Samsung SH18AP0D Service Manual page 28

6-2-6 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. 5 seconds.
Does operation start when swing button of the
Voltage at pin #57~#60 of micom (IC04) change?(Squarewave)
Voltage at pin #2 ~ #5 of CN61(motor connector)
UP/DOWN louver motor is faulty.
6-2-7 In the HEAT mode, When there is no warm air current. Check this fist;
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?
After training on, the heating operation
should start in 5 minutes.
Is the number #40 of Micom (IC04) DC5.0V?
Is the number checking #13 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.
Samsung Electronics
Is STD lamp blinking?
Yes
remote control unit pushed?
No
Yes
change?(Squarewave)
Yes
No
Yes
Yes
Yes
No
Check as in the procedure
"No Power".
Yes
No
Micom (IC04) is faulty.
No
Driver IC06/08 (ULN2003A) is faulty.
Yes
Normal
No
Abnormal Micom
No
Abnormal IC05
No
Abnormal RY73
PCB should be replaced.
Troubleshooting
Normal
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