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(10) Picture is distorted or abnormal sound occurs at intervals of several seconds.
Does JITOUT
change periodically?
(2V or more in peak
value, except
during kick)
Feed system is defective (drive gain is defective: too large).
Check the waveform according to a) in (9).
Play back a simple disc with no angle change.
OK when the following waveform appears at intervals
of several seconds.
5~10Sec.
(11) Others (unusual events experienced to date)
* Problem occurs with double-layer discs although no problem occurs with single-layer DVD.
(Error occurs, or search becomes unstable and takes longer.)
Crosstalk might occur from tracking to focus system.
--- When FE was observed during search (skip, etc.), it was found that a wave resembling TE
with an amplitude of 200mVp-p was riding on FE.
--- Mechanical unit was replaced.
* Error frequently occurred in the outer part of discs although no error occurred in the inner part.
--- Mechanical unit was replaced because tilt seemed to be defective.
(12) CD During normal playback operation
a) Is TOC reading normal?
Displays total time
for CD-DA.
Shifts to double-speed
mode for V-CD.
YES
b)Playback possible?
(13) Others
V-CD : Frequent occurrence of error in inside and outer.
(Even the disk without the wound : when generated.)
Waveform observation
--- Is the oscillation frequency of about 700~900Hz output?
(Borrow a pertinent disk for the complaint for the combination with the disk.)
--- Exchanges mechanism for the mechanism resonance.
Some system other
NO
than servo may be
YES
1~1.2V
NO
Please refer to "Servo Volume" flow.
NO
*--:-- is displayed during FL serch.
According to [*Cannot serch ] for DVD(9), check the feed
and tracking systems.
*No sound is output although the time is displayed.(CA-DA)
*DAC, etc, other than servo.
*The passage of time is not stable, or picture is abnormal.(V-CD)
*The wound of the disc and dirt are confirmed.
defective.
XV-D721BK
XV-D723GD
If this voltage is too
high (2V or more, for
example), feed motor
may be defective, or
the mechanical unit
has seized.
1-17
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