Pioneer SC-LX81 Service Manual page 56

1
A
A
IC701 (Pins 18,38,56,71,86,95,114,128,
11
144,174,189)
Is the No
voltage 1.8V?
Yes
12 IC801(Pin 1) USB Power SW output
B
Is the No
voltage 5V?
Yes
No
C
13 CN801(Pin 1) USB Bus power
Is the No
voltage 5V?
D
Yes
Power supply is OK
To Step 3
E
F
56
1
2
NETWORK Media
processor IC
Check the parts and patterns in
the path.
Is pin4
No
(CTL) of IC801
High?
Yes
Replace IC801.
Is pin15
No
(CTL) of CN1701
High?
Yes
Check the DIGITAL
MOTHER Assy.
Check the parts and
patterns in the path.
Check the parts and patterns in
the path.
2
3
Step 3:Operation of Network Media processor IC
*Please confirm it with the USB memory connected
for the content.
IC701(Pins 203,204)
Does
the crystal
oscillate at
24.576MHz?
Yes
IC861(Pins 46,47)
Does
the crystal
oscillate at
25.000MHz?
Yes
IC701(Pin 81)
Does
81pin output the
oscillation signal
of 25MHz?
No
DM850E doesn't operates correctly.
It seems that there are following problems.
- F/W is not written correctly in FLASH ROM.
- FLASH ROM is NG.
- SDRAM is NG.
Step 4 : Communication between DM850E and
System CPU
The signal shown by following fig are communication
line of DM850E and main CPU(IC2001).
Confirm the connection of the signals along these
routes.
fig. 1
CN901
Pin 12
XRST
SPI CS Pin 21
SPI CLK3 Pin 14
SPI MOSI Pin 18
fig. 2
IC701
SPI MISO Pin 146
SPI REQ3 Pin 100
SC-LX81
3
4
XIN/XOUT
No No
Is XRST high?
Yes
XRST must be high
during operation.
Check the DIGITAL
MOTHR Assy.
Check the parts and patterns
in the path. Replace X701. etc.
XIN/XOUT
No
Chech the power supply voltage
of IC861 again.
PHYCLK
OK, DM850E operates correctly.
No
It can be judged whether DM850E
operates correctly though this
signal is not connected.
IC911 (5V -> 3V)
Pin 12 Pin 11 Pin 190
Pin 2 Pin 3 Pin 143
Pin 5 Pin 6
Pin 9 Pin 8 Pin 147
IC921 (3V -> 5V)
Pin 9 Pin 8
Pin 5 Pin 6
4
IC701
Pin 141
CN901
Pin 19
Pin 20