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DVD P.W.BOARD
OPERATION
2.
Automatic servo alignment
Contents of the servo alignment and the alignment method
1) Tracking balance
2) Focus balance
3) Focus gain
4) Tracking gain
1
5) RF gain
Performed
automatically
by the TC9461
based on the command
given by the micon (microcomputer)
Set by the command the micon, reading the correction value of the TC9461, gives to the TA1254.
6) RF equalizer (DVD only)
The micon, monitoring the error rate (TC90A41 ), sets a PWM data (TC90A41 ) and provides a voltage for the TA1 254.
Sto9Ded
r-
.-
%
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p
?+ x
u ~
I
II
e
>iskDistmctmn
Fsearch
Inn&r
From Exter From
inner
4
A
H--+y4+~
'tA
'
:
ServoA@just.
~
lNITAttentirm
*
u
1 ,
+
Exter
SkrvoAdjust.
TC90A41 F +
Micon setting
+
to Pu
Equalize voltage
~11
;~]~mw;=
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ , ~pp
IL
Y
LDP2 57
II
=
b":
P2AI 58
r
P2BI 59
P2CI 60
P2DI 61
\
GNDS
62
P2FP 63
P2FN
II '11;
An automatic
alignment
method
(e.g.
automatic alignment sequence) varies with
the version of the micon. In any case, it is
important
to recognize
that the above-
mentioned
alignments
are conducted
regardless of the version.
> DVD : TC90A41 F
CD : TC9461F
TC9461 F
Amp mode setting
focus gain: F-gain, FE-gain
tracking gain : T-gain, TE-gain
RF gain : R-gain
TE : mode-TE (DPD or 3beam)
11,-
——
JI
Micon I /F
-6-
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Troubleshooting
