Pioneer VSX-94TXH Service Manual page 63

5
QQ
A
3 7 63 1515 0
IC701 (Pins 18,38,56,71,86,95,114,128,
11
144,174,189)
Is the
voltage 1.8V?
Yes
12 IC801(Pin 1)
Is the
voltage 5V?
Yes
TE
L 13942296513
13 CN801(Pin 1)
Is the
voltage 5V?
Yes
Power supply is OK
To Step 3
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NETWORK Media
processor IC
No
Check the parts and patterns in
the path.
USB Power SW output
Is pin4
No No
(CTL) of IC801
High?
Yes
Replace IC801.
Is pin20
No No
(CTL) of CN901
High?
Yes Check the
MAIN Assy.
Check the parts and
patterns in the path.
USB Bus power
No
Check the parts and patterns in
the path.
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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)
Q Q
Does
3 6 7 1 3 1 5
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(IC101).
Confirm the connection of the signals along these
routes.
fig. 1
CN901
XRST Pin 1
SPI CS Pin 10
SPI CLK Pin 3
SPI TX Pin 8
fig. 2
IC701
SPI RX Pin 146
SPI REQ Pin 100
co
.
VSX-94TXH
7
8
9 4 2 8
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.
0 5 8 2 9 9 4 2 8
No
It can be judged whether DM850E
operates correctly though this
signal is not connected.
IC911 (5V→3V)
IC701
Pin 12 Pin 11 Pin 190
Pin 2 Pin 3 Pin 143
Pin 5 Pin 6 Pin 141
Pin 9 Pin 8 Pin 147
IC921 (3V→5V)
CN901
m
Pin 9 Pin 8 Pin 7
Pin 5 Pin 6 Pin 9
9 9
A
B
C
9 9
D
E
F
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