4-2-1. Block Diagram (Wobble CLV Servo)
47
Disc
Motor uni t Optical
Pick-up
HOP-8511T
IC101
HD153721TF
HPF
S
/
H
-
+
WBLSH
C107
86
87
88
89
95
96
97
98
HPF
AGC2
HPF
BPF
AGC3
HPF
HPF
47
35
WBLSH
21
22
AGC1
23
VREF
WAG1
WAG2
WAG3
SA
SB
SC
SD
MA
MB
MC
MD
+
-
C108
C109
ADO
BCO
IC701
HD62604
M
U
X
P
W
M
SPD
PH
SP
20
Motor Kick
REG
94
C606
R610
SPD
WOBSIG
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.