MX-FNX9. MX-FNX9 Service Manual (Complete) - Sharp Copying Equipment Service Manual (repair manual). Page 45

MX-FNX9  ELECTRICAL SECTION  10 – 6

7)

Staple motor (FFSM) drive circuit

This circuit controls rotation/stop and the rotating direction of the staple motor (FFSM), and is composed of the CPU (IC10) and the FET
(Q10, 11, 12, 13). The DC motor is controlled with the staple motor (FFSM) drive normal rotation signal, the reverse rotation signal, and the
brake signal outputted from the CPU (IC10-5, 8, 9pin).
To protect the motor and the mechanism, the current limit circuit is provided, which supplies the motor drive OFF signal when the current
flowing through the detection resistors R78 and R79 exceeds 3.8A, restricting the current not to exceed 3.8A.

8)

Tray motor (FTLM) drive circuit

This circuit controls the tray motor (FTLM) rotation, stop, and
rotating direction, and is composed of the CPU (IC10) and the
DC motor driver IC (IC19). The CPU (IC10-69, 70pin) outputs
the tray motor (FTLM) drive normal rotation signal, the reverse
rotation signal, and the brake signal to control the DC motor. In
addition, the current limiting circuit is formed with R129, R130,
R131, and R132 for the current flowing through the motor not
to exceed 0.65A.

9)

Fan (FFAN) drive circuit

This circuit controls the fan (FFAN) rotation, stop, and rotating
direction, and is composed of the CPU (IC10) and the digital
transistors (Q14, Q18). The DA converter (IC11-13pin) outputs
the fan (FFAN) drive signal to drive the motor. The fan lock sig-
nal is inputted through the noise filter of R168 and C130 to the
CPU (IC10-20pin) by the open drain output of the fan built-in
circuit.
The logic of the signal inputted to the CPU is H when locked.

Staple motor
(FFSM)

Tray motor (FTLM)

Fan (FFAN)