Pioneer DVL-909 Руководство по эксплуатации - Страница 6
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DV-505, DVL-909, DV-S9
1.2 EXPLANATION OF EACH MOVEMENT
1.2.1 Sequence Up to Playback
1.2.2 Focus Servo
FE generated in the RF IC is sent to the
Digital servo IC.
For a DVD, the servo is turned on during
the transition from "Up" to "Down" of
the first-order sine wave. For a CD, it
turns on during the transition from
"Down" to "Up" of the first-order sine
wave.
When the servo is turned on, the level of
PH (the envelope of the bright side of RF)
increases, and DRF becomes H. The
kick-brake pulses, such as those for
FOCUS jump, are also output from pin
49 of IC201.
6
DVD SETUP
RF AGC ON
LD ON
Sweep UP
Down
Focus Lock
Yes
SPDL ACCEL
ATB ON
• FOCUS SERVO
PICKUP
RF
B1
B2
OEIC
B3
B4
FOCUS
COIL
• FOCUS LOCK TIMING
CD
LDON
FDO
FE
DRF
(FOK)
MIRR Modulation
Measurement
T Servo ON
SLDR Servo ON
F Gain Adj.
T Gain Adj.
AFB Adj.
(Auto Focus Bias)
Layer Det.
Lead-in Search
PLAY
PH
3
58
5
IC101
FE
RFIC
6
31
7
LASER
8
13
11 12
22
LD
SGC
MD
1
IC151
FDO
4
DRIVER
2
UP
OEIC GAIN
32
IC201
ADDRESS
35
DIGITAL
&
CONTROL
SERVO IC
BUS
54
44
49
26
DRF
DVD
UP
54
IC501
MECH.
27