Sharp MX-5500N / MX-6200N / MX-7000N (serv.man24) Peripheral ▷ View online
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)
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.
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.
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.
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.
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.
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
MX-CFX1 ELECTRICAL SECTION 11 – 7
3) Transport Motor Drive Circuit (Y_MOT)
This circuit rotates/stops Y_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
(IC8), and other elements.
tion 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.
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.
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.
4) Flapper Solenoid and Registration Clutch Drive Circuit (F_SOL and R_CL)
This circuit controls the flapper solenoid operation and the registra-
tion clutch engagement.
When the signal F_SOL is "H", Q2 turns on to activate the solenoid.
Similarly, when the signal R_CL is "H", Q3 turns on to engage the
clutch.
tion clutch engagement.
When the signal F_SOL is "H", Q2 turns on to activate the solenoid.
Similarly, when the signal R_CL is "H", Q3 turns on to engage the
clutch.
The flapper solenoid drive signal is the PWM signal. At the begin-
ning of the solenoid activation, the signal is adjusted to set the sole-
noid at 100% duty cycle. After the plunger of the solenoid is pulled
in, the signal is adjusted to set the solenoid at 70% duty cycle in
order to reduce the temperature rise with the plunger hold.
5) Reset Circuit
ning of the solenoid activation, the signal is adjusted to set the sole-
noid at 100% duty cycle. After the plunger of the solenoid is pulled
in, the signal is adjusted to set the solenoid at 70% duty cycle in
order to reduce the temperature rise with the plunger hold.
5) Reset Circuit
The circuit transmits a reset signal to the CPU when the power is
turned on or a power brownout is detected.
The circuit includes a watchdog timer intended to the CPU system
operation diagnosis.
turned on or a power brownout is detected.
The circuit includes a watchdog timer intended to the CPU system
operation diagnosis.
After the power is turned on, normally IC3-Pin8 (*RES) is "H". How-
ever, when the +5V voltage falls to 4.2V or less because of the
power turned off or any trouble, IC3-Pin8 turns "L" to reset the
CPU.
The clock signal from the CPU is transmitted to IC3-Pin3 (CK) at a
regular interval to clear the watchdog timer embedded in IC3. How-
ever, if the clock signal from the CPU disappears because of a sys-
tem trouble, IC3-Pin8 turns "L" to reset the CPU and stop the
system operation.
6)
ever, when the +5V voltage falls to 4.2V or less because of the
power turned off or any trouble, IC3-Pin8 turns "L" to reset the
CPU.
The clock signal from the CPU is transmitted to IC3-Pin3 (CK) at a
regular interval to clear the watchdog timer embedded in IC3. How-
ever, if the clock signal from the CPU disappears because of a sys-
tem trouble, IC3-Pin8 turns "L" to reset the CPU and stop the
system operation.
6)
EEPROM Circuit
This circuit consists of the data storage EEPROM and the periph-
eral circuits.
IC4 is a storage memory for the adjustment settings of the reverse
sensor (reflective sensor) and the paper width detection potentiom-
eter, and passes the data to the CPU through the four-wire serial
interface.
Once data is stored, the data is retained and not cleared even if the
power is turned off.
eral circuits.
IC4 is a storage memory for the adjustment settings of the reverse
sensor (reflective sensor) and the paper width detection potentiom-
eter, and passes the data to the CPU through the four-wire serial
interface.
Once data is stored, the data is retained and not cleared even if the
power is turned off.
Not
Mounted
Mounted
Horizontal
T rans port MOT
T rans port MOT
R egis tration C L
F lapper S OL
Not Mounted
MX-CFX1 ELECTRICAL SECTION 11 – 8
IC4-Pin1 (CS) is the chip selection terminal, and stays "H" during
passing data.
IC4-Pin2 (SK) is the serial clock terminal. The serial data is trans-
mitted synchronizing with the clock signal input to the terminal
passing data.
IC4-Pin2 (SK) is the serial clock terminal. The serial data is trans-
mitted synchronizing with the clock signal input to the terminal
IC4-Pin3 (DI) is the serial data input terminal. IC4-Pin4 (DO) is the
serial data output terminal.
serial data output terminal.
7) Inrush Current Limiting Circuit
system to a certain value or less. The circuit consists of the PTC
thermistor (PTH2) that limits a current and the FET (Q11) that
allows a steady current flowing.
When the JAM cover open/closed detection switch is closed, the
cathode voltage of ZD1 starts rising to the zener voltage according
to the time constant of R55 and C46. During the rise of the cathode
voltage, Q11 is off because no base current to Q10 keeps Q10 off,
and then a current flows to PTH2 to charge the regeneration capac-
itor.
thermistor (PTH2) that limits a current and the FET (Q11) that
allows a steady current flowing.
When the JAM cover open/closed detection switch is closed, the
cathode voltage of ZD1 starts rising to the zener voltage according
to the time constant of R55 and C46. During the rise of the cathode
voltage, Q11 is off because no base current to Q10 keeps Q10 off,
and then a current flows to PTH2 to charge the regeneration capac-
itor.
After the regeneration capacitor is fully charged, and the cathode
voltage of ZD1 reaches over the zener voltage according to the
time constant of R55 and C46, Q11 is turned on because the base
current from ZD1 to Q10 turns Q10 on. And then the current flows
to Q11 instead of PTH2 to release the current limitation. The circuit
consisting of PTH1 and D3 is intended to eliminate the electric
charge accumulated in C46 immediately to limit an inrush current
generated by momentary opening and shutting of the cover.
voltage of ZD1 reaches over the zener voltage according to the
time constant of R55 and C46, Q11 is turned on because the base
current from ZD1 to Q10 turns Q10 on. And then the current flows
to Q11 instead of PTH2 to release the current limitation. The circuit
consisting of PTH1 and D3 is intended to eliminate the electric
charge accumulated in C46 immediately to limit an inrush current
generated by momentary opening and shutting of the cover.
8) Operator Panel Drive Circuit
This circuit includes the input circuits of the switches on the opera-
tor panel and the drive circuits of the LEDs.
The circuits connected to CN15-Pin1, 2, 3 are the input circuits of
the switches on the operator panel. The input signal from the switch
goes "L" when the switch is on, "H" when off.
The circuits connected to CN15-Pin4,6-11 are the drive circuits of
the LEDs on the operator panel. The LED lights when the signal is
"H", does not light when "L".
tor panel and the drive circuits of the LEDs.
The circuits connected to CN15-Pin1, 2, 3 are the input circuits of
the switches on the operator panel. The input signal from the switch
goes "L" when the switch is on, "H" when off.
The circuits connected to CN15-Pin4,6-11 are the drive circuits of
the LEDs on the operator panel. The LED lights when the signal is
"H", does not light when "L".
J AM cover open/clos ed
Operator P anel
MX-CFX1 ELECTRICAL SECTION 11 – 9
9) Operator Panel Circuit
This is the circuit of the operator panel board.
The operator panel drive board turns each of the LED1-6 on or off,
and detects weather each of the PSW1-3 is on or off.
The operator panel drive board turns each of the LED1-6 on or off,
and detects weather each of the PSW1-3 is on or off.
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