5678
No.SymptomsDiagnosis ContentsPossible Defective Points
4A tray cannot be opened.Does the voltage of CN103-pin 3 and pin 5 on the DVDM Assy change
Tray SW
(An opening screen is normally ?
displayed on the monitor)Pin 3 (SW2(TRIN)): Tray is fully closed: "L"A
Pin 5 (SW1(TROUT)): Tray is fully opened: "L"
DVDM Assy
Is a LOAD-DRV signal reaching ?
DVD IC (IC601)
Are the signals output from IC101-pin 36 and pin 37 (CN103-pin 1 and
pin 2) on the DVDM Assy ?DVDM Assy
Pin 36: Approx. 6V during opening tray approx. 0V during closing tray.FTS Driver IC (IC101)
Pin 37: Approx. 0V during opening tray approx. 6V during closing tray.
Are wires of CN104 and CN103 on the DVDM Assy disconnected or
Connector / cable
damaged ?
Does the voltage of CN102-pin 12 change by pressing the Inside
Inside switch
switch.
5Playback impossibleAre the signals output from IC101-pin 34 (FOCS_DRV) and pin 35 DVDM AssyB
(no focusing)(FOCS_RTN) on the DVDM Assy ?FTS Driver IC (IC101)
Does 650-nm LD emit light ?
Does a pickup lens move up / down ?Pickup
Does an actuator spring bend ?
Are plastic parts damaged ? Or is a shaft detached ?
Mechanism section (motor)
Is the turntable detached or tilted ?
Is flexible cable of CN101 on the DVDM Assy disconnected or
Flexible cable / connector
damaged ?
Is signal output from IC601-pin 12 (FOSO) on the DVDM Assy ?
DVDM Assy
(Device control of about 1.4 V is output usually. It is fluctuated by about
DVD IC (IC601)
? 250 mV with focus up / down.)
6Playback impossibleAre the signals output from IC101-pin 12 (W), pin 13 (V) and pin 14 (U)
DVDM AssyC
(Spindle does not turn)on the DVDM Assy ?
FTS Driver IC (IC101)
Is pin 41 (STBY) fixed LOW and is pin 38 (ENDM) fixed LOW ?
Is there any part detached from the spindle motor ?Mechanism section
Or Is there any foreign object lodged in it ?(Spindle motor)
Are wires of CN102 on the DVDM Assy disconnected or damaged ?Flexible cable / connector
DVDM Assy
Is signal output from IC601-pin 18 (DMSO) on the DVDM Assy ?
DVD IC (IC601)
7Playback impossibleDoes 650-nm LD deteriorate ?650-nm LD deteriorated.
(Playback stops)If the voltage at each both ends of R22 and R25 on the DVDM Assy is (When playback of a DVD is
0.4 V or more, the 650-nm LD is definitely deteriorated. impossible)
Does 780-nm LD deteriorate ?780-nm LD deteriorated.
If the voltage at each both ends of R21 and R26 on the DVDM Assy is (When playback of a CD is
0.4 V or more, the 780-nm LD is definitely deteriorated. impossible)
D
DVDM Assy
Is there abnormality in FG waveform ?
FG output : FTS Driver IC (IC101)
Are there scratches or dirt on the disc ?Disc
8Picture disturbance during
Are there scratches or dirt on the disc ?
playbackDisc
Is there a problem with the format of the disc ?
(block noise, freeze, other)
9No soundDVDM Assy
Check the waveform (ABCK, ALRCK, ACLK, ASDATA).
(Picture is normal)DVD IC (IC601)
Is signal output from IC701-pin 7 and pin 8 on the DVDM Assy ?DVDM Assy
Audio Dac IC (IC701)
E
F
DV-2750-S59
5678 |
ACEC
