DV-2850-S
62
1
2
3
4
1
2
3
4
C
D
F
A
B
E
No.
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 (IC4002)
Are the signals output from IC101-pin 36 and pin 37 (CN103-pin 1 and
pin 2) on the DVDM Assy ?
Pin 4: Approx. 45V 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 IC4002-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 (IC4002)
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 IC4002-pin 37 (DMSO) on the DVDM Assy ?
DVD MT PCB Assy
DVD IC (IC4002)
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
9
No sound
(Picture is normal)
Check the waveform (ABCK, ALRCK, ACLK, ASDATA).
DVD MT PCB Assy
DVD IC (IC4002)
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
IC
Symptoms
EEP ROM
(DVD MT Assy : IC4001)
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 : IC4002)
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.
Summary of Contents for DV-2850-S
Page 34: ...DV 2850 S 34 1 2 3 4 1 2 3 4 C D F A B E ...
Page 38: ...DV 2850 S 38 1 2 3 4 1 2 3 4 C D F A B E SIDE B A CP4003 CP8001 ...
Page 43: ...DV 2850 S 43 5 6 7 8 5 6 7 8 C D F A B E C658 C605 C604 SIDE B B C G CP603 CP601 CP605 IC651 ...
