Samsung WALL MOUNTED TYPE Technical Manual page 123

If Operation By Remote Control Unit Is Impossible. (Initial Diagnosis)
1) Troubleshooting procedure
Remove power cord and plug in again approx. 5 Seconds
Is operation lamp blinking?
" " 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)?
Y
N
N
Y
) blinking when
Y
Y
Y
Y
Micom (IC04) is faulty.
N
Check as in the procedure
"NO Power parts".
Y
Normal
Y
Replace battery.
N
LCD is faulty.
N
Replace button.
N
Micom is faulty.
N
Q601(C4375Y) or Q602(C1623Y) is faulty.
IR LED(CL-1L5EU) is faulty.
N
Receiver module is faulty.
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Troubleshooting