Pioneer SX-LX70SW Service Manual page 28

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