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LG GSA-4040B Service Manual page 45

Super multi dvd drive
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4-2-1. Block Diagram (Wobble CLV Servo)
Disc
Motor uni t Optical
Pick-up
HOP-8511T
WBLSH
C606
SPD
SPD
20
R610
4-2-2. Wobble CLV Servo
DVD-RAM: 2x, 3x / DVD-R: 4x, 2x, 1x / DVD+R: 4x, 2.4x / DVD-RW: 1x, 2x
/ DVD+RW: 2.4x / CD-R 4x, 8x, 12x, 16x, 20x, 24x / CD-RW: 4x, 8x, 12, 16x
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(HD153721 47pin) input to DSP IC(HD62604 94pin). The DSP Controller in HD62604 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 (HD6260420pin) 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.
SA
86
SB
S
87
/
SC
88
H
SD
89
MA
95
MB
96
MC
97
MD
98
WBLSH
IC101
35
HD153721TF
IC701
HD62604
P
M
W
U
M
X
Motor Kick
REG
C107
WAG1
21 22
ADO
HPF
AGC1
HPF
AGC2
BCO
BPF
VREF
C108
C109
WAG2
WAG3
23
-
HPF
+
HPF
AGC3
+
HPF
-
WOBSIG
47
94
SP
PH
47

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