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Spindle Circuit - LG GSA-4040B Service Manual

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4. Spindle Circuit

4-1-1. Block Diagram(FGCAV Servo)
Disc
Motor unit
DMO
SPIN
R610
C606
4-1-2. FG CAV Servo
1) CD 24x CAV : CD-RW
2) CD 32x CAV : CD-R, CD-ROM
3) DVD 8x CAV : DVD+RW, DVD+R, DVD-ROM dual
4) DVD 12x CAV : DVD-ROM(single)
When drive read PRESS CD, Closed Session CD-R/RW, the spindle motor is controlled using FG CAV Spindle
Servo. FG signal(BD7905 21pin) input to FGIN in DSP IC(IC701 17pin).
The spindle controller in DSP IC uses FGIN as spindle rotation frequency feedback, therefore the FG CAV
Spindle Servo doesn't work well if FG generation is abnormal.
The spindle controller PWM output signal DMO(IC701 20pin) input to SPIN in Drive IC(BD7905 24pin)
after Low-Pass Filtering.
The PWM output signal U, V, W signal(BD7905 9,11,18) drives Spindle Motor using Hall Sensor Output signal
(HU+, HU-, HV+, HV-, HW+, HW-) and SPIN, and FG pulse output is generated as 18 pulses/rotation.
46
Optical
Pick-up
HOP-8511T
IC701
HD62604
P
M
20
W
U
M
X
U
V
W
HV+
HV-
HW+
HW-
VCK4M
Control Clock
CAV FD
CAV PD
Motor Kick
REG
9
IC601
11
BD7905
18
C602
3
4
C603
5
6
XTALO
XTALI
Generator
+
VCK4M
SPIN
24
VC
27
1.65
CTL1
22
CTL2
23
C601
1
2
21
FG
X702
33.8688MHz
126
127
SFG
17
R854
3.3V
SPIN
MUTE2
MUTE1
HU+
HU-
SFG

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