Pioneer deh-p980bt Service Manual page 139

1
QQ
The load/eject operation is controlled with the status changes of the HOME switch (also used for clamp detection) on the
3 7 63 1515 0
mechanism unit and the three switches on the control unit. The ON/OFF statuses of these switches are respectively
detected at the input port of the microcomputer.
A
Using the detection results in the microcomputer, each status (A to E) is determined. The disc size detection (8 or 12 cm)
is also performed through this status change. Each status is shown in Fig.1.4.3 and the status change in Fig.1.4.4.
Status
DSCSNS SW1(S903)
8SW SW2(S905)
12SW SW3(S904)
HOME SW4(S901)
Mechanism state
B
Fig.1.4.3 DSCSNS status
LOADING
12cm
C
DSCSNS
TE
L 13942296513
CLCONT
MOTOR
D
8cm
DSCSNS
E
CLCONT
MOTOR
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F
18
1
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2
A
OFF
ON
ON
OFF
With no disc
12EJ
8EJ
HOME
LOEJ
STOP
12EJ
8EJ
HOME
LOEJ
STOP
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2
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3
B C
ON ON
ON OFF
ON ON
OFF OFF
Q Q
3 6 7
LOAD
LOAD
Dead zone
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CX-3164
3
4
2 9 9 4
8
D
ON
OFF
OFF
OFF
Clamp state
SW_ON
SW_OFF
1 3 1 5 0 5 8 2 9
STOP
It changes Load/Carriage
STOP
m
co
.
4
2 8
9 9
E
ON
ON
ON
ON
9 4 2 8 9 9