4. Spindle Circuit
4-1-1. Block Diagram(FGCAV Servo)
46
Disc
Motor unit
Optical
Pick-up
HOP-8521T
XTALO
Control Clock
Generator
IC701
HD62604
127
M
U
X
P
W
M
SPD
20
Motor Kick
REG
CAV FD
+
CAV PD
SFG
VCK4M
VCK4M
126
R601
C603
1.65V
SPD
IC601
M63041FP
U
V
PRVCTL1
PRVCTL2
VC
1.65
1
20
21
12
13
19
44
SPD
SFG
CTL2
CTL1
SPIN
FG
W
14
XTALI
17
R854
3.3V
X702
33.8688MHz
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(M63041FP 19pin) input to SFG in DSP IC(IC701 17pin).
The spindle controller in DSP IC uses SFG 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 SPD(IC701 20pin) input to SPIN in Drive IC(M63041FP 1pin)
after Low-Pass Filtering.
The PWM output signal U, V, W signal(M63041FP 12, 13, 14pin) drives Spindle Motor without using a sensor,
and FG pulse output is generated as 18 pulses/rotation.