LG GSA-4163B Service Manual page 45

4-2-1. Block Diagram (Wobble CLV Servo)
Disc
Motor uni t Optical
Pick-up
HOP-7532TS
WBLSH
1.65V
R329
SPD
SPD
R330
C319
1.65V
4-2-2. Wobble CLV Servo
DVD-RAM: 2x, 3x, 5x / DVD-R: 16x(PCAV), 8x, 4x, 2x
/ DVD+R: 16x(PCAV), 8x, 4x, 2.4x
/ DVD-RW: 1x, 2x, 4x, 6x / DVD+RW: 2.4x, 4x, 8x
/ CD-R: 4x, 8x, 16x, 24x, 32x, 40x / CD-RW: 4x, 8x, 10x, 16x, 24x
When drive write DVD-RAM/R/RW/+R/+RW/CD-R/CD-RW, the spindle motor is controlled using Wobble CLV
Spindle Servo.
The WOBSIG signal(HD153724TF 46pin) input to DSP IC(R8J32006FP 56pin). The DSP Controller in
R8J32006FP uses WOBSIG as linear velocity feed back, therefore the Wobble CLV Spindle Servo doesn't
work well when WOBSIG signal is abnormal.
The spindle controller PWM output signal SPD (R8J32006FP 88pin) input to SPIN in Drive IC(R2S30200FP
1pin) after Low-Pass Filtering.
The PWM output signal U,V, W signal(R2S30200FP 12, 13, 14pin) drives Spindle Motor without using a sensor.
SA
85
SB
S
86
/
SC
87 H
SD
88
MA
95
MB
96
MC
97
MD
98
WBLSH
35
IC301
R8J32006FP
P M
88
W U
M X
Motor Kick
C119
WAG1
21 22
ADO
HPF AGC1
HPF
BCO
BPF
IC101
VREF
HD153724TF
REG
C120 C121
WAG2 WAG3
23
-
+
AGC2
HPF AGC3
+
HPF
-
HPF
WOBSIG
46
56
SP
PH
47