Flow Of Functional Operation Until Toc Read - JVC MX-GC5 Service Manual

Flow of functional operation until TOC read

Play Key
Power ON
Tracking error waveform at TOC reading
Approx.3sec
pin 20 of
IC611(TE)
Approx
0.3V
VREF
Tracking
Tracking
servo
servo
on states
off states
Disc states
to rotate
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
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Slider turns REST
SW ON.
Automatic tuning
of TE offset
Laser ON
Detection of disc
Automatic tuning of
Focus offset
Automatic measurement of
Focus S-curve amplitude
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic measurement of
Tracking error amplitude
Disc to be
braked to stop
Automatic tuning of
TOC reading
finishes
Tracking error balance
500mv/div
2ms/div Fig-1
Automatic tuning of
Focus error balance
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
Check Point
Confirm that the voltage at the pin5
of CN702 is "H"\"L"\"H".
Check that the voltage at the
pin10 of IC701 is + 0V?
Confirm that the Focus error
S-cuve signal at the pin31 of
IC701 is approx.2Vp-p
Confirm that the signal from
pin26 IC701 is 0V as a
accelerated pulse during
approx.400ms.
Confirm the waveform of
the Tracking error signal.
at the pin 29 of IC701 (R729)
(See fig-1)
Confirm the eys-pattern
at the lead of Pin 2 of IC 701