Samsung AQ18A9(0)RCF Service Manual page 20

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Troubleshooting (cont'd)
6. When the remote control does not operate
6. When the remote control does not operate
1) Troubleshooting procedure
Remove the power cord and plug it in again approx. five Seconds
The melody sounds from the indoor unit when you
Is voltage of battery less than 2.5V (Remote Control Unit)?
Is LCD display status of the remote control normal?
Does the transmission display lamp blink when you
Is voltage of #30 of remote control of Micom (IC04) changed?
Is voltage at collector of Q601 or Q602 changed?
Is voltage of #26 of Micom (IC04) changed (Indoor unit)?
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Does the STD lamp blink?
YES
push the On/Off button on the remote control.
NO
NO
YES
push the On/Off button on the remote control?
YES
YES
YES
NO
Micom (IC04) is abnormal.
NO
Check as the procedure "No Power"
Refer to page 16
YES
Normal
YES
Replace the battery
NO
LCD is abnormal.
NO
Replace button
NO
Micom is abnormal.
NO
Q601(C4375Y) or Q602(C1623Y)
is abnormal.
IR LED(CL-1L5EU) is abnormal.
YES
Receiver module is abnormal.