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3. Operations
A. Sensor input circuit
[a] Transport path entry sensor (PIS)
PIS is a photo interrupter which integrates a light emitting diode and photo transistor. A document from the copier is detected by the lever-system
actuator. The light path is interrupted when document presence.
The signal is passed to the CPU (IC9-61 pin) through the noise filter of R13 and C17.
Logic of the signal inputted to the CPU: Document presence
actuator. The light path is interrupted when document presence.
The signal is passed to the CPU (IC9-61 pin) through the noise filter of R13 and C17.
Logic of the signal inputted to the CPU: Document presence
®
H, Document empty
®
L
R45 is the current limiting resistor of LED. R67 is the sensor load resistor.
[b] Treatment tray exit sensor (JTES)
JTES is the sensor same as the transport entry port sensor (PIS). The document discharged to the treatment tray is detected by the lever-system
actuator. The light path is interrupted when document presence.
The signal is passed to the CPU (IC9-59 pin) through the noise filter of R14 and C18.
Logic of the signal inputted to the CPU: Document presence
actuator. The light path is interrupted when document presence.
The signal is passed to the CPU (IC9-59 pin) through the noise filter of R14 and C18.
Logic of the signal inputted to the CPU: Document presence
®
H, Document empty
®
L
R46 is the current limiting resistor of LED. R68 is the sensor load resistor.
[c] Bundle exit sensor (BES)
BES is the sensor same as the transport entry port sensor (PIS).
The document on the treatment tray is detected by the lever-system actuator. The light path is interrupted when document is pre sent.
The signal is passed to the CPU (IC9-56 pin) through the noise filter of R17 and C20.
Logic of the signal inputted to the CPU: Document present
The document on the treatment tray is detected by the lever-system actuator. The light path is interrupted when document is pre sent.
The signal is passed to the CPU (IC9-56 pin) through the noise filter of R17 and C20.
Logic of the signal inputted to the CPU: Document present
®
H, Document empty
®
L
R47 is the current limiting resistor of LED. R69 is the sensor load resistor.
Transport entry port sensor input circuit
Transport entry port
sensor
(PIS)
sensor
(PIS)
Process tray paper exit sensor input circuit
Process tray paper
exit sensor
(JTES)
exit sensor
(JTES)
Bundle exit sensor input circuit
Bundle exit sensor
(BES)
(BES)
11 – 2
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