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4. Spindle Circuit
4-1-1. Block Diagram (EFMCLV Servo)
Disc
Optical
Motor unit
Pick-up
KRS-340B
1.4V
C153
DMO
SPIN
R146
4-1-2. EFM CLV Servo : 4x, 8x
When drive read PRESS CD at the speed of 4x, 8x, the spindle motor is controlled using EFM CLV Spindle
Servo.
The equalized RFOUT Signal(MT1516 21pin) is generated using RFSUM signal from P/U, and input to DSP IC
(MT1518 45pin) as RFIP.
The spindle controller in MT1518 uses RFOUT signal as linear velocity feedback, therefore the EFM CLV servo
doesn¡fl t work well if RFOUT signal 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.
32
RFSUM
19
-{(A+C)-(B+D)}
IC101
MT1518
P
M
25
W
U
M
X
U
V
W
HV+
HV-
HW+
HW-
IC401
MT1516
G
EQRF
PCK4M
Data
PLL
CLV FD
CLV PD
Motor Kick
REG
9
IC501
11
BD7907
18
C507
3
4
C508
5
6
G
Offset
Adj.
Data
Slicer
PCK4M
+
VCK4M
SPIN
24
VC
27
1.4V
CTL1
22
CTL2
23
C506
1
2
21
FG
MUTE2
101
102
MUTE1
RFOUT
21
OSTCC
13
C430
C410
45
RFIP
44
RFIN
C141
SPIN
MUTE2
MUTE1
HU+
HU-
FG
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