Midmark 647 Service And Parts Manual

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Page 1

Barrier-Free® Podiatry

Style B

Procedures Chair

Model Numbers:

647

Service and

Parts Manual

FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

Part No. 004-0579-00 Rev. 1/5/2018

Page 2

Table of ContentsTable of Contents

GENERAL INFORMATION

Symbols ....................................... iii

Ordering Parts ............................. iii

Serial Number Location ............... iii

Specications ..............................iv

Model Identication /

Compliance Chart .......................v

Scheduled Maintenance /

General InfoSection A

Cleaning Chart ...........................vi

ACCESS PROCEDURES

PC Board Cover:

Standard Base ........................C-2

Rotational Base ......................C-3

Base Shrouds:

Raising (w/ bungee cord) ........C-4

Lower / Remove / Install .........C-5

Section CSection DDigitally Linked Files

Upholstery ................................C-6

Foot Extension Covers..............C-7

Foot Slide Remove / Install .......C-9

TROUBLESHOOTING

Troubleshooting Chart ..............A-2

Power to the Chair:

Standard Base ...................... A-10

Rotational Base ....................A-12

Base Up / Down ......................A-14

Back Up / Down ...................... A-16

Tilt Up / Down .........................A-18

Crash Avoidance System .......A-20

Position Programming ............A-22

QuickExam Function ..............A-24

QuickChair Function ............... A-26

Chair Receptacles ..................A-28

Rotational Base

Brake System .......................A-29

Foot Extension ........................A-30

TESTING & ADJUSTMENTS

Primary Fuses ..........................B-2

Foot Control / Touch Pads ........ B-3

Actuators / Limit Switches:

Base .......................................B-7

Back ...................................... B-12

Tilt ......................................... B-17

Gas Springs ............................ B-22

Chair Receptacles ..................B-23

Section B

Main System Transformer ......B-24

Position Sensors .....................B-26

Main PC Board .......................B-32

Foot Extension / Limit Switch .B-35

Rot. Base Brake System ........B-37

(*) Indicates multiple pages due to model / serial number break(s).

WIRING DIAGRAMS

647:

(-001 / -002) Standard Base ...D-2 (-003 / -004) Rotation. Base ...D-3

EXPLODED VIEWS

647:

(-001 / -002) Standard Base ... E-2 (-003 / -004) Rotation. Base ...E-3

Section E

REPAIR PROCEDURES & FORMS

Actuators / Limit Switches:

Base ........................ 003-1739-00

Back ......................... 003-1738-00

Tilt ............................ 003-1915-00

Position Sensors ........ 003-1473-00

Main PC Board .......... 003-1490-00

Upper Glides .............. 003-1509-00

Rotational Base Kit .... 003-1657-00

Gas Springs ............... 003-1741-00

Parts Order Form ....... 004-0755-00

Comments Form ........ 004-0756-00

Color Selector ..... www.midmark.com

ii© Midmark Corporation 2008 SF-1925 [Revised: 2/17/09]

Page 3

General InformationGeneral Information

Symbols

Ordering Parts

DANGER

Indicates an imminently hazardous situation which will result in serious or fatal injury if not avoided. This symbol is used only the most extreme conditions.

WARNING

Indicates a potentially hazardous situation which could result in serious injury if not avoided.

Caution

Indicates a potentially hazardous situation which may result in minor or moderate injury if not avoided. It may also be used to alert against unsafe practices

Equipment Alert

Indicates a potentially hazardous situation which could result in equipment damage if not avoided.

The symbols below may be used in this manual to represent the operational status of table functions and components.

Indicates the function / component is working properly. No action required.

The following information is required when ordering parts:

 • Serialnumber&modelnumber  • Partnumberfordesiredpart

(Refer to Section E: Exploded Views & Parts Lists)

Non-warranty parts orders may be faxed to Midmark using the Fax Order Form in the back of this manual.

For warranty parts orders, call Midmark’s Technical Service Department with the required information.

Hours: 8:00 am to 5:00 p.m. EST (Monday thru Friday) Phone: 1-800-Midmark

Serial Number Location

Serial Number

Label

Indicates the function / component is working, but a problem exists.

Indicates the function is not working at all, or that the component is faulty.

iii© Midmark Corporation 2008 SF-1925 [Revised: dd/mo/yr]

MA7877i

Page 4

Specications

Patient Weight (max): 450 lbs (204 kg)

Weight of Chair: Standard Base: 421 lbs (191 kg)

Rotational Base: 506 lbs (230 kg)

Power Cord Length: 8 ft (244 cm)

Fuses (located at power cord inlet): 6.3A, 250V, Type “T”, 5 x 20 mm

Foot Control Voltage: 10 VAC, SELV (Safety Extra Low Voltage)

Chair Receptacle Maximum Load:

Duty Cycle (Motor Run Time):

Protection against

ingress of uids:

Classications: Class 1, Type B, Applied Part

Electrical Requirements: See model identication chart below

Regulatory Compliance: See model identication chart below

Equipment not suitable for use in the presence of a ammable anesthetic mixture with air, oxygen, or nitrous oxide.

115 VAC, 3 amps, 50 / 60 Hz

Intermittent Operation (30 seconds ON - 5 mintes OFF)

Ordinary Equipment Foot control only: IPX1

Back Function

Full Down: 0° +1/2° Full Up: 80° +3°

Base Function

Standard Base Full Down: 19 in. (48 cm) Full Up: 40 in. (101 cm)

Rotational Base Full Down: 22.5 in. (57 cm) Full Up: 43.5 in. (110 cm)

Tilt Function

Full Down: 0° +1/2° Full Up: 30° +2°

MA7873i

iv© Midmark Corporation 2008 SF-1925 [Revised: 7/21/09]

Page 5

Model Identication / Compliance Chart

Complies To: Electrical Ratings:

Model Description

647-001 Three-Function Chair

(Base, Back & Tilt) Non-Programmable w/Receptacles

647-002 Three-FunctionChair

(Base, Back & Tilt) Programmable w/Receptacles

647-003 Three-FunctionChair

(Base, Back & Tilt) Non-Programmable w/Rotational Base

647-004 Three-FunctionChair

(Base, Back & Tilt)

Programmable w/Rotational Base

60601-1

CAN / CSA

22.2,

#601.1-M90

60601-1-2

(EMC)

• • •

VAC

+/- 10%

115 10.5 60

115 8.5 60

Amps

Cycles

(Hz)

v© Midmark Corporation 2008 SF-1925 [Revised: dd/mo/yr]

Page 6

Scheduled Maintenance / Cleaning Chart

Interval Inspection / Service Description

Weekly

Semi-Annually

Clean upholstery with appropriate diluted bleach solution 10:1 (water: bleach)

Cleaning

Obvious Damage Visually inspect components for damage that could result in unsafe operation.

Mechanical Operation Check all mechanical functions using the foot control. Repeat using the table mounted touch pads.

Labels / Decals Replace any missing or illegible labels.

Hardware All fasteners must be present and fastened securely.

Electrical System

Wipepaintedmetal&plasticsurfaceswithacleansoftclothandmildcleaner.

Inspect power cord and all wiring for damage.

Be sure all electrical connections are tight.

Date of Service:

Location:

Service Technician:

Model Number:

Serial Number:

Notes:

vi© Midmark Corporation 2008 SF-1925 [Revised: 11/3/2017]

Page 7

Section ASection A

Troubleshooting

Troubleshooting Chart .......................A-2

Standard Base ...............................A-10

Rotational Base .............................A-12

Base Up / Down...............................A-14

Back Up / Down ...............................A-16

Tilt Up / Down ..................................A-18

Crash Avoidance System ................A-20

Position Programming .....................A-22

QuickExam Function .......................A-24

QuickChair Function ........................A-26

Chair Receptacles ...........................A-28

Rotational Base Brake System ........A-29

Foot Extension.................................A-30

Troubleshooting Chart .......................A-2

Standard Base ...............................A-10

Rotational Base .............................A-12

Base Up / Down...............................A-14

Back Up / Down ...............................A-16

Tilt Up / Down ..................................A-18

Crash Avoidance System ................A-20

Position Programming .....................A-22

QuickExam Function .......................A-24

QuickChair Function ........................A-26

Chair Receptacles ...........................A-28

Rotational Base Brake System ........A-29

Foot Extension.................................A-30

A-1© Midmark Corporation 2008 SF-1925 [Revised: dd/mo/yr]

Page 8

Troubleshooting Chart

Problem Symptom Probable Cause Check Correction

No functions will operate.

Power light is OFF. Facility supply voltage. Powercordconnections&

facility circuit breaker.

Primary fuse(s) blown. Inspect fuses. Replace faulty fuse(s).

Main system transformer Wire connections between:

power inlet and main PC board.

Models w/Rotational Base:

Wire connections between: rotational base PC board and transformer.

Main PC board If main system transformer is

OK...

Power light is ON. Foot control / touch pad Try activating functions from

each touch pad / foot control.

Secure power cord connections. Reset circuit breaker if necessary.

Secure loose connections. If connections are OK, test the transformer. Refer to: Section B -

Main System Transformer

Secure loose connections. If connections are OK, perform

EMI Filter Board Test.

Refer to: Section B -

Rotational Base Brake System.

Replace main PC board.

Refer to: Section B -

Foot Control / Touch Pads

Base function not operating properly.

Models:

Serial Numbers:

647

all

System malfunction Error code LEDs on main PC

board.

No Base Up or Base Down Foot control / touch pad Try activating functions from

each touch pad / foot control.

System malfunction Error code LEDs on main PC

board.

Loose / damaged wire connections Check wire connections to:

base actuator, base limit

switches.Checkblack&white

wire connections between

mainsystemtransformer&

main PC board.

Base actuator / main PC board

Refer to: Section B - Base

Actuator / Limit Switches (Isolating a Malfunction)

Refer to:

Section B - Main PC Board.

Refer to: Section B -

Foot Control / Touch Pads

Refer to:

Section B - Main PC Board.

Secure any loose connections.

Follow test sequence outlined in Section B.

[Revised: dd/mo/yr]

A-2© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 9

Problem Symptom Probable Cause Check Correction

Base function not operating properly. - continued

No Base Up. Base Down-OK.

Foot control / touch pad Try activating functions from

each touch pad / foot control.

Refer to: Section B -

Foot Control / Touch Pads

-OR-

No Base Down. Base Up-OK.

Base drifts down. Baseactuator&gassprings With no weight on table, does

Noisy operation (grinding, squeaking, etc.)

System malfunction Error code LEDs on main PC

board.

(No Base Down) Crash Avoidance System

(No Base UP):

Base Up limit switch

(No Base Down):

Base Down limit switch

(No Base Down)

Foot extension switch

Base actuator / main PC board

Gas springs / scissor mechanism -

Base actuator

Refer to: Section A -

Crash Avoidance System

Wire connections to limit switch.

Remove any obstructions under foot section of table.

Refer to: Section B - Base

Actuator / Limit Switches (Isolating a Malfunction)

base still drift down?

Refer to: Section B - Base

Actuator / Limit Switches (Isolating a Malfunction)

Refer to:

Section B - Main PC Board.

Determine appropriate test procedure(s) based on the theory of operation for the Crash Avoidance System.

If connections are OK, perform Limit Switch Test. Refer to: Section B -

Base Actuator / Limit Switch

Perform “Crash” Limit Switch Test. Refer to: Section B - Foot Extension / “Crash” Limit Switch.

Follow test sequence outlined in Section B.

IfYES,replacemotorcoupler&

gas springs. If NO, replace base actuator. Refer to: Section B - Base

Actuator / Limit Switches

Clean / lubricate gas spring pivot joints. Wipe guide bars with a clean, dry cloth. NEVER lubricate guide bars or scissor mechanism! Refer to: Section B - Gas Springs

Follow instructions outlined in Section B.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-3© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 10

Problem Symptom Probable Cause Check Correction

Base function not operating properly. - continued

Base function moves slowly, and/or will not lift patient.

Patient exceeded 450 lb weight limit

- Inform staff that max patient weight is 450 lbs.

Back function not operating properly.

Low voltage to table

Base actuator motor

Gas springs If actuator motor is OK... Replace gas springs.

Basefunctionmovesbriey,then

stops (“beeps”).

No Back Up or Back Down Foot control / touch pad Try activating functions from

Main PC board needs to be calibrated

System malfunction Error code LEDs on main PC

Base position sensor

Base actuator / main PC board

Check supply voltage. Required: 115 VAC +10%

Perform Actuator Motor Test. Refer to: Section B - Base

Actuator / Limit Switches

Calibrate main PC board

board.

Wire connections to sensor. Perform Output Voltage Test (at

Sensor). Refer to: Section B -

Position Sensors

Perform Actuator Motor Test. Refer to: Section B - Base

Actuator / Limit Switches

each touch pad / foot control.

Connect adequate supply voltage.

Follow test sequence outlined in Section B.

Refer to: Section B - Gas Springs

Refer to:

Section B - Main PC Board.

Refer to:

Section B - Main PC Board.

Follow test sequence outlined in Section B.

Refer to: Section B -

Foot Control / Touch Pads

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Loose / damaged wire connections Check wire connections to:

backactuator&backlimit

switches.Check wire connections between main system

transformer&mainPCboard (black&whitewires).

Back actuator / main PC board

Refer to: Section B -

Back Actuator / Limit Switches (Isolating a Malfunction)

A-4© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Secure any loose connections.

Follow test sequence outlined in Section B.

Page 11

Problem Symptom Probable Cause Check Correctio

Back function not operating properly. - continued

No Back Up. Back Down-OK.

Foot control / touch pad Try activating functions from

each touch pad / foot control.

Refer to: Section B -

Foot Control / Touch Pads

-OR-

No Back Down. Back Up-OK.

Back drifts down. Back actuator / motor coupler

Noisy operation (grinding, squeaking, etc.)

Back function moves slowly, and/or will not lift patient.

(No Back Down) Crash Avoidance System

(No Back UP)

Back Up limit switch

(No Back Down)

Back Down limit switch

Back actuator / main PC board

Back actuator

Patient exceeded 450 lb weight limit

Low voltage to table

Back actuator motor

Refer to: Section A -

Crash Avoidance System

Wire connections to limit switch.

Refer to: Section B - Back

Actuator / Limit Switches (Isolating a Malfunction)

Refer to: Section B - Back

Actuator / Limit Switches (Isolating a Malfunction)

- Inform staff that max patient

Check supply voltage. Required: 115 VAC +10%

Perform Actuator Motor Test. Refer to: Section B - Back

Actuator / Limit Switches

Determine appropriate test procedure(s) based on the theory of operation for the Crash Avoidance System.

Replace back limit switch / bracket assembly. Refer to:

Section B - Back Actuator / Limit Switches

Follow test sequence outlined in Section B.

Replace motor coupler. Refer to: Section B - Back

Actuator / Limit Switches

Follow instructions outlined in Section B.

weight is 450 lbs.

Connect adequate supply voltage.

Follow test sequence outlined in Section B.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-5© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 12

Problem Symptom Probable Cause Check Correction

Back function not operating properly. - continued

Tilt function not operating properly.

Backfunctionmovesbriey,then

stops (“beeps”).

No Tilt Up or Tilt Down Foot control / touch pad Try activating functions from

Main PC board needs to be calibrated

Back position sensor

Back actuator / main PC board

Calibrate main PC board Refer to:

Wire connections to sensor. Perform Output Voltage Test (at

Sensor). Refer to: Section B -

Position Sensors

Perform Actuator Motor Test. Refer to: Section B -

Back Actuator / Limit Switches

each touch pad / foot control.

Section B - Main PC Board

Follow test sequence outlined in Section B.

Refer to: Section B -

Foot Control / Touch Pads

No Tilt Up. Tilt Down-OK.

-OR-

No Tilt Down. Tilt Up-OK.

Loose / damaged wire connections Check wire connections to:

tilt actuator, tilt down limit switch.

Tilt actuator / main PC board

Foot control / touch pad Try activating functions from

(No Tilt Up)

Tilt position sensor

(No Tilt Down)

Tilt Down limit switch

Tilt actuator / main PC board

Refer to: Section B -

Tilt Actuator / Limit Switch (Isolating a Malfunction)

each touch pad / foot control.

Refer to: Section A -

Tilt Up/Down Function (Tilt Up Operation) for description of proper operation.

Wire connections to limit switch. If connections are OK,

Refer to: Section B - Tilt

Actuator / Limit Switch (Isolating a Malfunction)

Secure any loose connections.

Follow test sequence outlined in Section B.

Refer to: Section B -

Foot Control / Touch Pads

Perform Output Voltage Test (at

Sensor). Refer to: Section B -

Position Sensors

perform Limit Switch Test. Refer to: Section B -

Tilt Actuator / Limit Switch

Follow test sequence outlined in Section B.

Models:

Serial Numbers:

647

all

[Revised: 1/6/09]

A-6© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 13

Problem Symptom Probable Cause Check Correction

Tilt function not operating properly. - continued

Seat drifts down. Tilt actuator / motor coupler Replace motor coupler.

Refer to: Section B -

Tilt Actuator / Limit Switch

Noisy operation (grinding, squeaking, etc.)

Tilt function moves slowly, and/or will not lift patient.

Tilt actuator

Patient exceeded 450 lb weight limit

Refer to: Section B - Tilt

Actuator / Limit Switch (Isolating a Malfunction)

- Inform staff that max patient

Follow instructions outlined in Section B.

weight is 450 lbs.

Multiple functions are inoperable. Table “beeps”.

Programming feature does not work properly.

Tiltfunctionmovesbriey,then

stops (“beeps”).

Inoperable functions may include any of the following: Base Down,

Back Down, Tilt Up, Tilt Down

Positions cannot be programmed.

- or -

When position button is pressed, table does not move, or moves to wrong position.

Low voltage to table

Tilt actuator motor

Main PC board needs to be calibrated

Tilt position sensor

Tilt actuator / main PC board

Crash Avoidance System Refer to: Section A -

Programming failed. - Reprogram desired position.

Programming process error. Error code LEDs on main PC

Main PC board needs to be calibrated

Check supply voltage. Required: 115 VAC +10%

Perform Actuator Motor Test. Refer to: Section B - Tilt

Actuator / Limit Switch

Calibrate main PC board

Wire connections to sensor. Perform Output Voltage Test

(at Sensor). Refer to: Section

B - Position Sensors

Perform Actuator Motor Test. Refer to: Section B -

Tilt Actuator / Limit Switch

Crash Avoidance System

board.

Calibrate main PC board

Connect adequate supply voltage.

Follow test sequence outlined in Section B.

Refer to:

Section B - Main PC Board

Follow test sequence outlined in Section B.

Determine appropriate test procedure(s) based on the theory of operation for the Crash Avoidance System.

Refer to:

Section A - Position Programming

Refer to:

Section B - Main PC Board

Refer to:

Section B - Main PC Board

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-7© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 14

Problem Symptom Probable Cause Check Correction

Rotational base is malfunctioning.

Rotational brake will not lock. Rotational brake mechanism Unplug table power cord.

If base rotation locks, perform

Rot. Brake Electrical Test.

If base does not lock, inspect the mechanical brake components.

Refer to: Section B - Rotational

Base Brake System.

Base wobbles when locked.

- and/or -

Grinding noise when base rotates.

Rotational brake will not unlock. Brake pedal switch Check both brake pedals.

Debrisbetweenupper&lower

castings.

Loose hub screws

Rotation bearings / brake disc

Electro-magnet

- Without separating the castings,

Four screws securing the upper&lowercastings.

For access instructions, refer to: Section B - Rotational Base

Brake System (Separating Upper & Lower Base Castings)

Inspectneedlebearing&

brake disc for damage, debris, etc.

For access instructions, refer to: Section B - Rotational base

Brake System (Separating Upper & Lower Base Castings)

Perform Electro-magnet Test. Refer to: Section B - Rotational Base Brake System.

Follow test sequence outlined in Section B.

remove any debris.

Tighten screws.

Remove debris or replace base if necessary.

If either pedal works properly, check connections to faulty pedal switch. Replace switch if

necessary. Refer to: Section B -

Rotational Base Brake System.

Follow test sequence outlined in Section B.

Models:

Serial Numbers:

647

all

[Revised: 6/2/16]

A-8© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 15

Problem Symptom Probable Cause Check Correction

No power at chair receptacles.

Foot extension malfunctioning.

There is power to the chair, but no power at the chair receptacles.

Foot extension will not lock in place.

- or -

Foot extension will not release.

Loose / damaged wire connections

Isolation transformer / receptacles

Foot extension locking mechanism malfunctioning.

Wire connections between

powerinlet&tablereceptacles

Perform Output Voltage Test. Refer to: Section B -

Chair Receptacles / Isolation Transformer

Perform Locking Mechanism

Inspection.

Refer to: Section B - Foot Extension.

Secure / repair wire connections.

Follow test sequence outlined in Section B.

Follow instructions outlined in Section B.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-9© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 16

Power to the Chair (models w/Standard Base)

No functions will operate ...................A-2No functions will operate ...................A-2

This illustration shows only the components that affect ALL CHAIR FUNCTIONS. Refer to the following page for a detailed description of the power supply to the chair.

8-10 VAC

P9 P10

J15

GN / YL

[Red & orange wires supply 34-37 VAC to power circuitry for the Tilt actuator, foot control, touch pads, power light, all limit switches, and position sensors]

GN / YL

J4J3

J8J7J6J5

Main PC

Board

J10J9

J11

J12

J18

J13

J14

MA7838i

[Black & white wires supply 48-54 VAC to power circuitry for the Base & Back actuators]

Main System Transformer

BR / WH

BL / WH

Power

Inlet

8-10 VAC

If power light is OFF, there is no power to PC board. If power light is ON, proper voltage is present at PC board.

P12

Power

Light

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-10© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 17

Power to the Chair (models w/Standard Base)

Facility Supply Voltage

WIth the chair’s power cord properly connected, facility supply voltage (115 VAC) is supplied thru the cord to the power inlet.

Power Inlet

The voltage setting displayed in the power inlet window must match facility supply voltage (115 VAC).

Currentowsthrutwofusesinthepowerinlet,tothemainsystemtransformer.

Main System Transformer

Note

This transformer is protected from overload by a thermal cutout feature. This will automatically reset when the transformer cools.

Line voltage (115 VAC) is supplied to the main system transformer. The trans-

formerreducesthevoltageandcurrentowstothemainPCboardthrutwo

separate windings (four wires).

[The black & white wires supply 48-54 VAC to power circuitry for the Base & Back actuators only]

[The red & orange wires supply 34-37 VAC to power circuitry for the Tilt actuator, foot control, touch pads, power light, all limit switches, and position sensors].

Equipment Alert

Voltage setting displayed in the power inlet window must match facility supply voltage (115 VAC).

115V

MA7840i

Power Indicator Light

When voltage is applied to the PC board, the power light is illuminated.

Main PC Board Circuitry on the PC board provides the required voltage to power all of the table’s components: foot control, actuators, limit switches, and position sensors.

Foot Control / Touch Pads

Circuitry on the main PC board supplies 8-10 VAC to the foot control

&touchpads.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-11© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 18

Power to the Chair (models w/Rotational Base)

No functions will operate ...................A-2No functions will operate ...................A-2

This illustration shows only the components that affect ALL CHAIR FUNCTIONS. Refer to the following page for a detailed description of the power supply to the chair.

[Black & white wires supply 48-54 VAC to power circuitry for the Base & Back actuators]

[Red & orange wires supply 34-37 VAC to power circuitry for the Tilt actuator, foot control, touch pads, power light, all limit switches, and position sensors]

J15

GN / YL

J10J9

8-10 VAC

J11

J12

P12

J13

J14

If power light is OFF, there is no power to PC board. If power light is ON, proper voltage is present at PC board.

8-10 VAC

J4J3

J8J7J6J5

Main PC

Board

J18

Power

Light

Rotational

Base

PC Board

J10

Main System

Transformer

BR/WH

BL/WH

J12

GN / YL

EMI Filter

PC Board

J2 J3

MA7839i

Power Inlet

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-12© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 19

Power to the Chair (models w/Rotational Base)

Facility Supply Voltage

WIth the chair’s power cord properly connected, facility supply voltage (115 VAC) is supplied thru the cord to the power inlet.

Power Inlet / EMI Filter Board

The voltage setting displayed in the power inlet window must match facility supply voltage (115 VAC).

CurrentowsfromthepowerinletthrutheEMIlterboard,then

back thru the power inlet fuses to the rotational base PC board.

Rotational Base PC Board

CurrentowsthrutherotationalbasePCboardtothemainsystem transformer.Thetransformerreducesthevoltageandcurrentows

back to the rotational base PC board.

Circuitry on the rotational base PC board provides the required voltage to power the rotational base brake system.

The reduced voltage is supplied to the main PC board thru the rotational bse PC board.

Main System Transformer

Note

This transformer is protected from overload by a thermal cutout feature. This will automatically reset when the transformer cools.

Line voltage (115 VAC) is supplied to the main system transformer thru the rotational base PC board. The transformer reduces the volt-

ageandcurrentowsbacktotherotationalbasePCboard,thento

the main PC board thru two separate windings (four wires).

Equipment Alert

Voltage setting displayed in the power inlet window must match facility supply voltage (115 VAC).

115V

MA7840i

Main System Transformer - continued

[The black & white wires supply 48-54 VAC to power circuitry for the Base & Back actuators only]

[The red & orange wires supply 34-37 VAC to power circuitry for the Tilt actuator, foot control, touch pads, power light, all limit switches, and position sensors].

Power Indicator Light

When voltage is applied to the PC board, the power light is illuminated.

Main PC Board Circuitry on the PC board provides the required voltage to power all of the table’s components: foot control, actuators, limit switches, and position sensors.

Foot Control / Touch Pads

CircuitryonthemainPCboardsupplies8-10VACtothefootcontrol&touchpads.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-13© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 20

Base UP / DOWN Function

No Base Up or Base Down................A-2

No Base Up. Base Down - OK ..........A-3

No Base Down. Base Up - OK ..........A-3

Base drifts down ................................A-3

Noisy operation

(grinding, squeaking, etc) ................A-3

Function moves slowly, and/or

will not lift patient .............................A-4

Function moves briey,

then stops and “beeps” ....................A-4

No Base Up or Base Down................A-2

No Base Up. Base Down - OK ..........A-3

No Base Down. Base Up - OK ..........A-3

Base drifts down ................................A-3

Noisy operation

(grinding, squeaking, etc) ................A-3

Function moves slowly, and/or

will not lift patient .............................A-4

Function moves briey,

then stops and “beeps” ....................A-4

This illustration shows only the components that affect the Base UP / DOWN function. Refer to the following page for a detailed description of Base UP / DOWN operation.

Base

Actuator

Choke

J15

Models:

Serial Numbers:

J4J3

[Black & white wires supply 48-54 VAC to power circuitry for the Base & Back actuators]

Main System

Transformer

647

all

[Revised: dd/mo/yr]

J8J7J6J5

Main PC

Board

J18

J10J9

J11

J12

J13

J14

MA7841i

P12

P13

Note: On models w/rotational base, the main system transformer connections are supplied thru the Rotational Base PC board (not shown).

[Only the wires that affect this function are shown]

If power light is OFF: Refer to ‘Power to the Table’ for troubleshooting.

Power

Light

If power light is ON: Proper voltage is present at PC board.

1 2 3

COM NC NO

Base Sensor

Base Up

Limit Switch

Base Down

Limit Switch

BN BK

A-14© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 21

Base UP / DOWN Function

Is there power to the table?

When voltage is present at the PC board, the power light is illuminated.

[Refer to ‘Power to the Table’ (page A-2) for

description of current ow to the PC board].

Power to Foot Control / Touch Pads

Circuitry on the PC board supplies 8-10 VAC

tothefootcontrol&touchpads.

Base Up Operation

When the Base Up function is activated, current

owsthruthefootcontrol/touchpadstothe

main PC board. Circuitry on the main PC board supplies approximately 48 VDC to the base actuator motor.

The actuator motor runs and raises the table.

Note

The main PC board continuously monitors the base up limit switch and the base position sensor.

If the base up limit switch is tripped (open), the Base Up function will not operate.

If the base position sensor detects that that table has reached its upper limit, the Base Up function will not operate.

Actuator motor runs until:

1. Foot control / touch pad button is released.

2. Base Up limit switch is tripped.

3. Emergency Stop button is pressed.

4. Position sensor detects upper limit.

5. Overcurrent protection tripped

6. Software timeout is reached (25 seconds).

Base Down Operation

When the Base Down function is activated,

currentowsthruthefootcontrol/touchpads

to the main PC board. Circuitry on the main PC board supplies approximately 48 VDC to the base actuator motor.

The actuator motor runs and lowers the table.

Note

The main PC board continuously monitors the base down limit switch and the base position sensor.

If the base down limit switch is tripped (open), the Base Down function will not operate.

If the base position sensor detects that the table is in a potential “crash position”, or that the base has reached its lower limit, the Base Down function will not operate*.

Actuator motor runs until:

1. Foot control / touch pad button is released.

2. Base Down limit switch is tripped.

3. Crash Avoidance System activated*.

4. Emergency Stop button is pressed.

5. Position sensor detects lower limit.

6. Overcurrent protection tripped

7. Software timeout is reached (25 seconds).

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

* Refer to Section A: Crash Avoidance System

for a detailed description of “crash position”,

and the functions that are disabled.

A-15© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 22

Back UP / DOWN Function

No Back Up or Back Down ................A-4

No Back Up. Back Down - OK ...........A-5

No Back Down. Back Up - OK ...........A-5

Back drifts down ................................A-5

Noisy operation

(grinding, squeaking, etc) ................A-5

Function moves slowly, and/or

will not lift patient .............................A-5

Function moves briey,

then stops and “beeps” ....................A-6

No Back Up or Back Down ................A-4

No Back Up. Back Down - OK ...........A-5

No Back Down. Back Up - OK ...........A-5

Back drifts down ................................A-5

Noisy operation

(grinding, squeaking, etc) ................A-5

Function moves slowly, and/or

will not lift patient .............................A-5

Function moves briey,

then stops and “beeps” ....................A-6

This illustration shows only the components that affect the Back UP / DOWN function. Refer to the following page for a detailed description of Back UP / DOWN operation.

Back

Actuator

Choke

J15

J4J3

Main System

Transformer

Note: On models w/rotational base, the main system transformer connections are supplied thru the Rotational Base PC board (not shown).

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

J8J7J6J5

Main PC

Board

J18

J10J9

J11

J12

J13

J14

MA7842i

[Black & white wires supply 48-54 VAC to power circuitry for the Base & Back actuators]

If power light is OFF: Refer to ‘Power to the Table’ for troubleshooting.

If power light is ON: Proper voltage is present at PC board.

P12

P11

Power

Light

[Only the wires that affect this function are shown]

3 3

NC NO COM

Back Position Sensor

Back Up

Limit Switch

Back Down

Limit Switch

A-16© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 23

Back UP / DOWN Function

Is there power to the table?

When voltage is present at the PC board, the power light is illuminated.

[Refer to ‘Power to the Table’ (page A-2) for

description of current ow to the PC board].

Power to Foot Control / Touch Pads

Circuitry on the PC board supplies 8-10 VAC

tothefootcontrol&touchpads.

Back Up Operation

When the Back Up function is activated, current

owsthruthefootcontrol/touchpadstothe

main PC board. Circuitry on the main PC board supplies approximately 48 VDC to the back actuator motor.

The actuator motor runs and raises the back section.

Note

The main PC board continuously monitors the back up limit switch and the back position sensor.

If the back up limit switch is tripped (closed), the Back Up function will not operate.

If the back position sensor detects that the back has reached its upper limit, the Back Up function will not operate.

Actuator motor runs until:

1. Foot control / touch pad button is released.

2. Back Up limit switch is tripped.

3. Emergency Stop button is pressed.

4. Position sensor detects upper limit.

5. Overcurrent protection tripped

6. Software timeout is reached (30 seconds).

Back Down Operation

When the Back Down function is activated, currentowsthruthefootcontrol/touchpads to the main PC board. Circuitry on the main PC board supplies approximately 44 VDC to the back actuator motor.

The actuator motor runs and lowers the back section.

Note

The main PC board continuously monitors the back down limit switch and the back position sensor.

If the back down limit switch is tripped (open), the Back Down function will not operate.

If the back position sensor detects that the table is in a potential “crash position”, or that the back section has reached its lower limit, the Back Down function will not operate*.

Actuator motor runs until:

1. Foot control / touch pad button is released.

2. Back Down limit switch is tripped.

3. Crash Avoidance System activated*.

4. Emergency Stop button is pressed.

5. Position sensor detects lower limit.

6. Overcurrent protection tripped

7. Software timeout is reached (30 seconds).

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

* Refer to Section A: Crash Avoidance System

for a detailed description of “crash position”,

and the functions that are disabled.

A-17© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 24

Tilt UP / DOWN Function

No Tilt Up or Tilt Down ......................A-6

No Tilt Up. Tilt Down - OK .................A-6

No Tilt Down. Tilt Up - OK .................A-6

Seat drifts down .................................A-7

Noisy operation

(grinding, squeaking, etc) ................A-7

Function moves slowly, and/or

will not lift patient .............................A-7

Function moves briey,

then stops and “beeps” ....................A-7

No Tilt Up or Tilt Down ......................A-6

No Tilt Up. Tilt Down - OK .................A-6

No Tilt Down. Tilt Up - OK .................A-6

Seat drifts down .................................A-7

Noisy operation

(grinding, squeaking, etc) ................A-7

Function moves slowly, and/or

will not lift patient .............................A-7

Function moves briey,

then stops and “beeps” ....................A-7

This illustration shows only the components that affect the Tilt UP / DOWN function. Refer to the following page for a detailed description of Tilt UP / DOWN operation.

Tilt

Actuator

J4J3

Main PC

Board

J15

If power light is OFF:

Models:

Serial Numbers:

Refer to ‘Power to the Table’ for troubleshooting.

If power light is ON: Proper voltage is present at PC board.

647

all

[Revised: dd/mo/yr]

[Only the wires that affect this function are shown]

5 5

J8J7J6J5

J18

J10J9

J11

J12

J13

J14

P11

P12

YL / WH

Power

Light

4 3

[not used]

2 1

[Connected to Back Limit Switch Harness]

3 2 1

1 1

COM NC

Tilt Down

Limit Switch

Tilt Position Sensor

A-18© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 25

Tilt UP / DOWN Function

Is there power to the table?

When voltage is present at the PC board, the power light is illuminated.

[Refer to ‘Power to the Table’ (page A-2) for

description of current ow to the PC board].

Power to Foot Control / Touch Pads

Circuitry on the PC board supplies 8-10 VAC

tothefootcontrol&touchpads.

Tilt Up Operation

When the Tilt Up function is activated, current

owsthruthefootcontrol/touchpadtothemain

PC board. Circuitry on the main PC board supplies approximately 48 VDC to the tilt actuator motor.

The actuator motor runs and raises the seat section.

Note

The main PC board continuously monitors the tilt position sensor.

When the tilt position sensor detects that the seat section has reached its upper limit, or that the table is in a potential “crash position”, the Tilt Up function will not operate*.

Actuator motor runs until:

1. Foot control / touch pad button is released.

2. Crash Avoidance System activated*.

3. Emergency Stop button is pressed.

4. Position sensor detects upper limit.

5. Overcurrent protection tripped

6. Software timeout is reached (30 seconds).

Tilt Down Operation

When the Tilt Down function is activated, currentowsthruthefootcontrol/touchpad to the main PC board. Circuitry on the main PC board supplies approximately 48 VDC to the tilt actuator motor.

The actuator motor runs and lowers the seat sectionbacktoaatposition.

Note

The main PC board continuously monitors the tilt down limit switch and the tilt position sensor.

If the tilt down limit switch is tripped (open), the tilt Down function will not operate.

If the tilt position sensor detects that the table is in a potential “crash position”, or that the seat section has reached its lower limit, the Tilt Down function will not operate*.

Actuator motor runs until:

1. Foot control / touch pad button is released.

2. Tilt Down limit switch is tripped.

3. Crash Avoidance System activated*.

4. Emergency Stop button is pressed.

5. Position sensor detects lower limit.

6. Overcurrent protection tripped

7. Software timeout is reached (30 seconds).

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

* Refer to Section A: Crash Avoidance System

for a detailed description of “crash position”,

and the functions that are disabled.

A-19© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 26

Crash Avoidance System

Multiple functions are inoperable

(chair “beeps”) .................................A-7

Multiple functions are inoperable

(chair “beeps”) .................................A-7

The Crash Avoidance System prevents damage to the table by disabling certain functions if a potential crash position is detected.

This illustration shows only the components that are monitored by the Crash Avoidance System. Refer to the following page for a detailed description of “crash position” and how the system functions.

[Only the wires that affect this function are shown]

If actuator(s) are not working properly, refer to that section for troublshooting (ex. Base Up / Down).

[Connected to Tilt Down Limit Switch Harness]

[not used]

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

If power light is OFF: Refer to ‘Power to the Table’ for troubleshooting.

If power light is ON: Proper voltage is present at PC board.

[Connected to Back Limit Switch Harness]

A-20© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 27

Crash Avoidance System

When are functions disabled?

The main PC board continuously monitors the three position sensors, as well as the foot extension switch.

Based on the position sensor readings, circuitry on the main PC board estimates the position of the back section. If the estimated position

indicatesapotentialcollisionwiththeoor,the

Base Down, Tilt Up, and/or Back Down functions are disabled.

If the foot extension switch is tripped* (open), the Base Down and Tilt Down functions will be disabled.

[* The foot extension switch is tripped when upward pressure is applied to the foot section].

When are functions restored?

Functionality is restored when one or more of the axis are moved out of the potential crash position, and / or when the foot extension switch is no longer tripped (closed).

What is “Crash Position”?

The table is considered to be in a potential crash position when:

A. The Base, Back, and Tilt position sensors indicate that the back section is  approximatelyxin(xxcm)fromtheoor.

B. The foot extension switch is tripped (open). [This is designed to prevent damage due to objects being trapped under the foot section].

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-21© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 28

Position Programming

Positions cannot be programmed ......A-7

Chair does not move .......................A-7

Chair moves to wrong position ........A-7

Positions cannot be programmed ......A-7

Chair does not move .......................A-7

Chair moves to wrong position ........A-7

The programming feature allows the user to store up to three frequently used table positions.

This illustration shows only the components that affect the position programming. Refer to the following page for a detailed description of this feature.

If actuator(s) are not working properly, refer to that section for troublshooting (ex. Base Up / Down).

[Only the wires that affect this function are shown]

J15

Models:

647

Serial Numbers:

J4J3

all

[Revised: dd/mo/yr]

J8J7J6J5

Main PC

Board

J18

J10J9

J11

J12

J13

J14

MA7845i

Power

Light

YL / WH

VI YL

If power light is OFF: Refer to ‘Power to the Table’ for troubleshooting.

If power light is ON: Proper voltage is present at PC board.

4 3 2 1

1 1

3 2 1

BR YL

VI GY YL

Base Position Sensor

3 2 1

1 2 3

Tilt Position Sensor

Back Position Sensor

A-22© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 29

Position Programming

When are functions disabled?

The three position sensors continuously monitor

thepositionofeachaxis(Base,Back,&Tilt).

This information is transmitted to the PC board.

When a table position is properly programmed into the PC board’s memory, the position of each axis is recorded based on the readings from the position sensors.

Recalling a programmed position

When a programmed position is recalled, the PC board activates the required functions (all at the same time) until the readings from the position sensors match those of the recorded position.

To program a table position...

A) Move the table to desired position. B) Press the Program button (one “beep”). C) Press the desired Position button (1, 2, or 3). (three “beeps”)

Tip: You must press the desired Position button within five seconds of pressing the Program button.

To recall a table position...

Press the desired Position button (1, 2, or 3) momentarily.

Note: In the event of a malfunction, press the Stop button to terminate movement.

Stop

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Program

Position Buttons

Position

Button

Program

Stop

A-23© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Position Buttons

Page 30

QuickExam Function

ThisfunctionactivatestheBaseUp&TiltUpfunctionssimultaneouslytomovethetableinto“examposition”.

This illustration shows only the components that affect the QuickExam function. Refer to the following page for a detailed description of this feature.

[Only the wires that affect this function are shown]

If actuator(s) are not working properly, refer to that section for troublshooting (ex. Base Up / Down).

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

If power light is OFF: Refer to ‘Power to the Table’ for troubleshooting.

If power light is ON: Proper voltage is present at PC board.

A-24© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 31

QuickExam Function

What is “Exam Position”?

Base: all the way up Tilt: all the way up Back: any position

How it works...

WhentheQuickExambuttonispresssed&held, the PC board activates the following functions:

Function Runs until...

Base Up Base Up limit switch is tripped Tilt Up Tilt position sensor indicates seat is all the way up

Stop

Models:

647

To activate the QuickExam function...

A) Press & hold the QuickExam button. B) Release button when table reaches desired position.

Note: In the event of a malfunction, press the Stop button.

QuickExam

Serial Numbers:

all

[Revised: dd/mo/yr]

A-25© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 32

QuickChair Function

ThisfunctionactivatestheBaseDown,BackUp,&TiltDownfunctionssimultaneouslytomovethetableinto“chairposition”.

This illustration shows only the components that affect the QuickChair function. Refer to the following page for a detailed description of this feature.

[Only the wires that affect this function are shown]

If actuator(s) are not working properly, refer to that section for troublshooting (ex. Base Up / Down).

Models:

Serial Numbers:

If power light is OFF: Refer to ‘Power to the Table’ for troubleshooting.

If power light is ON: Proper voltage is present at PC board.

647

all

[Revised: dd/mo/yr]

[Back Down limit switch does not affect this function]

[Base Up limit switch does not affect this function]

A-26© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 33

QuickChair Function

What is “Chair Position”?

Base: all the way down Tilt: all the way down Back: all the way up

How it works...

WhentheQuickChairbuttonispresssed&held, the PC board activates the following functions:

Function Runs until...

Base Down Base Down limit switch is tripped Tilt Down Tilt Down limit switch is tripped Back Up Back Up limit swittch is tripped

To activate the QuickChair function...

Press & release the QuickChair button.

Note: In the event of a malfunction, press the Stop button.

Stop

QuickChair

Models:

Serial Numbers:

Stop

647

all

[Revised: dd/mo/yr]

QuickChair

A-27© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 34

Chair Receptacles

BR / WH

No power at chair receptacles ...........A-9No power at chair receptacles ...........A-9

This illustration shows only the components that affect the chair receptacles.

Adetaileddescriptionofcurrentowalsoappearsbelow.

Power Inlet

GN / YL

[Only the wires that affect this function are shown]

GN/ YL

BL / WH

Isolation Transformer

GN/ YL

BL / WH

Facility Supply Voltage

With the power cord properly connected, facility supply voltage (115 VAC) is supplied to the power inlet.

Power Inlet

Currentowsthrutwofusesinthepowerinlet,totheisolation

transformer.

Isolation Transformer

Note

The isolation transformer separates the receptacles from the rest of the table’s electrical system. This transformer is protected from overload by a thermal cutout feature. It will automatically reset when the transformer cools.

The isolation transformer provides 115 VAC to each of the table receptacles.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-28© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 35

Rotational Base Brake System

Base rotation will not lock ..................A-8

Base wobbles when locked ...............A-8

Grinding noise as base rotates ..........A-8

Base rotation will not unlock ..............A-8

Base rotation will not lock ..................A-8

Base wobbles when locked ...............A-8

Grinding noise as base rotates ..........A-8

Base rotation will not unlock ..............A-8

This illustration shows only the components that affect the Rotational Base Brake System.

Adetaileddescriptionofcurrentowalsoappearsbelow.

Brake Lever

Electro-magnet

Brake Springs (2)

Brake Pad

Assembly

Brake Disk

MA767400i

Base Rotation UNLOCKED

The rotational base PC board supplies 31-36 VAC to the two normally closed brake switches. When either brake pedal is pressed

&released,thecorrespondingbrakeswitchopens.Whentheopen

switch is detected, the PC board supplies approx. 15-20 VAC to the electro-magnet thru the F1 fuse.

When voltage is applied to the electro-magnet, the magnet’s pull overpowers the brake springs. This removes pressure from the brake pad assembly allowing the brake disk to rotate.

To lock base rotation:

Press&releaseeitherbrakepedal.

[Note: Base automatically locks after two minutes]

Base Rotation LOCKED

The two brake springs press upward on the brake lever. This pivots the brake lever so that pressure is applied to the brake pad assembly. This prevents the brake disk from rotating.

To unlock base rotation:

Press&releaseeitherbrakepedal.

COMNCNO

Fuse (F1)

COMNCNO

Rotational

J12

Base

J10

PC Board

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

A-29© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 36

Foot Extension

Foot extension will not

lock in place / release ......................A-9

Foot extension will not

lock in place / release ......................A-9

This illustration highlights the main components of the foot extension mechanism.

Torsion Spring

Slotted Plate

Locking Device

Locking Mechanism

When either foot extension lever is pressed, the associated linkage retracts the two locking devices. When the “teeth” on the locking devices disengage the slotted plates, the foot extension can be extended / retracted as desired.

When the foot extension levers are released, the torsion springs cause the locking devices to engage the slotted plates, locking the foot extension in place.

Foot Extension

“Crash” Limit Switch

Foot Extension “Crash” Limit Switch

The foot extension “crash” limit switch disables the Base Down and Tilt Down functions when it is tripped. The switch is tripped when pressure is applied to the bottom of the foot extension due to contact with an object.

Foot Extension Levers

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

MA7909i

The limit switch does not affect the mechanical function of the foot extension.

A-30© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 37

Section BSection B

Testing &

Primary Fuses ...................................B-2

Foot Control / Touch Pads ................. B-3

Base Actuator / Limit Switches ..........B-7

Back Actuator / Limit Switches ........B-12

Tilt Actuator / Limit Switch ...............B-16

Gas Springs .....................................B-20

Chair Receptacles

(Isolation Transformer) ..................B-21

Main System Transformer ...............B-22

Position Sensors..............................B-24

Main PC Board ................................B-30

Foot Extension /

“Crash” Limit Switch ......................B-33

Rotational Base Brake System ........B-35

Primary Fuses ...................................B-2

Foot Control / Touch Pads ................. B-3

Base Actuator / Limit Switches ..........B-7

Back Actuator / Limit Switches ........B-12

Tilt Actuator / Limit Switch ...............B-16

Gas Springs .....................................B-20

Chair Receptacles

(Isolation Transformer) ..................B-21

Main System Transformer ...............B-22

Position Sensors..............................B-24

Main PC Board ................................B-30

Foot Extension /

“Crash” Limit Switch ......................B-33

Rotational Base Brake System ........B-35

Adjustments

B-1© Midmark Corporation 2008 SF-1925 [Revised: dd/mo/yr]

Page 38

Primary Fuses

Wiring Diagrams ................................D-1Wiring Diagrams ................................D-1

Replacement

Equipment Alert

When replacing fuses, rotate fuse holder so that the correct voltage setting (115 VAC) appears in the window. Failure to comply will result in damage to the table.

115V

Models:

Serial Numbers:

647

all

[Revised: 11/13/17]

Power Indicator Light

If power indicator light is...

OFF: No power to the table (check fuses). ON: Table has power (fuses - OK)

B-2© Midmark Corporation 2008 SF-1925 Always verify model & serial number

MA7851i

Page 39

Foot Control / Touch Pads

Wiring Diagrams ................................D-1Wiring Diagrams ................................D-1

Isolating a Malfunction

To isolate a malfunction, try activating the inoperable function(s) from each touch pad and the foot control.

If function(s) are inoperable from the foot control...

A) Secure the foot control cord connection at the cord inlet. B) Secure inlet harness connection to main PC board (J10).

If function(s) still inoperable: C) Perform the Foot Control / Touch Pad Test.

Note

The foot control cord connector is “keyed” and must be oriented properly to connect. Tighten locking ring to secure connection.

If function(s) are inoperable from one touch pad...

A) Secure connection from inoperable touch pad to touch pad harness.

If function(s) still inoperable: B) Perform the Foot Control / Touch Pad Test.

If function(s) are inoperable from both touch pads...

A) Secure connections from touch pads to touch pad harness. B) Secure connection from touch pad harness to extension harness. C) Secure extension harness connection to PC board (J9).

If function(s) still inoperable: D) Perform the Foot Control / Touch Pad Test.

Models:

Serial Numbers:

647

all

Locking Ring

MA720301i

[Revised: dd/mo/yr]

B-3© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 40

Foot Control / Touch Pads - continued

Foot Control / Touch Pad Test

Step 2: Unplug table (to reset PC board). Plug table back in.

O N

1 2

MODE SELECT

J12

MA653000i

Step 1: Move both switches on the Mode Select block to ON.

Step 3: Oneatatime,press&holdeach button on the foot control / touch pad.

Do you hear “beeps” each time a button is pressed? If YES, that button is functioning properly. If NO, perform the appropriate Control Cord Test.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

B-4© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 41

Foot Control / Touch Pads - continued

Foot Control Cord Test

Foot Control Cord

Step 1: Disconnect foot control cord.

Foot Control Cord

1 2 3 4 5 6 7 8 9

Meter Reading Required Action

All pin(s)

less than 100 ohms

Any pin(s)

Cord - OK. Replace foot control touch pad.

Replace damaged cord

10 131211 14 15 16 17 18

Step 2: Place meter probe on pin #1 of round connector. Place other meter probe on pin #1 of flat connector. Check meter reading. Repeat for remaining pins.

Inlet Harness

Step 1: Disconnect inlet harness from J10 on main PC board.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Foot Control

Inlet Harness

MA7878i

B-5© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 42

Foot Control / Touch Pads - continued

Touch Pad Harness / Extension Harness Test

To RH Touch Pad

Touch Pad Harness

Step 1: Disconnect wire harness from touch pads and extension harness.

Note: The connection to the extension harness is located under the seat section.

To LH Touch Pad

Step 2: Place one meter probe on any wire color at harness connector. Place other meter probe on the corresponding wire color at the opposite connector. Check meter reading. Repeat for each wire color.

Touch Pad

Harness

Meter Reading Required Action

All pin(s)

less than 100 ohms

Any pin(s)

To Extension Harness

(connection located under the seat)

Cord - OK. Replace touch pad(s).

Replace damaged cord

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Extension Harness

Step 1: Disconnect extension harness from main PC board and touch pad harness.

Note: The connection to the touch pad harness is located under the seat section.

B-6© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Extension

Harness

To J9 on main PC board

MA7879i

Page 43

Base Actuator / Limit Switches

Limit Switch / Harness Test ...............B-8

Actuator Motor Test ...........................B-9

PC Board Test .................................B-10

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-20

Base Actuator /

Motor Replacement .......... 003-1739-00

Limit Switch / Harness Test ...............B-8

Actuator Motor Test ...........................B-9

PC Board Test .................................B-10

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-20

Base Actuator /

Motor Replacement .......... 003-1739-00

Isolating a Malfunction

This illustration shows the base limit switches and the three serviceable components of the base actuator. Use the table below to isolate the malfunction.

Problem Required Action

Motor runs, but makes grinding noise. Clean / lube actuator threads.

Replace actuator if necessary*.

Motor runs, but table does not move. Inspect / replace motor coupler*.

Motor does not run.

Perform Limit Switch / Harness Test

Actuator Motor

Ball Screw Assembly

(Lube threads w/lithium grease)

Base Limit Switches

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Motor Coupler

Down

MA768500i

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

B-7© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 44

Base Actuator / Limit Switches - continued

J12

Limit Switch / Harness Test

MA7953i

Base Down Switch

Step 2: Place one meter probe on the common (green).

Step 3: Place other probe on the wire corresponding the desired switch (see illustration).

Note: Check switch “tripped” & “untripped”.

Step 1: Disconnect harness from J13 on main PC board.

Base Up Switch

(yellow)

Common (green)

(orange)

J13

Limit Switch Continuity Test

Step 1: Disconnect wires from switch.

Step 2: Place meter probes on COM and NC terminals.

Note: Check switch “tripped” and “untripped”.

With switch “untripped”...

Meter Reading Required Action

OL Perform Limit Switch

less than 10 ohms

With switch “tripped”...

Meter Reading Required Action

less than 10 ohms Perform Limit Switch

Models:

Serial Numbers:

Continuity Test

Limit switch / harness - OK Perform Actuator Motor Test

Continuity Test

647

all

[Revised: dd/mo/yr]

With switch “untripped”...

Meter Reading Required Action

OL Replace limit switch

less than 5 ohms Limit switch - OK

Replace limit switch harness.

With switch “tripped”...

Meter Reading Required Action

OL Limit switch - OK

Replace limit switch harness.

less than 5 ohms Replace limit switch

B-8© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 45

Base Actuator / Limit Switches - continued

J12

Base Actuator /

Motor Replacement .......... 003-1739-00

Base Actuator /

Motor Replacement .......... 003-1739-00

Actuator Motor Test

Step 1: Tag and disconnect base actuator wires (J1 & J2).

Motor Ground Test

Step 2: Place meter probes on actuator wires. Check meter reading.

Meter Reading Required Action

1 to 10 ohms Actuator motor - OK

Perform Motor Ground Test

OL -or-

less than 1 ohm

Replace actuator motor*

MA652502i

Step 1: Place one meter probe on actuator wire (J1). Place other probe on PC board ground wire. Check meter reading. (Repeat for J2)

Meter Reading Required Action

OL -or-

more than 1 mega-ohm

less than 1 ohm Replace actuator motor*

Motor harness - OK Perform PC Board Test

Models:

Serial Numbers:

647

all

[Revised: 4/16/15]

* Replacement instructions are provided with the

B-9© Midmark Corporation 2008 SF-1925 Always verify model & serial number

part. They are also available on midmark.com,

or by clicking on the blue link.

Page 46

Base Actuator / Limit Switches - continued

MA768700i

J12

PC Board Replacement ...... 003-1490-00PC Board Replacement ...... 003-1490-00

PC Board Test

Step 1: Move BACK section so that it is approx. halfway

 betweenitsmaximum&minimumpositions.

Back Section Min. Position

Step 3: Tag, then disconnect base

 actuatorwiresfromJ1&J2.

Step 4: Move wire from J3 to J1. Move wire from J4 to J2.

Back Section Max. Position

Base

Max. Position

(Up limit switch is tripped)

ATTENTION: This test cannot be performed if either base limit switch is tripped.

Step 3: If necessary, remove base limit switch bracket. Switch wires must remain connected.

Base

Min. Position

(Down limit switch is tripped)

Base Limit Switch Bracket

MA768700i

Equipment Alert

The back limit switches will not stop movement during this test. Do not run past max / min positions.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Step 5: Press&holdBaseUpbuttonfor5seconds.

Does back sectionmoveupbriefly,thenstop&‘beep’? If YES, go to Step 6. If NO, replace PC board*.

Step 6: Press&holdBaseDownbuttonfor5seconds.

Does back section move down briefly, then stop & ‘beep’? If YES, PC board is OK. If NO, replace PC board*.

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

B-10© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 47

MA768700i

J12

Base Actuator / Limit Switches - continued

PC Board Replacement ...... 003-1490-00PC Board Replacement ...... 003-1490-00

PC Board Test

Step 1: Move BACK section so that it is approx. halfway

 betweenitsmaximum&minimumpositions.

Back Section Min. Position

Step 3: Tag, then disconnect base

 actuatorwiresfromJ1&J2.

Step 4: Move wire from J3 to J1. Move wire from J4 to J2.

Back Section Max. Position

ATTENTION: This test cannot be performed

Base

Max. Position

(Up limit switch is tripped)

if either base limit switch is tripped.

Step 3: If necessary, remove base limit switch bracket. Switch wires must remain connected.

Base

Min. Position

(Down limit switch is tripped)

Base Limit Switch Bracket

MA768700i

Equipment Alert

The back limit switches will not stop movement during this test. Do not run past max / min positions.

Step 5: Press&holdBaseUpbuttonfor5seconds.

Does back section move up briefly, then stop & ‘beep’? If YES, go to Step 6. If NO, replace PC board*.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Step 6: Press&holdBaseDownbuttonfor5seconds.

Does back section move down briefly, then stop & ‘beep’? If YES, PC board is OK. If NO, replace PC board*.

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

B-11© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 48

Back Actuator / Limit Switches

Limit Switch / PCB Harness Test ..... B-13

Actuator Motor Test .........................B-15

PC Board Test .................................B-16

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-21

Back Actuator /

Motor Replacement .......... 003-1738-00

Limit Switch / PCB Harness Test ..... B-13

Actuator Motor Test .........................B-15

PC Board Test .................................B-16

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-21

Back Actuator /

Motor Replacement .......... 003-1738-00

Isolating a Malfunction

This illustration shows the back limit switches and the three serviceable components of the back actuator. Use the table below to isolate the malfunction.

Problem Required Action

Motor runs, but makes grinding noise. Clean / lube actuator threads.

Replace actuator if necessary*.

Motor runs, but table does not move. Inspect / replace motor coupler*.

Motor does not run.

Equipment Alert

Do not adjust the individual switches! The limit switches & bracket must be

replaced as a complete assembly.

Perform Limit Switch / PCB Harness Test

Back Limit Switches

Ball Screw Assembly

(Lube threads w/lithium grease)

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Actuator Motor

Motor Coupler

MA769100i

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

B-12© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 49

Back Actuator / Limit Switches - continued

J12

Limit Switch / PC Board Harness Test

Step 1: Disconnect harness from J11 on main PC board.

Step 2: Place one meter probe on the common (white).

MA7954i

Back Down switch “tripped”... - ORBack Up switch “untripped”...

Meter Reading Required Action

less than 10 ohms

Limit switch / harness - OK Perform Actuator Motor Test

Perform Limit Switch Harness Test

Back Down switch “untripped”... - ORBack Up switch “tripped”...

Meter Reading Required Action

less than 10 ohms

Perform Limit Switch Harness Test

Limit switch / harness - OK Perform Actuator Motor Test

Back Up Switch (blue)

Back Down Switch (brown)

Common (white)

Step 3: Place other probe on the wire corresponding the desired switch (see illustration).

Note: Check switch “tripped” & “untripped”.

J11

Models:

Serial Numbers:

647

all

[Revised: 7/27/11]

B-13© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 50

Back Actuator / Limit Switches - continued

Limit Switch Harness Test

Step 1: Unplug the appropriate limit switch harness.

Actuator Full Up

Actuator Full Down

Actuator Midway Point

Models:

Serial Numbers:

Step 2: Measure continuity.

Meter reading should be...

White to Black - Open White to Red - Closed

White to Black - Closed White to Red - Open

White to Black - Closed White to Red - Closed

647

all

[Revised: 7/27/11]

B-14© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 51

Back Actuator / Limit Switches - continued

MA652601i

MA652600i

J12

MA652601i

MA652600i

J12

Back Actuator /

Motor Replacement .......... 003-1738-00

Back Actuator /

Motor Replacement .......... 003-1738-00

Actuator Motor Test

Step 1: Tag and disconnect back actuator wires (J3 & J4).

Motor Ground Test

Step 2: Place meter probes on actuator wires. Check meter reading.

Meter Reading Required Action

1 to 10 ohms Actuator motor - OK

Perform Motor Ground Test

OL -or-

less than 1 ohms

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Replace actuator motor*

MA652602i

Step 1: Place one meter probe on actuator wire (J3). Place other probe on PC board ground wire. Check meter reading. (Repeat for J4)

Meter Reading Required Action

OL -or-

more than 1 mega-ohm

less than 1 ohm Replace actuator motor*

* Replacement instructions are provided with the

part. They are also available on midmark.com,

Motor harness - OK Perform PC Board Test

or by clicking on the blue link.

B-15© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 52

Back Actuator / Limit Switches - continued

MA655400i

J12

PC Board Replacement ...... 003-1490-00PC Board Replacement ...... 003-1490-00

PC Board Test

ATTENTION: This test cannot be performed with the back section in the max. or min position.

Step 1: If necessary, reposition the back section.

Step 3: Tag, then disconnect back

 actuatorwiresfromJ3&J4.

Back Section Max. Position

Back Section Min. Position

Step 4: Move wire from J1 to J3. Move wire from J2 to J4.

Base

Max. Position

(Up limit switch is tripped)

Step 2: Move BASE function so that it is approx. halfway between its

 maximum&minimumpositions.

Base

Min. Position

(Down limit switch is tripped)

Equipment Alert

The base limit switches will not stop movement during this test. Do not run past max / min positions.

Step 5: Press&holdBackUpbuttonfor5seconds.

Does the base move up, then stop & ‘beep’? If YES, go to Step 6. If NO, replace PC board*.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

MA769200i

Step 6: Press&holdBackDownbuttonfor5seconds.

Does the base move down, then stop & ‘beep’? If YES, PC board is OK. If NO, replace PC board*.

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

B-16© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 53

Tilt Actuator / Limit Switch

Limit Switch Test ..............................B-18

Actuator Motor Test .........................B-20

PC Board Test .................................B-21

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-19

Tilt Actuator /

Motor Replacement .......... 003-1915-00

Limit Switch Test ..............................B-18

Actuator Motor Test .........................B-20

PC Board Test .................................B-21

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-19

Tilt Actuator /

Motor Replacement .......... 003-1915-00

Isolating a Malfunction

This illustration shows the tilt down limit switch and the three serviceable components of the tilt actuator. Use the table below to isolate the malfunction.

Problem Required Action

Motor runs, but makes grinding noise. Clean / lube actuator threads.

Replace actuator if necessary*.

Motor runs, but table does not move. Inspect / replace motor coupler*.

Motor does not run.

(UP only) Perform Output Voltage Test (at Tilt Sensor) (Down only) Perform Limit Switch Test (Up & Down) Perform Actuator Motor Test

Screw Assembly

(Lube threads w/lithium grease)

(There is only one limit switch for the Tilt function.

The upper limit is controlled by the Tilt position sensor)

Tilt Down

Models:

Serial Numbers:

Limit Switch

647

all

[Revised: 1/9/09]

Motor Coupler

Actuator Motor

* Replacement instructions are provided with the

part. They are also available on midmark.com,

MA769700i

or by clicking on the blue link.

B-17© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 54

J12

Tilt Actuator / Limit Switch - continued

Limit Switch / PC Board Harness Test

Step 1: Disconnect harness from J11 on main PC board.

Step 2: Place one meter probe on the common (white).

Tilt Down Switch (red)

With switch “untripped”...

less than 10 ohms

With switch “tripped”...

Models:

Serial Numbers:

Step 3: Place other probe on the Tilt Down limit switch (red).

Note: Check switch “tripped” & “untripped”.

Meter Reading Required Action

less than 10 ohms

Perform Limit Switch Harness Test

Limit switch / harness - OK Perform Actuator Motor Test

Perform Limit Switch Harness Test

647

all

Common (white)

J11

MA7955i

[Revised: 7/27/11]

B-18© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 55

Tilt Actuator / Limit Switch - continued

Limit Switch Harness Test

Limit Switch Continuity Test

Step 1: Disconnect wires from switch.

Step 1: Unplug the appropriate limit switch harness.

Step 2: Measure continuity.

Meter reading should be...

Actuator Full Up

Actuator Full Down

Actuator Midway Point

White to Black - Open White to Red - Closed

White to Black - Closed White to Red - Open

White to Black - Closed White to Red - Closed

Step 2: Place meter probes on COM and NC terminals.

Note: Check switch “tripped” and “untripped”.

MA7956i

With switch “untripped”...

Meter Reading Required Action

OL Replace limit switch

less than 5 ohms Limit switch - OK

Replace limit switch harness.

With switch “tripped”...

Meter Reading Required Action

OL Limit switch - OK

Replace limit switch harness.

less than 5 ohms Replace limit switch

Models:

Serial Numbers:

647

all

[Revised: 7/27/11]

B-19© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 56

Tilt Actuator / Limit Switch - continued

MA652701i

J12

MA652701i

J12

Tilt Actuator /

Motor Replacement .......... 003-1915-00

Tilt Actuator /

Motor Replacement .......... 003-1915-00

Actuator Motor Test

Step 1: Tag and disconnect tilt actuator wires (J7 & J8).

Motor Ground Test

Step 1: Place one meter probe on actuator wire (J7). Place other probe on PC board ground wire. Check meter reading. (Repeat for J8)

Step 2: Place meter probes on actuator wires. Check meter reading.

Meter Reading Required Action

1 to 10 ohms Actuator motor - OK

Perform Motor Ground Test

OL -or-

less than 1 ohm

Models:

Serial Numbers:

647

Replace actuator motor*

all

[Revised: dd/mo/yr]

MA652702i

Meter Reading Required Action

OL -or-

more than 1 mega-ohm

less than 1 ohm Replace actuator motor*

Motor harness - OK Perform PC Board Test

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

B-20© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 57

J12

Tilt Actuator / Limit Switch - continued

PC Board Replacement ...... 003-1490-00PC Board Replacement ...... 003-1490-00

PC Board Test

Step 1: Tag, then disconnect tilt

 actuatorwiresfromJ7&J8.

Step 2: PlacemeterprobesonJ7&J8

terminals on PC board. (Meter setting: VDC)

Step 3: Activate the Tilt Up function. Check meter reading. Repeat for Tilt Down function.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Meter Reading Required Action

approx 48 VDC PC board - OK

out of range Replace PC board*

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

B-21© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 58

Gas Springs

Access Procedures............................C-1

Exploded View / Part Numbers ........E-11

Gas Spring Replacement ...003-1741-00

Access Procedures............................C-1

Exploded View / Part Numbers ........E-11

Gas Spring Replacement ...003-1741-00

Isolating a Malfunction

Problem Required Action

Squeaking, grinding sound coming from pivot joints.

Diminished lifting capacity.

(Base actuator - OK)

Clean / lube pivot joints. (lubricant: lithium grease)

Replace gas springs*.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

(Lube w/lithium grease)

Pivot Joints

MA771700i

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

B-22© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 59

Chair Receptacles (Isolation Transformer)

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-16

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-16

[Note: The isolation transformer affects the chair receptacles only].

Isolation Transformer Output Voltage Test

Step 1: Place meter probes on receptacle screws as shown. Check meter reading.

Meter Reading Required Action

120 VAC (+ 10%) Isolation transformer - OK

less than 108 VAC If table power light is ON, replace isolation

Models:

Serial Numbers:

647 (-001 & -002)

all

[Revised: dd/mo/yr]

Replace receptacle(s).

transformer. If power light is OFF, check supply voltage.

MA657700i

B-23© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 60

Main System Transformer

Reisitance Test ................................ B-23

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Standard Base ...............................E-12

Rotational Base .............................E-13

Reisitance Test ................................ B-23

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Standard Base ...............................E-12

Rotational Base .............................E-13

[Note: The main system transformer affects all table functions (except chair receptacles)].

Output Voltage Test

Step 1: Place meter probes on black and white wires of transformer connector. Check meter reading.

Step 2: Place meter probes on red and orange wires of transformer connector. Check meter reading.

Meter Reading

(black & white wires)

42 to 58 VAC Transformer - OK

out of range

Models:

Serial Numbers:

Required Action

Perform Resistance Test

647

all

[Revised: dd/mo/yr]

MA655200i

Meter Reading

(red & orange wires)

23 to 43 VAC Transformer - OK

out of range

Required Action

Perform Resistance Test

B-24© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 61

Main System Transformer - continued

Resistance Test

MA657500i

Step 1: Unplug table power cord.

Step 2: Tag and disconnect four

transformer wires from inlet.

Wires:

Blue

Blue/White

Brown

Brown/White

Step 4: Place meter probes on blue and brown wires. Check meter reading.

Blue

Brown

Meter Reading Required Action

less than 10 ohms Transformer - OK

OL -or-

more than 10 ohms

Models:

Serial Numbers:

Replace transformer.

647

all

[Revised: dd/mo/yr]

Step 3: Place meter probes on blue/white and brown/white wires. Check meter reading.

B-25© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Blue / White

Brown / White

Page 62

Position Sensors

Output Voltage Test (at Sensor) ......B-25

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-18

Position Sensor

Replacement ....................003-1473-00

Output Voltage Test (at Sensor) ......B-25

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Exploded View / Part Numbers ........E-18

Position Sensor

Replacement ....................003-1473-00

Testing

Location

Step 1: Verify position sensor shoulder bolts are tight (50 ft-lbs).

Note: This step does not apply to the Base sensor.

Step 2: Perform Output Voltage Test (at Sensor).

Note: This test must always be performed first. The results of this test determine the next required action.

Back Sensor

Affected Functions: Back UP / DOWN Crash Avoidance System Position Programming

Tilt Sensor

Affected Functions: Tilt UP / DOWN Crash Avoidance System Position Programming

Models:

Serial Numbers:

647

all

[Revised: 1/27/10]

Back Sensor

Tilt Sensor

Base Sensor

MA7910i

Base Sensor

Affected Functions: Base UP / DOWN Crash Avoidance System Position Programming

B-26© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 63

Position Sensors - continued

Output Voltage Test (at Sensor)

Note: If Tilt is stuck in Down position...

Disconnect the White and Black wires at J7 & J8 on Main PC Board. Connect Black wire to J7 and White wire to J8. Perform Output Voltage Test on the Tilt Up function by pressing the Tilt DOWN button.

Caution: Do not run Tilt Up function beyond the halfway position.

Reconnect White wire to J7 and Black wire to J8. Perform Output Voltage Test on the Tilt Down function.

Step 1: Set meter to VDC.

Step 2: Place meter probes on proper terminals.

(See appropriate illustration)

Step 3: Rundesiredfunctionup&down. Watch meter reading as function moves.

Voltage steadily increases / decreases

Voltage doesn’t change, or changes erratically

Base Sensor

Wires:

Black

Brown

Red

Wires:

Yellow

Tilt Sensor

Brown Violet

Meter Reading Required Action

Perform Output Voltage Test

as function moves up / down

(at PC Board)

Perform Supply Voltage Test

moves up / down

(at Sensor)

Back Sensor

Wires:

Grey

Violet

Yellow

Models:

Serial Numbers:

647

all

[Revised: 4/3/09]

B-27© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 64

Position Sensors - continued

J11

J12

PC Board Replacement ...... 003-1490-00PC Board Replacement ...... 003-1490-00

Output Voltage Test (at PC Board)

Step 1: Set meter to VDC.

MA7853i

Probe position for:

Base Sensor

Step 2: Place meter probes on proper wires. (See appropriate illustration)

Step 3: Rundesiredfunctionup&down. Watch meter reading as function moves.

Note: Each sensor has a different voltage range. The important thing to watch for is whether the voltage changes as the functions moves.

Voltage steadily increases / decreases

Voltage doesn’t change, or changes erratically

Probe position for:

Back Sensor

Brown

Black

J12

J13

Meter Reading Required Action

as function moves up / down

Probe position for:

Tilt Sensor

Replace PC board*

(see NOTE)

PC board - OK Inspect wire harness connections.

Yellow

Grey

Yellow

J11

Yellow / White

Models:

Serial Numbers:

647

all

[Revised: 12/19/08]

Note

Before replacing PC board, be sure shoulder bolt at the sensor pivot point is tight. If

bolt is loose, tighten it, then recalibrate PC board & check for proper operation.

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

B-28© Midmark Corporation 2008 SF-1925 Always verify model & serial number

Page 65

Position Sensors - continued

Position Sensor

Replacement ....................003-1473-00

Position Sensor

Replacement ....................003-1473-00

Supply Voltage Test (at Sensor)

Step 1: Set meter to VDC.

Step 2: Place meter probes on proper terminals.

(See appropriate illustration) Check meter reading.

Wires:

Black

Brown

Red

Base Sensor

Back Sensor

Meter Reading Required Action

2 to 4 VDC

less than 2 VDC

more than 4 VDC

Reading changes erratically as

Base moves up / down

Models:

Serial Numbers:

647

all

[Revised: 6/23/10]

Step 3: With meter probes in the same position,

run Base function to max. / min. position. Check reading as function moves.

Perform Position Sensor Adjustment. Replace position sensor if necessary*.

Perform Supply Voltage Test

(at PC Board)

Wires:

Grey

Violet

Yellow

Tilt Sensor

Wires:

Yellow Brown Violet

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

Page 66

J12

J11

Position Sensors - continued

PC Board Replacement ...... 003-1490-00PC Board Replacement ...... 003-1490-00

Supply Voltage Test (at PC Board)

Step 1: Set meter to VDC.

MA654700i

* Attention (Back / Tilt only)

If initial reading is less than 2 VDC or more than 4 VDC, unplug J11 connector & check meter reading at pins on PC board (same location).

If reading is: 2 to 4 VDC Replace sensor wire harness <2 VDC Replace PC board >4 VDC Replace PC board

Meter Reading Required Action

2 to 4 VDC Replace wire harness between:

less than 2 VDC

more than 4 VDC

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Step 2: Place meter probes on proper wires. (See appropriate illustration)

[sensor & junction board] - or [junction board & PC board]

Replace PC board*.

Probe position for:

Base Sensor

J13

Probe position for:

Back Sensor*

Tilt Sensor*

Red

Black

J12

Purple

Yellow

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

Page 67

J11

J12

Position Sensors - continued

Installation / Adjustment

Step 2: Position table function as indicated in the chart. Turn sensor knob until voltage reading is in the indicated range.

Step 1: Remove main PC board cover. Place meter probes as shown to test desired sensor.

Probe position for:

Sensor Function Position Voltage Reading

BASE all the way UP 1.7 to 2.1 VDC

BACK all the way UP 2.4 to 2.6 VDC

TILT all the way DOWN 1.8 to 2.1 VDC

BASE SENSOR

Probe position for:

BACK SENSOR

Black

Brown*

J12

s/n V2200 thru V921393

Grey

Yellow

J11

Probe position for:

TILT SENSOR

Yellow / White

Yellow

Models:

Serial Numbers:

MA656800i

647

all

[Revised: 2/18/16]

*Alternate wire color:

J13

Blue

ATTENTION!

If position sensor wiring is disconnected you must recalibrate the PC board. Failure to do so will cause the table to malfunction.

Step 3: Perform PC Board Calibration Procedure. [Refer to: Section B - Main PC Board]

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

Page 68

Main PC Board

Calibration Procedure ......................B-32

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Standard Base ...............................E-12

Rotational Base .............................E-13

Calibration Procedure ......................B-32

Access Procedures............................C-1

Wiring Diagrams ................................D-1

Standard Base ...............................E-12

Rotational Base .............................E-13

Error Codes

If the PC board detects a malfunction in the electrical system, the two error code LEDs onthePCboardwillashinaspecicsequencetoidentifythecauseoftheproblem.

How to Display an Error Code

If you suspect a problem with a specific function...

A) Remove PC board cover, then locate error code LEDs. B) Activate desired function from foot control or touch pad.

If an electrical malfunction is detected:

• Function will stop moving

• You will hear a “beep”

• Error code LEDs will flash error code sequence

How to Recall Last Five Error Codes

O N

To recall the last five error codes...

A) Move both MODE SELECT switches to ON (up). B) Unplug table (to reset PC board), then plug back in. C) Press and release S2 button. (To repeat error codes, press S2 button again) (To erase all error codes from memory, press & hold S2 button until you hear three “beeps”)

If there are error codes stored in the system memory:

• Error code LEDs will flash error code sequence of the five most recent error codes. (You will hear three “beeps” between each error code)

1 2

S2 Button

Error Code

LEDs

MA657000i

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Page 69

Main PC Board - continued

Error Codes - continued

Identication

Digit 1 LED: ThisLEDidentiesthefunctionormodeduringwhichtheerrorwasdetected. (ex. Base / Back / Tilt, Programming Mode, Calibration Mode) RecordthenumberoftimesthisLEDashesbeforeDigit2LEDbeginstoash.

Digit 2 LED: ThisLEDidentiesthecauseoftheerror.(ex. motor overload, incorrect button pressed, etc) RecordthenumberoftimesthisLEDashesbeforeDigit1LEDashesagain.

Locate the two digit error code in the charts below:

Digit 1 LED

Digit 2

LED

DIGIT 1

DIGIT 2

(# of ashes)

Digit 1 LED

1 BASE 1

2 BACK 2

3 TILT

(# of ashes)

Digit 1 LED Mode

7 Programming

Table

Function

Mode

(# of ashes)

Digit 2 LED Cause of the Error

Table in potential “crash position”

Actuator motor run time exceeded max. limit

5 Actuator motor overload

6 Function failed during calibration

(# of ashes)

Digit 2 LED Cause of the Error

Position sensor did not move when function was activated

Position sensor reading is out of acceptable range

Position button (1, 2, 3) not pressed within 5 seconds

Incorrect button pressed while in Programming Mode

Position cannot be programmed (potential “crash” position)

(# of ashes)

Digit 1 LED Mode

8 Calibration

Mode

Error Recall

Mode

(# of ashes)

Digit 1 LED Mode

9 Software

System

(# of ashes)

Digit 2 LED Cause of the Error

1 Calibration was not successful

(# of ashes)

Digit 2 LED Cause of the Error

1 Software malfunction

4 Foot extension switch is tripped

9 Disregard this error

Incorrect button pressed while in Calibration Mode

Incorrect button pressed while in Error Recall Mode

(need to recalibrate PC board)

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Page 70

Main PC Board - continued

Calibration Procedure

During the calibration procedure, the PC board records the voltage readings from the position sensors as the base, back, and foot actuators move to their maximum, then minimum positions. Note: The tilt actuator will only move momentarily as it clears the tilt down limit switch and then returns to the minimum position. You will hear a steady pattern of “beeps” as the table moves during calibration. When successful calibration is complete, the table will stop moving and you will hear three “beeps”.

You must calibrate the PC board in the following situations:

 • After disconnecting / replacing the PC board  • After disconnecting / replacing any of the position sensors

Equipment Alert

On models with rotational base, remove PC board

cover before performing the calibration procedure.

Step 4: Wait five seconds, then press S2 button.

S2 Button

J12

Step 1: Move the foot section to the stowed position.

Step 2: Move MODE SELECT switches: Switch 1 - ON (up) Switch 2 - OFF (down)

Step 3: Unplug table (to reset PC board), then plug table back in.

Models:

Serial Numbers:

647

all

[Revised: 04/19/10]

O N

1 2

MODE SELECT

MA657300i

To return to normal operation...

A) Move MODE SELECT block switches back to original position B) Unplug table (to reset PC board) C) Plug table back in.

Page 71

Foot Extension / “Crash” Limit Switch

“Crash” Limit Switch Test .................B-34

Foot Extension.................................E-7

Foot Extension Housing ..................E-8

“Crash” Limit Switch Test .................B-34

Foot Extension.................................E-7

Foot Extension Housing ..................E-8

Locking Mechanism Inspection

Step 1: Remove foot extension upholstery and substrate (not shown).

Step 2: Press foot extension lever(s). Extend / retract foot extension.

[Linkage should retract two locking devices, disengaging the “teeth” from the slotted plates. This should allow foot extension to slide in / out].

Slotted Plate

Torsion Spring

Foot Extension Levers

Locking Device

Step 3: Release foot extension lever(s).

[The torsion springs should pull the two locking devices into the locked position. The “teeth” should engage the slotted plates, locking the foot extension in position.]

MA7909i

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Page 72

Foot Extension / “Crash” Limit Switch - continued

J12

”Crash” Limit Switch / Harness Test

Step 1: Disconnect harness from J11 on main PC board.

Step 2: Place one meter probe on the common (white).

MA7957i

“Crash” Limit Switch

Common (white)

Step 3: Place other probe on the “Crash” limit switch wire (black / white).

(black / white)

Limit Switch Continuity Test

Step 1: Tag and disconnect switch wires.

Note: Check switch “tripped” & “untripped”.

With switch “untripped”...

Meter Reading Required Action

OL Perform Limit Switch

Continuity Test

less than 10 ohms Limit switch / harness - OK

Test inoperable function(s).

With switch “tripped”...

Meter Reading Required Action

OL Limit switch / harness - OK

Test inoperable function(s).

less than 10 ohms Perform Limit Switch

Models:

Serial Numbers:

Continuity Test

647

all

J11

Step 2: Place meter probes on COM and NC terminals.

Note: Check switch ‘tripped’ and ‘untripped’.

With switch ‘untripped’...

Meter Reading Required Action

OL Replace limit switch.

less than 5 Ω Limit switch - OK

With switch ‘tripped’...

Meter Reading Required Action

OL Limit switch - OK

less than 5 Ω Replace limit switch.

MA7911i

[Revised: dd/mo/yr]

Page 73

Rotational Base Brake System

Magnet Position Adjustment ............ B-36

Rot. Brake Electrical Test /

Fuse Location ................................B-37

Electro-magnet Test ........................B-38

EMI Filter Board Test ....................... B-39

Brake Pedal Switch Access .............B-40

Separating Upper & Lower

Base Castings ...............................B-41

Brake Lever &

Electro-magnet Access ..................B-46

Foot Control Inlet / Power Inlet /

EMI Filter Board Access ................B-47

Wiring Diagrams ................................D-1

Upper Section ................................E-13

Lower Section ................................E-14

Brake Lever / Electro-magnet ........E-15

Magnet Position Adjustment ............ B-36

Rot. Brake Electrical Test /

Fuse Location ................................B-37

Electro-magnet Test ........................B-38

EMI Filter Board Test ....................... B-39

Brake Pedal Switch Access .............B-40

Separating Upper & Lower

Base Castings ...............................B-41

Brake Lever &

Electro-magnet Access ..................B-46

Foot Control Inlet / Power Inlet /

EMI Filter Board Access ................B-47

Wiring Diagrams ................................D-1

Upper Section ................................E-13

Lower Section ................................E-14

Brake Lever / Electro-magnet ........E-15

Isolating a Malfunction

Problem Required Action

Brake will not lock.

Base wobbles when locked. - and / or - Grinding noise when base rotates.

Brake will not unlock.

Screwdriver Test

Step 1: Remove brake lever cover. Hold a screwdriver on brake lever.

Models:

647 (-003 & -004)

Brake Lever

Unplug table power cord. Does the brake lock?

If YES, perform Rot. Brake Electrical Test.

If NO, inspect the mechanical brake components. (Refer to: Brake Lever / Electro-magnet Access)

Without separating the castings, remove any debris

betweenupper&lowercastings.

Inspectneedlebearing&brakediskfordamage.

Tighten hub screws. (Refer to: Separating Upper & Lower Base Castings)

If one pedal works: Check faulty brake pedal switch. (Refer to: Brake Pedal Switch Access)

If neither brake pedal works: Perform Screwdriver Test.

Step 2: Press&releasethebrakepedal.

Can you feel the electro-magnet energize? If YES: Perform Magnet Position Adjustment.

If NO: Check rotational base PC board fuse. Perform Rotational Brake Electrical Test

Brake Pedal

MA7856i

Serial Numbers:

all

[Revised: dd/mo/yr]

Page 74

Rotational Base Brake System - continued

Magnet Position Adjustment

If the rotational brake will not unlock, the electro-magnet may be out of adjustment.

Step 1: Rotate the base to access the brake lever cover. Remove brake lever cover.

Note: If the brake will not release, the base can still be rotated manually by applying additional force.

The brake lever cover is located between the upper & lower base castings at the patient’s left rear corner.

Brake Lever Cover

Step 2: Press the brake pedal while watching the brake lever.

If the magnet “grabs” the brake lever... Tighten the magnet screw 1/4 turn.

If the magnet does not “grab” the brake lever... Loosen the magnet screw 1/4 turn.

Check for proper operation. Repeat if necessary.

Brake Lever

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

MA713000i

Page 75

Rotational Base Brake System - continued

PC Board Replacement ...... 003-1490-00PC Board Replacement ...... 003-1490-00

Rotational Brake Electrical Test / Fuse Location

Step 1: Remove PC board cover.

Rotational Base PC Board

Step 2: Place meter probes on wires at J2 on Rotational Base PC Board.

Note: If no voltage is detected, press & release the brake pedal - then check again.

Fuse

Meter Reading Required Action

15-21 VAC

0 VAC Check Rot. Base PC Board fuse.

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

PC board is OK. Perform Electro-magnet Test

MA713100i

If fuse is OK - Replace PC board*.

* Replacement instructions are provided with the

part. They are also available on midmark.com,

or by clicking on the blue link.

Page 76

Rotational Base Brake System - continued

Electro-magnet Access ....................B-46Electro-magnet Access ....................B-46

Electro-magnet Test

Step 1: Remove PC board cover.

Rotational Base PC Board

Step 2: Disconnect magnet wire harness from J2 on Rot. Base PC Board.

Step 3: Place meter probes on wire harness.

Meter Reading Required Action

approx. 10 ohms Magnet is OK.

OL -or-

less than 5 ohms

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

Check mechanical components.

Inspect magnet wire harness. If OK, replace electro-magnet.

MA713200i

Page 77

Rotational Base Brake System - continued

Primary Fuses ...................................B-2

EMI Filter Board Access ..................B-46

Access Procedures............................C-1

Primary Fuses ...................................B-2

EMI Filter Board Access ..................B-46

Access Procedures............................C-1

EMI Filter Board Test

ThistestallowsyoutocheckforlinevoltagecomingthrutheEMIlterboard withoutseparatingtheupper&lowercastings.

Step 1: Remove PC board cover.

Rotational Base PC Board

Step 2: Place meter probes on blue wire and brown/white wire at J3 on Rotational Base PC Board.

Blue

Brown / White

Meter Reading Required Action

approx. 115 VAC EMIlterboardisOK.

0 VAC Checkprimaryfuses&wireharness.

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

Check connections to main PC board.

IffusesareOK,replaceEMIlterboard.

MA717800i

Page 78

Rotational Base Brake System - continued

Access Procedures............................C-1Access Procedures............................C-1

Brake Pedal Switch Access

Step 1: Raise base shrouds.

Step 2: Remove two screws from shroud spacer.

Step 3: Remove brake pedal.

Note: Pivot brake pedal toward column, then press down and push forward to release.

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

MA715000i

Page 79

Rotational Base Brake System - continued

Separating Upper & Lower Base Castings

Separating

Step 1: Route bungee cord across top of base column (under seat).

Note: It may be necessary to run the Tilt Up function to route bungee cord under seat section.

Separating

Step 2: Run Base Up function to its max height.

 Positiontablesothatfoot&backsections are level as shown.

Separating Step 4: Raise shrouds, then attach

bungee cord hooks under shrouds on both sides.

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

Assembly

Bungee Cord

Step 10: Remove bungee cord. Secure inner shrouds w/screws.

WARNING

Always disconnect table power cord before removing any covers or shrouds.

Separating

Step 3: Remove bottom screws from inner shrouds.

MA7857i

Procedure continued on following page...

Page 80

Rotational Base Brake System - continued

Separating Upper & Lower Base Castings - continued

Separating

Step 5: Partially separate PC board cover.

Note: Do not disconnect wire harnesses.

Assembly

Step 9: Replace PC board cover.

Separating

Step 6: Remove shroud spacer.

Assembly

Step 8: Install shroud spacer.

Assembly Step 7: Install wire harness cover.

Separating

Step 7: Remove wire harness cover.

Lower

Harness (B)

Models:

Serial Numbers:

Assembly Step 6: Replace all cable ties.

Connect ground wires for lower harness (A).

Separating

Step 8: Disconnect ground wire for lower harness (A).

 Removecabletiessecuringlowerharnesses(A&B)tobase.

647 (-003 & -004)

all

[Revised: dd/mo/yr]

Lower

Harness (A)

Procedure continued on following page...

Page 81

Rotational Base Brake System - continued

Separating Upper & Lower Base Castings - continued

Caution

The table weighs approx 500 lbs (226 kg). Use supports designed for this amount of weight.

Separating Step 9: Position sawhorses (or other suitable supports)

 underback&footsectionweldments.

WARNING

Disconnect the table power cord before performing the remaining installation steps.

Assembly

Step 5: Install four hub screws.

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

Hub Screw

The table top / upper base is not secured once the hub screws are removed. Hold onto the table when performing the following steps.

Separating

Step 10: Remove four hub screws.

MA7858i

Caution

Procedure continued on following page...

Page 82

J12

J11

Rotational Base Brake System - continued

Separating Upper & Lower Base Castings - continued

WARNING

The steps on this page require power to be connected to the table. Avoid all contact with wiring & electrical components.

Equipment Alert

To activate Base Up / Down, it may be necessary to jumper the Foot Extension “Crash” Limit Switch. Be certain to remove jumper wire when procedure is completed.

Main

PC Board

Jumper

Wire

Equipment Alert

The two lower wire harnesses are still connected to upper casting. Running the Base Down function too long may result in damage to the table.

Separating Step 11: Activate Base Down function until castings separate slightly.

Assembly

Step 4: Carefully adjust table top until alignment studs on bottom of upper casting lock into the notches on the rotation wheel.

Note: You will feel table top drop into place when alignment studs engage notches.

Upper Base Casting

(bottom view)

The table top / upper base is not secured until the hub screws are installed. Hold onto the table when performing the following steps.

Assembly

Step 3: Activate Base Up function until table raises (slightly) off of supports.

Models:

Serial Numbers:

Caution

647 (-003 & -004)

all

[Revised: 3/31/14]

Alignment

Stud

Notch

Rotation Wheel

(In Lower Base Assembly)

Procedure continued on following page...

Page 83

I/O

PORT

Rotational Base Brake System - continued

Separating Upper & Lower Base Castings - continued

Assembly

Step 2: Route wire harnesses thru upper casting. Reconnect all wire harnesses as shown.

WARNING

Disconnect table power cord before performing any of the steps on this page.

Separating Step 13: Disconnect wire harness

from J9 on main PC board.

Separating Step 12: DisconnectwireharnessfromJ2&J3

on rotational base PC board.

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

Separating Step 14: Slide lower base assembly out.

Assembly Step 1: Slide lower base assembly under table.

Note: To ease installation, align the new lower base assembly in the same position as the old base.

MA7860i

Page 84

Rotational Base Brake System - continued

Separating Upper & Lower

Base Castings ...............................B-40

Separating Upper & Lower

Base Castings ...............................B-40

Brake Lever & Electro-magnet Access

Step 1: Separateupper&lowerbasecastings.

Step 2: Removecornercover&top

cover from lower base assembly.

Brake Disk

To install electro-magnet...

A) Connect magnet wire harness. B) Install magnet.

Note: Be sure spring washer is in place under magnet.

Brake Pad

Step 3: Remove brake lever.

Brake Lever

Spring

Washer

Spring

Step 4: Disconnect magnet wire harness. Remove magnet.

MA717600i

To install brake lever...

A) Position brake lever so that it aligns w/ slots in brake pad. B) Secure lever with two screws.

Note: Be sure roll pins (in brake lever) align with springs.

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

Page 85

Rotational Base Brake System - continued

Foot Conrol Inlet / Power Inlet / EMI Filter Board Access

Step 1: Separateupper&lowerbasecastings.

Step 2: Turn lower base assembly upside down.

Remove bottom cover.

To remove EMI filter board...

A) Tag & disconnect all wires to board. B) Remove board from mounting studs.

To remove foot control inlet...

A) Unscrew lock nut. B) Remove foot control inlet / harness assembly.

Models:

Serial Numbers:

647 (-003 & -004)

all

[Revised: dd/mo/yr]

To remove power inlet...

A) Tag & disconnect all wires to power inlet. B) Pry power inlet out of bottom cover.

MA717700i

Page 86

Section CSection C

Access

Standard Base .................................C-2

Rotational Base ...............................C-3

raising (w/ bungee cord) ..................C-4

lowering / removal / installation .......C-5

Upholstery .........................................C-6

Standard Base .................................C-2

Rotational Base ...............................C-3

raising (w/ bungee cord) ..................C-4

lowering / removal / installation .......C-5

Upholstery .........................................C-6

Procedures

Page 87

PC Board Cover (models w/ Standard Base)

Removal / Installation

Caution

Unplug power cord before removing PC board cover.

Installation

Step 3: Secure cover with two screws.

Equipment Alert

You must perform Step 2 before cover can be completely removed.

Removal

Step 1: Remove two screws, then partially separate cover.

Installation Step 2: Connect wire harnesses

to J12 on PC board.

Removal Step 2: Disconnect wire harnesses

from J12 on PC board.

Models:

Serial Numbers:

Removal Step 3: Remove wire harness cover.

Installation Step 1: Install wire harnesses cover.

647 (-001 & 002)

all

[Revised: dd/mo/yr]

J12

MA7939i

Page 88

PC Board Cover (models w/ Rotational Base)

Removal / Installation

Equipment Alert

Caution

Unplug power cord before removing PC board cover.

You must perform Step 2 before cover can be completely removed.

Removal

Step 1: Remove two screws, then partially separate cover.

Removal Step 2: Remove two screws from

transformer mtg. plate.

Installation Step 3: Secure transformer mtg. plate.

Secure cover w/ two screws.

Installation Step 2: Position transformer mtg. plate

so that tab is engaged.

Removal Step 3: Pull transformer mtg. plate out to disengage tab.

Prop mtg. plate up behind two standoffs as shown.

Tab

Models:

Serial Numbers:

Removal Step 4: Disconnect wire harnesses

from J12 on PC board.

Installation Step 1: Connect wire harnesses

to J12 on PC board.

647 (-003 & -004)

all

[Revised: dd/mo/yr]

J12

MA7940i

Page 89

Base Shrouds

Raising (w/bungee cord)

Step 3: Lift shrouds, then attach bungee cord hooks under shrouds on both sides.

Step 2: Stretch bungee cord across top of base column (under seat).

Note: It may be necessary to run Tilt Up function to route bungee cord under seat section.

Bungee Cord

Step 1: Remove bottom screws from inner shrouds.

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Page 90

Base Shrouds - continued

Lowering / Removal / Installation

Lowering / Removal

Step 1: Remove magnetic cladding (3 pcs).

Installation Step 3: Install magnetic cladding.

Equipment Alert

Lower the base before performing Step 2. This will prevent the shrouds from falling when the outer shrouds are removed.

Lowering / Removal

Step 2: Remove screws from outer shrouds only. Pull shrouds outward to disengage tabs.

Installation Step 2: Position outer shrouds.

Secure with screws at both sides.

Note: Insert shroud tabs into seat weldment slots.

MA771800i

Models:

Serial Numbers:

Installation Step 1: Position inner shrouds, then secure w/ screws.

Repeat for middle shrouds.

Note: Be sure shroud tabs stack on top of each other.

647

all

[Revised: dd/mo/yr]

Equipment Alert

The middle & inner shroud sets are different sizes. Be sure to keep the sets together.

Removal

Step 3: Removescrewsfrominner&middleshrouds.

Page 91

Upholstery

Removal / Installation

Note

Upholstery is fastened with velcro. To remove, simply pull desired section away from mounting surface.

To replace chair arm uphostery...

A) Remove two screws securing bottom cover. B) Remove four screws securing upholstered pad. C) Position new upholstered pad, then secure with four screws. D) Position bottom cover, then secure with two screws

To install seat / back uphostery...

A) Raise back section of table approx. 30°. B) Position front of seat uph. against mounting board. C) Press seat section down firmly, then lay back section into position and press down firmly.

Raise back section

approximately 30°

Models:

Serial Numbers:

647

all

[Revised: 9/21/10]

MA8217i

To install foot section uphostery...

A) Position foot upholstery on mounting board. B) Press down firmly.

MA7828i

Page 92

Foot Extension Covers

Removal / Installation

Replace Touchpads

Step 1: Remove Upholstery and Substrate.

A) Remove foot extension upholstery. B) Remove four screws and foot extension substrate.

Models:

Serial Numbers:

647

all

[Revised: 2/17/09]

MA7981i

Page 93

Foot Extension Covers - continued

Removal / Installation

Release Lever

Mounting Screw

(Side Cover)

Mounting Screw

(Side Cover)

Stop Screw

Step 2: Remove Covers.

A) Loosen two stop screws and remove debris tray shelf. B) Pull out foot extension, loosen set screws and remove release levers. C) Remove six mounting screws from front cover. D) Remove six mounting screws from side cover. E) Remove front and side covers.

Mounting Screw

(Front Cover)

Models:

Serial Numbers:

647

all

[Revised: 2/17/09]

Replace Touchpads

To install covers... A) Install side cover and secure with six screws. B) Snap front cover into position and secure with six screws. C) Install release levers and tighten set screws. D) Install debris tray shelf and tighten stop screws. E) Install foot extension substrate and upholstery.

MA7982i

Page 94

Foot Extension Slides

Removal / Installation

To remove slides...

A) Remove foot extension covers. (see Foot Extension Covers) B) Cut left hand cable tie securing wire harness to the foot extension weldment. C) Using the tilt function, position chair so the foot section is in the horizontal position. D) Remove one bottom screw from each side of foot extension weldment. E) Unscrew three of the four top screws holding the foot extension weldment to the slide mounting brackets. F) Support the foot extension weldment, then unscrew the fourth screw. G) Pull up on release cable to release locking jaws, then rest foot extension weldment on foot extension housing. H) Move the inner slide in or out to access and remove three screws from each slide mounting bracket. I) From the bottom of the foot extension housing, move the inner slide in or out to access and remove three screws securing the slide assembly to the foot extension housing.

Slide Replacement

Slide

Assembly

Foot Extension

Housing

Slide Mounting

Bracket

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Foot Extension

Weldment

Release

Cable

Cable Tie

Page 95

Foot Extension Slides (continued)

Removal / Installation

Slide Replacement

To install slides...

A) Attach new slide assembly to foot extension housing, then attach slide mounting brackets. B) Pull up on release cable, position foot extension weldment in the foot extension housing. Be sure the locking jaws engage the foot lock plate. C) Tighten four top screws and two bottom screws securing the foot extension weldment to the slide brackets. D) Secure the wire harness with a nylon cable tie. E) Install foot extension covers. (see Foot Extension Covers)

Foot Extension

Weldment

Slide

Assembly

Foot Extension

Housing

Slide Mounting

Bracket

Release

Cable

Cable Tie

Models:

Serial Numbers:

647

all

[Revised: dd/mo/yr]

Page 96

Section DSection D

Wiring Diagrams

(-001 & -002) Standard Base...........D-2

(-003 & -004) Rotational Base .........D-3

(-001 & -002) Standard Base...........D-2

(-003 & -004) Rotational Base .........D-3

Page 97

Models:

Serial Numbers:

647 (-001 & -002)

all

Wiring Diagram: 647 (-001 / -002)

Item Description

(sensors & switches not included unless noted)

A Touch Pad Extension Harness 015-2375-00

B Touch Pad Harness 015-2377-00

Connection Port Harness

(long - foot end)

D Foot Extension Switch Harness 015-2311-00

E Tilt Down Limit Switch Harness 015-2107-00

Back Limit Switch Assembly

(incl. harness & two switches)

Tilt&BackPositionSensorHarness

(incl. both sensors)

Base Position Sensor / Limit Switch

Harness

I Power Light Harness (incl. green light) 015-1793-00

J ‘PCBoardtoJunctionBoard’Harness 015-1937-00

LH Touch Pad: Non-Programmable 015-2355-00

Programmable 015-2356-00

RH Touch Pad: Non-Programmable

Programmable 015-2356-01

Part

Number

002-1110-01

015-2097-00

015-1761-00

015-1821-00

015-2355-01

[Revised: 08/02/2010]

Page 98

Models:

Serial Numbers:

647 (-003 & -004 )

all

Wiring Diagram: 647 (-003 / -004)

Item Description

(sensors & switches not included unless noted)

A Touch Pad Extension Harness 015-2375-00

B Touch Pad Harness 015-2377-00

C Connection Port Harness 002-1110-03

D Foot Extension Switch Harness 015-2311-00

E Tilt Down Limit Switch Harness 015-2107-00

Back Limit Switch Assembly

(incl. harness & two switches)

Tilt&BackPositionSensorHarness

(incl. both sensors)

Base Position Sensor / Limit Switch

Harness

I Power Light Harness (incl. green light) 015-1793-00

J ‘PCBoardtoJunctionBoard’Harness 015-1937-00

Rot. Base PC Board to Power Inlet

Harness

Rot. Base PC Board to Main PC Board

Harness

M Brake Pedal Switch Harness 015-1967-00

LH Touch Pad: Non-Programmable 015-2355-00

Programmable 015-2356-00

RH Touch Pad: Non-Programmable 015-2355-01

Programmable 015-2356-01

Part

Number

015-2097-00

015-1761-00

015-1821-00

015-1966-00

015-1968-00

[Revised: 08-02-2010]

Page 99

Models:

Serial Numbers:

[Revised: dd/mo/yr]

Page 100

Section ESection E

Exploded Views &

(-001 & -002) Standard Base...........D-2

(-003 & -004) Rotational Base .........D-3

(-001 & -002) Standard Base...........D-2

(-003 & -004) Rotational Base .........D-3

Parts Lists

XXX-XXXX-XX

Midmark 647 Service And Parts Manual

Specifications and Main Features

Frequently Asked Questions

User Manual