Pioneer XV-DV740 Service Manual page 98

1
No. Symptoms
A
Playback impossible
(no focusing)
4
B
Playback impossible
(Spindle does not turn)
5
Playback impossible
(Playback stops)
C
6
Picture disturbance during
playback
7
(block noise, freeze, other)
No sound
8
(Picture is normal)
D
E
F
98
1
2
Diagnosis Contents
Are the signals output from IC101-pin 34 (F_DRV) and pin 35
(F_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 IC301-pin 33 (FACT) on the DVDM Assy ?
(Device control of about 2.6 V is output usually. It is fluctuated by about
± 100 mV with focus up / down.)
Are the signals output from IC101-pin 12 (A3), pin 13 (A2) and pin 14
(A1) on the DVDM Assy ?
Is pin 41 fixed LOW and is pin 38 fixed HIGH ?
Is there any part detached from the spindle motor?
Or Is there any foreign object lodged in it?
Are wires of CN105 (DVDM Assy) disconnected or damaged ?
Is signal output from IC301-pin 44 (SPDL_PDM) on the DVDM Assy ?
Does 650-nm LD deteriorate ?
If the voltage at both ends of R201 on the DVDM Assy is 0.7 V or more,
the 650-nm LD is definitely deteriorated.
Does 780-nm LD deteriorate ?
If the voltage at both ends of R211 on the DVDM Assy is 1.5 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?
Is signal output from DOUT signal (CN901-pin 21) on the DVDM Assy ? DVDM CN901-pin 21
XV-DV740
2
3
Possible Defective Points
FTS Driver IC (DVDM IC101)
Pickup
Mechanism section
Flexible cable / connector
FRONT END IC (DVDM IC301)
FTS Driver IC (DVDM IC101)
Mechanism section
(Spindle motor)
Flexible cable / connector
FRONT END IC (DVDM IC301)
650-nm LD deteriorated.
(When playback of a DVD is
impossible)
780-nm LD deteriorated.
(When playback of CD is
impossible)
FG output : FTS Driver IC
(DVDM IC101)
Disc
Disc
Disc
3
4
4