Pioneer SX-LX70SW Service Manual page 28

1
QQ
3 7 63 1515 0
A
A
IC101 (B7 (L103), etc.) C902 side 1st DSP 1.2V
No
Check the parts and patterns
Is the voltage
in the path.
1.2 V?
Yes
1.2V Regulator
IC904 (Pins 3,4)
B
No
Is the voltage Check the parts and patterns
in the path.
3.3 V?
Yes
IC904 (Pin 5) 1.2 V REG
No
Is the voltage
1.2 V?
C
Yes
TE
L 13942296513
LATCH1
IC103 (Pin 20)
No
Check the parts and patterns
Is the voltage
in the path.
3.3 V?
Yes
D
IC104 (Pin 20) LATCH1
No
Check the parts and patterns
Is the voltage
in the path.
3.3 V?
Yes
4LINE DECODER(CE)
IC105 (Pin 8)
E
No
Check the parts and patterns
Is the voltage
in the path.
3.3 V?
Yes
IC106 (Pin 37) FLASH ROM
www
No
Check the parts and patterns
Is the voltage
in the path.
3.3 V?
Yes
F
28
1
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2
Is IC904 No
abnormally hot?
Replace IC904.
Yes
The output and GND may be short-
circuited. Check the path between
them.
x ao
y
. i
SX-LX70SW
2
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3
8
IC107 (Pins 9,27) SRAM
No
Is the voltage
3.3 V?
Yes
Logic IC
IC109 (Pin 5)
No
Is the voltage
3.3 V?
Yes
IC551 (Pin 8) OSC Inverter
No
Is the voltage
3.3 V?
Yes
Audio MCK Buffer
IC291 (Pin 14)
Q Q
3 6 7 1 3
No
Is the voltage
3.3 V?
Yes
IC201 Pin 8,etc 1.25 V input
Pin 41,etc 3.3 V input
Is the each
No
voltage
1.25 V, 3.3 V ?
Yes
IC701 (Pins 9, 17) LIPSYNC IC
No
Is the voltage
3.3 V?
Yes
LIPSYNC IC
IC751 (Pins 9, 17)
No
Is the voltage
3.3 V?
Yes
u163
B
.
3
4
2 9 9 4 2 8
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
1 5 0 5 8 2 9 9 4
Check the parts and patterns
in the path.
2nd DSP
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
m
co
4
9 9
2 8 9 9