Diagnosis; Diagnosis Flowchart - Pioneer VSX-1018AH-K Service Manual

1

5. DIAGNOSIS

5.1 DIAGNOSIS FLOWCHART

A
[1] DSP Troubleshooting
Simplified diagnosis
Errors in DSP Assembly (Areas simply and roughly predictable by machine operation only)
• Sound abnormality in Delay
If sound abnormality does not occur in the Delay OFF state but occurs in the Delay ON state, it is most likely
that a failure has occurred in SDRAM (IC301) or LATCH (IC303, IC304) in the 1st DSP Block.
• No sound at analog signal input
If sound abnormality does not occur with a digital signal input (COAX, OPT) but occurs only with an analog signal input,
it is most likely that a failure has occurred in the AD converter (IC591).
Troubleshooting
B
Step 0: Preliminary confirmation
Confirm the following items before checking
Do screws
of COAX Jack
securely tighten
?
Yes
To Step 1
C
Step 1: MUTE pin
IC401 (Pin 84)
Is the
voltage of output
signal 0 V
?
Yes
D
To Step 2
Step 2: BtoB connector and FFC
CN702, CN703, CN704, CN801
Are the
connectors securely
inserted?
Yes
E
CN601
Is the
FFC securely
inserted?
Yes
To Step 3
F
28
1
2
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.
VSX-LX51
2
3
Step 3: Regulator IC
IC704 (Pins 7,8)
(to chassis)
Is the
No
Check the IC704 and
voltage of around
5 V to 5.3 V
REGULATOR Assy.
input?
Yes
L705, L704 (stby side)
Is the
No
voltage of 1 V Replace IC704.
output?
Yes
IC705 (Pin 4)
(to chassis)
Is the
No
voltage of around
Check the IC705.
5 V to 5.3 V
output?
Yes
IC705 (Pin 5)
(to chassis)
Is the
No
voltage of 3.3 V Replace IC705.
output?
Yes
Q601 (Pin 4)
(to chassis)
Is the
No
Check the Q601 and
voltage of 5 V
REGULATOR Assy.
input?
Yes
Q601 (Pins 1, 2, 5, 6)
(to chassis)
Is the
No
Replace Q601 and Q561.
voltage of 5 V
output?
Yes
To Step 4
3
4
Part shape and Pin arrangement
of IC705
4