Pioneer SC-37 Service Manual page 38

1
QQ
DSP&AUDIO Troubleshooting
3 7 63 1515 0
Any type of signals have no sound, follow Step 1 to Step 3
Only spesific type of signal has no sound, follow an appropriate trobleshooting to the symptom.
A
The confirmation of peripheral circuits in the flowchart means the checking of the power supply directly at the pin of the IC,
the conduction and resistance value check, and the checking of the solder.
The confirmation of the pattern in the flowchart means the diagnosis including the one for the resistors on the pattern.
During the diagnosis, pay attention to the switching of output from 2ch to Multi ch by the listening mode of IC9003.
Step 1: DSP/AUDIO
Step 1-1: POWER SUPPLY for 1st DSP
IC9811 (Pins 1,2)
B
Is the
No
voltage of around
3.3 V or 5.6 V
?
(Pin 1: 3.3 V)
(Pin 2: 5.6 V)
Yes
IC9811 (Pin 4)
Is the
No
voltage of around
3.3 V?
C
Yes
IC9806 (Pins 1,4)
TE
L 13942296513
Is the
No
voltage of around
3.3 V or 1.8 V
?
(Pin 1: 3.3 V)
(Pin 4: 1.8 V)
Yes
IC9806 (Pin 5)
D
Is the
No
voltage of around
1 V?
Yes
IC9008 (Pin 1)
Is the
No
voltage of around
5.6 V?
Yes
E
IC9008 (Pin 3)
Is the
No
voltage of around
5 V?
Yes
www
IC9008 (Pin 5)
F
38
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2
DIRPOW,V+5R6_EV
Check the patterns between
IC9811 and IC604.
Check the patterns between
IC9811 and CN9801.
V+3R3_D
Check the IC9811 and its
peripheral circuits.
DIRPOW
Check the patterns between
IC9806 and IC604.
V+1_DDF
Check the IC9806 and its
peripheral circuits.
V+5R6_DDD
Diagnose the PRIMARY Assy.
DVCPOW
Diagnose the DISPLAY Assy.
V+3R3_OS
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y
. i
2
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3
8
Is the
voltage of around
3.3 V?
Yes
To Step 1-2
(SC-37,SC-LX83)
Step 1-2: Power Supply for 2nd DSP
IC9816 (Pins 1,4)
Is the
voltage of around
3.3 V or 1.8 V
?
Q Q
3 6 7 1 3
(Pin 1: 3.3 V)
(Pin 4: 1.8 V)
Yes
IC9816 (Pin 5)
Is the
voltage of around
1.2 V?
Yes
To Step 1-3
u163
.
SC-37
3
4
2 9 9 4 2 8
No
Replace IC9008.
To Step 1-3
(SC-35,SC-LX73)
DIRPOW,V+1R8_DSP
No
Check the patterns between
IC9816 and IC604.
Check the patterns between
1 5 0 5 8 2 9 9 4
IC9816 and C9845.
V+1R2_DSP2
No
Check the IC9816 and its
Peripheral circuits.
SC-37,SC-LX83 only
m
co
4
9 9
2 8 9 9