MX-CFX1 ELECTRICAL SECTION 11 – 6
9) Tray Sensor (T_SEN)
T_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-Pin126) through the
noise filters (R46,C15).
The signal input to the CPU follows the logic: "L" when a sheet is
detected, "H" when not detected.
R52 is a load resistor for the sensor.
10) JAM Cover Open/Closed Switch (JCK_SW)
JCK_SW is the JAM cover open/closed detection switch using the
microswitch.
+24V is supplied to the switch. The contacts open when the JAM
cover 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).
The signal is also used as the +24V conduction signal simulta-
neously.
The signal input to the CPU follows the logic: "H" when the JAM
cover is open, "L" when closed.
The +24V conduction signal follows the logic: "L" when the +24V
voltage is conducted.
(3) Motor Drive Circuits
1) Paper Feed Motor Drive Circuit (K_MOT)
This circuit rotates/stops K_MOT and controls its rotational direc-
tion 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
rotational 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.
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.
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.
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.
Not Mounted
P aper F eed MOT
Not Mounted
R evers e MOT
