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3 7 63 1515 0
Flow of Functional Operation Until TOC Read
Power ON
TE
L 13942296513
Tracking error waveform at TOC reading
Approx.3sec
pin 25 of
IC501(TE)
Approx
1.8V
VREF
Tracking
servo
off statas
Disc statas
to rotate
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
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Power Key
Automatic measurement of
Focus A-curve amplitude
Tracking
Disc to be
servo
braked to stop
on statas
TOC reading
finishes
500mv/div
2ms/div
Fig.1
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2 9
8
Slider turns REST
SW ON.
Automatic tuning
of TE offset
Laser ON
Detection of disc
Automatic tuning of
Focus offset
Disc is rotated
Q Q
3
6 7
1 3
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 error gain
Automatic tuning of
Tracking error gain
TOC reading
.
Play a disc
9 4
2 8
Check Point
Check that the voltage at the pin22
of CN501 is 0V (a moment)?
Check that the voltage at the
pin3 of IC501 is + 5V?
Confirm that the Focus error
S-curve signal at the pin27 of
IC501 is approx.2Vp-p
1 5
0 5
8
2 9
9 4
Confirm the waveform of
the Tracking error signal
at the pin25 of IC501
(See fig-1)
m
co
Confirm the eys-pattern
at the lead of ARF(TP)
KD-S50
9 9
2 8
9 9
1-13
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