Samsung MC26AC2X Service Manual download pdf (Page 34)

5-9Samsung Electronics

Troubleshooting

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

Is operation lamp blinking?

Check as in the procedure “NO Power parts”.

Refer to page 5-2.

Normal

Replace battery.

LCD is faulty.

Replace button.

Micom is faulty.

Receiver module is faulty.

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

IR LED(CL-1L5EU) is faulty.

“ “ 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?

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)?

Micom (IC04) is faulty.

Transmission display lamp ( ) blinking when

ON/OFF button on the remote control unit pushed?

YES

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Samsung MC26AC2X Service Manual Page 34