Samsung UQ18A0RCD, Service Manual, Page: 12 / 33

11
3-2-4 When the UP/DOWN Louver Motor Does Not Operate. (Initial Diagnosis)
1) Checklist :
(1) Is input voltage normal? (rating voltage ±10% range)
(2) Is the UP/DOWN louver motor properly connected with the connector (CN61)?
2) Troubleshooting procedure
Y
Y
N
N
Y
N
N
Y
Remove power cord and plug in again in approx. 5 seconds.
Is operating lamp blinking?
Does operation start when swing button of the remote
control unit pushed?
Voltage at pin #1-#4 of micom (ICO4) change?(Squarewave)
Volatge at pin #15, #16 of IC06 (KID65003), #10, All of IC05
change?(Squarewave)
UP/DOWN louver motor is faulty.
Driver IC05 (KID65003) or IC06 is faulty.
Micom (IC04) is faulty.
Normal
Check as in the procedure "No Power
parts". Refer to page 8.
3-2-5 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 CN78 connector?
After training on, the heating operation should
start in five minutes.
Is the mumber #7 of Micom (IC04) DC 4.8 V?
Is the mumber #12 of IC06 (KID65003) LOW?
Is the voltage between CN71 #5 and CN78 #1 the 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
YES
YES
NO
NO NO
NO
YES
YES
YES
Normal
Abnormal Micom
Abnormal IC07
Abnormal RY73
Refer to replace PCB module
DB81-00188A(4)-1** 10/30/02 10:44 AM Page 11