AR-CF1 (serv.man3). Finisher unit basic operation - Sharp Copying Equipment Service Manual (repair manual). Page 3

The finisher’s sequence of operation is controlled by the finisher controller PCB. The finisher

controller PCB is a 16-bit microprocessor (CPU), and is used for communication with the host ma-
chine (serial) in addition to controlling the finisher’s sequence of operations.

The finisher controller PCB responds to the various commands coming from the host machine

through a serial communications line to drive solenoids, motors, and other loads. In addition, it com-
municates the finisher’s various states (information on sensors and switches) to the host machine
through a serial communications circuit.

In the case of the Saddle Finisher, the finisher controller PCB not only communicates with the

saddle stitch controller PCB but also communicates the saddle stitch unit’s various states (information
on sensors and switches) to the host machine.

The ICs used on the finisher controller PCB are designed for the following:

●

IC1 (CPU)
Controls sequence of operations.

●

IC2 (EP-ROM)
Backs up adjustment values.

●

IC3
Contains sequence programs.

●

IC6/IC7 (RAM)
Backs up initial setting data.

●

IC4 (communications IC)
Communicates with the host machine and the saddle stitch unit.

●

IC9 (regulator IC)
Generates PWM.

Figure 2-102 shows the flow of signals between the finisher and the options controller.