Sharp AR-FN8 Service Manual page 39

Saddle stitcher
controller PCB
(Saddle Finisher)
Punch driver PCB
(Puncher unit (option))
Host machine
(DC controller PCB CPU)
CHAPTER 2 FINISHER UNIT BASIC OPERATION
Finisher controller
PCB communication
Q1
CPU
Q2
EEP-ROM
Q4
Communication
IC
Q7
EP-ROM
Q8/Q89
RAM
Q14
Regulator IC
Figure 2-102
Motor
Solenoid
Switch
Sensor
2-3