PDP-508XG
27
5678
56
7
8
C
D
F
A
B
E
4.2.2 AUDIO SYSTEM
Ye s
No
No
No
Ye s
Ye s
No
No
Has the sound been emitted from
the speakers?
Ye s
Has the sound been emitted from
the Audio out terminal?
Sound of all functions does not
output?
Ye s
Ye s
Check the speakers and speaker
cables. Is it no problem?
=> AU1
Is sound muting set?
Is the volume set to 0?
Is not headphone inserted?
Go to .
No
No
Check the cables (CN8806) from the main power and peripheral circuit.
Repair the failure points.
Pull out headphone, then check
again.
Replace the speakers or speaker
cables.
Cancel muting, then check again.
Ye s
Raise the volume, then check again.
Is a voltage (+16.5 V) supplied to
IC9201?
Ye s
No
Check the CN9251 and peripheral circuit.
Repair the failure points.
Is not a signal output from
CN9251? (pins 2, 4, 5, 7)
Ye s
Check the IC9181 and peripheral circuit.
Repair the failure points.
Is a 12 V output from +12V_Reg
output of IC9181 normal?
Ye s
Check the peripheral circuits and the communication with the
microcomputer. If there was no ploblem replace the MSP5651M.
Are signals input to IC9151?
(pins 2, 3, 5, 6)
Ye s
Check the IC9151 and peripheral circuit.
Repair the failure points.
Are signals output from IC9151?
(pins 1, 7)
No
Check between the LPF (L9255, L9256) and CN9251.
Repair the failure points.
Is not a PWM signal output from
IC9201?
(pins 34, 38, 46, 50)
Ye s
Ye s
No
Check between the input terminals and IC9101.
Repair the failure points.
Check the peripheral circuits, the communication with the microcomputer
and X9101 clock output. If there was no ploblem replace the MSP5651M.
Is a signal input to IC9101?
(pins 24, 25)
No
No
Has I2C communication signal
arrived at IC9101?
B
A
Flowchart of Failure Analysis for The Audio System
42 43
44 45
No
Check the IC9101 and peripheral circuit.
Repair the failure points.
Is not a PWM signal output from
IC9101?
(pins 52, 53, 54, 55)
Ye s
46 47
49 50
48
51
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