Diagnosis; Diagnosis Flowchart - Pioneer BDP-120 Service Manual

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5. DIAGNOSIS

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5.1 DIAGNOSIS FLOWCHART

[1] MAIN PWB Unit
A
FLOW CHART No.1
The power does not become ON.
YES
The power becomes OFF.
YES
B
Is the fan turning on when the power
is turned ON?
YES
Check the fan, fan power and their
peripheral circuits.
Are AT_12V,SUB_PC-8V supplied to
SC9001?
C
Is 1.05V supplied to TL9016 3.3V to
TL9017, 1.8V to TL 9018 respectively?
TE
L 13942296513
Is 27MHz detected at R7260?
Does pin (1) of CN7205 turn to High and
Low on start-up?
D
Check IC7802, IC7803, IC7804, IC7805,
IC8502, IC8505 and their peripheral
circuits.
FLOW CHART No.2
Are 12V and 5V supplied to the drive?
E
Are DRIVE 3.3v to IC7201?
Are DRIVE 1.5V to IC7201?
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Check the drive.
F
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2
The main PWB circuit doesn't function when the power is turned ON.
NO
NO
YES
YES
YES
YES
The drive doesn't function normally.
YES
YES
YES
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3
8
NO
Is the level of pin (6) of SC9001 at Low?
YES
Check the peripheral circuits
of IC2503.
NO
Check the POWER PWB Unit.
NO
Check the IC9001, 9002, 9003 and their
peripheral circuits.
Q Q
3 6 7 1 3
NO
Check X7201 and its peripheral circuits.
NO
Check IC7201 and its peripheral circuits.
NO
Check DRIVE_12V of Q9014, DRIVE_5V of Q9012 and their
peripheral circuits.
NO
Check IC9006 and its peripheral circuits.
NO
Check IC9005 and its periphral circuits.
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BDP-120
3
4
2 9 9 4 2 8
NO
Check the
IC9001, 9002, 9003, and their
peripheral circuits.
1 5 0 5 8 2 9 9 4
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4
9 9
2 8 9 9