Samsung AQA07C5(6)ME, Service Manual

Page: 30 / 60

Troubleshooting
5-5 Samsung Electronics
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.
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 ULN2003AFW)
change?(Squarewave)
UP/DOWN louver motor is faulty.
Driver IC06 (ULN2003AFW) is faulty.
Micom (IC04) is faulty.
Normal
Check as in the procedure "No Power
parts". Refer to page 5-2.
5-2-5 In the 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?
After training on, the heating operation should
start in five minutes.
Is the number #36 of Micom (IC04) DC 5.0 V?
Is the number checking #12 of IC06 (ULN2003AFW) LOW?
Is the voltage between CN71 #3 and CN71 #5 rating voltage ±10% range
Abnormal 4way 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 IC06
Abnormal RY73
PCB should be replaced.
YES
YES
NO
NO
YES
NO
NO
YES
DB98-04444A(1)-1 4/9/02 2:19 PM Page 5-5