626 Chair Back Function Test and Repair
Back Function Fuses and Connections
Model Range 626-001 thru -004
This illustration shows only the fuses and connections that affect the Back Up / Down function.
Model Range 626-005 and -006
This illustration shows only the fuses and connections that affect the Back Up / Down function.
Base and Back Function Fuses and Connections
Model Range 626-001 thru -004
This illustration shows the fuses and connections that affect the Base Up / Down and Back Up / Down functions.
Model Range 626-005 and -006
This illustration shows the fuses and connections that affect the Base Up / Down and Back Up / Down functions.
Back Function Components
This illustration shows the Back limit switches, the serviceable components of the Back actuator, and the fuses on the Motor Control PC board.
Risk of electrical shock. Always disconnect chair power for three minutes, allowing capacitance to dissipate prior to servicing the Motor Control PC board.
Anytime an Overtravel Limit Switch is detected open, all functions are deactivated. Chair will continuously beep until powered down.
Use this table to isolate a 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 and F2. |
| Perform Limit Switch Diagnostic Test | |
|
Check limit switch wire connections. |
|
|
Test Limit Switch(es). |
Back Actuator Test
Risk of electrical shock. Always disconnect chair power for three minutes, allowing capacitance to dissipate prior to servicing the Motor Control PC board.
Do not to move chair past limit switches or equipment could be damaged.
1.Disconnect power to the chair.
2.Disconnect Base actuator connections, J4 and J15.
3.Move Back wire connection J2 to Base PC Board connection J4.
4.Move Back wire connection J16 to Base PC Board connection J15.
5.Connect power to chair.
6.Using the hand / foot control, press and hold Base Up button briefly.
7.Using the hand / foot control, press and hold Base Down button briefly.
|
Did Back Move Up and Down in Steps 6 and 7 |
Required Action |
|---|---|
|
Yes |
Actuator is OK |
|
No |
Replace actuator |
8.Reconnect Back actuator connections.
9.Reconnect Base actuator connections.
10.Calibrate Chair. Refer to: Calibration Procedure
Back Actuator Motor Resistance Test
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 Back actuator from J2 on PC Board.
3.Set multimeter to Ohms to check resistance.
4.Check resistance between the white and black wires.
5.Check resistance between the black and red wires.
6.Check resistance between the red and white wires.
|
Meter Reading |
Required Action |
|---|---|
|
3 - 25 Ohms |
Actuator motor is good. |
|
OL |
Replace actuator motor. |
Back Function / Motor Control PC Board Test
Risk of electrical shock. Always disconnect chair power for three minutes, allowing capacitance to dissipate prior to servicing the Motor Control PC board.
Do not to move chair past limit switches or equipment could be damaged.
1. Disconnect power to the chair.
2.Disconnect Base actuator connections J4 and J15.
3.Move Back wire connection J2 to Base PC Board connection J4.
4.Move Back wire connection J16 to Base PC Board connection J15.
5.Connect power to chair.
6.Using the hand / foot control, press and hold Base Up button briefly.
7.Using the hand / foot control, press and hold Base Down button briefly.
|
Did Back Move Up and Down in Steps 6 and 7? |
Required Action |
|---|---|
|
Yes |
Replace PC Board |
|
No |
Refer to: Back Function Components |
8.Reconnect Back actuator connections.
9.Reconnect Base actuator connections.
10.Calibrate Chair. Refer to: Calibration Procedure
