Whether detect switch has been closed, if not, the door close action is performed. After detect switch of
door is closed, the machine begins to perform preparations of disc reading and performs panel display
at the same time of working.
Playback process: laser head picks up disc signal from disc, after servo system processing, then
send to decode circuit for decoding, signal after being decoded is saved in SDRAM for the moment.
When machine needs to replay signal, decode circuit calls information inside SDRAM to perform D/A
conversion and then output.
User information storage: information content set by user is saved inside EEPROM, if user does not
refresh or reset this information, it will saved in IC permanently.
Audio, video output circuit: at present, MT1389 all integrates video D/A converter, MT1389E inside
integrates audio D/A converter, manufactures select according to their own needs. Please refer to
circuit principle diagram and audio circuit explanation for details.
4M)), and its servo circuit is mainly composed of front stage signal processing and
digital servo processing, digital signal processing IC MT1389E and drive circuit D5954, in which
MT1389E is also the main composition of decode circuit at the same time, shown in the figure 3.2.2.1:
3.2.2 Servo circuit
Servo system of this player adopts SANYO loader MTK decode solution (MT1389E+FLASH
(16M)+SDRAM (6
FOSO
FMSO
TRSO
DMSO
A B C D E F RFO
IOA
LDO2
LDO2
MD11
Switch circuit
APC circuit
Main axis
control detect
circuit
Main axis
electric
machine
Feed
electric
machine
XS101
D5954
MT1389
Open/close
circuit
TK-
TK+
FC+
FC-
SL+
SL-
SP-
SP+
1
23
6
26
15
16
14
13
17
18
12
11
Figure 3.2.2.1 Servo circuit block diagram
- 17 -
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