JVC HX-Z9, Service Manual

Page: 37 / 77

(No.22066)1-37
4.5 Flow of functional operation untill TOC read (CD)
Slider turns REST
SW ON.
Automatic tuning
of TE offset
Laser ON
Detection of disc
Automatic measurement of
Focus S-curve amplitude
Automatic tuning of
Focus offset
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic tuning of
Tracking error balance
Automatic measurement of
Tracking error amplitude
Automatic tuning of
Focus error balance
Disc to be
braked to stop
Tracking
servo ON
Tracking
servo
off
Disc start
to rotate
TOC reading
finishes
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
500mv/div
2ms/div
Fig.1
Approx.1sec
pin 20 of
IC601(TE)
Approx
1.7V
VREF
Tracking error waveform at TOC reading
Power ON
Power Key
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)
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
Confirm the eye-pattern
at the lead of TP1
Check that the voltage at the pin 5
of CN801 is 0V?
Check Point
Check that the voltage at the
pin2 of IC601 is 4.4V?