Pioneer VSX-03TXH Service Manual page 36

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QQ
3 7 63 1515 0
A
[2] DSP Troubleshooting in the XM mode
Step 0: Preliminary confirmation
Confirm the following items before checking
Do screws
of COAX Jack
securely tighten
?
Yes
To Step 1
B
Step 1: MUTE pin
IC401 (Pin 84)
Is the
voltage of output
signal 0 V
?
C Yes
To Step 2
TE
L 13942296513
Step 2: BtoB connector and FFC
CN701, CN703, CN704, CN801
Are the
connectors securely
inserted?
D
Yes
CN601
Is the
FFC securely
inserted?
Yes
To Step 3
E
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F
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No
Tighten screws securely.
Note:
If this section is not fixed,
the GND for DSP module
may lifted from the chassis
and cause instable potential
and lead to product failures.
DS0MUT3
No
Replace IC401.
BtoB connector
No
Turn the power off and
insert the connectors
securely.
FFC
No
Turn the power off and
insert the connectors
securely.
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8
Step 3: Regulator IC
IC704 (Pins 7,8)
Is the
voltage of around
5 V to 5.3 V
input?
Yes
L705, L704 (stby side)
Is the
voltage of 1 V
output?
Yes
IC705 (Pin 4)
Is the
voltage of around
5 V to 5.3 V
input?
Yes
IC705 (Pin 5)
Q Q
3 6 7
Is the
voltage of 3.3 V
output?
Yes
IC102 (Pin 1)
Is the
voltage of around
5 V to 5.3 V
output?
Yes
A
u163
VSX-03TXH
3
4
2 9 9 4
(to chassis)
No
Check the IC704 and
REGULATOR Assy.
No
Replace IC704.
(to chassis)
No
Check the IC705.
(to chassis)
1 3 1 5 0 5 8 2 9
No
Replace IC705.
(to chassis)
Is the
No
voltage Pin 5
of IC102 around 5 V
to 5.3 V input?
Check the power
Yes
supply line.
Is the
voltage Pin 4 of
IC102 at 2.4 V
or more?
Check the path
Yes
between Pin 4
of IC102 and
microcomputer.
Replace IC102.
m
co
.
4
2 8
9 9
9 4 2 8 9 9
No
No