DV-285-S
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Symptoms
Diagnosis Contents
Possible Defective Points
4
A tray cannot be opened.
(An opening screen is
displayed on the monitor)
Does the voltage of CP2302-pin 3 and pin 1 on the DVD MT Assy
change normally ?
Pin 5 (SW2(TRIN)): Tray is fully closed: "L"
Pin 3 (SW1(TROUT)): Tray is fully opened: "L"
Tray SW
Is a LOAD-DRV signal reaching ?
DVD MT PCB Assy
DVD IC (IC4001)
Are the signals output from IC2301-pin 36 and pin 37 (CP2302-pin 4
and pin 5) on the DVDM Assy ?
Pin 4: Approx. 4.5V during opening tray approx. 0V during closing tray.
Pin 5: Approx. 0V during opening tray approx. 4.5V during closing tray.
DVD MT PCB Assy
FTS Driver IC (IC2301)
Are wires of CP2302 and CP2303 on the DVDM Assy disconnected or
damaged ?
Connector / cable
Does the voltage of CD2301-pin 5 change by pressing the Inside
switch.
Inside switch
5
Playback impossible
(no focusing)
Are the signals output from IC2301-pin 9 (F+) and pin 8 (F–) on the
DVDM Assy ?
DVD MT PCB Assy
FTS Driver IC (IC2301)
Does 650-nm LD emit light ?
Does a pickup lens move up / down ?
Does an actuator spring bend ?
Pickup
Are plastic parts damaged ? Or is a shaft detached ?
Is the turntable detached or tilted ?
Mechanism section (motor)
Is flexible cable of CP2301 on the DVD MT Assy disconnected or
damaged ?
Flexible cable / connector
Is signal output from IC4001-pin 42 (FOSO) on the DVDM Assy ?
(Device control of about 1.4 V is output usually. It is fluctuated by about
±
250 mV with focus up / down.)
DVD MT PCB Assy
DVD IC (IC4001)
6
Playback impossible
(Spindle does not turn)
Are the signals output from IC2301-pin 10 (MOT SPDL–), and pin 11
(MOT SPDL+) on the DVD MT Assy ?
Is pin 33,34 (STBY) fixed LOW?
DVD MT PCB Assy
FTS Driver IC (IC2301)
Is there any part detached from the spindle motor ?
Or Is there any foreign object lodged in it ?
Mechanism section
(Spindle motor)
Are wires of CP2303 on the DVD MT Assy disconnected or damaged ? Flexible cable / connector
Is signal output from IC4001-pin 37 (DMSO) on the DVDM Assy ?
DVD MT PCB Assy
DVD IC (IC4001)
7
Playback impossible
(Playback stops)
Does 650-nm LD deteriorate ?
If the voltage at each both ends of R2303 and R2305 on the DVD MT
Assy is 0.4 V or more, the 650-nm LD is definitely deteriorated.
650-nm LD deteriorated.
(When playback of a DVD is
impossible)
Does 780-nm LD deteriorate ?
If the voltage at each both ends of R2302 and R2304 on the DVD MT
Assy is 0.4 V or more, the 780-nm LD is definitely deteriorated.
780-nm LD deteriorated.
(When playback of a CD is
impossible)
Are there scratches or dirt on the disc ?
Disc
8
Picture disturbance during
playback
(block noise, freeze, other)
Are there scratches or dirt on the disc ?
Is there a problem with the format of the disc ?
Disc
Check the waveform (ABCK, ALRCK, ACLK, ASDATA).
DVD MT PCB Assy
DVD IC (IC4001)
Is signal output from IC8004-pin 7 and pin 8 on the DVD MT Assy ?
DVD MT PCB Assy
Audio Dac IC (IC8004)
Symptoms That May Occur When Any Of The Following ICs Is In Failure
Symptoms
User's data cannot be stored in memory.
The ID number is lost.
16M Flash ROM
(DVD MT Assy : IC4004)
The power cannot be turned on.
Downloading of the firmware cannot be performed.
DVD IC
(DVD MT Assy : IC4001)
Any kind of symptoms (no power, a failure in any of the servo, video and audio systems, etc.) may be
generated, because the DVD processing is performed by a single chip.
64M SDRAM
(DVD MT Assy : IC4005)
No power.
Block noise is generated during playback.
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