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MN 6 6 2 7 8 5 T B U C
7 - 1 ( 7 ) A u t o m a t i c a d j u s t m e n t
F o l l o w i n g i s a l i s t o f a u t o m a t i c a d j u s t m e n t .
C o m m a n d ( H E X )
O f f s e t
A O C 1
( N o t e )
F o
b a l a n c e
A B C 1
T r
b a l a n c e
A B C 2
Fo
rough
gain
AGC1
Tr
rough
gain
AGC2
Fo
fine
gain
FAGC
Tr
fine
gain
TAGC
N o t e ) D o n o t u s e F A h , a c o n v e n t i o n a l A O C 2 c o m m a n d .
( B 7 t o B 0 )
F 9
F 7
F B
F C
F D
F E
F F
Description
Averages and corrects the focus error values and
tracking error values as offset when the laser is
turned on or off.
Inputs the disturbance into the focus servo loop,
and makes corrections so that the envelope ripple
for the 3T component of the RF signal in the
positive and negative parts of the FE signal
should be balanced. The output pin for
corrections is FBAL.
The average tracking error value without the
tracking servo is used as a balancing value to
make corrections. The output pin for corrections
is TBAL.
Focus search is performed at approx. 5.4 Hz or
1.3 Hz, and the disturbance input amount for the
fine AGC is determined using focus error S-curve
p-p value. The gain will be unchanged.
The p-p value of the tracking error without the
tracking servo determines the disturbance input
amount for the fine AGC. The gain will be
unchanged.
Inputs the disturbance into the focus servo loop,
and adjusts the gain crossover to the frequency
set by the microcomputer command.
Inputs the disturbance into the tracking servo
loop, and adjusts the gain crossover to the
frequency set by the microcomputer command.
S D D 0 0 0 2 6 A E M
T a b l e 7 - 1 - 7
T i m e
T r a v e r s e
r e q u i r e d
o p e r a t i o n
50 ms
FWD/REV
to
enabled
140 ms
Within
STOP
0.5 s
Within
STOP
1 s
Set
FWD/REV
between
enabled
190 ms
and
780 ms
Set
STOP
between
135 ms
and
350 ms
Within
STOP
0.5 s
Within
STOP
0.5 s
6 0
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