Read Sharp AR-CF2 (serv.man2) Service Manual online
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
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