Samsung 4qt12whwe Service Manual page 18

5-3-4 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
Remove power cord and plug in again in approx.
Is STD lamp blinking?
Does operation start when
swing button of the remote control unit
Voltage at pin #57~#60
of micom (IC04) change?
Voltage at pin #16 of
IC06(ULN2003A) and #10~#12 of
IC08(ULN2003A) change?
UP/DOWN louver motor is faulty.
Samsung Electronics
5 seconds.
Yes
pushed?
No
(Squarewave)
Yes
(Squarewave)
Yes
No
Check as in the procedure
"No Power parts".
Yes
No
Micom (IC04) is faulty.
No
Driver IC06/08 (ULN2003A) is faulty.
Troubleshooting
Normal
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