13
CX-961
DETECTION SWITCH STATUS AT THE TIME OF LOAD EJECTION
STATUS
A
B
C
D
E
SW1(S901)
ON
OFF
OFF
OFF
ON
SW2(S902)
OFF
OFF
ON
ON
OFF
SW3(S903)
OFF
OFF
OFF
ON
OFF
SW4(CLAMP SW)
OFF
OFF
OFF
OFF
ON
MECH. STATUS
NO DISK
CLAMP
1.4 Power Supply Loading Unit
This system power supply uses VD (8.3±0.5 V) supplied
from the mother substrate. The VD supply destination
is a 5-ch CD driver IC or 5 V regulator IC. The power
supply used inside the system is the two systems of the
above VD (drive system), and V+5 (control system).
The ON/OFF other than the loading and ejection of the
CD driver is controlled by the microcomputer with
“CONT” and the 5V ON/OFF is controlled by the
microcomputer with “CD5VON”, respectively. For the
ON/OFF of the loading drive, no control terminal is
provided in particular, but input signal “CDEJET” or
“CDLOAD” functions in the same way.
The loading or ejection operation is controlled
according to the state changes of the clamp switch on
the mechanical unit and the three switches on the
control unit. The DSCSNS voltage changes according
to the ON/OFF states of these switches. For this
voltage, each of states (A to E) is judged using the
microcomputer A/D port. An eight/12 cm disk is judged
according to this state transition. Fig. 23 shows each
status and Fig. 24 shows the state transition.
LOP
LOM
LOADING
MOTOR
IC401
BA5811FM
M
9
10
1
2
GND
27
24
CONT 20
CDEJET 11
CD5VON 13
CDLOAD 10
8
7
6
VD
23
28
26
30
29
32
31
PGND
AGND
7
8
PREVCC
VCC
FWD
REV
21
MUTE
19
GND
IC801
BA05SFP
3
1
V+5
CN701
2
4
DSCSNS 21
CLAMP SW
Mechanism Unit
S901
S903
S902
Fig.22:POWER SUPPLY / LOADING SYSTEM CIRCUIT BLOCK
Fig.23:DSCSNS STATUS
