Samsung MC18AC2-09 Service Manual page 30

5-2-4 When the UP/DOWN Louver Moter 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 remote control
unit pushed?
Voltage at pin #58 ~ #61 of micom (ICO4) change?(Squarewave)
Volatge at pin #13 ~ #16 of IC06 (ULN2003AFW)
5-2-5 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 (ULN2003AFW) LOW?
RY01 or Cable Check.
Samsung Electronics
Is STD lamp blinking?
YES
NO
YES
change?(Squarewave)
YES
UP/DOWN louver motor is faulty.
NO
YES
NO
Check as in the procedure "No Power
parts". Refer to page 5-2.
YES
NO
Micom (IC04) is faulty.
NO
Driver IC06 (ULN2003AFW) is faulty.
YES
Normal
NO
Abnormal Micom
NO
Abnormal IC06
Troubleshooting
Normal
PCB should be replaced.
5-5