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21 Basic Troubleshooting Guide
21.1. Basic Troubleshooting Guide for Traverse Unit (DVD Module P.C.B.)
Problems
Checking Points
Checking Components
1) Distorted
picture
or
abnormal sound is heard
during initialisation
during initialisation
a) Check SDRAM address, data bus, CLK and other
control signals waveform.
b) Check video signals.
c) Check audio DAC circuitry.
* Compare the above with OK condition Module.
control signals waveform.
b) Check video signals.
c) Check audio DAC circuitry.
* Compare the above with OK condition Module.
IC8051
LB8301,R8321, R8322, LB8302, R8325, R8326
IC8420
*
IC8420
*
Check
for
solder
short
and/or
component
missing/damaged.
2) No TOC/Long TOC
a) Check motor driver circuitry (voltages).
b) Check laser drive circuitry (volrtages and current).
c) Check LSI connection to motor drive circuitry.
* Compare the above with OK condition Module.
b) Check laser drive circuitry (volrtages and current).
c) Check LSI connection to motor drive circuitry.
* Compare the above with OK condition Module.
IC8251
Q8550,Q8551,Q8552,Q8561,Q8562
IC8001
*
Q8550,Q8551,Q8552,Q8561,Q8562
IC8001
*
Check
for
solder
short
and/or
component
missing/damaged.
3) Disc not spinning
4) Traverse not moving
5) Traverse and spindle
abnormal movement
4) Traverse not moving
5) Traverse and spindle
abnormal movement
a) Check connection from Backend Module to Traverse
unit.
b) Check motor driver circuitry on voltages and control
signals.
* Compare the above with OK condition Module.
unit.
b) Check motor driver circuitry on voltages and control
signals.
* Compare the above with OK condition Module.
FP8201
IC8251
*
Check
for
solder
short
and/or
component
missing/damaged.
6) Cannot read disc but
spindle is spinning
- Cannot read CD
- Cannot read DVD
spindle is spinning
- Cannot read CD
- Cannot read DVD
a) Check laser drive circuitry (voltages and current)
- Check CD laser drive
- Check DVD laser drive
* Check voltages and LD current and compare with
OK Module.
- Check DVD laser drive
* Check voltages and LD current and compare with
OK Module.
Q8550,Q8551,Q8552,Q8560,Q8561,Q8562
Q8550,Q8560,Q8561,Q8562
Q8550,Q8551,Q8552,Q8560
*Check
Q8550,Q8551,Q8552,Q8560
*Check
for
solder
short
and/or
component
missing/damaged.
7) Block noise during play a) Check SDRAM address and data bus signal.
* Compare the above with OK condition Module.
IC8051
* Check for solder short and/or component damaged.
* Check for solder short and/or component damaged.
8) Jitter of out specification a) Check LD current
b) Check OPU (change to other unit and confirm)
OPU unit (FFC connection)
109
SA-VK650EE
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