27
BDP-120
5
6
7
8
5
6
7
8
A
B
C
D
E
F
The LED power indicator fails to li
g
ht up.
Is the power as specified?
YES
N
O
Check each transistor, LED and the current-limiting resistor.
Is there the "H" potential at pin (4) (LED_STBY) or pin (5)
(LED_PO
N
) of P902?
Is the "H" potential outputted from pin (51) (LED_STBY) or pin
(49) (LED_PO
N
) of IC2503?
Check the connector between SC1201 and P902.
YES
Check the line between IC2503 and P902.
YES
Is the "H" potential applied at the base of Q1202 or Q1203?
YES
POWER FLOW CHART No.1
or POWER FLOW CHART No.3
N
O
N
O
Check IC2503 and its peripheral circuits. Or replace IC2503 as
required.
N
O
Is there the "H" potential at pin (4) (LED_STBY) or pin (5)
(LED_PO
N
) of SC1201?
Check the line between SC1201 and the base of each transistor.
YES
N
O
FLOW CHART No.4
The LED mode display indicator fails to li
g
ht up.
* White LED: Blinkin
g
while the disc is bein
g
loaded.
Li
g
hts up when the disc has been reco
g
nized.
* Blue LED:
While the disc is bein
g
played back.
Is the "H" potential applied at the base of Q1104 or Q1105?
N
O
N
O
Check the line between SC1101 and the base of each transistor.
Is there the "H" potential output from the following pins in each
mode: Pin (52), (LED_MODE) or pin (53) (LED_PLAY),
all on IC2503?
Check IC2503 and its peripheral circuits. Or replace IC2503
as required.
Check the line between IC2503 and C
N
2501.
YES
Is there the "H" potential at pin (5) (LED_MODE) or pin
(4) (LED_PLAY) of SC1101?
YES
Check each transistor, LED and the current-limiting resistor.
YES
N
O
Is there the "H" potential at pin (5) (LED_MODE) or pin (4)
(LED_PLAY) of C
Check the FFC between SC1101 and C
N
2501.
YES
N
O
FLOW CHART No.5
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TEL 13942296513 QQ 376315150 892498299
