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AR-FN3
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.
Power supply +24V
Upper
Copier connection SW
Upper door SW
Lower
Front door SW
Microswitch x 3
Normal: SW ON
Copier separated
or door open: SW OFF
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
Expansion
PG0
I/O port
Status
Signal
PWD
name
Power supply from
H
copier is cut off
Disconnected from
L
copier
Upper door open
L
Front door open
L
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)
8/19/1999
ZD05
RD6.2EB2
+24V
ZD04
+24V1
RD6.2EB2
+24V1
ZD03
+24V2
RD6.2EB2
+24V2
ZD06
+24V3
RD6.2EB2
+24V3
to each motor and
solenoid clutch
Lower→
PG1
PG2
PG3
Remarks
DSW1 DSW2 DSW3
d.c
d.c
d.c
H
d.c
d.c
L
H
d.c
L
L
H
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.
+5V
IC102
2 3 4 5
PWD1
16
I1
O1
DS1
2
15
I2
O2
DS2
14
3
I3
O3
DS3
4
13
I4
O4
5
12
I5
O5
6
11
I6
O6
7
10
I7
O7
8
9
GND
COM
TD62504F
9 – 7
BR7
10K 6
PWD1 54
PG0
DSW1 55
PG1
DSW2 56
PG2
DSW3 57
PG3
I/O
(IC03)
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