Is the power supply voltage (FST+3.3V) of the
remote control sensor [U4001] on the FRONT
PCB normal?
• [FCC300 1pin, 2pin] (ST+3.3V)
When a button is pressed on the remote control,
is the remote control waveform (pulse wave-
form) output from the remote control sensor
[U4001] on the FRONT PCB?
• [FCC300 17pin] (REMO)
Check the condition of the remote control light reception circuit parts and solder; replace any faulty
parts.
Check the input voltage of [U3904] on the
POWER PCB, as well as the circuits and solder of
any circuits that carry this output load.
Replace [U3904] if there are no abnormalities.
Check the condition of the pins and solder of the
remote control sensor [U4001] on the FRONT
PCB.
Replace the remote control sensor if there are
any abnormalities.
2.2. FLD control waveform
2.3. Remote control signals are not being received.
VDD
DIS_CD
DIS_SCL(CP)
DIS_SO(DA)
W1
W2
W3
W4
NO
NO
YES
YES
33
Caution in
servicing
Electrical Mechanical Repair Information Updating
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