XV-DV740
98
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No.
Symptoms
Diagnosis Contents
Possible Defective Points
4
Playback impossible
(no focusing)
Are the signals output from IC101-pin 34 (F_DRV) and pin 35
(F_RTN) on the DVDM Assy ?
FTS Driver IC (DVDM IC101)
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
Is flexible cable of CN101 on the DVDM Assy disconnected or damaged
?
Flexible cable / connector
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.)
FRONT END IC (DVDM IC301)
5
Playback impossible
(Spindle does not turn)
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 ?
FTS Driver IC (DVDM IC101)
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 CN105 (DVDM Assy) disconnected or damaged ?
Flexible cable / connector
Is signal output from IC301-pin 44 (SPDL_PDM) on the DVDM Assy ?
FRONT END IC (DVDM IC301)
6
Playback impossible
(Playback stops)
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.
650-nm LD deteriorated.
(When playback of a DVD is
impossible)
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.
780-nm LD deteriorated.
(When playback of CD is
impossible)
Is there abnormality in FG waveform ?
FG output : FTS Driver IC
(DVDM IC101)
Are there scratches or dirt on the disc ?
Disc
7
Picture disturbance during
playback
(block noise, freeze, other)
8
No sound
(Picture is normal)
Is signal output from DOUT signal (CN901-pin 21) on the DVDM Assy ? DVDM CN901-pin 21
Are there scratches or dirt on the disc ?
Disc
Is there a problem with the format of the disc?
Disc
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