Samsung DVD-P355B/XEU, DVD-P355B/XEH, DVD-P355B/XEG, DVD-P355B/XET Outline, Block Diagram

Circuit Operating Descriptions

13-4 Servo

13-4-1 Outline

SERVO system of DVD is Compoced of 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).

13-4-2 Block Diagram

	1
	2
OPEN	5
	6
CLOSE	7
TM1	4
TM+	3
SP+	10
SP-	11
	8
	9

7

	26	25	13	14
	28
	27
LED				FIC1
POWER
GND				11
				7
ZIC1(Vaddis 6E)
ZIC1(Vaddis 6E)				10
TM+	18			6
				4
TM1	17
				20
SP+	15
SP-	16

Fig.13-14

13-10 Samsung Electronics