Sanyo FISHER DVD-1500 Service Manual page 7

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
5) RF gain
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 TA1254.
FOCUS DRV.
IC601 25pin
FE
TP513
TE
TP512
DiskDistinction
INITAttention
SLED
IC601 20pin
VRA
48
P1FN 49
P1FP
50
LDP1
51
P1DI
52
P1CI
53
P1BI 54
P1AI
55
GNDR
56
LDP2
57
P2AI
58
P2BI
59
P2CI 60
P2DI
61
GNDS 62
P2FP
63
P2FN 64
1
Performed automatically by the TC9461 based on the command
given by the micon (microcomputer)
Fsearch
From Exter From inner
Inner
ServoAdjust.
Exter
ServoAdjust.
TC90A41F
Micon Setting
Equalize voltage
to PU
47 46 45 44 43 42 41 40 39 38
APC1
sel-RF
R-gain
EQ
Adjustment
RF Ripple
mode-IC Generation
F-gain
Adjustment
sel-FE
FE
Generation
F-gain
Adjustment
sel-PD
sel-TE
sel-DPD
DPDTE
Generation
sel-LVL
mode-TE
T-gain 3BTE
Adjustment Generation
APC2
2 3 4 5 6 7 8 9 10 11
Data read
37 36 35 34 33
32 DPDB
VccR
31
NC
30
NC
29
DVD : TC90A41F
RFO
28
CD : TC9461F
27 RPP
RPB
26
RPO TC9461F
25
RPZ
24
FTE-gain
Adjustment
VssS
23
DFTN
22
TE-gain
21 FEO
Adjustment
20 TEO
Level
Detection
19 LVL
Time
VccP
18
Constant
BUS
Adjustment
17 VCKF
12 13 14 15 16
DVD : PLCK (27MHz)
CD : BCK (1.4MHz)
Micon I / F
- 6 -
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.
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)