3. No Remote Control Reception
Check that you are using a [RC-1224] remote control and replace the batteries.
Can a square wave be found?
Point the remote control at the unit and check .
MAIN PCB : [
CP500 : 11pin]
MCU[
U503 : 26pin] RC_IN
Check the cable and its connection.
MAIN PCB : [
CP500] to FRONT PCB : [CP100]
Check the power supply voltage.
MAIN PCB
[
CP500 : 6pin] = +3.3V ± 0.5V, +3.3V_CPU
Does the power supply voltage largely deviate
from 3.3V?
Can a square wave be found?
Point the remote control at the unit and check .
FRONT PCB[
RMC100 : 1pin]
Replace the FRONT PCB[
RMC100].
MCU[
U503 : 26pin] is faulty.
Replace the MCU[
U503].
Or replace the MAIN PCB.
Check that the connection is correct and recon-
nect FFC.
If conduction does not recover, replace the cable
or circuit board.
Check each part listed after "
YES" in "
".
Check the Square wave signal.
FRONT PCB[
Q120]Collector。
No signal: Replace the [
Q120].
NO
NO
NO
NO
NO
YES
YES
YES
YES
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
42