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I.

BASIC OPERATION .................... 2-1

A. Outline ....................................... 2-1
B. Outline of Electrical Circuitry ...... 2-2
C. Inputs to and Outputs from the

Finisher Controller PCB ............. 2-4

II.

FEED/DRIVE SYSTEM ............. 2-10

A. Outline ..................................... 2-10
B. Type of Delivery Paths ............. 2-15
C. Feeding and Delivering ............ 2-18
D. Job Offset ................................ 2-21

E. Staple Operation ...................... 2-24
F. Stapler Unit .............................. 2-32
G. Tray Operation ......................... 2-38
H. Detecting the Height of

Stack on the Tray ..................... 2-40

I.

Shutter Operation .................... 2-42

J. Buffer Path Operation .............. 2-46
K. Detecting Jams ........................ 2-51

III. POWER SUPPLY SYSTEM ....... 2-56

1. This chapter discusses the purpose and role of each of the finisher’s functions, and the prin-

ciples of operation used for the finisher mechanical and electrical systems. It also explains the
timing at which these systems are operated. The 

 symbol in drawings indicates transmis-

sion of mechanical drive, and signals marked by 

 together with the signal name indicates

the flow of electrical signals.

2. In descriptions of digital circuits on the finisher, “1” indicates a high signal voltage level, while

“0” indicates a low signal voltage level. Voltage values differ according to circuit.

A microprocessor is used on the finisher. A description of microprocessor operation is omitted
in this chapter as it is practically impossible to check internal operation of the microprocessor.

Descriptions in this chapter also assume that PCBs will not be repaired at user sites. For this
reason, descriptions of circuits on PCBs is limited to block diagrams. Two types of block dia-
grams are provided for separate functions: diagrams indicating details from sensors up to input
sections of major PCBs, and diagrams indicating details from the output sections of major
PCBs up the loads.

The finisher is designed to deliver copies arriving from its host machine, and its modes of

delivery include simple stacking, job offset

 (Note)

, and staple.

All operations involved in these modes are controlled by the finisher controller PCB, according

to the appropriate commands from the host machine.

In the case of the Saddle Finisher, copies from the host machine may be routed to the saddle

stitch unit.

Swing guide drive system

Alignment drive system

Stapler drive system

Delivery drive system

Feeder drive system

Shutter drive system

Tray drive system

Tray drive system

Saddle stitch unit control system
(Saddle Finisher)

Control system

The term job offset refers to shifting each sorting job, separating a single
stack into several stacks.

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 stitch controller PCB but also communicates the saddle stitch unit’s various states (informa-
tion 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.

IC1

CPU

IC2

EEP-ROM

IC4

IC

IC3

EP-ROM

IC6/IC7

RAM

IC9

Saddle stitch 
controller PCB
(Saddle Finisher)

Punch driver PCB
(Puncher unit (option))

Host machine
(DC controller PCB CPU)

Finisher controller 
PCB communication

Regulator IC

Connecting with inserter

Motor

Solenoid

Switch

Sensor

IC1

CPU

IC2

EEP-ROM

IC4

IC

IC3

EP-ROM

IC6/IC7

RAM

IC9

Saddle stitch 
controller PCB
(Saddle Finisher)

Punch driver PCB
(Puncher unit (option))

Inserter driver PCB
(Inserter unit (option))

Host machine
(DC controller PCB CPU)

Finisher controller 
PCB communication

Regulator IC

Motor

Solenoid

Switch

Sensor