MX-PNX1C (serv.man12). Section 10 - Electrical Section . - Sharp Copying Equipment Service Manual (repair manual). Page 7

MX-FNX1/MX-PNX1  ELECTRICAL SECTION  10 – 7

This circuit controls attachment and release of the flapper solenoid (FINRPS), the belt separation solenoid (FBRS), the paper surface detection
solenoid (FSLS), and the paddle one-rotation solenoid (FPDS).
The CPU (IC10-24, 26) outputs the drive signal of the flapper solenoid (FINRPS) and the paddle one-rotation solenoid (FPDS) to turn ON Q23
and Q20 to attach the solenoid.
The CPU (IC10-27,28) outputs the drive signal of the belt separation solenoid (FBRS) and paper surface detection solenoid (FSLS) to turn on
Q19 and Q22 to attach the solenoid.
The drive signal of the flapper solenoid (FINRPS) and the paper surface detection solenoid is a PWM signal. After completion of attachment,
the flapper solenoid (FINRPS) duty is 20%. Paper surface detection solenoid (FSLS): Duty is reduced to 50% and the solenoid temperature
rise is reduced to keep attachment.

This circuit generates the reset signal and supplies it to the CPU
when the power is turned ON and when the power voltage fall is
detected.
IC13-6pin (OUT) is normally at HIGH level after turning ON the
power. When, however, +5V power voltage falls to 4.05V or less
because of power OFF or any other reasons, IC13-6pin is driven to
LOW level, resetting the CPU.

This circuit is composed of EEPROM which stores data and the
peripheral circuit.
IC12 is a memory which stores the adjustment values of the inner
punch transmission-type optical sensor and the alignment plate
position, and it sends/receives data to/from the CPU through the 4-
wire type serial interface. The data stored once are kept undeleted
even when the power is turned OFF.
IC12-1pin (CS) is the chip select pin and is at HIGH level when
data are sent or received.
IC12-2pin (SK) is the serial clock pin. Serial data are inputted to
this pin and sent in synchronization with the clock.
IC12-3pin (DI) is the serial data input pin, and IC12-4pin (DO) is the
serial data output pin.

Flapper solenoid
(FINRPS)

Paddle one-rotation
solenoid (FPDS)

Paper surface detection
solenoid (FSLS)

Belt separation solenoid
(FBRS)

Not
installed