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45

Figure 5 D-Amp IC Configuration

46

Problems Checking 

Points

Checking 

components

b) Check video signals (Y,C)

LB8301, R8321, R8323,
LB8302, R8325, R8327

a) Check SDRAM address, data 
bus, CLK and other control signals 
waveform

IC8051

1) Distorted picture or 
abnormal sound is head 
during the initialization

c) Check audio DAC circuitry 

* Compare the above with 
OK condition DVD Module
P.C.B

IC8420 (Pin 3, 10 to 11)

LB8421, LB8422
*Check for solder short and/or  
component missing/damaged 

b) Check laser drive circuitry 
(Voltages & current) 

Q8551, Q8552  (For DVD),
Q8561, Q8562  (For CD)  

a) Check motor driver circuitry 
(+5V)

IC8251 Pin 8, 21

2) No TOC/Long TOC

c) Check LSI IC connection to

motor drive circuitry 
* Compare the above with OK 
condition DVD Module P.C.B. 

IC8001 Pin 66, 67
IC8251 Pin 15 to 16, 17, 18 
* Check for solder short and/or 
component missing/damaged 

a) Check connection from 
DVD 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 DVD 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 

DVD Module P.C.B.

Q8551, Q8552, LB8551
(For DVD Laser Drive current) 
Q8561, Q8562, LB8561 
(For CD Laser Drive current)  

7) Block Noise during play 

a) Check SDRAM IC 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 (FP8531 & FP8251) 

47

Prepare service tools before process service position.

Service Tools

Remarks

Main P.C.B. (CN2808) - D-Amp P.C.B. (CN5050)

REEX0930 (17P FFC)

Main P.C.B. (ZJ2701) - SMPS P.C.B. (CN5802)

REXX0680 (11P Cable)

SMPS P.C.B. (H5801) - D-Amp P.C.B. (CN5500)

REXX0683 (8P Cable)

48

“ATTENTION SERVICER”
Be careful when disassembling and servicing.
Some chassis components may have sharp edges.

1. This section describes the disassembly procedures for all the major printed circuit boards and main components. 
2. Before the disassembly process was carried out, do take special note that all safety precautions are to be carried

3. For assembly after operation checks or replacement, reverse the respective procedures.

4. Do take note of the locators on each printed circuit board during reassembling procedures.
5. The Switch Regulator IC may have high temperature after prolonged use. 
6. Use caution when removing the top cabinet and avoid touching heat sinks located in the unit.

7. Select items from the following index when checks or replacement are required.

• Disassembly of Top Cabinet
• Disassembly of DVD Mechanism Unit (CR14D)
• Disassembly of Rear Panel
• Disassembly of Front Panel Assembly
• Disassembly of Panel P.C.B., Volume P.C.B., Remote Sensor P.C.B., Side Bar (L/R) LED P.C.B.
• Disassembly of Mic P.C.B. 
• Disassembly of USB P.C.B.
• Disassembly of Music Port P.C.B.
• Disassembly of CD Lid
• Disassembly of Deck Mechanism Unit
• Disassembly of Deck P.C.B.
• Disassembly of Deck Mechanism
• Disassembly of Deck Mechanism P.C.B.
• Disassembly of Cassette Lid
• Rectification for Tape Jam Problem
• Disassembly of D-Amp P.C.B.
• Replacement of Audio Digital Power Amp IC (IC5000)
• Replacement of Audio Digital Power Amp IC (IC5200)
• Replacement of Audio Digital Power Amp IC (IC5300)
• Replacement of Audio Digital Power Amp IC (IC5400)
• Disassembly of Main P.C.B.
• Disassembly of SMPS P.C.B.
• Replacement for Switching Regulator IC (IC5701)
• Replacement for Switching Regulator Diode (D5702)
• Replacement for Regulator Diode (D5801)
• Replacement for Regulator Diode (D5802)
• Replacement for Regulator Diode (D5803)
• Disassembly of AC Inlet P.C.B.
• Disassembly of DVD Module P.C.B.
• Disassembling and Assembling of Traverse Unit.