JVC MX-DVB10, Руководство по обслуживанию, Страница: 35 / 131

MX-DVB10
1-35
Flow of functional operation until TOC read
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 states
Tracking
servo
off states
Disc states
to rotate
TOC reading
finishes
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
500mv/div
2ms/div
Fig.1
Approx.3sec
pin 18 of
IC101(TE)
Approx
1.8V
VREF
Tracking error waveform at TOC reading
Power ON
Play Key
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
Confirm the eys-pattern
at the lead of TP101
Confirm that the voltage at the pin29
of CN101 (TP28) is "H"\"L"\"H".
Check Point
When play DVD or
CN101
pin24 (TP23) is +2V ?
When play CD, VCD or SVCD.
Check that the voltage at the
CN101 (TP2) is +2V ?
Confirm that the Focus error
S-cuve signal at the pin22 of
IC101 is approx. 2Vp-p
Confirm the waveform of
the Tracking error signal
at the pin 18 of IC101 (R116)
(See fig-1)