Optional Equipment Identification Circuit - Kyocera Mita FS-6020 Service Manual

(4) Optional equipment identification circuit

Engine/high voltage PWB (Printer)
SDI/SDO
SDI/SDO
SDI/SDO
SDI/SDO
SDI/SDO
The CPU (U1) of the engine/high voltage PWB outputs four optional equipment selection signals (SEL0-4) and specifies the
4 paper feeders and duplexer.
When it is required that the CPU (U1) of the engine/high voltage PWB controls the specified paper feeder or checks if the
paper feeder is equipped, the combination of the selection signal (The illustration shows the selection case when the paper
feeder 3 is selected), which is determined per paper feeder, is output. The combination to be input per stacked paper feeder
will be different because crossing of signal leads and logical inversion are executed in the circuit of each paper feeder drive
PWB. The CPU of the paper feeder drive PWB is programmed to react only when the level of SEL0-4 signal is input in
combination of (SEL0=H, SEL0=H, SEL0=L) and reply to the CPU (U1) of the engine/high voltage PWB. Consequently, the
CPU (U1) judges that the paper feeder on the level in question is not equipped if the said paper feeder does not reply even
if the CPU (U1) output the SEL0-4 signal to the paper feeder to be specified. Only the duplexer will be selected when the
SEL3 signal is set as H level.
CPU(U1)
SEL0 SEL1 SEL2
L L H
Buffer
L L L
L
SEL2
L
SEL1
L
SEL0
A
L
SEL2
L
SEL1
H
SEL0
A
L
SEL2
H
SEL1
H
SEL0
A
H
SEL2
H
SEL1
H
SEL0
A
Figure 2-3-7 Optional equipment identification circuit
Optional equipment
to select
SEL3
Paper feeder 1
L
Paper feeder 2
Digital
Paper feeder 3
transistor
(Logical
Paper feeder 4
inversion)
H
Duplexer
H
SEL3
Paper feeder 1
Paper feeder 2
Inverter (Logical inversion)
A Paper feeder drive PWB (CPU port)
B Duplexer drive PWB (CPU port)
Paper feeder 3
Paper feeder 4
CPU (U1) output
SEL0 SEL1 SEL2 SEL3
H H H
H L H
L L H
L L L
H H L
Duplexer
B
FS-6020
L
L
L
L
H
2-3-7