Samsung DVD-C700 Service Manual page 60

5-4 Servo
5-4-1 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).
5-4-2 Block Diagram
SLED M/T
LD
HALL
PCB
DECK
OPEN/CLOSE ROULETTE
MOTOR MOTOR
DRIC2 DRIC3
KA3010D KA3082
MOTOR DRIVE
ROULETTE MOTOR DRIVE
OPEN/CLOSE S/W
ROLUETTE SENSOR
DISC SENSOR
Samsung Electronics
DISC
SPINDLE M/T
PD
CN1
HA1+
HA1–
HA2–
HA2+
SLED+
SLED–
AO
DO
CO
BO
FO
EO
PD
LD
FOCUSING
F–
T+
TRACKING
T–
F+
SPINDLE
#
SIC8
@
NJM2903
%
^
+ t
1 &
2
8
7
DRIC2
KA3010D
!
@
0
DRIC1
KA3011D
"
Fig. 5-17
Circuit Descriptions
TMP 93CS41F
›
RIC1
KS1461
!
x
LC86P6232
FRONT MICOM
MIC1
SIC1
KS1452
FIC1
5-11