627 Chair Back Function Test and Repair

627 Chair Back Function Test and Repair

This illustration shows only the fuses and connections that affect the Back Up / Down function.

627 Chair Back Function Test and Repair 627 Chair Back Function Test and Repair

Anytime an Overtravel Limit Switch is detected open, both Base and Back functions are deactivated.

This illustration shows the Back limit switches, the serviceable components of the Back actuator, and the fuses on the Motor Control PC board. Use the table below to isolate the malfunction.

Problem

Required Action

Motor runs, but chair does not move.

Inspect / replace motor coupler.

Motor does not run.

Check Motor Control PC board fuses (F1, F2).

Check limit switch wire connections.

Test Limit Switch(es).

627 Chair Back Function Test and Repair

Equipment Alert

Do not to move chair past limit switches or equipment could be damaged.

1.Disconnect power to the chair.

2.Disconnect Base actuator connection J2.

3.Move Back wire connection J1 to Back PC Board connection J2.

4.Connect power to chair.

5.Using the hand / foot control, press and hold Base Up button briefly.

6.Using the hand / foot control, press and hold Base Down button briefly.

Did Back Move Up and Down in Step 2

Required Action

Yes

Actuator is OK

No

Replace actuator

7.Reconnect Back actuator connections.

8.Reconnect Base actuator connections.

627 Chair Back Function Test and Repair

1.Disconnect power to the chair.

2.Disconnect Back actuator from J1 on PC Board.

3.Set multimeter to Ohms to check resistance.

4.Using a multimeter, place meter probes on actuator wires.

Meter Reading

 Required Action

1 - 20 Ohms

Actuator motor is good.

OL

Replace actuator motor.

627 Chair Back Function Test and Repair

Caution

Risk of electrical shock. Always disconnect chair power for three minutes, allowing capacitance to dissipate prior to servicing the Motor Control PC board.

1.Disconnect power to the chair.

2.Disconnect Base actuator connection J2.

3.Move Back wire connection J1 to Back PC Board connection J2.

4.Connect power to chair.

5.Using the hand / foot control, press and hold Base Up button briefly.

6.Using the hand / foot control, press and hold Base Down button briefly.

Did Back Move Up and Down in Step 2

Required Action

Yes

Replace PC Board

No

Refer to: Back Function Components

7.Reconnect Back actuator connections.

8.Reconnect Base actuator connections.