JVC CA-C55BK - Functional Operation Flow Until TOC Read

XT-C55BK
Flow
of
Functional
Operation
Until
TOC
is
Read
Check Points
| i ae,
Check that the
voltage at the lead
of R873 is OV?
Slider turns
REST SW ON.
Automatic tuning
of TE offset
Check that the
voltage at the pin40
of IC801 is +5V?
w Tracking error waveform at TOC reading
pin25 of
A 8
1C830 (TE) | <—__Aece = __|
Approx,
VREF. 1.8V
XY" /
vw
Dise to be
braked to stop
Dise starts
to rotate
tracking tracking
servo servo
off status onstatus
Autematic
measurement
of TE amplitude
and automatic
tuning of TE
balance
3-20 (No.20474)
TOC reading
500mv/div
2ms/div
Fig-1
Automatic measurement of
‘Focus S-curve amplitude
Detection of a disc
Automatic tuning of
Focus offset
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic measurement of
Tracking error amplitude
Automatic tuning of
Tracking error balance
Automatic tuning of
Focus error balance
Automatic tuning of
Focus gain
Automatic tuning of
Tracking gain
TOC Reading
Play a Disc
Check Points
ee
Check the Focus error S-curve
signal at the pin27 of
1C830 (approx 2Vp-p).
Confirm that the signal from
pin24 of IC810 is OV as a
accelerated pulse during approx
400ms.
Confirm the waveform of the
Tracking error signal (see fig-1).
Check the eye-pattern
at the lead of C823.