Pioneer DV-2750-S Service Manual page 59

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