646 Chair Troubleshooting Chart

Symptom

Probable Cause

Check

Correction

Power light is OFF.

Facility supply voltage.

Power cord connections and facility circuit breaker.

Secure power cord connections. Reset circuit breaker if necessary.

Primary fuse(s) blown.

Inspect fuses.

Replace faulty fuse(s).

Main PC board.

Wire connections between power cord and main PC board.

Secure loose connections. If connections are OK, replace main PC board.
Power light is ON.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

Symptom

Probable Cause

Check

Correction

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

Power cord connection.

Check both power cord connections.

Secure both power cord connections.

Receptacle circuit breaker(s).

Check if receptacle circuit breaker(s) tripped.

Reset receptacle circuit breaker(s) at rear of chair base.

Loose / damaged wire connections.

Wire connections between receptacle power cord and table receptacles.

Secure / repair wire connections.

Symptom

Probable Cause

Check

Correction

Foot extension will not lock in place or foot extension will not release.

Foot extension locking mechanism malfunctioning.

Perform Locking Mechanism Inspection. Refer to: Foot Extension

Follow instructions outlined in link.
Symptom Probable Cause Check Correction

No Back Up or Back Down.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

Loose / damaged wire connections.

Check wire connections to back actuator and back limit switches. Check wire connections between main system transformer and main PC board (black and white wires).

Secure any loose connections.

Back actuator / main PC board.

Isolate the malfunction. Refer to: Back Actuator / Limit Switches

Follow test sequence outlined in link.

No Back Up, Back Down OK or No Back Down, Back Up OK.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

No Back Up - Back Up limit switch. No Back Down - Back Down limit switch.

Wire connections to limit switch.

Replace back limit switch / bracket assembly. Refer to: Back Actuator / Limit Switches

Back actuator / main PC board.

Isolate the malfunction. Refer to: Back Actuator / Limit Switches

Follow test sequence outlined in link.

Back drifts down.

Back actuator / motor coupler.

Refer to: Back Actuator / Limit Switches

Replace motor coupler.

Noisy operation - Grinding, squeaking, etc.

Back actuator.

Refer to: Back Actuator / Limit Switches

Follow instructions outlined in link.

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

Patient exceeded 450 lbs weight limit.

Check if Patient exceeded 450 lbs weight limit.

Inform staff that max patient weight is 450 lbs.

Low voltage to table.

Check supply voltage. Required: 115 VAC +10%

Connect adequate supply voltage.

Back actuator motor.

Perform Actuator Motor Test. Refer to: Back Actuator / Limit Switches

Follow test sequence outlined in link.

Symptom Probable Cause Check Correction

No Tilt Up or Tilt Down.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

Loose / damaged wire connections.

Check wire connections to tilt actuator and tilt down limit switch.

Secure any loose connections.

Tilt actuator / main PC board.

Isolate the malfunction. Refer to: Tilt Actuator / Limit Switch / Sensor PC Board

Follow test sequence outlined in link.

No Tilt Up, Tilt Down OK or No Tilt Down, Tilt Up OK.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

No Tilt Down - Crash Avoidance System.

Isolate the malfunction. Refer to: Tilt Actuator / Limit Switch / Sensor PC Board

Follow test sequence outlined in link.

No Tilt Down - Tilt Down limit switch.

Check wire connections to limit switch.

If connections are OK, perform Limit Switch Test. Refer to: Tilt Actuator / Limit Switch / Sensor PC Board

Tilt actuator / main PC board.

Isolate the malfunction. Refer to: Tilt Actuator / Limit Switch / Sensor PC Board

Follow test sequence outlined in link.

Tilt Up / Down OK but beeps in full Up position.

Sensor PC board.

Perform Sensor PC Board Check. Refer to: Tilt Actuator / Limit Switch / Sensor PC Board

Replace Sensor PC Board if necessary.

Seat drifts down.

Tilt actuator / motor coupler.

Refer to: Tilt Actuator / Limit Switch / Sensor PC board

Replace motor coupler.

Noisy operation - Grinding, squeaking, etc.

Tilt actuator.

Refer to: Tilt Actuator / Limit Switch / Sensor PC board

Follow instructions outlined in link.

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

Patient exceeded 450 lbs weight limit.

Check if Patient exceeded 450 lbs weight limit.

Inform staff that max patient weight is 450 lbs.

Low voltage to table.

Check supply voltage. Required: 115 VAC +10%

Connect adequate supply voltage.

Tilt actuator motor.

Perform Actuator Motor Test. Refer to: Tilt Actuator / Limit Switch

Follow test sequence outlined in link.

Symptom

Probable Cause

Check

Correction

Power light is OFF.

Facility supply voltage.

Power cord connections and facility circuit breaker.

Secure power cord connections. Reset circuit breaker if necessary.

Power light is ON.

Primary fuse(s) blown.

Inspect fuses.

Replace faulty fuse(s).

Power / QuickChair PC board.

Wire connections between power cord and Power / Quick Chair PC board.

Secure loose connections. If connections are OK, replace Power / QuickChair PC board.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

Symptom

Probable Cause

Check

Correction

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

Power cord connection.

Check both power cord connections.

Secure both power cord connections.

Receptacle circuit breaker(s).

Check if receptacle circuit breaker(s) tripped.

Reset receptacle circuit breaker(s) at rear of chair base.

Loose / damaged wire connections.

Wire connections between receptacle power cord and table receptacles.

Secure / repair wire connections.

Symptom

Probable Cause

Check

Correction

Foot extension will not lock in place or foot extension will not release.

Foot extension locking mechanism malfunctioning.

Foot extension locking mechanism. Refer to: Locking Mechanism Inspection

Replace faulty component(s).

Symptom Probable Cause Check Correction

No Back Up or Back Down.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

Loose / damaged wire connections.

Check wire connections to Back actuator and Back limit switches.

Secure any loose connections.

Back actuator / Motor Control PC board.

Refer to: Back Actuator / Limit Switches

Follow test sequence outlined in link.

No Back Up, Back Down OK or No Back Down, Back Up OK.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

No Back Up - Back Up limit switch. No Back Down - Back Down limit switch.

Wire connections to limit switch.

Replace limit switch / bracket assembly. Refer to: Back Actuator / Limit Switches

Back actuator / Motor Control PC board.

Refer to: Back Actuator / Limit Switches

Follow test sequence outlined in link.

Back drifts down.

Back actuator / motor coupler.

Refer to: Back Actuator / Limit Switches

Replace motor coupler.

Noisy operation - Grinding, squeaking, etc.

Back actuator.

Refer to: Back Actuator / Limit Switches

Follow instructions outlined in link.

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

Patient exceeded 450 lbs weight limit.

Check if Patient exceeded 450 lbs weight limit.

Inform staff that max patient weight is 450 lbs.

Low voltage to table.

Check supply voltage. Required: 115 VAC +10%

Connect adequate supply voltage.

Back actuator motor.

Perform Actuator Motor Test. Refer to: Back Actuator / Limit Switches

Follow test sequence outlined in link.

Symptom Probable Cause Check Correction

No Tilt Up or Tilt Down.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

Loose / damaged wire connections.

Check wire connections to: tilt actuator, tilt down limit switch.

Secure any loose connections.

Tilt actuator / Motor Control PC board.

Refer to: Tilt Actuator / Limit Switch / Sensor PC board

Follow test sequence outlined in link.

No Tilt Up, Tilt Down OK or No Tilt Down, Tilt Up OK.

Foot control / touch pad.

Try activating functions from each touch pad / foot control.

Refer to: Foot Control / Touch Pads

No Tilt Down - Crash Avoidance System.

Refer to: Tilt Actuator / Limit Switch / Sensor PC board

Follow test sequence outlined in link.

No Tilt Down - Tilt Down limit switch.

Check wire connections to limit switch.

If connections are OK, perform Limit Switch Test. Refer to: Tilt Actuator / Limit Switch

Tilt actuator / Motor Control PC board.

Refer to: Tilt Actuator / Limit Switch / Sensor PC board

Follow test sequence outlined in link.

Tilt Up / Down OK but beeps in full Up position.

Tilt Up Sensor PC board.

Perform Sensor PC Board Check. Refer to: Tilt Actuator / Limit Switch

Replace Sensor PC Board if necessary.

Seat drifts down.

Tilt actuator / motor coupler.

Refer to: Tilt Actuator / Limit Switch / Sensor PC board

Replace motor coupler.

Noisy operation - Grinding, squeaking, etc.

Tilt actuator.

Refer to: Tilt Actuator / Limit Switch / Sensor PC board

Follow instructions outlined in link.

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

Patient exceeded 450 lbs weight limit.

Check if Patient exceeded 450 lbs weight limit.

Inform staff that max patient weight is 450 lbs.

Low voltage to table.

Check supply voltage. Required: 115 VAC +10%

Connect adequate supply voltage.

Tilt actuator motor.

Perform Actuator Motor Test. Refer to: Tilt Actuator / Limit Switch

Follow test sequence outlined in link.