11
CX-890
3) Carriage servo system
Output from low-frequency components (lens position
information) of the tracking equalizer is input to the car-
riage equalizer by the carriage servo. After obtaining a
certain gain, the system outputs drive signal from the
servo LSI. The signal is then applied to the carriage
motor via the driver IC. More specifically, the pickup
unit as a whole must be moved forward when lens off-
set during playback reaches a specified level. Therefore,
gain of equalizer is set so that voltage higher than the
activation voltage of the carriage motor is output. As
actual operation, a certain threshold level is set for
equalizer output in the servo LSI, and drive voltage is
output from the servo LSI only when the equalizer out-
put level exceeds that level. Thus, power consumption
is reduced. Depending on eccentricity, etc. of disc, the
equalizer output voltage may cross the threshold level
several times before the pickup unit as a whole starts
operation. At this time, waveforms of drive voltage
from LSI are output as pulse.
D/A
SD
DRIVER
COP
COM
IC301
BA5986FM
CARRIAGE
MOTOR
IC201 UPD63702AGF
62
27
26
25
16
15
KICK, BRAKE
REGISTERS
DAC
DIGITAL
EQUALIZER
CONTROL
FROM
TRACK
EQUALIZER
M
R305
10k
Ω
R306
7.5k
Ω
CIN
DRIVE ON/OFF THRESHOLD
CARRIAGE MOVED AT THESE POINTS
TRACKING DRIVE
(LOW FREQUENCY)
LENS POSITION
CRG DRIVE
(INSIDE UPD63702AGF)
CRG MOTOR VOLTAGE
Fig. 15 Carriage Servo Circuit
Fig. 16 Carriage Signal Waveforms
Summary of Contents for CDX-MG6056ZH
Page 5: ...4 CDX MG6346ZH MG6446ZH 2 2 EXTERIOR ...
Page 7: ...6 CDX MG6346ZH MG6446ZH 2 3 CD MECHANISM ...
Page 14: ...13 CDX MG6346ZH MG6446ZH 5 6 7 8 5 6 7 8 D C B A A A b A EXTENSION UNIT ...
Page 15: ...14 CDX MG6346ZH MG6446ZH 1 2 3 4 1 2 3 4 D C B A 1 A a A b D CD CORE UNIT STS UNIT A a ...
Page 16: ...15 CDX MG6346ZH MG6446ZH 5 6 7 8 5 6 7 8 D C B A A a A b B 2 B KEYBOARD UNIT A a ...
Page 17: ...16 CDX MG6346ZH MG6446ZH 1 2 3 4 1 2 3 4 D C B A A a A b 1 A EXTENSION UNIT A b ...
Page 18: ...17 CDX MG6346ZH MG6446ZH 5 6 7 8 5 6 7 8 D C B A A a A b 2 A b ...
Page 28: ...27 CDX MG6346ZH MG6446ZH 1 2 3 4 1 2 3 4 D C B A CN701 CN901 EXTENSION UNIT SIDE B A A B D ...
Page 30: ...29 CDX MG6346ZH MG6446ZH 1 2 3 4 1 2 3 4 D C B A SIDE B KEYBOARD UNIT B B ...
Page 32: ...31 CDX MG6346ZH MG6446ZH 1 2 3 4 1 2 3 4 D C B A CD CORE UNIT SERVO UNIT SIDE B C C ...
Page 34: ...33 CDX MG6346ZH MG6446ZH 1 2 3 4 1 2 3 4 D C B A CD CORE UNIT STS UNIT SIDE B D D ...
Page 36: ...M M4 CARRIAGE 1 12 D CN301 35 CDX MG6346ZH MG6446ZH 5 6 7 8 5 6 7 8 D C B A E C ...
Page 38: ...1 41 G CN801 37 CDX MG6346ZH MG6446ZH 1 2 3 4 1 2 3 4 D C B A MOTOR PCB A F SIDE B F D ...