Outline Of Electrical Circuitry - Sharp AR-FN8 Service Manual

CHAPTER 2 FINISHER UNIT BASIC OPERATION
B.

Outline of Electrical Circuitry

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
machine (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
communicates the finisher's various states (information on sensors and switches) to the host ma-
chine through a serial communications circuit.
In the case of the Saddle Finisher, the finisher controller PCB not only communicates with the
saddle stitcher controller PCB but also imparts the saddle stitcher 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:
Q1 (CPU)
Controls sequence of operations.
Q2 (EEP-ROM)
Backs up adjustment values.
Q7
Contains sequence programs.
Q8/Q89 (RAM)
Backs up initial setting data.
Q4 (communications IC)
Communicates with the host machine and the saddle stitcher unit.
Q14 (regulator IC)
Generates 5V.
Figure 2-102 shows the flow of signals between the finisher and the options controller.
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