Kyocera FS-6020 - Optional Equipment Identification Circuit

FS-6020
2-3-7
(4) Optional equipment identification circuit
SDI/SDO
L
L
L
L
LL
L
L
H
H
L
H
Engine/high voltage PWB (Printer)
SEL0
SEL3
SEL1
SEL2
A
B
Paper feeder 1
Paper feeder 2
Paper feeder 3
Paper feeder 4
A Paper feeder drive PWB (CPU port)
B Duplexer drive PWB (CPU port)
Duplexer
SEL0SDI/SDO SEL1 SEL2 SEL3
CPU(U1)
HHHL
HL HL
LLHL
LLLL
HHL H
Paper feeder 1
Paper feeder 2
Paper feeder 3
Paper feeder 4
Duplexer
SEL0 SEL1 SEL2 SEL3
CPU (U1) output
Optional equipment
to select
Buffer
Inverter (Logical inversion)
Digital
transistor
(Logical
inversion)
SDI/SDO
H
L
L
SEL0
SEL1
SEL2
A
SDI/SDO
L
H
H
H
H
H
SEL0
SEL1
SEL2
SDI/SDO
SEL0
SEL1
SEL2
A
A
Figure 2-3-7 Optional equipment identification circuit
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.