Midmark 222, 223, 622, 623 Service manual

®

Go To Table Of Contents

Style B

Barrier-Free Examination Table

Model Numbers:

222 223 622 623

-001 thru -017

-001 thru -016

-001 thru -008

-001 thru -010

Service and

Parts Manual

SF-1822 Part No. 004-0363-00 Rev. F (12/18/12)

FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

GENERAL INFORMATION

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

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

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

Specifications ........................... iv

Range of Motion ............................ iv

Model Identification / Compliance Charts:

222 ................................................

223 ................................................

622 / 623 .......................................

General Information

Scheduled Maintenance ............ viii

Warranty Information................. ix

OPERATION & TROUBLESHOOTING

Attention!

If table has no power, refer to Base Up / Down

Function to troubleshoot

Section A

Base Up / Down Function........ A-2

Back Up / Down Function:

Manual (222 / 622) ........................

Power (223 / 623) ..........................

Optional Features

Drawer Heater System ............. A-23

Table Receptacle ...................... A-27

Auto Return Function .............. A-29

Upholstery Heater System ...... A-32

(No Up or Down)

v vi vii

.

A-11 A-14

ACCESS PROCEDURES

Table Shrouds

Removal/Installation ......... C-2

Raising / Lowering

Table Manually .................. C-5

Upholstery Removal/Installation:

Ritter models.......................

Section C

Midmark models .................

Chair Arm / Brace

Removal ............................. C-8

Top Cover

Removal / Installation ....... C-9

Back Limit Switch Access . C-9

WIRING DIAGRAMS

222 ........................................ D-1

223 ........................................ D-1

622 ........................................ D-1

623 ........................................ D-1

C-6* C-7*

Section D

EXPLODED VIEWS / PARTS LISTS

222 .........................................E-2

223 .........................................E-3

622 .........................................E-4

623 .........................................E-5

Section E

COMPONENT TESTING & REPLACEMENT

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

Limit Switches .......................... B-4

Foot Control ............................. B-6

Base / Back Actuator ............... B-11

Section B

Back Release Mechanism ....... B-17

Main PC Board ......................... B-19

Table Of Contents

Drawer Heater System ............ B-23

Upholstery Heater System ...... B-29

FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

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

Rev. 7/09

General Information

Go To Table Of Contents

Symbols

Caution

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

Equipment Alert

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

Note

Amplifies a procedure, practice, or condition.

In Section A, test the components in the order indicated. (ex.

1st

then,











These symbols are used throughout this manual to represent the operational status of table functions and components.

Refer to Section B for component testing procedures.

2nd

)







Ordering Parts

The following information is required when ordering parts:

• Serial number & model number

• Part number for desired part.

[Refer to Exploded Views / Parts Lists section]

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

For warranty part orders, call Midmark's Technical Service Department with the required information.

Hours: 8:00 am until 5:00 pm EST [Monday - Friday] Phone: 1-(800)-Midmark

Serial Number Location

General Information

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

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

Indicates the function / component is not working at all.

MA731100i

Serial / Model

Number Label

(exact location may vary)

iii

Rev. 8/24/12

General Information

Go To Table Of Contents

Specifications

Patient Weight (maximum) ................................400 lbs (181.4 kgs)

Paper Roll (maximum size): ..............................21 in. long x 3.5 in. diameter

(53.3 x 8.9 cm)

Export models ....................................................19.7 in. long x 4.7 in. diameter

(50 cm x 12 cm)

Range of Motion .................................................

Dimensions .........................................................

See illustration on this page See illustration on next page

Max.

37 +0.5 in.

(94 +1.3 cm)

Weight of Table:

[230 VAC models only: 230 V transformer adds 14.5 lbs (6.5 kg)]

w/ upholstery .....................................................325 lbs (147.4 kg)

w/packaging & skid

Weight of Upholstery:

w/packaging

Power Cord(s)

Electrical Rating: ................................................

Foot Control Voltage: ......................................... 14 VAC, SELV (Safety Extra Low Voltage)

Duplex Receptacle

maximum load: .................................................

Fuses: ..................................................................Refer to:

Duty Cycle

:

Actuator motor run time

(Domestic: 30 seconds ON / 5 minutes OFF)

(Export: 25 seconds ON / 7 minutes OFF)

Receptacle / Drawer Heater / Uph. Htr

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

Ordinary Equipment, Intermittent Operation (Domestic: 30 seconds ON / 5 minutes OFF)

(Export: 25 seconds ON / 7 minutes OFF)

(no upholstery) .................

(shipped separately) .................

[115V models have two cords]

: ...................................... Intermittent Operation

: ......8 ft. (243.8 cm) long

: .............. Continuous Operation

375 lbs (192.7 kg)

40 lbs (18.1 kg)

See Compliance Charts

115 VAC, 5A

Section E - Fuses

623 only

Home Height

20 +0.5 in.

(50.8 +1.3 cm)

0° (horizontal) to

+80° +5°

Min.

18 +0.5 in.

(45.7 +1.3 cm)

Pelvic Tilt

(optional)

Max: 7° +2°

Min: 1.5°

Protection against ingress of fluids: ................ IPX0

Regulatory Compliance: ....................................

Table Speeds

Base ...................................................................... 14 - 26 seconds

Back

(models w/power back) ...............................

iv

(by function):

Rev. 12/18/12

See Regulatory Compliance Charts

15 - 20 seconds

[Foot Control only: IPX1]

MA599801i

Model Identification / Compliance Chart - 222

Go To Table Of Contents

General Information

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200-222 elbaTcisaBrettiR

300-222elbaTcisaBrettiR

400-222 elbaTcisaBrettiR

500-222elbaTcisaBrettiR

600-222 elbaTcisaBrettiR

700-222elbaTcisaBrettiR

800-222 elbaTcisaBrettiR

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511 11 06/05

03257.206/05

032 3 06/05

5115.0106/05

Fire Code Ratings:

All upholstery complies with California Bureau of Home Furnishing Technical Bulletin 117.

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General Information

Go To Table Of Contents

Model Identification / Compliance Chart - 223

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100-322

200-322

300-322

400-322

500-322

600-322

700-322

800-322

900-322

010-322

110-322

210-322

310-322

410-322

510-322

610-322

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vi

Model Identification / Compliance Chart - 622 / 623

Go To Table Of Contents

General Information

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100-226

200-226

300-226

400-226

500-226

600-226

700-226

800-226

100-326

200-326

300-326

400-326

500-326

600-326

700-326

800-326

900-326

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511 5.31 06/05

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Fire Code Ratings:

vii

General Information

Interval

Inspection or

Service

Service, Adjust , Repair

and / or Replace as Required

(Refer to appropriate S&P or Quick Reference Guide)

222 223 622 623

Clean upholstery with diluted bleach solution.

10:1 (water:bleach)

X X X X

Wipe painted metal & plastic surfaces with a clean soft cloth and

mild cleaner. (NOTE: Periodic application of common furniture

wax will ease cleaning, and maintain the luster of the surfaces).

X X X X

Obvious Damage

Visually inspect components for damage that could cause

problems during operation or unsafe operation.

X X X X

Check all mechanical functions using the foot control. Repeat

using the hand control when present.

X X X X

Check manual back releaase mechanism for proper operation.

X X X X

Table shrouds should move smoothly & quietly when base is

raised & lowered. (NOTE: There are plastic glides on the shroud

tabs. Missing glides may result in noisy operation.)

X X X X

Labels / Decals Replace any missing or illegible labels.

X X X X

Lubricate back hinge with light machine oil.

X X X X

Lubricate footrest slide with household furniture wax.

X X X X

Hardware All fasteners must be present and fastened securely.

X X X X

Inspect power cord and all wiring for damage.

X X X X

Be sure all electrical connections are tight.

X X X X

Stirrups

Check that stirrups extend easily, and lock securely into each

lateral position.

X X X X

Date of Service: _____/____/____

Location:

Service

Technician:

Serial Number:

Mechanical

Operation

Semi-Annually

Lubricate

Scheduled Maintenance / Barrier-Free® Examination Table

Weekly

Cleaning

Electrical System

Model:

Go To Table Of Contents

viii

Rev. 10/24/12

Warranty Information

Go To Table Of Contents

General Information

SCOPE OF WARRANTY

Midmark Corporation (“Midmark”) warrants to the original purchaser its new Alternate Care products and components (except for components not warranted under “Exclusions”) manufactured by Midmark to be free from defects in material and workmanship under normal use and service. Midmark’s obligation under this warranty is limited to the repair or replacement, at Midmark’s option, of the parts or the products the defects of which are reported to Midmark within the applicable warranty period and which, upon examination by Midmark, prove to be defective.

APPLICABLE WARRANTY PERIOD

The applicable warranty period, measured from the date of delivery to the original user, shall be one (1) year for all warranted products and components.

EXCLUSIONS

This warranty does not cover and Midmark shall not be liable for the following: (1) repairs and replacements because of misuse, abuse, negligence, alteration, accident, freight damage, or tampering; (2) products which are not installed, used, and properly cleaned as required in the Midmark “Installation” and or “Installation / Operation Manual for this applicable product. (3) products considered to be of a consumable nature; (4) accessories or parts not manufactured by Midmark; (5) charges by anyone for adjustments, repairs, replacement parts, installation, or other work performed upon or in connection with such products which is not expressly authorized in writing in advance by Midmark.

EXCLUSIVE REMEDY

Midmark’s only obligation under this warranty is the repair or replacement of defective parts. Midmark shall not be liable for any direct, special, indirect, incidental, exemplary, or consequential damages or delay, including, but not limited to, damages for loss of profits or loss of use.

NO AUTHORIZATION

No person or firm is authorized to create for Midmark any other obligation or liability in connection with the products.

Additional Information

Failure to follow the guidelines listed below will void the warranty and/or render the table unsafe for use.

• If a malfunction is detected, do not use the table until

necessary repairs are made.

• Do not attempt to disassemble table, replace

components, or perform adjustments unless you are a Midmark authorized service technician.

• Do not use another manufacturer's parts to replace

malfunctioning components. Use only Midmark replacement parts

THIS WARRANTY IS MIDMARK’S ONLY WARRANTY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED. MIDMARK MAKES NO IMPLIED WARRANTIES OF ANY KIND INCLUDING ANY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. THIS WARRANTY IS LIMITED TO THE REPAIR OR REPLACE MENT OF DEFECTIVE PARTS.

SF-1487 REV. A1

ix

Troubleshooting

Go To Table Of Contents

Click on the Go To Page button and enter the desired

page number. (Note: Letters are case sensitve. ex. A-2)

Go To Page:

Troubleshooting

Table Function Page

Base Up / Down ................................... A-2

Back Up / Down .................................... A-11

Drawer Heater ....................................... A-23

Table Receptacle .................................. A-27

Auto Return .......................................... A-29

Upholstery Heater System.................... A-32

Section A

Models:

Serial Numbers:

A-1

Troubleshooting

Go To Table Of Contents

Go To Page:

Base UP / DOWN Function

This illustration shows only the components that affect the Base UP / DOWN function.

Refer to the following page for a detailed description of current flow during this function.

Primary Fuses

NOTE:

Line voltage (230 VAC) is supplied thru two fuses

inlet)

line voltage to 115 VAC before it reaches the PC Board.

230 VAC models only

(located by the power cord

to a transformer that reduces the

[All Functions]

115 VAC

[Base Up & Down Functions]

Base Motor Fuse

Troubleshooting

[Base Up / Down Function]

Problem Page

No UP or DOWN Functions

No UP Function (DOWN - OK) No DOWN Function (UP - OK)

Base Drifts Down .................................

Moves Wrong Direction .......................

Noisy Operation ...................................

Moves Slowly ....................................

................ A-4

............ A-5

............ A-6

A-7

A-8

A-9

A-10

A-2

Transformer Fuse

[All Functions]

Foot Control

Base Up / Down

Main PC Board

14 VAC

Base Up Limit Switch

[Base Up will not operate if switch is tripped]

Models:

Serial Numbers:

All

48 VDC

MA627300i

Base Actuator

Base Down Limit Switch

[Base Down will not operate if switch is tripped]

Troubleshooting

Go To Table Of Contents

Base UP / DOWN Function

NOTE

On 230 VAC models, line voltage supplied thru two fuses to a transformer that reduces the line voltage to 115 VAC before it gets to the PC board.

Power To Foot Control

115 VAC is supplied thru the two primary fuses

(F1 & F2) [F4 fuse protects the transformer]

The transformer reduces the line voltage and supplies 14 VAC to the foot control.

to the transformer on the PC board.

(located by IEC inlet)

(230 VAC)

.

is

Base Up Operation

NOTE

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

When the Base Up function is activated, current switch on the PC Board energizes the base relay.

[F3 fuse protects the base motor]

(14 VAC)

(N.O)

flows thru the Up function foot

, then back to the PC board. Circuitry

.

NOTE

The Base Up/Down relay has four contacts:

(2) Normally Open: Base Up function

(2) Normally Closed: Base Down function

When the base relay is energized, the (2) Normally Open contacts of the relay close. When these contacts close, current (

48 VDC)

When current flows to the actuator thru the Normally Open contacts of the relay, the actuator motor runs and raises the table.

Actuator Motor runs until:

1. Foot control pedal is released.

2. Base Up limit switch is tripped.

3. 26 second software time limit is reached.

4. Fuse(s) opens (blows).

flows to the actuator motor.

[Primary, Base Motor, Transformer fuse]

Base Down Operation

NOTE

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

When the Base Down function is activated, current switch

(14 VAC)

(N.O.)

flows thru the Down function foot

, then back to the PC Board.

NOTE

The Base Up/Down relay has four contacts:

(2) Normally Open: Base Up function

(2) Normally Closed: Base Down function

When this voltage is applied, current to the actuator motor thru the (2) Normally Closed contacts of the Base Up/Down relay.

[The relay does not energize].

When voltage flows to the actuator thru the Normally Closed contacts of the relay, the actuator motor runs andlowers the table.

Actuator Motor runs until:

1. Foot control pedal is released.

2. Base Down limit switch is tripped.

3. 26 second software time limit is reached.

4. Fuse(s) opens (blows).

[Primary, Base Motor, Transformer fuse]

(48 VDC)

flows

Models:

Serial Numbers:

All

Equipment Alert

If an overload condition* is detected the PC board will "beep" and all power functions will be disabled. Release the function button, remove load, then retry function.

*(weight limit exceeded, mechanical binding, etc),

Base Up / Down

Rev. 8/24/12

A-3

Troubleshooting

Go To Table Of Contents

Go To Page:

Refer To: Page

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

Limit Switches.............................. B-4

Foot Control ................................. B-6

Base / Back Actuator ................... B-11

Base Relay Test .......................... B-20

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

Exploded Views / Part Numbers ....E-1

Loose Wire Connections

(esp. Foot Control & Base Up/Down Limit Switches)

1st







noitcnuFsutatSmelborP

Base Up No movement

Base Down No movement

Perform

Refer to: Section B - Foot Control

Footswitch Test

A-4

Base Actuator

To isolate the malfunction, Refer to: Section B - Base / Back Actuator

3rd







Base Up / Down

Rev. 2/08

Serial Numbers:

4th

Models:







MA626600i

All

230 V models only

230 VAC Transformer Fuses (2)

Refer to: Section B - Fuses

230 VAC Transformer

Main PC Board Fuse(s):

[Test fuses: F1, F2, F3, & F4] Refer to: Section B - Fuses

Perform

Refer to: Section B - Main PC Board

Base Relay Test







230 V models only

2nd







5th











noitcnuFsutatSmelborP

Go To Table Of Contents

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Base Up No movement

Base Down OK

Loose Wire Connections

(esp. Foot Control & Base Up/Down Limit Switches)

1st







Troubleshooting

Refer To: Page

Limit Switches.............................. B-4

Footswitch Test ........................... B-6

Base Relay Test .......................... B-20

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

Exploded Views / Part Numbers ....E-1

Perform

Refer to: Section B - Foot Control

Models:

Serial Numbers:

Base Up Limit Switch

Perform

Refer to: Section B - Limit Switches

Footswitch Test

Limit Switch Test.

3rd

All







2nd







MA626800i

Perform

Refer to: Section B - Main PC Board

Base Relay Test

4th







Base Up / Down

Rev. 2/08

A-5

Troubleshooting

Go To Table Of Contents

Go To Page:

Refer To: Page

Limit Switches.............................. B-4

Foot Control ................................. B-6

Base Relay Test .......................... B-20

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

Exploded Views / Part Numbers ....E-1

Loose Wire Connections

(esp. Foot Control & Base Down Limit Switches)

1st







noitcnuFsutatSmelborP

Base Up OK

Base Down No movement

Perform

Refer to: Section B - Foot Control

A-6

Footswitch Test

Base Up / Down

Base Down Limit Switch

Perform

Refer to: Section B - Limit Switches

Rev. 2/08

Limit Switch Test.

3rd







Models:

Serial Numbers:

All

2nd







MA626700i

Perform

Refer to: Section B - Main PC Board

Base Relay Test

4th







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Base Up Table drifts down.

Base Down Table drifts down.

Run table up, then unplug power cord.

If drifting stops, perform If drifting continues, check Base Actuator.

Footswitch Test

.

1st







Troubleshooting

Refer To: Page

Foot Control ................................. B-6

Base / Back Actuator ................... B-11

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

Exploded Views / Part Numbers ....E-1

Models:

Serial Numbers:

Perform

Refer to: Section B - Foot Control

Footswitch Test

All







MA626900i

Base Actuator

To isolate the malfunction, Refer to: Section B - Base / Back Actuator







Base Up / Down

A-7

Troubleshooting

Go To Table Of Contents

Go To Page:

Refer To: Page

Main PC Board Replacement ....... B-22

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

Exploded Views / Part Numbers ....E-1

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Base Up Press Base UP pedal,

table moves DOWN.

Base Down Press Base DOWN pedal,

table moves UP.

A-8

Wire connections

(Check Foot Control & Base Actuator motor connections)

Base Up / Down

(reversed?)

Models:

Serial Numbers:

1st







All

MA627000i

Replace Main PC Board

Refer to: Section B - Main PC Board

2nd







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Base Up Noisy / grinding / squeaking

Base Down Noisy / grinding / squeaking

Troubleshooting

Refer To: Page

Base Actuator Replacement .........B-11

Table Shroud Removal ..................C-2

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

Exploded Views / Part Numbers ....E-1

Clean and lubricate base actuator threads.

Recommended lubricant: Lithium grease If necessary, refer to:

Section C - Table Shroud Removal

1st







Remove any debris from base slides.

Do not lubricate base slides. If necessary, refer to:

Models:

Serial Numbers:

2nd

Section C - Table Shroud Removal

All







MA627100i

3rd

Replace Base Actuator

Refer to: Section B - Base / Back Actuator







Base Up / Down

A-9

Troubleshooting

Go To Table Of Contents

Go To Page:

Refer To: Page

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

Exploded Views / Part Numbers .. E-1

Did patient exceed 400 lb. weight limit?

Inform staff that max. patient weight is 400 lbs.

1st







noitcnuFsutatSmelborP

Base Up Moves slowly

Base Down Moves slowly

A-10

Base Up / Down

Models:

Serial Numbers:

All

MA627200i

Low voltage to table

Required voltage:

115 VAC models ............... 115

230 VAC models .............. 230

2nd

+10% VAC +10% VAC







MA630300i

Back UP / DOWN Function (Manual)

Go To Table Of Contents

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This illustration shows only the components that affect the Back UP / DOWN function.

Cam

Troubleshooting

[Back Up / Down Function (Manual)]

Problem Page

Back Drifts Up or Down .....................

No Movement ....................................

Difficult To Position ............................

A-12

A-13

Back Up / Down Operation

When either back release handle is squeezed, linkage causes the cam to rotate. When the cam compresses the pin on the top of the gas cylinder, the pressure inside the cylinder is released and the back section can be positioned Up or Down.

Back Release

Handle

(Manual)

Gas Cylinder

Models:

Serial Numbers:

222 (all)

All

622 (all)

All

Back Up / Down

Manual

A-11

Troubleshooting

Go To Table Of Contents

Go To Page:

Refer To: Page

Back Release Handle

Adjustment ............................. B-17

Gas Cylinder

Replacement & Adjustment.... B-18

Exploded Views / Part Numbers .. E-1

Gas cylinder screwed in too far.

Perform Gas Cylinder Adjustment Refer to: Section B - Back Release Mechanism

1st







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Back Up/Down Back section drifts

2nd





Perform

Handle Adjustment

Refer to: Section B - Back Release Mechanism

Replace Gas Cylinder

Refer to: Section B - Back Release Mechanism

Back Release

3rd







A-12

Back Up / Down

Manual

Models:

Serial Numbers:

222 (all)

All

MA630400i

622 (all)

All

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Back Up/Down No movement

Troubleshooting

Difficult to position

Gas cylinder not screwed in far enough.

Perform Gas Cylinder Adjustment Refer to: Section B - Back Release Mechanism

3rd





Replace Gas Cylinder

Refer to: Section B - Back Release Mechanism



1st







Refer To: Page

Back Release Handle

Adjustment ............................. B-17

Gas Cylinder

Replacement & Adjustment.... B-18

Exploded Views / Part Numbers .. E-1

2nd

Perform

Handle Adjustment

Refer to: Section B - Back Release Mechanism

Back Release







Models:

Serial Numbers:

222 (all)

All

622 (all)

All

MA630400i

Back Up / Down

Manual

A-13

Troubleshooting

Go To Table Of Contents

Go To Page:

Back UP / DOWN Function (Power)

This illustration shows only the components that affect the Back UP / DOWN function.

Refer to the following page for a detailed description of current flow during this function.

Primary Fuses

[All Functions]

NOTE:

Line voltage (230 VAC) is supplied thru two fuses

inlet)

line voltage to 115 VAC before it reaches the PC Board.

230 VAC models only

(located by the power cord

to a transformer that reduces the

115 VAC

[Back Up / Down Functions]

Back Motor Fuse

Troubleshooting

[Back Up / Down Function (Power)]

Problem Page

No UP or DOWN Functions

No DOWN Function (UP - OK) No UP Function (DOWN - OK)

Back Drifts Down .................................

Moves Wrong Direction .......................

Noisy Operation ...................................

Moves Slowly ......................................

................ A-16

............ A-17

............ A-18

A-19

A-20

A-21

A-22

A-14

Transformer Fuse

[All Functions]

Back Up / Down

Power

14 VAC

Foot Control

Back Up Limit Switch

[Back Up will not operate if switch is tripped]

Models:

Serial Numbers:

Main PC Board

223 (all)

All

48 VDC

Back Actuator

Back Down Limit Switch

[Back Down will not operate if switch is tripped]

MA630200i

623 (all)

All

Troubleshooting

Go To Table Of Contents

Back UP / DOWN Function (Power)

NOTE

On 230 VAC models, line voltage supplied thru two fuses to a transformer that reduces the line voltage to 115 VAC before it gets to the PC board.

Power To Foot Control

115 VAC is supplied thru the two primary fuses

(F1 & F2) [F4 fuse protects the transformer]

The transformer reduces the line voltage and supplies 14 VAC to the foot control.

to the transformer on the PC board.

(located by IEC inlet)

(230 VAC)

.

is

Back Up Operation

NOTE

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

When the Back Up function is activated, current switch on the PC Board energizes the back relay.

[F5 fuse protects the back motor]

(14 VAC)

(N.O)

flows thru the Up function foot

, then back to the PC board. Circuitry

.

NOTE

The Back Up/Down relay has four contacts:

(2) Normally Open: Back Up function

(2) Normally Closed: Back Down function

When the back relay is energized, the (2) Normally Open contacts of the relay close. When these contacts close, current (

48 VDC)

When current flows to the actuator thru the Normally Open contacts of the relay, the actuator motor runs and raises the back section.

Actuator Motor runs until:

1. Foot control pedal is released.

2. Back Up limit switch is tripped.

3. 26 second software time limit is reached.

4. Fuse(s) opens (blows).

flows to the actuator motor.

[Primary, Back Motor, Transformer fuse]

Back Down Operation

NOTE

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

When the Back Down function is activated, current switch

(14 VAC)

(N.O.)

flows thru the Down function foot

, then back to the PC Board.

NOTE

The Back Up/Down relay has four contacts:

(2) Normally Open: Back Up function

(2) Normally Closed: Back Down function

When this voltage is applied, current to the actuator motor thru the (2) Normally Closed contacts of the Back Up/Down relay.

[The relay does not energize].

When voltage flows to the actuator thru the Normally Closed contacts of the relay, the actuator motor runs and lowers the back section.

Actuator Motor runs until:

1. Foot control pedal is released.

2. Back Down limit switch is tripped.

3. 26 second software time limit is reached.

4. Fuse(s) opens (blows).

[Primary, Back Motor, Transformer fuse]

(48 VDC)

flows

Models:

Serial Numbers:

223 (all)

All

623 (all)

All

Equipment Alert

If an overload condition* is detected the PC board will "beep" and all power functions will be disabled. Release the function button, remove load, then retry function.

*(weight limit exceeded, mechanical binding, etc),

Back Up / Down

Power

Rev. 8/24/12

A-15

Troubleshooting

Go To Table Of Contents

Go To Page:

Refer To: Page

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

Limit Switches.............................. B-4

Foot Control ................................. B-6

Base / Back Actuator ................... B-11

Back Relay Test .......................... B-21

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

Exploded Views / Part Numbers ....E-1

noitcnuFsutatSmelborP

Back Up No movement

Back Down No movement

Loose Wire Connections

(esp. Foot Control & Back Up/Down Limit Switches)

Main PC Board Fuse(s):

[Test fuses: F1, F2, F4, & F5] Refer to: Section B - Fuses

Perform

Refer to: Section B - Main PC Board

Perform

Refer to: Section B - Foot Control

Footswitch Test

Back Relay Test

3rd







1st







5th

2nd











MA630100i

Back Actuator

To isolate the malfunction, Refer to: Section B - Base / Back Actuator

230 V models only

230 VAC Transformer Fuses (2)

Refer to: Section B - Fuses

230 VAC Transformer

4th

230 V models only















A-16

Back Up / Down

Power

Rev. 5/07

Models:

Serial Numbers:

223 (all)

All

623 (all)

All

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Back Up OK

Back Down No movement

Loose Wire Connections

(esp. Foot Control & Back Down Limit Switches)

1st







Troubleshooting

Refer To: Page

Limit Switches.............................. B-4

Foot Control ................................. B-6

Back Relay Test ......................... B-18

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

Exploded Views / Part Numbers .. E-1

Perform

Refer to: Section B - Foot Control

Footswitch Test

3rd







MA629200i

Back Down Limit Switch

Perform

Refer to: Section B - Limit Switches

Limit Switch Test.

Perform

Refer to: Section B - Main PC Board

Back Relay Test

2nd







4th







Models:

Serial Numbers:

223 (all)

All

623 (all)

All

Back Up / Down

Power

A-17

Troubleshooting

Go To Table Of Contents

Go To Page:

Refer To: Page

Limit Switches.............................. B-4

Foot Control ................................. B-6

Back Relay Test ......................... B-18

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

Exploded Views / Part Numbers .. E-1

Loose Wire Connections

(esp. Foot Control & Back Up Limit Switches)

1st







noitcnuFsutatSmelborP

Back Up No movement

Back Down OK

Back Up Limit Switch

Perform

Refer to: Section B - Limit Switches

Limit Switch Test.

2nd







A-18

Perform

Refer to: Section B - Foot Control

Back Up / Down

Power

Footswitch Test

Serial Numbers:

3rd







Models:

223 (all)

All

MA629100i

623 (all)

All

Perform

Refer to: Section B - Main PC Board

Back Relay Test

4th







noitcnuFsutatSmelborP

Go To Table Of Contents

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Back Up Back drifts down.

Back Down Back drifts down.

Run back section up, then unplug power cord.

If drifting stops, perform If drifting continues, check Back Actuator.

Footswitch Test

.

1st







Troubleshooting

Refer To: Page

Foot Control ................................. B-6

Base / Back Actuator .................. B-11

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

Exploded Views / Part Numbers .. E-1

Models:

Serial Numbers:

Perform

Refer to: Section B - Foot Control

Footswitch Test

223 (all)

All

623 (all)

All







MA629300i

Back Actuator

To isolate the malfunction, Refer to: Section B - Base / Back Actuator







Back Up / Down

Power

A-19

Troubleshooting

Go To Table Of Contents

Go To Page:

Refer To: Page

Main PC Board Replacement ....... B-22

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

Exploded Views / Part Numbers ....E-1

noitcnuFsutatSmelborP

Back Up Press Back UP pedal,

back section moves DOWN.

Back Down Press Back DOWN pedal,

back section moves UP.

A-20

Wire connections

(Check Foot Control & Base Actuator motor connections)

Back Up / Down

Power

(reversed?)

Models:

Serial Numbers:

1st







223 (all)

All

MA629400i

Replace Main PC Board

Refer to: Section B - Main PC Board

623 (all)

All

2nd







noitcnuFsutatSmelborP

Go To Table Of Contents

Go To Page:

Back Up Noisy / grinding / squeaking

Back Down Noisy / grinding / squeaking

Troubleshooting

Refer To: Page

Back Actuator Replacement ....... B-15

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

Exploded Views / Part Numbers .. E-1

Clean and lubricate back actuator threads.

Recommended lubricant: Lithium grease

[NOTE: Unscrew the shaft cover to access actuator threads.

]

1st







Models:

Serial Numbers:

223 (all)

All

623 (all)

All

MA629500i

3rd

Replace Back Actuator

Refer to: Section B - Base / Back Actuator







Back Up / Down

Power

A-21