Samsung MM-28 Service Manual page 21

5-2-3 Sled Servo Block
The moving of pick-up is controlled by tracking servo output through low pass filter.
The sled kick voltage is output for track jump operation.
5-2-4 Spindle Servo Block
The 20K½ resistor and 0.33µF capacitor form the 200Hz low pass filter, and the carrier component of spindle
servo error signals is eliminated. In CLV-S mode, SMEF becomes ÒLÓ and pin 25 low pass filter fc lowers,
strenthening the filter further. The characteristics of high frequency phase compensation in focus tracking
servo and the characteristics of cut off frequecny in CLV low pass filter are test by FSET pin.
SMON
SMDP
Samsung Electronics
TM6
TM7
X1
X2
X3
X4
22K 22K
24
220K
15K
220K
-
20K
23
+
220K
220K
15K
25
SMEF
-
PS
+
4 3
TM2
0 0
0 1
1 0
1 1
100K
-
50K
Double
speed
6
FSET
Special Circuit Descriptions
43 SLO
SL-
44
42 SL+
46 SPDLO
SPDL-
45
5-7