[8] AUDIO SYSTEM
No
No
No
No
Ye s
Ye s
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 (CN7502) from the main power and peripheral circuit.
Repair the failure points.
Pull out headphone, then check
again.
Replace the speakers or speaker
cables.
Replace the speakers or speaker
cables.
Cancel muting, then check again.
Ye s
Ye s
Raise the volume, then check again.
Is a voltage (+17 V) supplied to
IC8401?
Ye s
No
Is not a signal output from speaker
terminals?
Ye s
Check the IC7961 and peripheral circuit.
Repair the failure points.
Is a 12 V output from +12V_Reg
output of IC7961 normal?
Ye s
Check the peripheral circuits and the communication with the
microcomputer.
If there was no ploblem replace the MAP5601M.
Are signals input to IC8331?
(pins 2, 3, 5, 6)
Ye s
Check the IC8331 and peripheral circuit.
Repair the failure points.
Are signals output from IC8331?
(pins 1, 7)
No
Check between the LPF (L8451, L8452) and speaker terminals.
Repair the failure points.
Is not a PWM signal output from
IC8401?
(pins 34, 38, 46, 50)
Ye s
Ye s
No
Check between the input terminals and IC8201.
Repair the failure points.
Check the peripheral circuits and the communication with the
microcomputer and clock output of X8201.
If there was no ploblem replace the MAP5601M.
Is a signal input to IC8201?
(pins 24, 25)
No
No
Has I2C communication signal
arrived at IC8201?
B
A
Flowchart of Failure Analysis for The Audio System
36 37
38 39
No
Check around the IC8201.
Repair the failure points.
Is not a PWM signal output from
IC8201?
(pins 52, 53, 54, 55)
Ye s
40 41
43 44
42
45
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