MN662785TBUC Datasheet, PDF (60/89 Pages) Panasonic Semiconductor – LSI FOR COMPACT DISC/CD ROM PLAYER

MN662785TBUC
7-1 (7) Automatic adjustment
Following is a list of automatic adjustment.
Command (HEX)
(B7 to B0)
Description
Table 7-1-7
Time Traverse
required operation
Offset
AOC1
(Note)
F9
Averages and corrects the focus error values and 50 ms FWD/REV
tracking error values as offset when the laser is
to enabled
turned on or off.
140 ms
Fo
balance
F7
Inputs the disturbance into the focus servo loop, _Within
and makes corrections so that the envelope ripple
for the 3T component of the RF signal in the
0.5 s
STOP
ABC1
positive and negative parts of the FE signal
should be balanced. The output pin for
corrections is FBAL.
Tr
balance
FB
The average tracking error value without the
tracking servo is used as a balancing value to
Within STOP
1s
ABC2
make corrections. The output pin for corrections
is TBAL.
Fo
rough
gain
AGC1
Tr
rough
gain
AGC2
Fo
fine
gain
FAGC
Tr
fine
gain
TAGC
FC
Focus search is performed at approx. 5.4 Hz or
Set FWD/REV
1.3 Hz, and the disturbance input amount for the ^{between enabled}
fine AGC is determined using focus error S-curve ^{190 ms}
p-p value. The gain will be unchanged.
and
780 ms
FD
The p-p value of the tracking error without the
tracking servo determines the disturbance input
Set
between
STOP
amount for the fine AGC. The gain will be
135 ms
unchanged.
and
350 ms
FE
Inputs the disturbance into the focus servo loop,
and adjusts the gain crossover to the frequency
set by the microcomputer command.
Within
0.5 s
STOP
FF
Inputs the disturbance into the tracking servo
loop, and adjusts the gain crossover to the
Within STOP
0.5 sɹ
frequency set by the microcomputer command.
Note) Do not use FAh, a conventional AOC2 command.
SDD00026AEM
60