– 29 –
Primary side
Secondary side
CN32
CN33
CN01
CN12
Transformer P.C. board (MCC-629)
Main P.C. board (MCC-1293)
Operations
NO
YES
12V DC, 5V DC power supply circuit failure
(DB01, C01, Q03, D01, Q01, Q02, lC03)
Does operation start
when you push the ON/OFF button
of the remote control?
Turn the power off for about 5
seconds and then turn it on again.
Does the OPERATION
lamp flash?
Is 50Hz 220–240V AC
supplied to the primary side of
the power source transformer?
Is 12V AC supplied
to the secondary side
of the power transformer?
Does the transmission indicator of the
remote control flash normally, and is
the transmission really performed?
(Normal)
Is the lead wire disconnected from
the infrared rays receive parts?
Remote
control
failure
Connect the
wire properly
Infrared rays receive parts
or P.C. board failure
Power
transformer
is failure
Microcomputer
is failure
Refer to the figure below.
Refer to the figure below.
Replace
Item by
symptoms
Remedies
Probable
main causes
Check items
Is the voltage display on the rear
panel of the P.C. board normal?
(12V DC or 5V DC)
Replace
Replace
transformer
Replace the
P.C. board
Replace the
P.C. board
Refer to above “Preliminary checks”.
Or there is a defect before the power transformer.
YES
NO
NO
YES
NO
YES
YES
NO
NO
YES
YES
NO
9-3. Troubleshooting Flowcharts
9-3-1. 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 OK?
(3) Are the connection of the primary side and the secondary
side of the power transformer inserted into the P.C. board?
(4) Is the FUSE (F01) blown?
Fig. 9-3-1 Power transformer connection diagram
