Samsung AD18B1C09, UD26B1C2, UD18B1C2, AD26B1C13 service manual 1Troubleshooting procedure

3-3-7 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?

YES

“ “ sound heard from the indoor unit when ON/OFF button on the remote control unit pushed?

NO

Voltage of battery less than 2.5V (Remote Control Unit)?

NO

LCD display status of REMOCON normal?

YES
Transmission display lamp (	) blinking when

ON/OFF button on the remote control unit pushed?

YES

Voltage at PIN #30 of Remocon Micom change?

YES

Voltage at collecter of Q601 or Q602 change?

YES

Voltage at pin #26 of micom (IC04) change (INDOOR UNIT)?

YES

NO

YES

YES

NO

NO

NO

NO

NO

Check as in the procedure “NO Power parts”.

Refer to page 11.

Normal

Replace battery.

LCD is faulty.

Replace button.

Micom is faulty.

Q601(C4375Y) or Q602(C1623Y) is faulty.

IR LED(CL-1L5EU) is faulty.

Receiver module is faulty.

Micom (IC04) is faulty.

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