Components

from running the foot section into the pan assembly and damaging it. The seat capacitor provides motor start and motor run power for the seat actuator.

BASE DOWN function:

When the BASE DOWN footswitch is depressed, current is applied across the base actuator motor coil thru either the seat up limit switch or the base down limit switch and base capacitor, causing the base

SEAT UP LIMIT SWITCH

SEAT ACTUATOR

SEAT CAPACITOR

BASE CAPACITOR

MA317900

actuator to run. The seat up limit switch is a normally closed (N.C.) switch which is tripped when the seat function is in any position, but all the way up, resulting in an open circuit. This prevents the operator from running the BASE DOWN function (lower than the 2/3 up position - see base down limit switch operation) when the seat is in any position, but all the way up, preventing an accidental seat section collision with floor. When the seat function is raised all the way up, the seat up limit switch untrips, closing the circuit, and

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GENERAL INFORMATION

allowing the BASE DOWN function to be operated to any position.

The base down limit switch is a N.C. switch which is tripped when the base function is between the all the way down position to approximately the 2/3 up position, resulting in an open circuit. This means that the switch is untripped only when the base function is in 2/3 up position to all the way up position, resulting in a closed circuit. This only allows the operator to lower the BASE DOWN function down to the 2/3 up position. Then the base down limit switch trips, opening the circuit, and preventing further downward movement of the base actuator. This prevents an accidental seat section collision with floor. The base capacitor provides motor start and motor run power for the base actuator.

So, if the seat up limit switch is tripped (seat function

not

in all the way up position), the base down limit switch provides the base actuator with current; this allows you to lower table top only 1/3 of way down. But, if the seat up limit switch is untripped (seat function is in all the way up position), the seat up limit switch provides the base actuator with current; this allows you to lower table top all the way down.

BASE UP function:

When the BASE UP footswitch is depressed, current is applied across the base actuator motor coil and base capacitor, causing the base actuator to run. The base capacitor provides motor start and motor run power for the base actuator.

1.4 Specifications

Factual data for the 413 Female Procedures Chair is provided in Table 1-1. Also, see Figure 1-2.

Table 1-1. Specifications

Description Data

Weight:

Without Shipping Carton ................ 374 lb (169.6 kg)

With Shipping Carton ..................... 412 lb (186.9 kg)

Shipping Carton ....... 55 in. "L" x 33 in. "W" x 44 in. "H"

(139.7 cm x 83.8 cm x 111.7 cm)

Dimensions (See Figure 1-2):

Table Top Length (w/o foot section

extended) ................................... 55.5 in. (141.0 cm)

Table Top Length (w/ foot section

fully extended) ............................ 72.7 in. (184.6 cm)

Table Top Width (w/ armrests) .......... 28 in. (71.1 cm)

Maximum width of upholstery ............. 22 in. (55.9 cm)

Overall Width ..................................... 28 in. (71.1 cm)

Chair Positioning:

Seat height in chair position ................ 19 in. (48.3 cm)

Height in table position ....................... 34 in. (86.4 cm)

Maximum pelvic area height ............... 36 in. (91.4 cm)

Chair Speeds (@ 60 Hz.):

Base Up ................................................ 9 ±1 seconds

Seat Up ................................................. 9 ±1 seconds

SEAT DOWN function

When the SEAT DOWN footswitch is depressed, current is applied across the seat actuator motor coil thru the seat down limit switch and seat capacitor. The seat down limit switch is a N.C. switch which is tripped when the base function is between the all the way down position to approximately the 2/3 up position, resulting in an open circuit. This means that the switch is untripped only when the base function is in the 2/3 up position to all the way up position, resulting in a closed circuit. This only allows the operator to lower the SEAT DOWN function if the base actuator is in 2/3 up position or higher. This prevents an accidental seat section collision with floor. The seat capacitor provides motor start and motor run power for the seat actuator.

Weight Capacity (Maximum)............. 300 lb. (136.0 kg)

Electrical Requirements:

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

6 amp, single phase

230 VAC Unit...................... 220 - 240 VAC, 50/60 HZ,

5 amp, single phase

Power Consumption:

115 VAC Unit ........................................... 720 WATTS,

6 amps @ 120 VAC

230 VAC Unit........................................ 1200 WATTS,

5 amps @ 240 VAC

Recommended Circuit:

A separate (dedicated) circuit is recommended for this chair. The chair electrical circuit with other appliances or equipment unless the circuit is rated for the additional load.

should not

be connected to an

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GENERAL INFORMATION

68 in. (172.7 cm.)

53 1/4 in. (135.2 cm.)

16 in.

40.6 cm.

22 in. (55.9 cm.)

33 3/4 in. (85.7 cm.)

72 in (182.9 cm.)

100 in. (254 cm.)

19 5/8 in. (49.8 cm.)

30 3/4 in. (78.1 cm.)

Figure 1-2. Chair Dimensions

50 in. (127 cm.)

44 1/2 in. (113 cm.)

MA318000

1.5 Parts Replacement Ordering

MODEL NO. 413-00X INPUT. 120 VAC. RATING 6 AMPS 60 Hz SERIAL NO. XXXXXX

FOR SALES OR SERVICE CALL 1-800-XXX-XXXX MADE IN THE U.S.A.

MIDMARK

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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 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.

SECTION I

GENERAL INFORMATION

(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).

1.6 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.

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

MA309302

Figure 1-3. Model Number / Serial

Table 1-2. Special Tool List

Manufacturer’s

Part Number

Number Location

Purpose of Special Tool

values.

SECTION I

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GENERAL INFORMATION

TESTING AND TROUBLESHOOTING

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SECTION II

TESTING AND TROUBLESHOOTING

SECTION II

2.1 Operational Test

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.

(7) Depress BASE DOWN footswitch and lower

table top all the way down; then depress SEAT DOWN footswitch.

(8) Observe. After the BASE DOWN function is

lowered all the way down, the seat actuator should not run when the SEAT DOWN footswitch is depressed.

(9) Run BASE UP function all the way up and then

run SEAT DOWN function all the way down.

(10) Pull the pan holder assembly outward until pan

safety limit switch is no longer tripped. Depress SEAT UP footswitch and then SEAT DOWN footswitch.

(11) Observe. The seat section of table top

not

move when the SEAT UP and SEAT

DOWN footswitches are depressed.

(12) Push pan holder assembly inward until pan

safety limit switch is tripped. Depress SEAT UP and SEAT DOWN footswitches.

should

NOTE

Pan holder assembly should be pushed in fully for the following step.

(2) Depress BASE UP, SEAT DOWN, SEAT UP,

and BASE DOWN footswitches in this order.

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

direction corresponding to the footswitch which is being depressed and at the speeds listed below: Chair Speeds (@ 60 Hz.):

Base Down to Base Up in 9 +/1 seconds

Seat Down to Seat Up in 9 +/1 seconds The actuator assembly should not drift after the footswitch is released. The actuator assembly should not make excessive squealing noises.

(4) Raise BASE UP function all the way up.

(5) Depress SEAT DOWN footswitch and lower

seat section halfway. Then raise SEAT UP function all the way up.

(6) Observe. Seat actuator should run.

(13) Observe. The seat section of table top

move when the SEAT UP and SEAT DOWN footswitches are depressed.

(14) Lower the SEAT DOWN function all the way

down.

(15) Depress and hold the BASE DOWN footswitch.

(16) Observe. The BASE DOWN function should

lower approximately 1/3 of its travel and then stop.

(17) Raise the SEAT UP function all the way up.

(18) Depress the BASE DOWN footswitch.

(19) Observe. The BASE DOWN function should

lower all the way down.

(20) Pull the release handle and extend the foot

extension. Then, pull the release handle and push the foot extension back into foot section.

should

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TESTING AND TROUBLESHOOTING

RELEASE BUTTON

PAN HOLDER ASSEMBLY

SEAT

SECTION

FOOT

EXTENSION

ARM REST

Figure 2-1. Operational Test

(21) Observe. The foot extension should slide out

easily and quietly. The foot extension should automatically lock into a fully extended position. When the foot extension is pushed into the foot section, the foot extension should automatically lock into a stowed position.

RELEASE HANDLE

BASE DOWN

SEAT UP

SEAT DOWN

BASE UP

MA316500

(24) Raise arm rest upward and then release.

(25) Observe. The arm rest should automatically

lock into its normal position.

2.2 Troubleshooting Procedures

(22) Press the arm rest release button and lower the

arm rest.

(23) Observe. When the release button is pressed,

the arm rest should be able to be lowered.

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

TESTING AND TROUBLESHOOTING

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Table 2-1. Troubleshooting Guide

Problem Symptom Probable Cause Check Correction

Table will not operate when any of the Base or Seat up or down functions are selected.

SEAT UP function does not work, but SEAT DOWN function does.

SEAT DOWN function does not work, but SEAT UP function does.

When a foot control footswitch is depressed, its actuator motor does not run or hum.

When SEAT UP footswitch is depressed, nothing happens.

When SEAT DOWN footswitch is depressed, nothing happens.

Power cord is not plugged into facility wall outlet.

Facility circuit breaker providing power to chair is tripped.

One or both fuses in AC connector receptacle is blown (export models only).

Wire connections loose. Check all wiring

SEAT UP footswitch is malfunctioning.

SEAT DOWN footswitch is sticking open.

SEAT DOWN footswitch is malfunctioning.

Seat down limit switch is tripped.

Seat down limit switch is malfunctioning.

Check to see if power cord is plugged in.

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

Refer to Figure 5-2, Sheets 1 or 2 for fuse information. Perform continuity check on fuse.

connections from power cord to terminal block. Perform continuity check on wires. Use multimeter to check for proper voltage levels.

Perform continuity check on SEAT UP footswitch. When footswitch is activated, there should be continuity between COM. and N.O. terminals of footswitch.

Perform continuity check on SEAT DOWN footswitch. When footswitch is not activated, there should be continuity between COM. and N.C. terminals of footswitch.

Perform continuity check on SEAT DOWN footswitch. When footswitch is activated, there should be continuity between COM. and N.O. terminals of footswitch.

Check if seat down limit switch is tripped. Seat down limit switch should be tripped when base actuator is in all the way down position to 2/3 up position. This prevents operator from accidentally colliding seat section with floor.

Perform continuity check on N.C. seat down limit switch. Switch tripped =

Plug power cord into facility wall outlet.

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

Replace any blown fuses.

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

Replace SEAT UP footswitch. Refer to para 4.10.

Replace SEAT DOWN footswitch. Refer to para 4.10.

Raise BASE UP function until it is at least 2/3 of the way up in its travel. Then SEAT DOWN function will work. Inform operator of the seat down limit switch function.

Replace seat down limit switch. Refer to para

4.9.

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TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

SEAT UP and SEAT DOWN functions do not work.

BASE DOWN function does not work, but BASE UP function does.

When SEAT DOWN or SEAT UP footswitch is depressed, nothing happens.

When BASE DOWN footswitch is depressed, nothing happens.

Wire connections loose. Check all wiring

Treatment pan assembly is not pushed in all the way.

Pan safety limit switch is malfunctioning.

Seat capacitor is weak or blown.

Thermal overload switch in seat actuator motor is activated.

Seat actuator assembly is malfunctioning.

BASE DOWN footswitch is malfunctioning.

BASE UP footswitch is sticking open.

Base down limit switch is tripped.

connections from SEAT DOWN footswitch to terminal block. Perform continuity check on wires. Use multimeter to check for proper voltage levels.

Check if treatment pan assembly is pushed all the way in to its stowed position.

Perform continuity check on pan safety limit switch. Switch tripped = closed circuit or continuity.

Replace suspect seat capacitor with known working seat capacitor.

__ Wait 10 to 20 minutes to allow

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

Perform continuity check on BASE DOWN footswitch. When footswitch is activated, there should be continuity between COM. and N.O. terminals of footswitch.

Perform continuity check on BASE UP footswitch. When footswitch is not activated, there should be continuity between COM. and N.C. terminals of footswitch.

Check if base down limit switch is tripped. Base down limit switch will be tripped when base actuator is lowered below the 2/3 up position. This removes current from base actuator if N.C seat up limit switch is also tripped. This prevents operator from accidentally colliding seat section with floor.

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

Push treatment pan assembly all the way in. Inform operator on how this function works.

Replace pan safety limit switch. Refer to para 4.4.

Replace seat capacitor. Refer to para 4.7.

seat actuator motor to cool.

Replace seat actuator assembly. Refer to para 4.3.

Replace BASE DOWN footswitch. Refer to para

4.10.

Replace BASE UP footswitch. Refer to para 4.10.

Raise SEAT UP function all the way up to untrip seat up limit switch. Then BASE DOWN function can be lowered all the way down. Inform the operator how this function works.

TESTING AND TROUBLESHOOTING

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Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

BASE DOWN function does not work, but BASE UP function does

- Continued.

BASE UP function does not work, but BASE DOWN function does.

BASE UP and BASE DOWN functions do not work.

When BASE DOWN footswitch is depressed, nothing happens Continued.

When BASE UP footswitch is depressed, nothing happens.

When BASE UP or BASE DOWN footswitch is depressed, nothing happens.

Base down limit switch is malfunctioning.

Seat up limit switch is malfunctioning.

BASE UP footswitch is malfunctioning.

Gas spring is malfunctioning.

Wire connections loose. Check all wiring

Base capacitor is weak or blown.

Perform continuity check on N.C. base down limit switch. Switch tripped = open circuit. Base down limit switch is tripped when base actuator is in all the way down position to 2/3 up position.

Perform continuity check on N.C. seat up limit switch. Switch tripped = open circuit. Seat up limit switch is untripped only when seat section is all the way up.

Perform continuity check on BASE UP footswitch. When footswitch is activated, there should be continuity between COM. and N.O. terminals of footswitch.

Replace suspect gas spring with known working gas spring.

connections from BASE UP footswitch to terminal block. Perform continuity check on wires. Use multimeter to check for proper voltage levels.

Replace suspect base capacitor with known working base capacitor.

Replace base down limit switch. Refer to para 4.9.

Replace seat up limit switch. Refer to para 4.2.

Replace BASE UP footswitch. Refer to para

4.10.

Replace gas spring. Refer to para 4.5.

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

Replace base capacitor. Refer to para 4.7.

SECTION II

Thermal overload switch in base actuator motor is activated.

Base actuator assembly is malfunctioning.

_ Wait 10 to 20 minutes to

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

allow base actuator motor to cool.

Replace base actuator assembly. Refer to para

4.6.

SECTION II

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TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

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

Heavy patients cause table to malfunction.

Low voltage is being supplied to chair.

Table overloaded with too heavy of a patient.

Check voltage at wall receptacle - should be 115 +/- 5 VAC for domestic units and 230 +/- 10 VAC for export units.

Maximum weight capacity of table is 300 lbs (136.0 kg).

Correct low voltage situation at wall receptacle.

Inform chair operator of weight limitation.

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

Foot extension locking mechanism is malfunctioning.

Capacitor for suspect function is weak.

Noisy actuator. Foreign matter on ball

Foot extension does not lock into stowed position or extended position automatically.

screw threads and / or lack of lubricant.

Foot extension lock / unlock mechansim is malfunctioning.

Replace suspect capacitor with known working capacitor.

Check for foreign matter on ball screw threads. Check for lack of lubricant on ball screw threads.

Check to see if return spring is present. Check to see if linking rod is present.

Replace capacitor. Refer to para 4.7.

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. Refer to para 4.3 or 4.6.

Lubricate mechansim with a silicone based lubricant. Replace missing, worn, or broken return spring or linking rod.

SCHEDULED MAINTENANCE

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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/hardware 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 footswitches operate properly.

Ball screws of actuator assemblies

Inner tube of base actuator

Drifting of actuator assemblies

Foot extension Check that foot extension automatically locks into stowed and extended positions. Lubricate

Pan safety limit switch Check that pan safety limit switch is tripped when pan assembly is in fully stowed position.

Electrical receptacle (domestic units only)

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

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

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.

Replace any malfunctioning footswitches. 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. If oil does not correct a squealing actuator assembly, replace actuator assembly. Refer to para

4.3 or 4.6.

Lubricate inner tube of base actuator with vaseline.

Check each actuator assembly for drift. Replace actuator assembly brake components as necessary. Refer to para 4.8.

linkages with a silicone based lubricant.

Adjust or replace pan safety limit switch if necessary. Refer to para 4.4.

Check that the electrical receptacle is functioning properly. Replace receptacle as necessary.

necessary, repair or replace the accessory.

SECTION III

Return To Table Of Contents

SCHEDULED MAINTENANCE

MAINTENANCE / SERVICE

EARLY UNITS

LATER UNITS

EARLY UNITS

Return To Table Of Contents

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 Seat Up Limit Switch Removal / Installation

A. Removal

(1) Raise TABLE UP and SEAT UP functions all

the way up.

LATER UNITS

DANGER

Always disconnect the power cord

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

(2) Unplug chair power cord from wall outlet.

(3) Cut two cable ties and remove actuator sleeve

(1, Figure 4-1) from shaft of seat actuator (2).

(4) On early units, tag and disconnect two wires

(3A) from terminals of seat up limit switch (4). On later units, disconnect wire harness (3B) from seat up limit switch (4).

(5) Remove two nuts (5), screws (6), and seat up

limit switch (4) from switch bracket (7).

CABLE TIES

VIEW

MA316600

Figure 4-1. Seat Up Limit Switch

Removal / Installation

B. Installation

NOTE

With SEAT UP function all the way up, seat up limit switch should be untripped. Make sure seat up limit switch is installed to meet this condition.

(1) Install seat up limit switch (4) on switch bracket

(7) and secure with two screws (6) and nuts (5), making sure trip arm of switch is in cutout of seat actuator shaft (2).

SECTION IV

Return To Table Of Contents

MAINTENANCE / SERVICE

(2) On early units, connect two wires (3A) to

terminals of seat up limit switch (4). On later units, connect wire harness (3B) to seat up limit switch (4).

(3) Install actuator sleeve (1) on shaft of seat

actuator (2) and secure with two cable ties.

NOTE

The following step applies to later units only.

(7) On later units, remove two screws (9) and

partially separate receptacle bracket (10) from pivot frame (11).

(4) Plug chair power cord into wall outlet.

4.3 Seat Actuator Removal / Installation

A. Removal

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

up.

DANGER

Always disconnect the power cord

(2) Unplug chair power cord from wall outlet.

(3) Remove two cable ties and remove actuator

sleeve (1, Figure 4-2) from shaft of seat actuator (2).

(4) On early units, tag and disconnect two wires

(3A) from terminals of seat up limit switch (4). On later units, disconnect wire harness (3B) from seat up limit switch (4).

(5) Remove two screws (5), lockwashers (6), and

seat up limit switch assembly (4) from shaft of seat actuator (2).

NOTE

Early units are units with Serial Numbers BK-1000 thru BK1271 and V-1000 thru V-1575. Later units are units with Serial Numbers BK-1272, V-1576, and FH-1000 thru Present.

(8) Cut any cable ties securing wire / wire har-

nesses to seat actuator (2).

(9) While supporting seat section (1, Figure 4-3),

remove two e-rings (2), clevis pin (3), and base of seat actuator (4) from bracket (5).

(10) While supporting seat section (1), remove two

e-rings (6), spacers (7), clevis pin (8), and seat actuator (4) from bracket (9). Remove seat actuator from chair.

B. Installation

NOTE

This jam nut has left hand threads.

(1) Loosen jam nut (10, Figure 4-3); then remove

swivel joint (11) from shaft of new seat actuator (4).

(2) Coat threads of swivel joint (11) with permanent

threadlocking adhesive (Loctite 262).

(3) Screw swivel joint (11) into shaft of seat

actuator (4).

(4) While supporting seat section (1), install base

of seat actuator (4) on bracket (5) and secure with clevis pin (3) and two e-rings (2).

(5) While supporting seat section (1), install shaft

end of seat actuator (4) on bracket (9) and secure temporarily with clevis pin (8).

NOTE

The following step applies to later units only.

(6) On early units, tag and disconnect three wires

(7A) from three actuator wires (8A). On later units, disconnect wire harness (7B) from connector receptacle (8B).

(6) On later units, install receptacle bracket (10,

Figure 4-2) on pivot frame (11) and secure with two screws (9).

Return To Table Of Contents

SECTION IV

MAINTENANCE / SERVICE

VIEW

WIRING HARNESS

CABLE TIES

LATER UNITS

EARLY UNITS

Figure 4-2. Seat Actuator Wires Disconnection / Connection

(7) On early units, connect three wires (7A) to

three actuator wires (8A). On later units, connect wire harness (7B) to connector receptacle (8B).

(8) Install switch bracket assembly (4) on shaft of

seat actuator (2) and secure with two lockwashers (6) and screws (5).

(9) On early units, connect two wires (3A) to

terminals of seat up limit switch (4). On later units, connect wire harness (3B) to seat up limit switch (4).

(10) Secure wires / wire harnesses to seat actuator

(2) with a cable tie.

MA316700

(11) Install actuator sleeve (1) on shaft of seat

actuator (2) and secure with two cable ties.

(12) Run SEAT UP function all the way up and then

run TABLE DOWN function all the way down.

(13) If seat section (1, Figure 4-3)

go to step 18. If seat section (1) with floor, go to step 14.

(14) While supporting seat section (1), remove

clevis pin (8) securing swivel joint (11) of seat actuator (4) to bracket (9).

(15) Screw swivel joint (11) in or out as determined

necessary in step 13.

level with floor,

is not

level

SECTION IV

Return To Table Of Contents

MAINTENANCE / SERVICE

PARALLEL SPACING LEVEL WITH THE FLOOR

Figure 4-3. Seat Actuator Removal / Installation

(16) Connect swivel joint (11) of seat actuator (4) to

bracket (9) and secure with clevis pin (8).

(17) Repeat steps 12 thru 16 until seat section (1) is

level with floor.

(18) Install spacers (7) and two e-rings (6) on clevis

pin (8).

DANGER

Always disconnect the power cord

MA316800

(19) Tighten jam nut (10).

(20) Plug chair power cord into wall outlet.

4.4 Pan Safety Limit Switch Removal / Installation

A. Removal

(1) If possible, run seat section all the way down.

(2) Unplug chair power cord from wall outlet.

NOTE

The upholstered lower back section is held onto the lower back casting with velcro.

(3) Remove upholstered lower back section (1,

Figure 4-4) from lower back casting (2).

(4) Pull pan holder assembly (3) out as far as

possible.

VIEW

LATER UNITS

TRIP ARM

EARLY UNITS

MA316900

Return To Table Of Contents

SECTION IV

MAINTENANCE / SERVICE

Figure 4-4. Pan Safety Limit Switch Removal / Installation

NOTE

Early units are units with Serial Numbers BK-1000 thru BK1271 and V-1000 thru V-1575. Later units are units with Serial Numbers BK-1272, V-1576, and FH-1000 thru Present.

(5) On early units, tag and disconnect two wires

(4A) from pan safety limit switch (5). On later units, disconnect wire harness (4B) from pan safety limit switch (5).

(6) Remove two nuts (6), screws (7), and pan

safety limit switch (5) from pan frame (8).

B. Installation

(3) Push pan holder assembly (3) all the way in

until it locks into its fully stowed position, while observing, from under lower back casting (2), how the pan safety limit switch (5) is being tripped.

(4) Slide pan safety limit switch (5) inward or

outward as determined necessary, so that the trip arm of pan safety limit switch is tripped just before the pan holder assembly (3) locks into its fully stowed position.

(5) Repeat steps 3 and 4 until the pan safety limit

switch (5) is positioned properly. Then secure the pan safety limit switch (5) in position by tightening two nuts (6).

(1) Install pan safety limit switch (5) on pan frame

(8) and secure with two screws (7) and nuts (6). Do not tighten nuts at this time.

(2) On early units, connect one wire (4A) to N.O.

terminal and other wire (4A) to COM. terminal of pan safety limit switch (5). On later units, connect wire harness (4B) to pan safety limit switch (5).

(6) Install upholstered lower back section (1) on

lower back casting (2).

(7) Plug chair power cord into wall outlet.

SECTION IV

Return To Table Of Contents

MAINTENANCE / SERVICE

4.5 Gas Spring Removal / Installation

A. Removal

(1) If possible, raise TABLE UP and SEAT UP

functions all the way up.

WARNING

Always disconnect the power cord

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

(2) Unplug chair power cord from wall outlet.

(3) Remove seven screws (1, Figure 4-5), outer

shroud (2), and inner shroud (3) from base casting (4).

WARNING

If TABLE UP function is not all the way

up, the gas spring will be under extreme pressure. Raise table all the way up before removing gas spring mounting hardware. Failure to do so could result in serious personal injury or death.

(4) Remove two screws (5), four washers (6), and

gas spring (7) from brackets (8).

B. Installation

(1) Coat threads of two screws (5) with removable

threadlocking adhesive (Loctite 242).

(2) Install gas spring (7) on brackets (8) and

secure with four washers (6) and two screws (5).

(3) Install inner shroud (3) and outer shroud (2) on

base casting (4) and secure with seven screws (1).

(4) Plug chair power cord into wall outlet.

MA317000

Figure 4-5. Gas Spring Removal / Installation

4.6 Base Actuator Removal / Installation

Return To Table Of Contents

A. Removal

SECTION IV

MAINTENANCE / SERVICE

(1) Remove gas spring (Refer to para 4.5).

(2) Remove stirrup from patient's right side of

chair.

WARNING

Chair is heavy. Use proper lifting

techniques (and an assistant if necessary) to raise and lower chair. Failure to do so could result in back injury.

(3) Lay chair onto its right side (patients).

(4) Remove two screws (1, Figure 4-6) and gas

spring base mounting bracket (2) from base casting (3).

(5) Remove two screws (4), lockwashers (5), and

switch bracket assembly (6) from shaft of base actuator (7).

(6) Cut cable ties securing wires to base actu-

ator (7).

CABLE TIES

(7) Remove screw (8) and two cable clamps (9)

from base casting (3). Remove cable clamp (9) off of base actuator cable (10).

(8) Tag three actuator wires (11); then loosen three

terminal screws (12) and disconnect three actuator wires (11) from terminal block (13).

NOTE

Access to jam nut (1) may only be possible with a "homemade" ground down 1-1/8 in. open end wrench.

(9) Loosen jam nut (1, Figure 4-7).

NOTE

Setscrews are only on later units. Open rear access door to gain access to the rear setscrew.

(10) If present, loosen two setscrews (2).

Figure 4-6. Wires Disconnection / Connection

(11) Remove screw (3), six screws (4), and back

cover (5) from side uprights (6).

(12) While supporting seat section (7), remove two

e-rings (8) and clevis pin (9) securing base of base actuator (10) to bracket (11).

MA317100

SECTION IV

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MAINTENANCE / SERVICE

P ARALLEL SPACING

REAR ACCESS DOOR

SHAFT

MA317200

Figure 4-7. Base Actuator Removal / Installation

NOTE

Note how far threads of base actuator are screwed into chair yoke frame.

(13) While supporting seat section (7), use strap

wrench or channel lock pliers with a soft cloth to unscrew shaft of base actuator (10) from chair yoke frame (12).

B. Installation

(1) Screw jam nut (1, Figure 4-7) onto threads of

base actuator (10) fully.

(2) If unit does not have two setscrews (2), apply

permanent threadlocking adhesive (Loctite 262) to threads of base actuator (10).

(3) While supporting seat section (7), screw new

base actuator (10) into chair yoke frame (12) approximately the same distance as old base actuator used to be.

(4) While supporting seat section (7), connect base

actuator (10) to bracket (11) with clevis pin (9) and two e-rings (8).

(5) Connect three actuator wires (11, Figure 4-6) to

terminal block (13) and secure by tightening three terminal screws (12).

(6) Install one cable clamp (9) onto base actuator

cable (10); then secure both cable clamps (9) to base casting (3) with screw (8).

(7) Install switch bracket (6) on shaft of base

actuator (7) and secure with two lockwashers (5) and screws (4).

(8) Secure wires to base actuator (7) with three

cable ties.

(9) Raise chair to upright position.

SECTION IV

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MAINTENANCE / SERVICE

(10) Plug chair power cord into wall outlet.

(11) Run SEAT UP function all the way up and

TABLE DOWN function all the way down.

(12) If lower back casting (13, Figure 4-7)

with angled surface of side upright (6), go to step 16. If lower back casting (13) angled surface of side upright (6), go to step 13.

(13) Using strap wrench or channel lock pliers with a

soft cloth, screw shaft of base actuator (10) in or out of chair yoke frame (12) as determined necessary in step 12.

(14) Repeat steps 11 thru 13 until lower back

casting (13) side upright (6) when chair is in full TABLE DOWN position.

(15) Tighten jam nut (1).

parallel with angled surface of

is not

parallel

parallel with

NOTE

Setscrews are only on later units. Open rear access door to gain access to the rear setscrew.

4.7 Typical Capacitor Removal / Installation

A. Removal

(1) If possible, raise TABLE UP and SEAT UP

function all the way up.

WARNING

Always disconnect the power cord

(2) Unplug chair power cord from wall outlet.

(3) Remove seven screws (1, Figure 4-8), outer

shroud (2), and inner shroud (3) from base casting (4).

(4) Using a screwdriver, pry tab of capacitor

mounting bracket (5) outward and remove capacitor (6) from capacitor mounting bracket.

(5) Remove capacitor cap (7) from capacitor (6).

(16) If present, tighten two setscrews (2).

(17) Install back cover (5) on side uprights (6) and

secure with six screws (4) and one screw (3).

WARNING

Chair is heavy. Use proper lifting

techniques (and an assistant if necessary) to raise and lower chair. Failure to do so could result in back injury.

(18) Lay chair onto its side.

(19) Install gas spring base mounting bracket (2,

Figure 4-6) on base casting (3) and secure with two screws (1).

(20) Raise chair to upright position.

(21) Install gas spring (Refer to para 4.5).

(22) Install stirrup.

WARNING

A capacitor contains stored electricity.

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

(6) Discharge capacitor (6).

(7) Disconnect two wires (8) from terminals of

capacitor (6).

B. Installation

(1) Connect two wires (8) to terminals of capaci-

tor (6).

(2) Install capacitor cap (7) on capacitor (6).

+ 63 hidden pages

Midmark 413 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual