Sharp AR-SS2 Service Manual page 29

2) Alignment operation
The alignment operation of the guide bar is performed every time
when copy paper is discharged. When stapling is made, it holds copy
paper.
Paper size
3) Guide bar oscillation motor (M3) control
The control circuit of the guide bar oscillation motor (M3) is shown
below.
The guide bar oscillation motor is a stepping motor of 4-phase con-
trol.
The sorter controller PWB sends drive pulses (GBMA, GBMA
∗
GBMB, GBMB ) to the motor driver.
The motor driver controls the output timing of the pulse signals (A,
∗ ∗
A , B, B ) according to each signal to turn ON/OFF the guide bar
oscillation motor and switch the rotating direction.
When the guide bar oscillation motor (M3) is held, the output timing of
∗ ∗
the pulse signals (A, A , B, B ) is fixed.
The fuse (ICP2) breaks the power supply circuit when an overcurrent
flows through the circuit to stop the guide bar oscillation motor (M3).
Sorter controller PWB
GBMA
GBMA*
GBMB
Q1 GBMB*
CPU
(4) Bin paper sensor
1) Outline
The bin paper sensor is composed of the LED and the photo transis-
tor. It detects paper in the bin.
This machine executes the paper detection level correction automat-
ically and periodically to prevent against malfunctions due to light
quantity change in each sensor.
Note: When the sensor light receiving section (S2) is exposed to
external lights during correction of the paper detection level,
an erroneous correction value is stored. In such a case,
"E525" is displayed on the operation panel of the copier during
the normal operation.
Guide bar
+24V
Guide bar
ICP2
A
drive motor
M3
∗
Q34
A
Motor
B
driver
∗
B
PI3
GBHP
Guide bar home
position sensor
Bin unit
Bin paper sensor
Light
emitting
section
Light
∗
, receiving
section
(5) Other sensors
1) Bin unit lower limit sensor (Home position sensor)
The bin unit returns to the home position when the copy start key is
pressed ON or when all the paper in the bins are removed.
In that case, the actuator section integrated with the bin unit passes
over the bin unit lower limit sensor (PI4) to turn on the sensor, send-
ing signals to the CPU of the sorter controller PWB.
When the bin unit is falling further from the home position, the lead
cam home position sensor turns OFF to detect the lower limit. The
sorter controller PWB immediately stops the bin shift motor (M1) drive
and displays the error code on the operation panel of the copier at the
same time.
2) Bin unit upper limit sensor
The bin unit upper limit detection is performed by the actuator section
integrated with the bin unit and the bin unit upper limit sensor (PI5).
When any abnormality occurs and the bin unit moves up further from
the 20th bin, the actuator section passes over the upper limit sensor
to turn on the sensor, sending signals to the CPU of the sorter con-
troller PWB. It immediately stops the bin shift motor (M1) drive and
displays the error code on the operation panel of the copier at the
same time.
Reset
Turn off the copier power and turn on again.
9 – 10
AR-SS2
LED(S1)
Photo transistor (S2)
Sorter controller PWB
+5V
Q16
Lower limit
sensor (PI4)
Upper limit
sensor (PI5)
Actuator section