AR-F13 (serv.man2). AR-F13 Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 31

AR-F13 OPERATIONAL DESCRIPTION 4-18

When the host machine is turned on, it supplies the finisher controller PCB with two channels of 24 VDC; one is for the motors and clutches, and the

other is turned into 5 VDC by the regulator IC (IC1) of the finisher controller PCB for use by the sensors and ICs on PCBs.
If a punch unit (option) is installed, power is also supplied to the punch controller PCB.

Some of 24 VDC used to drive motors is cut off when the joint switch (JS), front door switch (FDSW), or stapler safety switch (SSS) is open.

A circuit breaker (CB1) is monitored to protect the 24 VDC system sued to drive the motors against overcurrent. The 24-V system used to drive the

feed motor (FFM), paddle motor (FPM), and delivery motor (FAM) is equipped with a fuse which melts in the presence of overcurrent.

When the host machine is turned on, the puncher unit is supplied by the finisher controller PCB with 24-V and 5-V power.

The 24-V power is used to drive the motors, while the 5-V power is used by sensors and the ICs on the punch controller PCB.

The 24-V power to the motors will be cut off when the joint switch (MS2) or the front door switch (MS1) of the finisher unit is open.
Block diagram for the power supply system:

The 24-V system used to drive the punch motor (FPNM) and the horizontal registration motor (FPSM) is equipped with a built-in fuse which melts in the

presence of overcurrent.

Finisher 
Controller PCB

Punch controller PCB 
(puncher unit; option)

Host

machine

(IC1)

Circuit Breaker

(CB1)

24VP

24VL

Regurator IC

5 V

5 V

24 V

24 V

24 V

Clutch

Motor

Motor

Joint switch

(JS)

Front door switch

(FDSW)

Stapler safety switch

(SSS)

Sensor

Logic system

24 V

5 V

Finisher
controller
PCB

24 V

5 V

5 V

Punch controller PCB

Motors

Sensors

Logic system