Pioneer SX-LX70SW Service Manual page 29

5
B
DAMP ASSY
IC3101 (Pin 15, etc.) MODULATOR
No
Check the parts and patterns
Is the voltage
in the path.
3.3 V?
Yes
IC3191 (Pin 8) P.CONFIG
No
Check the parts and patterns
Is the voltage
in the path.
30.5 V?
Yes
IC3201-3501 (Pin 1, etc.) POWER STAGE VG
No
Check the parts and patterns
Is the voltage
in the path.
12 V?
Yes
IC3201-3501 (Pin 21, etc.) POWER STAGE PVDD
No
Check the parts and patterns
Is the voltage
in the path.
30.5 V?
Yes
To Step 3
5
6
Step 3: Operating Master Clock
IC101 B4 (R138)
Is there
an operating master
clock signal
(24.576 MHz)?
IC201 (Pin 45)
Is there
an operating master
clock signal
(24.576 MHz)?
IC301 (Pin 30)
Is there
an operating master
clock signal
(24.576 MHz)?
To Step 4
SX-LX70SW
6
7
OSC1
Is there
No
an operating master
clock signal(24.576 MHz)
at IC552-pin 4?
Yes
Yes
Check the parts and
patterns in the path.
Is there
an operating master
clock signal(24.576 MHz)
at IC551-pin 2?
Yes
Replace IC552.
OSC2
Is there
No
an operating master
clock signal(24.576 MHz)
at IC551-pin 5?
Yes
Yes
Check the parts and
patterns in the path.
OSC3
Is there
No
an operating master
clock signal(24.576 MHz)
at IC551-pin 7?
Yes
Yes
Check the parts and
patterns in the path.
7
8
A
No
B
No
Replace IC551
or X551.
C
No
Replace IC551.
D
No
Replace IC551.
E
F
29
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