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8-3. Troubleshooting Flowcharts
8-3-1. Power cannot be Turned on (No Operation at All)
<Preliminary checks>
(1) Is the supply voltage normal?
(2) Is the connection to the AC output O.K.?
(3) Are the connection of the primary side and the secondary side of the power transformer inserted into the PC
board?
(4) Is the FUSE (F01) blown?
CN32
CN33
CN06
CN05
Secondary side
Primary side
Transformer PC board (MCC-629)
Main PC board (MCC-639)
Fig. 8-2
Turn the power off for about 5 seconds
and then turn it on again.
Does the OPERATION lamp flash?
Does OPERATION start when you press
the START/STOP button of the remote
control?
Is 220/230/240V AC
supplied to the primary side of the power
source transformer?
Does the transmission
indicator of the remote
control blink normally,
and is the transmission
really performed?
Is 12V AC supplied to the secondary
side of the power transformer?
Remote control
is failure.
Replace
YES
NO
Power transformer
is failure.
Microcomputer is
failure.
Replace the
PC board.
YES
YES
Refer to the below.
Refer to the below.
NO
NO
(Normal)
NO
NO
YES
Probable main
causes
Check items
Remedies
Operations
Item by
symptons
YES
Replace
transformer.
Is the voltage display on the rear panel of
the PC board normal?
(12VDC or 5VDC)
Is the thermal fuse set on ?
YES
Thermal fuse is defective
NO
Replace
NO
YES
Refer to above "Preliminary
checks".
Or there is a defect before
the power transformer.