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Flow of functional operation until TOC read (MD)
Mechanism Operation ON
Focus S-curve amplitude
Power ON
MD play key
Slider turns REST
Switch ON.
Laser ON
Detection of Disc
Automatic tuning of
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
Check Point
Confirm that the voltage
at the pin 9 of CN408 are 0V
Confirm that the voltage
at the pin 50 of IC500 are 4V
Confirm that the Focus error
S-cuve signal at the pin34 of
IC310 is approx.2Vpp
It is confirmed that pin7 of CN408
become 0V from VREF as an acceleration
pulse between about 400ms.
Confirm that the eye-pattern
at the pin38 of IC310
UX-F70MD/UX-F72MD
1-41
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