Pioneer BDP-120 Service Manual page 27

5
QQ
3 7 63 1515 0
FLOW CHART No.4
Is the power as specified?
Is the "H" potential applied at the base of Q1202 or Q1203?
Is there the "H" potential at pin (4) (LED_STBY) or pin (5)
(LED_PON) of SC1201?
Is there the "H" potential at pin (4) (LED_STBY) or pin (5)
(LED_PON) of P902?
Is the "H" potential outputted from pin (51) (LED_STBY) or pin
(49) (LED_PON) of IC2503?
Check IC2503 and its peripheral circuits. Or replace IC2503 as
required.
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FLOW CHART No.5
Is the "H" potential applied at the base of Q1104 or Q1105?
Is there the "H" potential at pin (5) (LED_MODE) or pin
(4) (LED_PLAY) of SC1101?
Is there the "H" potential at pin (5) (LED_MODE) or pin (4)
(LED_PLAY) of CN2501?
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?
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Check IC2503 and its peripheral circuits. Or replace IC2503
as required.
.
5
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6
The LED power indicator fails to light up.
YES
NO
NO
NO
NO
The LED mode display indicator fails to light up.
* White LED: Blinking while the disc is being loaded.
Lights up when the disc has been recognized.
* Blue LED: While the disc is being played back.
NO
NO
NO
NO
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6
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7
2 9
8
NO
POWER FLOW CHART No.1
or POWER FLOW CHART No.3
YES
Check each transistor, LED and the current-limiting resistor.
YES
Check the line between SC1201 and the base of each transistor.
YES
Check the connector between SC1201 and P902.
YES
Check the line between IC2503 and P902.
Q Q
3 6 7 1 3 1 5
YES
Check each transistor, LED and the current-limiting resistor.
YES
Check the line between SC1101 and the base of each transistor.
YES
Check the FFC between SC1101 and CN2501.
YES
Check the line between IC2503 and CN2501.
co
.
BDP-120
7
8
9 4 2 8
0 5 8 2 9 9 4 2 8
m
8
9 9
A
B
C
9 9
D
E
F
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