7. Switch input circuit
This circuit checks whether the finisher is connected to the copier,
both the top and front doors are opened. It is connected to micros-
witches whose contacts are closed when the finisher is connected to
the copier or the doors are closed.
Each switch is connected in series from
+
24V so that it becomes a
power supply switch for the drive. That is,
+
24V is conducted only
when all the 3 microswitches are closed.
When the finisher is connected to the copier, the microswitch turns
on, letting
+
24V be applied to ZD4. This allows electric current to flow
to the base resistance of the transistor array TD62504 (IC102), thus
turning on the transistor to change the expansion I/O PG1 (DSW1
signal) to L level.
When the finisher is disconnected from the copier, the transistor is
turned off to change the expansion I/O PG1 to H level. ZD4 (RD6.2E)
has a threshold level preset, to increase detection speed when the
supply of
+
24V is cut off. The levels of PG2 and 3 (DSW2, 3 signals)
also change when the top and front door switch is opened and
closed.
In addition, when
+
24V power supply from the copier is cut off, the
expansion I/O PG0 (PWD signal) level changes at the above circuit.
Here are logic’s at the time of the power supply from the copier being
cut off and the doors opening and closing being detected.
←
Upper Lower
→
Status
Expansion
I/O port
PG0
PG1
PG2
PG3
Remarks
Signal
name
PWD
DSW1 DSW2 DSW3
Power supply from
copier is cut off
H
d.c
d.c
d.c
Disconnected from
copier
L
H
d.c
d.c
Upper door open
L
L
H
d.c
Front door open
L
L
L
H
H:
Power supply cut off (door open)
L:
Conducting (door closed)
d.c: Unknown (no status is shown because power is cut off at
upstream)
PWD1 54
DSW1 55
DSW2 56
DSW3 57
BR7
10K
6
O1
O2
O3
O4
O5
O6
O7
COM
I1
I2
I3
I4
I5
I6
I7
GND
TD62504F
IC102
16
15
14
13
12
11
10
9
PWD1
DS1
DS2
DS3
5
6
7
8
+5V
(IC03)
PG0
PG1
PG2
PG3
RD6.2EB2
ZD05
RD6.2EB2
ZD04
RD6.2EB2
ZD03
RD6.2EB2
ZD06
Power 24V
Copier connection SW
Upper door SW
Front door SW
Microswitch x 3
+24V
+24V1
+24V1
+24V2
+24V2
+24V3
+24V3
to each motor and
solenoid clutch
Upper
Lower
Normal: SW ON
Copier separated
or door open: SW OFF
I/O
2 3 4 5
4
3
2
AR-FN3
8/19/1999
9 – 7
Содержание AR-FN3
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