Samsung AS12HPCN, Service Manual

Page: 59 / 77

Troubleshooting
12-4 Samsung Electronics
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
12-2-4 In the HEAT mode, When there is no warm air current. Check this first;
1. Is the set temperature of Remote Control lower than room temperature in Heat mode?
2. Is the Indoor PCB properly connected with the CN71 connector?
Remove power cord and plug in again in approx. 5 seconds.
Is STD lamp blinking?
Does operation start when swing button of the
remote control unit pushed?
Voltage at pin #57~#60 of micom (IC04) change?(Squarewave)
Voltage at pin #2 ~ #3 of CN61(motor connector)
change?(Squarewave)
Up/Down louver motor is faulty.
Driver IC05/06 (ULN2003A) is faulty.
Micom (IC04) is faulty.
Normal
Check as in the procedure
"No Power".
After training on, the heating operation
should start in 5 minutes.
Is the number #38 of Micom (IC04) DC5.0V?
Is the number checking #11 of IC05 (ULN2003A) LOW?
Is the voltage between CN71 #1 and CN71 #5 rating voltage ±10% range
Abnormal 4-Way valve of Outdoor Unit.
or connecting Cable
4-Way valve should be replaced
or connecting Cable Check.
No
Yes
Yes
Yes
No
No
No
Yes
Normal
Abnormal Micom
Abnormal IC05
Abnormal RY73
PCB should be replaced.
Yes
No
No
Yes
No
No
Yes
Yes
24610A(1)_1 11/10/05 6:26 PM Page 10-9