Pioneer KRP-500P - [6] AUDIO SYSTEM; Flowchart of Failure Analysis for The Audio System

55
KRP-500P
5
6 7 8
5
6 7 8
A
B
C
D
E
F
[6] AUDIO SYSTEM
No
No
Ye s
No
Sound has been emitted from
the speakers.
Ye s
Check the speakers and speaker
cables. Is it no problem?
=> PA1
Is sound muting set?
Is the volume set to 0?
Is not headphone inserted?
No
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.
Ye s
No
No
Is not a signal output from speaker
terminals?
Ye s
Check the IC8341 and peripheral circuit.
Repair the failure points or replace the AUDIO Assy.
No
Is not a PWM signal output from
IC8401?
(pins 34, 38, 46, 50)
Ye s
Flowchart of Failure Analysis for The Audio System
1 2
3 4
Are the CN8301 and CN8302
connectors securely connected?
Securely connect the connectors.
Replace the AUDIO Assy.
No
Is not a PWM signal output from
IC8341?
(pins 40 to 43)
Ye s
5 6
Replace the AUDIO Assy.
Replace the MAIN Assy.
No
Is not a I2S signal output from
IC5001?
(pins 18 to 21)
Ye s
7 8
1 2
5 6
3
7
4
8
JA8551 - pins 1, 2
V: 2 V/div H: 1 mS/div
IC8341 - pins 40, 41
V: 2 V/div H: 5 μS/div
JA8551 - pins 3, 4
V: 2 V/div H: 1 mS/div
IC8341 - pins 42, 43
V: 2 V/div H: 5 μS/div
IC8401 - pins 34, 38
V: 10 V/div H: 5 μS/div
IC5001 - pins 18, 19
V: 2 V/div H: 5 μS/div
IC8401 - pins 46, 50
V: 10 V/div H: 5 μS/div
IC5001 - pins 20, 21
V: 2 V/div H: 200 nS/div
Waveforms
Input signal: L/R 1 kHz, 0.5 Vrms (VOL 30)