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4-2-1. Block Diagram (FGCAV Servo)
Disc
Motor unit
1.4V
C153
DMO
SPIN
R146
4-2-2. FG CAV Servo
1) CD 15x CAV : Eccentric CD-R/RW, Video CD, CD-DA
2) CD 32x CAV : (CD-RW)
3) CD 40x CAV : CD-R, CD-RW
4) CD 48x CAV : CD-ROM
When drive read PRESS CD, Closed Session CD-R/RW, the spindle motor is controlled using FG CAV Spindle
Servo. FG signal(BD7907 21pin) input to FGIN in DSP IC(MT1518 20pin).
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(MT1518 25pin) input to SPIN in Drive IC(BD7907 24pin)
after Low-Pass Filtering.
The PWM output signal U, V, W signal(BD7907 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.
Optical
Pick-up
KRS-340B
IC101
MT1518
P
M
25
W
U
M
X
U
V
W
HV+
HV-
HW+
HW-
VCK4M
Control Clock
CAV FD
CAV PD
Motor Kick
REG
9
IC501
11
BD7907
18
C507
3
4
C508
5
6
XTALO
XTALI
Generator
+
VCK4M
SPIN
24
VC
27
1.4V
CTL1
22
CTL2
23
C506
1
2
21
FG
X101
33.8688MHz
74
75
PCK4M
20
R543
3.3V
SPIN
MUTE2
MUTE1
HU+
HU-
FG
33
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