Flow Of Functional - JVC XL-V184BK Service Manual

XL-V184BK
XL-V284BK
Flow of Functional Operation Until TOC is Read
Check Points
^ Power ON ^
Play key
Slider turns
R E S T S W ON.
*
Play key
Slider turns
R E S T S W ON.
-Check that the voltage at the pinl5
of J202 is OV(a moment)?
Automatic tuning of
T E offset
Laser ON
Check that the voltage at the
C520 +side is +5V?
Detection of a disc
Automatic tuning of
Focus offset
Automatic measurement of
Focus S-curve amplitude
Tracking error waveform at TOC reading
P'°25of
I ^
Approx. 3sec
I C S O K T E ) l - *
Disc start»
to rotate
Autcmatic
measurament
of T E amplitude
and autcmatic
tuning of T E
balance
Disc to be
braked to stop
TOC reading
finishes
500mv/div
2ms/div
Fig-1
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
Check the Focus error S-curve
signal at the pin27 of
IC501(C505) (approx 2Vp-p).
Confirm that the signal from
pin24 of IC401 is OV as a
accelerated pulse during approx
400m8.
Confirm the waveform of the
Tracking error signal at the
pin 25 of IC501 (R509) (see
fig-1).
Automatic tuning of
Focus gain
Automatic tuning of
Tracking gain
TOC Reading
Play a Disc
Check the eye-pattern
at the lead of T P l .
(No. 20503) 1-23