Samsung APH289SEF Service Manual page 36

5-3-10 When Auto Shutter does not operate.("
1. Causes of Failure
1) Motor & Sensor PCB connecting harness cut or poor contact.
2) Poor Main PCB
3) Poor device
2. Inspection Items
1) Connecting harness?
2) Voltage of MICOM #33 while shutter operates. This shall be 5V; otherwise Main PCB must be poor?
3. Inspection Procedure
Check voltage between
CN704 No. #1 ↔ #5, 220V?
Samsung Electronics
Turn power off and on in 5 seconds.
Power on or off.
Rise with shutter.
Yes
Defection of both
shutter and motor
Check coil voltages of RY709(Open) and
RY710(Close), DC12V?
Exchange Relay.
- RY709 : Exchange in case poor Open.
- RY710 : Exchange in case poor Close.
" Error Mode)
Descend with shutter.
No
Check voltage between
CN704 No. #1 ↔ #5, 220V?
Yes
Defection of both
shutter and motor
No
Yes
Troubleshooting
Exchange Main PCB.
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