Audio System - Pioneer PDP-5020FD Service Manual

1
A

[8] AUDIO SYSTEM

Flowchart of Failure Analysis for The Audio System
=> AU1
Has the sound been emitted from
the speakers?
Yes
B
C
D
Has the sound been emitted from
E
the Audio out terminal?
Yes
F
B
68
1
2
No
Is sound muting set?
No
Is the volume set to 0?
No
Is not headphone inserted?
Yes
Sound of all functions does not
output?
Yes
Check the speakers and speaker
cables. Is it no problem?
Yes
Is not a signal output from speaker
terminals?
36 37
Yes
Is a voltage (+17 V) supplied to
IC8401?
Yes
Is not a PWM signal output from
IC8401?
(pins 34, 38, 46, 50)
38 39
Yes
Is not a PWM signal output from
IC8201?
(pins 52, 53, 54, 55)
40 41
Yes
Is a signal input to IC8201?
(pins 24, 25)
Yes
Has I2C communication signal
arrived at IC8201?
No
Is a 12 V output from +12V_Reg
output of IC7961 normal?
Yes
Are signals input to IC8331?
(pins 2, 3, 5, 6)
43 44
Yes
Are signals output from IC8331?
(pins 1, 7)
PDP-5020FD
2
3
Yes
Cancel muting, then check again.
Yes
Raise the volume, then check again.
No
Pull out headphone, then check
again.
No
A
Go to .
No
Replace the speakers or speaker
cables.
No
Replace the speakers or speaker
cables.
No
Check the cables (CN7502) from the main power and peripheral circuit.
Repair the failure points.
No Check between the LPF (L8451, L8452) and speaker terminals.
Repair the failure points.
No
Check around the IC8201.
Repair the failure points.
No
Check between the input terminals and IC8201.
Repair the failure points.
42
No Check the peripheral circuits and the communication with the
microcomputer and clock output of X8201.
If there was no ploblem replace the MAP5601M.
Check the IC7961 and peripheral circuit.
Repair the failure points.
Check the peripheral circuits and the communication with the
microcomputer.
If there was no ploblem replace the MAP5601M.
Check the IC8331 and peripheral circuit.
Repair the failure points.
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