Flow of functional operation until TOC read
Check Point
Power ON
Play Key
Slider turns REST SW ON.
Confirm that the voltage at the pin5 of CN705-1 is "H"\"L"\"H".
Automatic tuning of TE offset
Check that the voltage at the
Laser ON
pin40 of IC701 is + 5V?
Detection of disc
Automatic tuning of Focus offset Confirm that the Focus error S-cuve signal at the pin32 of IC701 is approx.2Vp-p Confirm that the signal from pin24 IC701 is 0V as a accelerated pulse during approx.400ms.
Automatic measurement of Focus S-curve amplitude
Disc is rotated
Tracking error waveform at TOC reading pin 20 of IC702(TE)
Approx. 1.8V VREF
Approx.3sec
Focus servo ON (Tracking servo ON)
Automatic measurement of Tracking error amplitude
Tracking Disc to be servo braked to stop on states Disc states TOC reading to rotate finishes Automatic measurement of TE amplitude and automatic tuning of 500mv/div 2ms/div Fig.1 TE balance Tracking servo off states
Confirm the waveform of the Tracking error signal. at the pin 20 of IC702 (R705) (See Fig.1)
