Dsp Troubleshooting - Pioneer SX-LX70SW Service Manual

5

5.2 DSP TROUBLESHOOTING

QQ
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Troubleshooting
• The following flow is the diagnosis method when the sound is not out from the SP output.
• It is assumed that there is no loose connection or damage in the LCRs.
• Refer to the Block Diagram as well as the Schematic Diagram about the signal flow.
Step 1: Preliminary connecting confirmation
Confirm the following items before checking
Is there no
problem on the connection
at screw, connector,
or FFC cable
To Step 2
Step 2: Power supply
MAIN ASSY
CN1001 Pin 2
Pin 4
Pin 8
TE
L 13942296513
Is the
each voltage
12 V, 5 V and
3.3 V ?
Yes
Q1302 Drain VS+5
Is the voltage
5 V?
Yes
IC3011 (Pin 16)
Is the voltage
12 V?
Yes
IC3012 (Pin 8)
www
Is the voltage
12 V?
Yes
.
5
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No
Tighten the coonection.
?
Yes
VS+12 input
VE+5 input
VS+3R3 input
Is there any
No
Yes
loose connection at CN1001
or Connector Assy PF14PP-
S27 at pins 2, 4, 8 ?
Replace CN1001 or
Connector Assy PF14-
No
PP-S27.
Check the power output
of the SW Power Supply.
No
Replace Q1302.
FUNCTION
No Check the parts and patterns
in the path.
OP AMP
No Check the parts and patterns
in the path.
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y
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6
8
IC3014 (Pin 3)
Is the voltage
5 V?
Yes
IC3013 Pin 6
Pin 7, 14
Is the each
voltage
5 V, 3.3 V ?
Yes
IC301 Pin 13
Q Q
3 6 7 1 3
Pin 21, 38
Is the each
voltage
5 V, 3.3 V ?
Yes
IC651 (Pin 16)
Is the voltage
3.3 V?
Yes
IC901 (Pins 7,8)
Is the voltage
5.0 V?
Yes
L906
Is the voltage
1.2 V?
u163
Yes
.
A
SX-LX70SW
6
7
2 9 9 4 2 8
5V REG
No
Replace IC3014.
5 V input
A/D
3.3 V input
Check the parts and patterns
No
in the path.
5 V input
1 5 0 5 8 2 9 DIR 9 4
3.3 V input
Check the parts and patterns
No
in the path.
I2S SW
No Check the parts and patterns
in the path.
DC-DC Converter
No
Check the parts and patterns
in the path.
LC902 side
m
No
Replace IC901
co
7
8
9 9
A
B
C
2 8 9 9
D
E
F
27
8