Pioneer VSX-1017AV-K Service Manual page 37

5
Troubleshooting in the XM mode (AWX8805 only)
• When a sound is not output in the XM antenna input. (SurroundBack is not output by setting.)
• Suppose CR to be poor contact and that is not damaged.
• This shows failure analysis of DSP Assy.
Step 0: Preliminary confirmation
Confirm the following items before checking
Do screws
of COAX Jack
securely tighten
?
Yes
To Step 1
Step 1: MUTE pin
IC801 (Pin 54)
Is the
voltage of output
signal 0 V
?
Yes
To Step 2
Step 2: BtoB connector and FFC
CN901, CN701, CN952
Are the
connectors securely
inserted?
Yes
CN953 FFC
Is the
FFC securely
inserted?
Yes
To Step 3
5
6
No
Tighten screws securely.
MUTE
No
Replace IC801.
BtoB connector
No
Turn the power off and
insert the connectors
securely.
No
Turn the power off and
insert the connectors
securely.
VSX-1017AV-K
6
7
Step 3: Regulator IC
IC901 (Pin 4)
(to chassis)
Is the
No
Check the CN901 and
voltage of around
5 V to 5.3 V
Regulator assy.
input?
Yes
IC901 (Pin 5)
(to chassis)
Is the
No
voltage of 3.3 V
Replace IC901.
output?
Yes
IC902 (Pin 5)
(to chassis)
Is the
No
Replace IC902.
voltage of 1.25 V
output?
Yes
IC402 (Pin 1)
(to chassis)
Is the
No
voltage of around
5 V to 5.3 V
output?
Yes
To Step 4
Part shape and Pin arrangement
of IC901 and IC902
7
8
Is the
voltage of IC402-
No
pin 5 around 5 V to
5.3 V input?
Check the power
supply path.
Yes
Is the
No
voltage of IC402-
pin 4 more than
2.4 V?
Check the path to
Yes
the microcomputer.
Replace IC402.
8
A
B
C
D
E
F
37