Kyocera FS-1800 Service Manual page 110

The interlock circuit outputs the three different detection signals which are combined in matrix to
produce various levels of situations regarding the covers. The subsequent status is displayed on the
message display.
Top cover
N.O.
Top cover/
paper feed
unit interlock
COM
switch (SW702)
Side cover
GND
COM
Side cover interlock
switch (SW703)
N.O.
N.C.
Ready
Top cover open
Top cover open
Top cover open
Top cover open
Feed open
Feed open
Side cover open
NOTE: Message display priority is from left to right.
Actuator
N.C.
Top cover
switch (SW701)
Operator panel message display
Feed open
Side cover open
Feed open
Side cover open
Figure 4-3-12 Interlock circuit
Paper feed unit
A
H
L
L
L
L
Side cover open
L
L
L
4-35
Engine board
+24V1
+5V2
GND
+24V2
GND
GND
Output level
B C
L H
H L
H L
H L
H L
L L
L L
L H
FS-1800/1800N | FS-3800/3800N
Engine
gate
array
(U204)
B
C
A