Samsung AM27B1C07 Service Manual page 12

3-2-4 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. 5 seconds.
Is STD lamp blinking?
Does operation start when swing button of the remote
control unit pushed?
Voltage at pin #58-#61 of micom (ICO4)
change?(Squarewave)
Volatge at pin #13 ~ #16 of IC06 (ULN2003A)
change?(Squarewave)
UP/DOWN louver motor is faulty.
3-2-5 In the mode, when there is no cool air current. Check this first;
(1) Is the set temperature of Remote Control lower than room temperature in Cool mode?
(2) Is the Indoor PCB properly connected with the CN71 connector?
After training on, the Cooling operation should
start in five minutes.
Is the number #33 of Micom (IC04) DC 5.0 V?
Is the number checking #10 of IC06 (ULN2003A) LOW?
RY7I or Cable Check.
YES
YES
YES
NO
NO
YES
NO
YES
NO
YES
YES
Check as in the procedure "No Power
parts". Refer to page 8.
Normal
Micom (IC04) is faulty.
Driver IC06 (ULN2003A) is faulty.
YES
Normal
NO
Abnormal Micom
NO
Abnormal IC06
PCB should be replaced.
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