Pioneer PDR-509 Руководство по эксплуатации - Страница 29
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7. CIRCUIT DESCRIPTIONS
7.1 SERVO CIRCUITS
7.1.1 Control Circuit for the Laser Diode
This circuit controls the optical output of the laser diode. It has two
systems of APC circuit that keep the optical output of the laser diode
constant.
One is the APC circuit for playing power of CD/CD-R/CD-RW and
for erasing power while recording on CD-RW, and the other is for
the recording power while recording on a CD-R or CD-RW.
Each adjustment VR is used for the adjustments shown below.
VR101 (VR101) PB.PW
VR102 (VR163) R REC.PW1
VR103 (VR162) R REC.PW2
VR104 (VR141) RW REC.PW0 : CD-RW bias power adjustment
VR106 (VR164) RW REC.PW1 : CD-RW erasing power adjustment
VR105 (VR161) RW REC.PW2 : CD-RW recording power adjustment
( )In the inside, for PDR-509.
The semi-fixed VRs shown above adjusts the points shown in Fig.
7-1 and 7-2.
Fig. 7-1 CD-R recording waveform
Fig. 7-2 CD-RW recording waveform
PDR-555RW, PDR-V500, PDR-19RW, PDR-509
: Playing power adjustment
: CD-R recording power adjustment
: CD-R overdrive adjustment
CD-R
overdrive
VR103
(VR162)
CD-R
recording
power
VR102
(VR163)
Playing
power
VR101
GND
( )In the inside,
for PDR-509.
CD-RW
recording
power
VR105
(VR161)
CD-RW
erasing
power
VR106
(VR164)
CD-RW
bias power
VR104
(VR141)
GND
( )In the inside,
for PDR-509.
7.1.2 Error Signal Generation Circuit
Employing the 3-beam differential push-pull method, the pickup
has a photodetector that divides the main beam in four and two
detectors that divide the subbeam in two. HF, RF, Wobble, focus
error, and tracking error signals are generated from the voltage signal
output.
7.1.3 Focus Servo
The focus servo employs the same astigmatism method as that of
conventional CD players.
The focus signal generated in the RF processor IC (AK8563, IC103-
pin 11) is input to the decoder IC (CXD2585Q, IC353-pin 39).
The signal processed in the IC is output from pins 29 and 30. This
output signal is input to the driver IC (BA5932FP, IC352), and is
used to drive the focus actuator of the pickup.
7.1.4 Tracking Thread Servo
The tracking servo is also the same as that of conventional CD
players.
The tracking error signal generated in the RF processor IC (AK8563,
IC103-pin 10) is input to the decoder IC (CXD2585Q, IC353-pin
41) and CDR servo amplifier IC (PA9004A, IC247-pin 29).
The signal processed in the decoder IC is output from the pins 31
and 32. This output signal is input to the driver IC (BA5932FP,
IC352), and is used to drive the tracking actuator of the pickup.
The signal input to the CDR servo amplifier IC is input to the
mechanism control (IC204-pin 56) as the P-P value for tracking and
used for detecting the tracking error level.
The tracking error signal also functions as the control signal of the
sled.
7.1.5 Spindle Servo
The spindle servo has four modes: Stop, CAV, EFM-CLV and
Wobble-CLV.
The EFM-CLV used for playing a CD is also used for playing a
recorded CD-R or CD-RW. The A, B, C, and D signals that
correspond to the four divisions of the main beam output from the
pickup are generated in IC102 and IC101 as RF signals.
These RF signals are input to the decoder IC (CXD2585Q, IC353-
pin 43). MDP (pin 25) of a triple-value PWM signal from the sync
signal extracted from RF signal and internal standard signal.
When unrecorded parts of a CD-R or CD-RW are played, the rotation
control signal called Wobble is read out from the guide groove of
the disc. This Wobble signal is output from the RF processor IC
(AK8563, IC103-pin 46), runs through the bandpass filter of the
CDR servo amplifier IC (PA9004A, IC247), and becomes the
Wobble-CLV signal in the ATIP decoder IC (PDJ014A, IC205).
In addition to the Wobble servo, the ATIP decoder IC decodes
information, such as ATIP sync, absolute time, recommended
recording power, lead-in area start time, lead-out start time and disc
application code, from the Wobble signal, and sends the information
to the mechanism-control microcomputer.
If a sudden change in the rotation of the spindle motor is required,
such as upon start, stop, and search, FG is read to detect the rotation
of the spindle motor in the servo mechanism assembly for CAV
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