Electrical Circuitry - Sharp AR-FN8 Service Manual

CHAPTER 3 SADDLE STITCHER UNIT BASIC OPERATION
B.

Electrical Circuitry

The sequence of operations used for the saddle stitcher is controlled by the saddle stitcher
controller PCB. The saddle stitcher controller PCB has a microprocessor. This microprocessor is
used to control the sequence of operations and to handle serial communications with the finisher
controller PCB, driving solenoids and motors in response to the various commands from the fin-
isher controller PCB.
The saddle stitcher controller PCB is also used to communicate the state of various sensors and
switches to the finisher controller PCB in serial.
The functions of the major ICs mounted on the saddle stitcher controller PCB are as follows:
Q1
Controls the sequence of operations.
Q2
Contains the sequence program.
Q3
Controls the sequence of operations.
Q4
Handles IPC communications.
Electrical circuitry block diagram
Sensor
Switch
3-2
Saddle stitcher
controller PCB
Q1 CPU
Q2
ROM
Q3
RAM
Q4
Communi-
cations IC
Finisher controller
PCB
Figure 3-102
Motor
Solenoid
Host machine