Pioneer Elite VSX-81TXV, Service Manual

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VSX-2016AV-S
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1 2 3 4
1 2 3 4
C
D
F
A
B
E
7.1.3 DSP TROUBLESHOOTING
• It is assumed that there is no loose connection or damage in the LCRs.
Simplified diagnosis
Herein is described how to easily diagnose a defective part in the DSP Assy, only with operations of the main unit.
• If the sound is not output when Sound Delay is ON
If the sound is output without a problem when Sound Delay is OFF (0.0 fr) but an abnormality in the sound is detected
when Sound Delay is ON (0.1 to 6.0 fr), it is most likely that SRAM (IC107) or DECODER IC (IC105) in the 1st DSP block
is in failure.
Step 2: Power supply
Step 1: Connections
CN901, CN402, CN951, CN801
Are the
connectors securely
inserted?
Insert the connectors
securely.
No
CN901 (Pins 13,14)
IC301 (Pin 13)
Is the
voltage of digital
power 5.2 V?
No
Digital 5 V input
No
Replace CN901.
Check the power output
of the main unit.
Yes Yes
Is there
any loose connection
at pins 13,14 of
CN901?
No
Replace IC502.
Check the power output
of the main unit.
Yes
Is the
voltage of
IC502-pin 1
5.2 V?
Is the voltage
5.2 V?
No
Yes
A
Yes
CN301, CN952
Are the
FFC securely
inserted?
Insert the FFCs
securely.
No
Yes
To Step 2
Step 0: Preliminary confirmation
Confirm the following items before checking
Do screws
of COAX Jack
securely tighten
?
Tighten screws securely.
No
Yes
Does a XM
antenna pull off?
Pull off a XM antenna.
No
Yes
To Step 1
CN301 (Pin 9)
Is the voltage
5.2 V?
No
Yes
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
IC502 (Pin 5)
XM Load Switch
Is the voltage
5.2 V?
No
Yes
CN501 (Pin 1)
XM Jack
Is the voltage
5.2 V?
No
Yes
Troubleshooting
• : KUXJ and KUXJCA types only