Samsung MAX-670, Service Manual

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5-1-5 Motor Drive(LB1649) : UIC4
22 23
40
41
39
47
48
7
15
16
54
52
50
51
0.022UF
TZC
0.047UF
150K
BPF
1K
1K
TZC
100K
ATC
20K
TE 1
TE2
470K
100K
ATS
TDFC1 0.1UF
680K
66PF
10K
DFCT
0.1UF
RTG
20K
TGSW
470K
TG2
82K
110K
PHASE
COMPENSATION
S STOP
1K
100K
S STOP
SLED
SLEI
SLEN
10K
56K
100K
ISET VREG
180K
SLED
DRIVER
120K
100K
TKEO
TKEI
TM2
TM6
TM5
TM4
5.5U
TM3
5.5U
10K 90K
TM7
PFSET
470K
8
TRACKING
COIL
5-2
Special Circuit Descriptions
Samsung Electronics
10 3
OUT1 OUT2
VCC1
1
IN 1
Fin
11
2
IN 2
12 6
VZ1
VZ2
IN3
5
IN4
8
7
VCC2
9
4
OUT3 OUT4
Input Logic Input Logic
Pre-Driver
Pre-Driver
IN 1 2 OUT1 OUT2
0 0 L L
1 0 H L
0 1 L H
1 1 L L
IN 3 IN 4 OUT3 OUT4
0 0 L L
1 0 H L
0 1 L H
1 1 L L
5-1-4 Tracking Sled Servo System (KA9220) : WIC01
The capactor between pin 15 and 16 attenuates the high frequency when TG2 is off. The maximum frequency of
tracking phase compensation is inversely proportional to the resistance connected to pin 7 (about 1.2kHz at 470k).
The tracking jump (FWD and REV) is decided when TM3 and TM4 are ON, and the peak voltage induced from
tracing coil is decided by the both TM3 and TM4 current values and feed back resistance of pin 47.
Track jump max voltage = TM3 (TM4) current x feedback resistance.
FWD or REV sled kick occnrs when TM5 or TM6 is ON, and the peak voltage added to sled motor is decided by
TM5 or TM6 current and the feedback resistance of pin 41.
Sled jump max. voltage = TM5(TM6) current x feedback resistance
Each SW current is decided by the resistance connected to pin 22 and 23.
When the resistance is about 150½,
TM3
or
TM4
=
11µA,
TM5
or
TM6
=
22µA,
This current is inversely proportional to the resistor, variable within a range of t 5 to 40 µA for TM3.
STOP is the ON/OFF detection signal for the limit SW (or the sled motor's innermost cirumference).