21 Basic Troubleshooting Guide
21.1. Basic Troubleshooting Guide for Traverse Unit (DVD Module P.C.B.)
*Compare the above with OK condition Module
Checking components
a) Check LD current OPU unit (FFC connection)
Checking Points
8) Jitter out of specification
Problems
b) Check OPU (change to other unit and confirm)
*Check for solder short and/or component
damaged
IC8051
Q8550, Q8560, Q8561, Q8562
Q8550, Q8551, Q8552, Q8560
*Check for solder short and/or component
missing/damaged
*Check for solder short and/or component
damaged
Q8550, Q8551, Q8552, Q8560, Q8561, Q8562
FP8201
IC8251
IC8251
Q8550, Q8551, Q8552, Q8560, Q8561, Q8562
IC8001
*Check for solder short and/or component
missing/damaged
LB8301, R8321, R8322, LB8302, R8325, R8326
IC8421
*Check for solder short and/or component
missing/damaged
a) Check laser drive circuitry (voltages and current)
- Check CD laser drive
*Compare the above with OK condition Module
- Check DVD laser drive
*Check voltages and LD current and compare with
a) Check SDRAM address and data bus signal
b) Check video signals
c) Check audio DAC circuitry
signals
Traverse unit
b) Check laser drive circuitry (voltages and current)
c) Check LSI connection to motor drive circuitry
*Compare the above with OK condition Module
a) Check connection from Backend Module to
b) Check motor driver circuitry on voltages and control
*Compare the above with OK condition Module
a) Check motor driver circuitry (voltages)
7) Block noise during play
spinning
- Cannot read CD
- Cannot read DVD
movement
6) Cannot read disc but spindle is
3) Disc not spinning
4) Traverse not moving
5) Traverse and spindle abnormal
2) No TOC/Long TOC
Checking components
1) Distorted picture or abnormal
sound is heard during initialisation
Problems Checking Points
a) Check SDRAM address, data bus, CLK and
other control signals waveform
IC8051
75
SA-HT340EE
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