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6-4 Servo
6-4-1 Outline
SERVO system of DVD is divided into Focusing SERVO, Tracking SERVO, SLED Linked SERVO and CLV
SERVO (DISC Motor Control SERVO).
1) Focusing SERVO
Focuses the optical spot output from object lens onto the disc surface. Maintains a uniform distance between
object lens of Pick-up and disc (for surface vibration of disc).
2) Tracking SERVO
Make the object lens follow the disc track in use of tracking error signal (created from Pick-up).
3) SLED Linked SERVO
When the tracking actuator inclines outwardly as the object lens follows the track during play, the SLED motor
moves slightly (and counteracts the incline).
4) CLV SERVO (DISC Motor Control SERVO)
Controls the disc motor to maintain a constant linear velocity (necessary for RF signal).
6-4-2 Block Diagram
SLED M/T
LD
PD
HALL
PCB
FOCUSING
TRACKING
Samsung Electronics
All manuals and user guides at all-guides.com
DISC
SPINDLE M/T
CN1
HA1+
#
HA1–
SIC8
@
HA2–
NJM2903
%
HA2+
^
SLED+
SLED–
AO
DO
CO
BO
FO
1
EO
2
PD
8
DRIC2
7
LD
KA3010D
or
F–
FAN8000
T+
!
@
T–
F+
SPINDLE
DRIC1
KA3011D
Fig. 6-17
RIC1
KS1461
+
t
&
0
"
Circuit Descriptions
MIC1
TMP 93CS41F
›
SIC1
KS1452
!
x
6-11
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