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5. DIAGNOSIS
5.1 DIAGNOSIS FLOWCHART
A
[1] DSP Troubleshooting
(1) Simplified diagnosis
Errors in the DSP Block of the DSP Assy (those simply and roughly predictable by machine operation only)
• Has DSP block caused the malfunction?
Inputting a 2 ch PCM (such as CD) digital signal, check if the sound plays by switching AUTO SURR / STREAM DIRECT.
When the sound doesn't play in AUTO SURROUND or DIRECT MODE though it does in PURE DIRECT (PCM DIRECT)
MODE, DSP block might be defective.
(2) Troubleshooting
B
• Assume that the LCRs are neither in poor connection nor damaged.
• This shows failure analysis for the DSP Block of the DSP Assy.
• The parts marked like
Step 1: Connections
CN2001,CN2002,CN2003,
CN2602,CN2901,CN2902
Are the
connectors securely
inserted?
C
Yes
CN2601
Is the
FFC securely
inserted?
Yes
CN2201
D
Is the
connector securely
inserted?
Yes
To Step 2
E
F
36
1
2
A
in the following chart are located in "Check Points of the DSP Assy."
Connection with
the INTERFACE Assy.
No
Insert the connectors
securely.
Connection with
the DIGITAL MAIN Assy.
No
Insert the FFC
securely.
Connection with
the DIGITAL_BRIDGE Assy.
No
Insert the connector
securely.
2
3
Step 2: Power supply
A
6V input
CN2003 (Pins 1-3)
No
Is the voltage
6 V?
Yes
B
IC2307 (Pin 2)
1st, 2nd Block 3.3V
No
Is the voltage
4.2 V-4.5 V
?
Yes
C
IC2307 (Pin 4)
No
Is the voltage
3.3 V?
Yes
D
IC2301 (Pin 72, etc.) 1st DSP 3.3V
No
Is the voltage
3.3 V?
Yes
E
LATCH 1
IC2304 (Pin 20)
No
Is the voltage
3.3 V?
Yes
A
SC-LX82
3
4
Is there
No
any poor connection
at Pins 1-3 of
CN2003?
Replace CN2003.
Yes
Check the output from the
REG Assy.
Check the parts and patterns
in the path.
Is IC2307
No
abnormally hot?
Replace IC2307.
Yes
The output and GND may be short-
circuited. Check the path between
them.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
4
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