Spindle Servo Circuit - LG CED-8081B Service Manual

4. Spindle Servo Circuit

4-1. Spindle Servo Process
Pick up
E
F
C B
D A
G
H
Spindle Motor
M
Hall sensor
6
4-2. Spindle Servo
Spindle servo is as followings;
1) CD EFM CLV x8: Video CD.
2) Wobble CLV x2, x4, x8: Blank area in CD-R, CD-RW.
3) CD 15x CAV: CD-DA, eccentric CD-R/RW.
4) CD 24x CAV: Recorded area in CD-RW.
5) CD 32x CAV: CD-ROM. Recorded area in CD-R.
– Spindle Servo is controlled by IC201 (OTI-9790) and servo signal is output via DMO (pin 2).
30
8
IC510 BA6664FM
IC508
BU4053
SPN8/12Cm
IC301
SPNON
µ-com
SPNFG
REVDEF
IC401 OTI9071A
WBLIN
Wobble Signal
Generator
RF
SRF
CD EFM CLV
CAV x32
DMO
SPNBOOST
ATIP CLV, FG
EFM
IC201 OTI9790
CD-DSP/SERVO
Decode PLL
Frequency
Controller
FILTER
TON DEFS
MOTOR SPEED
CONTROLLER
LOCK