VSX-917V-K
104
1
2
3
4
1
2
3
4
C
D
F
A
B
E
• 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 2: BtoB connector and FFC
Step 1: MUTE pin
CN901, CN701, CN951
Are the
connectors securely
inserted?
Turn the power off and
insert the connectors
securely.
No
Replace IC801.
Replace IC402.
Replace IC901.
Replace IC902.
Yes
CN953
Is the
FFC securely
inserted?
Turn the power off and
insert the connectors
securely.
No
Yes
To Step 3
To Step 2
To Step 4
Step 0: Preliminary confirmation
Confirm the following items before checking
Do screws
of COAX Jack
securely tighten
?
Tighten screws securely.
No
Yes
To Step 1
IC801 (Pin 54)
Is the
voltage of output
signal 0 V
?
No
Yes
MUTE
BtoB connector
FFC
Troubleshooting in the XM mode (AWX8809 only)
Step 3: Regulator IC
Check the CN901 and
Regulator assy.
IC901 (Pin 4)
Is the
voltage of around
5 V to 5.3 V
input?
No
Yes
(to chassis)
Check the power
supply path.
IC402 (Pin 1)
Is the
voltage of around
5 V to 5.3 V
output?
No
Is the
voltage of IC402-
pin 5 around 5 V to
5.3 V input?
(to chassis)
IC902 (Pin 5)
Is the
voltage of 1.25 V
output?
No
No
(to chassis)
IC901 (Pin 5)
Is the
voltage of 3.3 V
output?
No
Yes
Yes
Yes
Yes
Yes
Check the path to
the microcomputer.
Is the
voltage of IC402-
pin 4 more than
2.4 V?
No
(to chassis)
Part shape and Pin arrangement
of IC901 and IC902