Flow Of Functional Operation Until Toc Read (Cd) - JVC UX-P55 Service Manual

3.7

Flow of functional operation until TOC read (CD)

Power ON
Tracking error waveform at TOC reading
Approx.1sec
pin 20 of
IC601(TE)
Approx
1.7V
VREF
Tracking
servo
off
Disc start
Automatic measurement
to rotate
of TE amplitude and
automatic tuning of
TE balance
Slider turns REST
Power Key
Automatic tuning
of TE offset
Detection of disc
Automatic tuning of
Automatic measurement of
Focus S-curve amplitude
Automatic measurement of
Tracking error amplitude
Tracking
Disc to be
servo ON
braked to stop
Automatic tuning of
TOC reading
Tracking error balance
finishes
500mv/div
2ms/div Fig.1
SW ON.
Laser ON
Focus offset
Disc is rotated
Focus servo ON
(Tracking servo ON)
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
Check that the voltage at the pin 5
of CN801 is 0V?
Check that the voltage at the
pin2 of IC601 is 4.4V?
Confirm that the Focus error
S-cuve, ie at the pin23 of
IC601 is approx.2Vp-p
Confirm that the siganl from
pin 5,6 of IC801 is a 2V
accelerated pulse with approx.
700ms.
Confirm the waveform of
the Tracking error signal
at the pin20 of IC601
(See fig-1)
Confirm the eye-pattern
at the lead of TP1
(No.22036)1-23