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

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

b. Motor drive circuit
1)

Punch horizontal resist motor (FPSM) drive circuit

This circuit controls the punch horizontal resist motor (FPSM) rotation/stop, the rotating direction, and the motor current, and is composed
of the CPU (IC10) on the finisher circuit, the DA converter (IC11), and the constant-current chopper type driver IC (IC2) in the above circuit.
The stepping motor drive excitement pattern signal (YI_MOT_PA, PB, EA, EB) outputted from the CPU (IC10-83, 84, 85, 86pin) is used to
control the motor rotating speed and the rotating direction.
The analog signal (YI_MOT_REF) outputted from the DA converter (IC11-6pin) is divided to a fixed voltage with R17 and R18. This divided
voltage is inputted to IC2-3, 4pin to set the motor current value. The logic of the standby signal (MOT_STY) outputted from the DA con-
verter (IC11-7pin) is H when the motor can be operated.

2)

Punch motor (FPNM) drive circuit

This circuit controls the punch motor (FPNM) rotation/stop, and the rotating direction, and is composed of the CPU (IC10) on the finisher
circuit and the FET (Q1, 2, 3, 4). The CPU (IC10-98,99,100pin) outputs the punch motor (FPNM) drive forward rotation signal, the reverse
rotation signal, and the brake signal to control the DC motor.

Punch horizontal resist motor
(FPSM)

Not installed

Punch motor (FPNM)