Samsung MH026FPEA Training Manual page 101

Troubleshooting
8-3-7 If Operation by remote control unit is impossible. (Initial Diagnosis)
1. Troubleshooting procedure
Remove power cord and plug in again in 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 REMOTE CONTROL normal?
Transmission display lamp (
ON/OFF button on the remote control unit pushed?
Voltage at pin #30 of Remote control Micom change?
Voltage at collector of Q601 or Q602 change?
Voltage at pin #15 of micom (IC04) change (INDOOR UNIT)?
100
Is the operation icon( ) lamp
flickering with the sound of "ting"?
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 96.
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.
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