Sharp AR-CF2 (serv.man2) Service Manual ▷ View online
AR-CF2 ELECTRICAL SECTION 9 - 3
C. 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.
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 pho-
totransistor.
totransistor.
The sensor detects a sheet between the sensor and the opposite
reflector interrupting the light path.
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 compar-
ator (IC1.1).
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 compar-
ator (IC1.1).
The signal input to the CPU follows the logic: "H" when a sheet is
detected, "L" when not detected.
detected, "L" when not detected.
The analog signal is transmitted to CPU (IC-Pin105) through no com-
parator.
parator.
R1 and R10 divide the +5V voltage which is applied to the comparator
as the reference voltage.
as the reference voltage.
R13 is used to make the reference voltage have hysteresis.
Main Unit
Finisher
Main Unit
Finisher
Reverse Sensor
AR-CF2 ELECTRICAL SECTION 9 - 4
<2> Paper Exit Sensor (HI_SEN)
HI_SEN uses the photointerrupter integrated with an LED and a pho-
totransistor.
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 fil-
ters (R25,C9).
The signal input to the CPU follow the logic: "L" when a sheet is
detected, "H" when not detected.
R39 is a current limiting resistor for the LED. R34 is a load resistor for
the sensor.
totransistor.
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 fil-
ters (R25,C9).
The signal input to the CPU follow the logic: "L" when a sheet is
detected, "H" when not detected.
R39 is a current limiting resistor for the LED. R34 is a load resistor for
the sensor.
<3> Reverse Unit Open/Closed Sensor (HYK_SEN)
HYK_SEN uses the photointerrupter integrated with an LED and a
phototransistor.
The sensor detects state of the reverse unit with the lever actuator
interrupting the light path of the photointerrupter.
phototransistor.
The sensor detects state of the reverse unit with the lever actuator
interrupting the light path of the photointerrupter.
The signal is transmitted to the CPU (IC6-Pin108) through the noise fil-
ters (R21,C7).
The signal input to the CPU follows the logic: "L" when the reverse unit
is open, "H" when closed.
R37 is a current limiting resistor for the LED. R32 is a load resistor for
the sensor.
ters (R21,C7).
The signal input to the CPU follows the logic: "L" when the reverse unit
is open, "H" when closed.
R37 is a current limiting resistor for the LED. R32 is a load resistor for
the sensor.
<4> Chassis Cover Open/Closed Sensor (KC_SEN)
KC_SEN uses the photointerrupter integrated with an LED and a pho-
totransistor.
The sensor detects state of the chassis cover with the lever actuator
interrupting the light path.
The signal is transmitted to the CPU (IC6-Pin109) through the noise fil-
ters (R29,C11).
The signal input to the CPU follows the logic: "L" when the chassis
cover is open, "H" when closed.
R41 is a current limiting resistor for the LED. R36 is a load resistor for
the sensor.
totransistor.
The sensor detects state of the chassis cover with the lever actuator
interrupting the light path.
The signal is transmitted to the CPU (IC6-Pin109) through the noise fil-
ters (R29,C11).
The signal input to the CPU follows the logic: "L" when the chassis
cover is open, "H" when closed.
R41 is a current limiting resistor for the LED. R36 is a load resistor for
the sensor.
<5> Set Sensor (S_SEN)
S_SEN uses the photointerrupter integrated with an LED and a pho-
totransistor.
The sensor detects the main unit with the lever actuator interrupting
the light path.
The signal is transmitted to the CPU (IC6-Pin2) through the noise fil-
ters (R56,C16).
The signal input to the CPU follows the logic: "H" when the inserter is
connected to the main unit, "L" when not connected.
R59 is a current limiting resistor for the LED. R58 is a load resistor for
the sensor.
totransistor.
The sensor detects the main unit with the lever actuator interrupting
the light path.
The signal is transmitted to the CPU (IC6-Pin2) through the noise fil-
ters (R56,C16).
The signal input to the CPU follows the logic: "H" when the inserter is
connected to the main unit, "L" when not connected.
R59 is a current limiting resistor for the LED. R58 is a load resistor for
the sensor.
<6> Empty Sensor (EMP_SEN)
EMP_SEN uses the photointerrupter including the LED and the pho-
totransistor in one unit.
The sensor detects a sheet with the lever actuator interrupting the light
path.
The signal is transmitted to the CPU (IC6-Pin31) through the noise fil-
ters (R7,C4).
The signal input to the CPU is the following logic: the signal is "H"
when a sheet is detected, "L" when not detected.
R12 is the current limiting resistor for the LED. R11 is the load resistor
for the sensor.
totransistor in one unit.
The sensor detects a sheet with the lever actuator interrupting the light
path.
The signal is transmitted to the CPU (IC6-Pin31) through the noise fil-
ters (R7,C4).
The signal input to the CPU is the following logic: the signal is "H"
when a sheet is detected, "L" when not detected.
R12 is the current limiting resistor for the LED. R11 is the load resistor
for the sensor.
<7> Registration Sensor (REG_SEN)
REG_SEN uses the photointerrupter integrated with an LED and a
phototransistor.
The sensor detects a sheet with the lever actuator interrupting the light
path.
The signal is transmitted to the CPU (IC6-Pin32) through the noise fil-
ters (R14,C5).
The signal input to the CPU follows the logic: "L" when a sheet is
detected, "H" when not detected.
R17 is a current limiting resistor for the LED. R16 is a load resistor for
the sensor.
phototransistor.
The sensor detects a sheet with the lever actuator interrupting the light
path.
The signal is transmitted to the CPU (IC6-Pin32) through the noise fil-
ters (R14,C5).
The signal input to the CPU follows the logic: "L" when a sheet is
detected, "H" when not detected.
R17 is a current limiting resistor for the LED. R16 is a load resistor for
the sensor.
<8> Timing Sensor (TIM_SEN)
TIM_SEN uses the photointerrupter integrated with an LED and a pho-
totransistor.
The sensor detects a sheet with the lever actuator interrupting the light
path.
The signal is transmitted to the CPU (IC6-Pin33) through the noise fil-
ters (R19,C6).
The signal input to the CPU follows the logic: "L" when a sheet is
detected, "H" when not detected.
R18 is a current limiting resistor for the LED. R31 is a load resistor for
the sensor.
totransistor.
The sensor detects a sheet with the lever actuator interrupting the light
path.
The signal is transmitted to the CPU (IC6-Pin33) through the noise fil-
ters (R19,C6).
The signal input to the CPU follows the logic: "L" when a sheet is
detected, "H" when not detected.
R18 is a current limiting resistor for the LED. R31 is a load resistor for
the sensor.
Paper Exit Sensor
Reverse Unit Open/Closed Sensor
Chassis Cover Open/Closed Sensor
Set Sensor
Empty Sensor
Registration Sensor
Timing Sensor
AR-CF2 ELECTRICAL SECTION 9 - 5
<9> Paper Width Detection Potentiometer (T_VR)
T_VR is a potentiometer.
The paper width is detected using the output voltage, which may vary
depending on the potentiometer's knob position.
depending on the potentiometer's knob position.
The signal is transmitted to the CPU (IC6-Pin112) through the noise fil-
ters (R48,C12).
ters (R48,C12).
<10> Tray Sensor (T_SEN)
T_SEN uses the photointerrupter integrated with an LED and a pho-
totransistor.
totransistor.
The sensor detects a sheet with the lever actuator interrupting the light
path.
path.
The signal is transmitted to the CPU (IC6-Pin126) through the noise fil-
ters (R46,C15).
ters (R46,C15).
The signal input to the CPU follows the logic: "L" when a sheet is
detected, "H" when not detected.
detected, "H" when not detected.
R52 is a load resistor for the sensor.
<11> Sub Tray Drawn Detection Sensor (TH_SEN)
TH_SEN uses the photointerrupter integrated with an LED and the
phototransistor in one unit.
phototransistor in one unit.
The sensor detects state of the sub tray with the lever actuator inter-
rupting the light path.
rupting the light path.
The signal is transmitted to the CPU (IC6-Pin127) through the noise fil-
ters (R44,C14).
ters (R44,C14).
The signal input to the CPU follows the logic: "L" when the sub tray is
drawn.
drawn.
R51 is a load resistor for the sensor.
<12> Sub Tray Folded Detection Sensor (TS_SEN)
TS_SEN uses the photointerrupter integrated with an LED and a pho-
totransistor.
totransistor.
The sensor detects state of the sub tray with the lever actuator inter-
rupting the light path.
rupting the light path.
The signal is transmitted to the CPU (IC6-Pin128) through the noise fil-
ters (R42,C13).
ters (R42,C13).
The signal input to the CPU follows the logic: "L" when the sub tray is
folded.
folded.
R50 is a load resistor for the sensor.
<13> JAM Cover Open/Closed Switch (JCK_SW)
JCK_SW is the JAM cover open/closed detection switch using the
microswitch.
microswitch.
+24V is supplied to the switch. The contacts open when the JAM cover
is open.
is open.
When the switch turns on, +24V voltage is applied to the cathode of
ZD2, the base current flows to Q12, and Q12 turns on to transmit the
signal to the CPU (IC6-Pin111).
ZD2, the base current flows to Q12, and Q12 turns on to transmit the
signal to the CPU (IC6-Pin111).
The signal is also used as the +24V conduction signal simultaneously.
The signal input to the CPU follows the logic: "H" when the JAM cover
is open, "L" when closed.
is open, "L" when closed.
The +24V conduction signal follows the logic: "L" when the +24V volt-
age is conducted.
age is conducted.
Paper Width Detection Potentiometer
Tray Sensor
Sub Tray Drawn Detection Sensor
Sub Tray Folded Detection Sensor
AR-CF2 ELECTRICAL SECTION 9 - 6
(3) Motor Drive Circuits
<1> Paper Feed Motor Drive Circuit (K_MOT)
This circuit rotates/stops K_MOT and controls its rotational direction
and the motor current. The circuit consists of the CPU (IC6), the D/A
converter (IC13), the constant-current chopper driver IC (IC9), and
other elements.
and the motor current. The circuit consists of the CPU (IC6), the D/A
converter (IC13), the constant-current chopper driver IC (IC9), and
other elements.
The signals of the stepping-motor drive excitation pattern from the
CPU (IC6-Pin37,38,70,71) control the motor rotation speed and rota-
tional direction.
CPU (IC6-Pin37,38,70,71) control the motor rotation speed and rota-
tional direction.
The analog signal from the D/A converter (IC13-Pin11) is divided into
the constant voltage by R53 and R54. The divided voltage is applied to
IC9-Pin9,11 to set the motor current.
the constant voltage by R53 and R54. The divided voltage is applied to
IC9-Pin9,11 to set the motor current.
<2> Reverse Motor Drive Circuit (H_MOT)
This circuit rotates/stops H_MOTand controls its rotational direction
and the motor current. The circuit consists of the CPU (IC6), the D/A
converter (IC13), the constant-current chopper driver IC (IC7), and
other elements.
and the motor current. The circuit consists of the CPU (IC6), the D/A
converter (IC13), the constant-current chopper driver IC (IC7), and
other elements.
The signals of the stepping-motor drive excitation pattern from the
CPU (IC6-Pin118, 120, 121, 122) control the motor rotation speed and
rotational direction.
CPU (IC6-Pin118, 120, 121, 122) control the motor rotation speed and
rotational direction.
The analog signal from the D/A converter (IC13-Pin5) is divided into
the constant voltage by R74 and R75. The divided voltage is applied to
IC7-Pin3,14 to set the motor current.
the constant voltage by R74 and R75. The divided voltage is applied to
IC7-Pin3,14 to set the motor current.
<3> Transport Motor Drive Circuit (Y_MOT)
This circuit rotates/stops Y_MOT and controls its rotational direction
and the motor current. The circuit consists of the CPU (IC6), the D/A
converter (IC13), the constant-current chopper driver IC (IC8), and
other elements.
and the motor current. The circuit consists of the CPU (IC6), the D/A
converter (IC13), the constant-current chopper driver IC (IC8), and
other elements.
The signals of the stepping-motor drive excitation pattern from the
CPU (IC6-Pin97, 98, 101, 102) control the motor rotation speed and
rotational direction.
CPU (IC6-Pin97, 98, 101, 102) control the motor rotation speed and
rotational direction.
The analog signal from the D/A converter (IC13-Pin6) is divided into
the constant voltage by R76 and R77. The divided voltage is applied to
IC8-Pin3,14 to set the motor current.
the constant voltage by R76 and R77. The divided voltage is applied to
IC8-Pin3,14 to set the motor current.
Not Mounted
Paper Feed MOT
Not Mounted
Reverse MOT
Not
Mounted
Mounted
Horizontal
Transport MOT
Transport MOT
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