Pioneer VSX-AX4AVi-S Service Manual page 220

1
1394 Assy Troubleshooting
A • It is assumed that there is no loose connection or damage in the LCRs.
• There must not be an abnormality in pattern.
• The parts marked like
A
Step 1: Connections
A B
,
CN401, CN402
Are the
FFCs correctly
connected?
B
Yes
A B
,
CN401, CN402
Is soldering of
the connectors
OK?
Yes
To Step 2
C
Step 2: Power supply
C
5V input
C419 (+ side)
No
Is the voltage
5V?
Yes
D
Check the INTERFACE Assy .
D
C2 (+ side) 3.3V
No
Is the voltage
3.3V?
Yes
E
E C428 (+ side) 2.5V
No
Is the voltage
2.5V?
Yes
To Step 3
F
220
1
2
are located in the "1394 Assy check points" on page 222.
No
Connect the FFCs
correctly.
No
Solder the connectors
correctly.
Do the
Replace any
No
FFCs work
defective FFC.
correctly?
Yes
Check the soldering of IC1.
If soldering has not been done
correctly, replace IC1.
Check the soldering of IC401.
If soldering has not been done
correctly, replace IC401.
2
3
Step 3: Operation of the Master Clock
F
X101
Is oscillation
of 6.14MHz
output?
Yes
G
X201
Is oscillation
of 24.576MHz
output?
Yes
To Step 4
Step 4: Operation of the Master External I/F
H
JA201
Do signals
(approx. 0.5 Vp-p)
run in all the
lines?
Yes
I
JA202
Do signals
(approx. 0.5 Vp-p)
run in all the
lines?
Yes
To Step 5
VSX-AX4AVi-S
3
4
Microcomputer clock
Check the soldering of X101 or
No
IC101. If soldering has not been
done correctly, replace X101 or
IC101.
Mercury clock
Check the soldering of X201.
No
If soldering has not been done
correctly, replace X201.
Connection 1
Check the soldering of JA201.
No
If soldering has not been done
correctly, replace JA201.
Connection 2
Check the soldering of JA202.
No
If soldering has not been done
correctly, replace JA202.
4