Samsung AQV18FA Service Manual page 64

12-2-3 When the Up/Down Louver Motor Does Not Operate. (Initial Diagnosis)
1. Checklist :
1) Is input voltage normal?
2) Is the Up/Down louver motor properly connected with the connector (CN61)?
2. Troubleshooting procedure
Unplug the power cord and
plug it after 30 seconds
start when swing button
of the remote control unit
pin #30~#34 of micom (IC04)
change?(Squarewave)
pin #2 ~ #5 of CN61(motor connector)
change?(Squarewave)
Up/Down louver motor is faulty.
Samsung Electronics
Is STD lamp blinking?
Yes
Does operation
pushed?
No
Voltage at
Yes
Voltage at
Yes
No
Check as in the procedure
Yes
No
Micom (IC04) is faulty.
No
Driver IC05/06 (ULN2003A) is faulty.
Troubleshooting
No Power.
Normal
12-4