SHARP ARFN2 CIRCUIT DESCRIPTIONS

[11] CIRCUIT DESCRIPTIONS

1. Outline

This circuit controls document transport, reverse, alignment, stapling and discharge.
It is composed of a circuit which controls sensors, switches,and copier signals input, and a circuit which drives the motors and the solenoids, and
CPU, G/C and it peripheral circuits

2. Block diagram

Paper transport

Communication

circuit

Paper reverse
sensor input
circuit

Transport path
entry sensor input
circuit

Address bus

motor drive
circuit

Paper alignment
motor drive
circuit

Paper reverse
motor drive
circuit

Process tray paper
exit sensor input
circuit

Bundle exit sensor
inpout circuit

Accumulation tray
sensor input
circuit

Boomerang
rotation sensor
input circuit

Unit lock sensor 1
input circuit

Unit lock sensor 2
input circuit

Upper cover
sensor input
circuit

Paper alignment
home position
sensor input circuit

Paper level
sensor input
circuit

Data bus

DIP switch push
switch

rush current
limit circuit
+24V

Open/close
switch input
circuit

Power ON
reset circuit

Oscillation
circuit
11MHz

Bin shift motor
drive circuit

Boomerang solenoid
drive circuit

Reverse solenoid
drive circuit

Paddle solenoid
drive circuit

Staple motor
drive circuit

Current limit
circuit

Stapler home
position sensor
input circuit

Staple near end
sensor input circuit

Staple presence
sensor input circuit

Tray rotation
sensor input
ircuit

Tray limit sensor
input circuit

Full stack sensor
input circuit

Power circuit

11 – 1

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
R45 is the current limiting resistor of LED. R67 is the sensor load resistor.

Transport entry port
sensor
(PIS)

[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
R46 is the current limiting resistor of LED. R68 is the sensor load resistor.

® H, Document empty ® L

Transport entry port sensor input circuit

® H, Document empty ® L

Process tray paper
exit sensor
(JTES)

Process tray paper exit sensor input circuit

[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 present.
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
R47 is the current limiting resistor of LED. R69 is the sensor load resistor.

Bundle exit sensor
(BES)

® H, Document empty ® L

Bundle exit sensor input circuit

11 – 2

[d] Full stack sensor (FSS)

FSS is the sensor same as the transport entry port sensor (PIS).
The document full state on the treatment tray is detected by the douser liked with the tray movement. The light path is interrupted when document
full.
The signal is passed to the G/A (IC5-39 pin) through the noise filter of R1 and C3.
Logic of the signal inputted to the G/A: Document tray full detected
R39 is the current limiting resistor of LED. R52 is the sensor load resistor.

Full stack sensor
(FSS)

® H, Document tray full not detected ® L

Full stack sensor input circuit

[e] Tray limit sensor (TLS)

TLS is the sensor same as the transport entry port sensor (PIS).
The tray bottom (limit) is detected by the douser liked with the tray movement. The light path is interrupted when "Limit." The signal is passed to the
G/A (IC5-41 pin) through the noise filter of R4 and C6.
Logic of the signal inputted to the G/A: Limit detected
R40 is the current limiting resistor of LED. R53 is the sensor load resistor.

® H, Limit not detected ® L

Tray Limit sensor
(TLS)

Limit sensor input circuit

[f] Paper level sensor (PLS)

PLS is the sensor same as the transport entry port sensor (PIS).
The paper level on the tray is detected by the lever-system actuator. The light path is interrupted when "Paper level detected." The signal is passed
to the CPU (IC9-75 pin) through the noise filter of R10 and C15.
Logic of the signal inputted to the CPU: Paper level detected
R44 is the current limiting resistor of LED. R66 is the sensor load resistor.

Paper surface sensor
(PLS)

® H, Paper level not detected ® L

paper surface sensor input circuit

11 – 3

[g] Accumulation tray sensor (AS)

AS is the sensor same as the transport entry port sensor (PIS).
The document presence on the tray is detected by the lever-system actuator. The light path is interrupted when paper presence.
The signal is passed to the CPU (IC9-18 pin) through the noise filter of R5 and C7.
Logic of the signal inputted to the CPU: Paper presence
R38 is the current limiting resistor of LED. R49 is the sensor load resistor.

Accumulation tray
sensor
(AS)

® H, Paper empty ® L

Accumulation tray sensor input circuit

[h] Boomerang rotation sensor (BRS)

BRS is the sensor same as the transport entry port sensor (PIS).
The boomerang rotation and home position are detected by the slit plate. The light path is interrupted when in the home position.
The signal is passed to the CPU (IC9-60 pin) through the noise filter of R16 and C19.
Logic of the signal inputted to the CPU: Home position
R48 is the current limiting resistor of LED. R70 is the sensor load resistor.

® H, Rotating ® L

Boomerang rotation
sensor
(BRS)

Boomerang rotation sensor input circuit

[i] Tray rotation sensor (TMMRS)

TMMRS is the sensor same as the transport entry port sensor (PIS).
The rotation of the motor which lifts up and down the tray is detected. Since the encoder is used as the slit plate, pulses are detected during
rotation.
The signal is passed to the G/A (IC5-40 pin) through the noise filter of R2 and C4.
Logic of the signal inputted to the G/A: Light path interrupted
R37 is the current limiting resistor of LED. R50 is the sensor load resistor.

Tray rotation sensor
(TMMRS)

® H, Light path not interrupted ® L

Tray rotation sensor input circuit

11 – 4