Trouble Shooting - JVC FS-X3 Service Manual

5.1 Flow of functional operation until TOC read
Power ON
Tracking error waveform at TOC reading
Approx. 3sec
IC601
20pin(TEOUT)
Approx.
1.4V
VREF
Tracking
servo
off status
Disc status
Automatic measurement
to rotate
of TE amplitude and
automatic tuning of TE
balance
1-24 (No.MB004)
SECTION 5

TROUBLE SHOOTING

Slider turns REST
Disc play Key
Automatic tuning of FO offset and TE offset
Automatic measurement of
Focus S-curve amplitude
(Tracking servo ON)
Automatic measurement of
Tracking error amplitude
Tracking Disc to be
servo braked to stop
on status
Automatic tuning of
TOC reading
Tracking error balance
finishes
500mv/div
2ms/div
Fig.1
Automatic tuning of
Focus error balance
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
SW ON.
Laser ON
Detection of disc
Disc is rotated
Focus servo ON
TOC reading
Play a disc
Check Point
Confirm that the voltage at
the pin32 of IC251 is 0V.
(ON: 0V)
Confirm that the Focus error
S-curve signal at the pin32 of
IC651 is approx. 1.4Vp-p.
Confirm that the signal from
pin24 of IC651(one side of
R808) is 0V as a accelerated
pulse during approx. 640ms.
Confirm the waveform of the
Tracking error signal at the
pin20 of IC601(one side of
R604) (See Fig.1.)
Confirm the eye-pattern
at the pin5 of IC601