22 Basic Troubleshooting Guide
22.1. Basic Troubleshooting Guide for Traverse Unit (DVD Module P.C.B)
Problems
Checking Points
Checking Components
a) Check SDRAM address,
data bus, CLK and other
control signals waveform
IC8051
b) Check video signals
LB8301, R8321, R8322,
LB8302, R8325, R8326
1) Distorted picture or
abnormal sound is head
during the initialization
c) Check audio DAC circuitry
* Compare the above with
OK condition HDMI
module P.C.B.
IC8421
*Check for solder short
and/or component
missing/damaged
a) Check motor driver
circuitry (+5V)
IC8251 Pin 8, 21
b) Check laser drive
circuitry (Voltages &
current)
Q8551, Q8552, Q8561,
Q8562
2) No TOC / Long TOC
c) Check LSI IC connection
to motor drive circuitry
*Compare the above with
OK condition HDMI
Module P.C.B.
IC8001 Pin 144 ,145
* Check for solder short
and/or component
missing/damaged
a) Check connection from
HDMI Module to Traverse
unit
FP8251
3) Disc not spinning
4) Traverse not moving
5) Traverse and spindle
abnormal movement
b) Check motor driver
circuitry on the voltages and
control signals
*Compare the above with
OK condition HDMI
Module P.C.B
IC8251
*Check for solder short
and/or component damaged
6) Cannot read the disc but
spindle motor is spinning
- Cannot read CD/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 condition HDMI
Module P.C.B.
Q8551, Q8552, LB8531
(For DVD Laser Drive
current)
Q8561, Q8562, LB8561
(For CD Laser Drive
current)
7) Block Noise during play
a) Check SDRAM address
and data bus signal
IC8051
8) Jitter out of specification
a) Check LD current
b) Check OPU
(Change to other unit and
confirmed operating
condition)
OPU Unit (Traverse unit),
FPC connection
129
SA-PT650P / SA-PT650PC
Summary of Contents for SA-PT650P
Page 12: ...12 SA PT650P SA PT650PC ...
Page 18: ...7 5 Using the Music Port 18 SA PT650P SA PT650PC ...
Page 54: ...10 2 Main Components and P C B Locations 54 SA PT650P SA PT650PC ...
Page 75: ...75 SA PT650P SA PT650PC ...
Page 90: ...SA PT650P SA PT650PC 90 ...
Page 98: ...SA PT650P SA PT650PC 98 ...
Page 100: ...100 SA PT650P SA PT650PC ...
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Page 135: ...25 Exploded Views 135 SA PT650P SA PT650PC ...
Page 136: ...136 SA PT650P SA PT650PC ...
Page 137: ...25 1 Cabinet Parts Location SA PT650P SA PT650PC 137 ...
Page 138: ...SA PT650P SA PT650PC 138 ...
