TROUBLE SHOOTING
1. The power cannot be turned on (Power indicator LED is not lit)
2. The power cannot be turned on (Power indicator LED lights flashes)
AC PCB
Check insertion of the connector.
POWER SW PCB
Check insertion of the connector.
DIGITAL PCB
Check insertion of the connector.
Check that voltage is supplied to the STANDBY
TRANS [T101] coil.
Check that voltage is supplied to the [D8508 :
cathode]
Check that voltage is supplied to [N631 : 5pin]
Check that voltage is supplied to [C101]
Check that voltage is supplied to the [Q105 : col-
lector]
Check that voltage is supplied to [U103 : 4pin]
Malfunction of [U102].
Broken wire in STANDBY TRANS [T101]
Malfunction of [D101 - D104].
Malfunction of [U8501].
Malfunction of [D105, D106].
Malfunction of [Q102, Q105].
Malfunction of [U103].
NG
NG
NG
NG
NG
NG
Check insertion of each connector.
Check that voltage is supplied to [F101]
Check that voltage is supplied to the MAIN TRANS
coil
Check that the voltage of 16V
PROT is active. [N1410 : 13pin]
Check that the voltage of M_B_
DOWN is active. [Q104 : Collec-
tor]
Check that voltage is supplied
to the [C5107, C5108]
Blown MAIN TRANS
Blown fuse
Malfunction of [D5100].
Malfunction of [D1201, D1202].
Malfunction of [D8509, D8510,
D8523, D8522].
Malfunction of [D8511, 8512].
Malfunction of [U8503].
Check that voltage is supplied to
the [D1201 : Cathode]. (C1201)
Check that voltage is supplied
to the [D8509 : cathode]. (C8516)
Check that voltage is supplied
to [C8519]
Check that voltage is supplied to
[N1011 : 10pin] (U8503 output)
Hi → Lo
Hi → Lo
Active
Active
YES
YES
YES
Hi
Hi
NG
NG
NG
NG
NG
NG
NG
YES
YES
YES
YES
YES
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44
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
