56
SC-LX81
1
2
3
4
A
B
C
D
E
F
1
2
3
4
IC
8
01(Pin 1)
USB Power S
W
output
12
N
o
N
o
Yes
Is the
voltage 5
V
?
Check the parts and patterns in
the path.
C
N8
01(Pin 1)
USB Bus power
13
N
o
Is the
voltage 5
V
?
Yes
Power supply is OK
To Step 3
Yes
DM
8
50E doesn't operates correctly.
It seems that there are following problems.
- F/
W
is not written correctly in FLASH ROM.
- FLASH ROM is
N
G.
- SDRAM is
N
G.
Chech the power supply voltage
of IC
8
61 again.
IC
8
61(Pins 46,47)
IC701(Pins 203,204)
XI
N
/XOUT
IC701(Pin
8
1)
PHYCLK
N
o
Yes
OK, DM
8
50E operates correctly.
It can be judged whether DM
8
50E
operates correctly though this
signal is not connected.
N
o
N
o
XI
N
/XOUT
N
o
N
o
Yes
XRST must be high
during operation.
Check the DIGITAL
MOTHR Assy.
Yes
Is XRST high?
Check the parts and patterns
in the path. Replace X701. etc.
N
o
Check the DIGITAL
MOTHER Assy.
Replace IC
8
01.
Yes
N
o
Is pin4
(CTL) of IC
8
01
High?
Check the parts and
patterns in the path.
Yes
Is pin15
(CTL) of C
N
1701
High?
A
Check the parts and patterns in
the path.
IC701 (Pins 1
8
,3
8
,56,71,
8
6,95,114,12
8
,
144,174,1
8
9)
N
ET
W
ORK Media
processor IC
11
N
o
Is the
voltage 1.
8V
?
Step 3:Operation of Network Media processor IC
*Please confirm it with the USB memory connected
for the content.
Step 4 : Communication between DM
8
50E and
System
CPU
The signal shown by following fig are communication
line of DM
8
50E and main CPU(IC2001).
Confirm the connection of the signals along these
routes.
Does
the crystal
oscillate at
24.576MHz?
Does
the crystal
oscillate at
25.000MHz?
Does
8
1pin output the
oscillation signal
of 25MHz?
fig. 1
C
N
901
IC701
XRST
Pin 12
Pin 12
Pin 11
Pin 190
SPI CS
Pin 21
Pin 2
Pin 3
Pin 143
SPI CLK3
Pin 14
Pin 5
Pin 6
Pin 141
SPI MOSI
Pin 1
8
Pin 9
Pin
8
Pin 147
fig. 2
IC701
C
N
901
SPI MISO
Pin 146
Pin 9
Pin
8
Pin 19
SPI REQ3
Pin 100
Pin 5
Pin 6
Pin 20
IC911 (5
V
-> 3
V
)
IC921 (3
V
-> 5
V
)
