Samsung Electronics - Samsung MC26AC2-07 Service Manual

5-2-8 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)?

Samsung Electronics

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 5-2.
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.
NO
Receiver module is faulty.
Troubleshooting
5-9