Samsung AQ12AAMC Service Manual page 13

3-2-6 If Operation By Remote Control Unit Is Impossible. (Initial Diagnosis)
1) Troubleshooting procedure
Remove power cord and plug in again approx. 5 Seconds
" " sound heard from the indoor unit when ON/OFF
button on the remote control unit pushed?
Voltage of battery less than 2.5V (Remote Control Unit)?
LCD display status of REMOCON normal?
Transmission display lamp (
ON/OFF button on the remote control unit pushed?
Voltage at PIN #30 of Remocon Micom change?
Voltage at collecter of Q601 or Q602 change?
Voltage at pin #26 of micom (IC04) change (INDOOR UNIT)?
12
Is operation lamp blinking?
YES
NO
NO
YES
) blinking when
YES
YES
YES
YES
Micom (IC04) is faulty.
NO
Check as in the procedure "NO Power
parts". Refer to page 8.
YES
Normal
YES
Replace battery.
NO
LCD is faulty.
NO
Replace button.
NO
Micom is faulty.
NO
Q601(C4375Y) or Q602(C1623Y) is faulty.
IR LED(CL-1L5EU) is faulty.
Receiver module is faulty.