JVC XV-521BK Service Manual page 21

Troubleshooting
Servo volum
Press key
Is tray
operation
correct?
Y
Is the traverse moving
along the innermost
perimeter for SW detection?
Y
"NO DISC" message appears
immediately after vertical
movement of the PU Lens.
Y
Does it show "NO DISC" immediately?
Does it show "NO DISC" a few seconds
later without DISC rotation?
Disc rotation becomes abnormally fast.
N
Is focus retraction OK?
FE
OFF
ON
Even when it retracts
correctly, if it is out of focus
and makes repeated retries
with a clicking sound, it is
in error.
Y
Is tracking retraction OK?
TE
OFF ON
If TE waveform reappears
or fails to converge after the
TE retraction, it is in error.
Y
Is the spindle servo
locked correctly?
Is the RF OUT waveform
locked correctly?
Y
A
N See "3. OPEN/CLOSE
Operations", Troubleshooting.
N
See "(3) Traverse Movement Error"
in "Checkpoints for Individual Errors".
Y
See "(2) Disk Detection, Determination Error"
in "Checkpoints for Individual Errors".
Y
See "(1) Spindle Startup Error"
in "Checkpoints for Individual Errors".
See (4) "Focus ON Error" in
N
"Checkpoints for Individual
Errors".
See (5) "Tracking ON Error",
N
Checkpoints for Individual
Errors.
See "(6) Spindle CLV Error",
N
"Checkpoints for Individual
Errors".
A
Two layers of DVD only.
Is the inter-layer jump OK?
FE
LO LI
Y
Has the disc information
been collected?
Disc change or stop
will result
Y
Is playback possible?
Y
OK !
XV-521BK/523GD/522SL
N
(8) Inter-layer jump error
N
(7) Address read error
Check (9), (10), (11), and (12)
N
items in "Checkpoints for
Individual Errors".
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