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MX-FNX4  EXTERNAL VIEWS AND INTERNAL STRUCTURES  4 – 6

Code

Name

Function

FSINDSW

Inlet door switch

Detects inlet door open

FSSD1

Staple sensor (back)

Detects presence of staples 
(back)

FSSHP1

Stitch home position 
sensor (back)

Detects stitch operation home 
position (back)

FSSD2

Staple sensor (front)

Detects staple presence (front)

FSSHP2

Stitch home position 
sensor (front)

Detects stitch home position 
sensor (front)

FSINDSW

FSSD1, FSSHP1

FSSD2, FSSHP2

Code

Name

FSFM

Feed motor

FSFOM

Paper folding motor

FSGM

Guide motor

FPPM

Paper positioning plate motor

FSJM

Alignment motor

FSRSTM

Stitch motor (back)

FSFSTM

Stitch motor (front)

FSLGM

Paper pushing plate motor

FSIFM

Saddle inlet motor

FSFSTM

FSLGM

FSFOM

FSRSTM

FSIFM

FSFM

FSJM

FSGM

FPPM

MX-FNX4  EXTERNAL VIEWS AND INTERNAL STRUCTURES  4 – 7

Code

Name

FS1DFS

No.1 paper deflection plate solenoid

FS2DFS

No.2 paper deflection plate solenoid

FSFCS

Feed plate contact solenoid

FSFS

Saddle inlet solenoid

FS1DFS

FS2DFS

FSFS

FSFCS

No.

Name

1

Saddle stitcher controller PCB

2

Paper sensor PCB

3

Saddle driver PCB

1

2

3

No.

Signal

Name

Type

Function

Output

1

FJPID

Relay entrance sensor

Photo interrupter

Detects paper at the inlet of paper pass unit

Light is interrupted when 
paper is detected

2

FJPOD

Relay pass sensor

Photo interrupter

Detects paper at the outlet of paper pass unit

Light is interrupted when 
paper is detected

3

FJPDD

Relay open sensor

Photo interrupter

Detects opening of the cover of paper pass unit

Light is interrupted when 
the unit is drawn out

4

FJPM

Relay inlet motor

Drives the paper feed rollers

5

FINRPS

Relay flap solenoid

Drives the flapper for switching the route in the finisher and the 
reverse path

6

FJFM

Relay fan 1

Prevents increase in temperature at the inlet of the finisher

7

Relay  PCB

1

4

6

5

2

7

3

MX-FNX4  EXTERNAL VIEWS AND INTERNAL STRUCTURES  4 – 8

Code

Name

FPSHPD

Horizontal registration homeposition sensor

FPE

Punch motor clock sensor

FPHPD

Punch home position sensor

Code

Name

FPUDSW

Upper door switch

FPFDD

Front door switch

FPE

FPSHPD

FPHPD

FPFDD

FPUDSW

Code

Name

FPNM

Punch motor

FPSM

Horizontal registration motor

FSIFM

Punch transportation motor

No.

Name

1

Punch control PCB

2

Photo sensor PCB

3

LED PCB

4

Punch dust full sensor PCB

FPSM

FSIFM

FPNM

2

4

3

1

MX-FNX4  OPERATIONAL DESCRIPTION  5 – 1

MX-FNX4

Service Manual

 

The finisher is designed to deliver copies arriving from its host
machine, and its modes of delivery include simple stacking, job off-
set, and staple.
All operations involved in these modes are controlled by the fin-
isher controller PCB, according to the appropriate commands from
the host machine.
In the case of the Saddle stitch finisher, copies from the host
machine may be routed to the saddle stitch unit.

NOTE: The term job offset refers to shifting each sorting job, sepa-

rating 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 microproces-
sor (CPU), and is used for communication with the host machine
(serial) in addition to controlling the finisher's sequence of opera-
tions.
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 cir-
cuit.
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:
• IC2  (CPU)

Controls sequence of operations/sequence program built-in.

• IC3 (EEP-ROM)

For backup of adjustment values/backup of default data.

• IC28 (Regulator IC)

Generates 5V.

• IC7 (Regulator IC)

Generates 3.3V.

The figure below shows the flow of signals between the finisher and
the optional controller.

Tray drive system

Tray drive system

Control

system

Swing guide drive system

Alignment drive system

Stapler drive system

Delivery drive system

Feed drive system

Shutter drive system

Saddle stitch unit control system

Saddle stitch

controller PCB

Punch controller

PCB

(Punch module(option))

Host machine

(DC controller PCB CPU)

Finisher controller

PCB

IC2

CPU

IC3

EEP-ROM

IC28

Regulator IC

IC7

Regulator IC

Motor

Solenoid

Switch
Sensor