9
CX-890
2) Tracking servo system
The main equalizer of tracking servo is located in the
UPD63702AGF. Fig. 11 shows block diagram of the
tracking servo.
a) Track jump
Track jump is automatically performed by the auto
sequence function in LSI when the LSI accepts com-
mand. The system has six types of jump (1, 4, 10, 32,
32x2, and 32x3) for truck jump during searching. In Test
mode, the system can select and check these jump
types and CRG move by selecting a mode. The micro-
computer sets half of the total number of track jumps
(two tracks if the total number of tracks are four), and
counts the set number of tracks by using TEC signal.
The system outputs brake pulse for a specified time (set
by the microcomputer) from the point of time when the
set number is counted, and stops the lens. Thus, track-
ing is closed, and the system can continue normal play-
back.
To improve servo withdrawal during track jump, the
system sets the brake circuit to ON for 60 ms after
brake pulse so that gain of the tracking servo can be
increased.
FF/REV in normal mode is made by continuously per-
forming single jump approximately ten times faster
than in normal playback.
TRACKING
ERROR
D/A
TD
TIN
DRIVER
TOP
TOM
IC301
BA5986FM
LENS
IC 201 UPD63702AGF
77
11
12
JUMP
PARAMETERS
DAC
DIGITAL
EQUALIZER
CONTROL
A/D
5
7
6
R303
10k
Ω
R304
27k
Ω
63
t1
t2
GAIN NORMAL
TIN
KICK
BRAKE
TEC
T. BRAKE
EQUALIZER
T. SERVO
CLOSED
OPEN
NORMAL
GAIN UP
OFF
ON
t1
TIN
TEC
(10 TRACK)
EQUALIZER
T. BRAKE
SERVO
CIN
2.8mS (4.10 TRACK JUMP)
5.8mS (32 TRACK JUMP)
GAIN UP
NORMAL
ON
OFF
OPEN
CLOSED
t2
60mS
t
Fig. 11 Tracking servo block diagram
Fig. 12 Single track jump
Fig. 13 Multi track jump
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 ...