MX-CFX1 ELECTRICAL SECTION 11 – 4
B. Circuit Detail
(1) Communication Circuit
1) TxD signal
2)
RxD signal
This circuit communicates with the main unit and the finisher.
TxD0 and TxD1 are data signals transmitted from the main unit and the finisher to the inserter. RxD0 and RxD1 are data signals transmitted
from the inserter to the main unit and the finisher. Logical 1 is represented by +5V, and logical 0 is represented by 0V.
(2) Sensor Input Circuits
1) Reverse Sensor (H_SEN)
H_SEN uses the reflective sensor integrated with an LED and a
phototransistor.
The sensor detects a sheet between the sensor and the opposite
reflector interrupting the light path.
The CPU (IC6-Pin94, 95, 96) output is transmitted to the sensor to
light the LED through the D/A converter (IC13), the operational
amplifier (IC15.2), and the transistor (Q1). Meanwhile the signal is
transmitted to the CPU (IC6-Pin30) through the noise filters (R4,
C2) and the comparator (IC1.1).
The signal input to the CPU follows the logic: "H" when a sheet is
detected, "L" when not detected.
The analog signal is transmitted to CPU (IC-Pin105) through no
comparator.
R1 and R10 divide the +5V voltage which is applied to the compar-
ator as the reference voltage.
R13 is used to make the reference voltage have hysteresis.
2) Paper Exit Sensor (HI_SEN)
HI_SEN uses the photointerrupter integrated with an LED and a
phototransistor.
The sensor detects a sheet with the lever actuator interrupting the
light path of the photointerrupter.
The signal is transmitted to the CPU (IC6-Pin106) through the
noise filters (R25,C9).
The signal input to the CPU follow the logic: "L" when a sheet is
detected, "H" when not detected.
Main Unit
F inis her
Main Unit
F inis her
R evers e S ens or
Paper Exit Sensor
Reverse Unit Open/Closed Sensor
Chassis Cover Open/Closed Sensor
Unused
