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MX-4101N  EXTERNAL VIEW AND INTERNAL STRUCTURE  4 – 5

SPUM

DSPF paper feed motor

Hybrid step motor

Drives the rollers, transport rollers and transport rollers in the paper feed 
section.

SPFM

DSPF transport motor

Hybrid step motor

Drives the transport roller.

SPOM

DSPF paper exit motor

PM step motor

Drives the paper exit roller.

SLUM

DSPF lift-up motor

PM step motor

Lifts up or moves down the paper feed tray.

SPFC

DSPF paper feed clutch

Electromagnetic clutch

Controls ON/OFF of the rollers in the paper feed section.

STRRC

DSPF No.1 resist roller clutch

Electromagnetic clutch

Controls ON/OFF of No. 1 resist roller.

STRC

DSPF transport roller clutch

Electromagnetic clutch

Controls ON/OFF of the transport roller 1.

SRRC

DSPF No.2 resist roller clutch

Electromagnetic clutch

Controls ON/OFF of No. 2 resist roller.

SPFFAN

DSPF cooling fan motor

DC brush-less motor

Cools the motors and the clutches.

DSPF COPY LUMP

DSPF copy lamp

Xenon lamp

Radiates light onto a document to allow the CCD to scan document 
images.

1

DSPF control PWB

Control PWB for DSPF

2

DSPF flash PWB

Program ROM PWB for DSPF

3

DSPF driver PWB

Driver PWB for DSPF

4

DSPF CCD PWB

Scans document images.

5

DSPF CL inverter PWB

Drives the copy lamp.

SPOM

SPUM

SPUM

SPOM

SLUM

SLUM

SPFC

SPFC

STRRC

STRRC

STRC

STRC

SRRC

SRRC

DSPF COPY LUMP

DSPF COPY LUMP

SPFFAN

SPFFAN

SPFM

SPFM

MX-4101N  EXTERNAL VIEW AND INTERNAL STRUCTURE  4 – 6

1

Pickup roller

Feeds paper to the paper feed roller.

2

Paper feed roller

Feeds paper to the paper transport section.

3

Separation roller

Separates paper to prevents against double feed. 

4

U-turn roller

Guide roller to transport paper.

5

PS follower roller

Applies a pressure to paper and the PS roller to give the transport power of the PS roller to the 
paper.

6

PS roller

Synchronizes the document lead edge and the scan start position.

7

Transport follower roller

Applies a pressure to paper and the transport roller to give the transport power of the transport 
roller to the paper.

8

Scan front roller

Transports paper from the PS roller to the scan rear roller.

9

Scan rear roller

Transports paper from the scan front roller to the SWB roller or paper exit roller.

10

Transport follower roller

Applies a pressure to paper and the transport roller to give the transport power of the transport 
roller to the paper.

11

Transport roller in SWB pass section

Transports paper from the SWB roller to the PS rear roller.

12

Transport follower roller

Applies a pressure to paper and the transport roller to give the transport power of the transport 
roller to the paper.

13

Paper exit roller

Discharges paper.

14

Paper exit follower roller

Applies a pressure to paper and the paper exit roller to give the transport power of the paper 
exit roller to the paper.

15

SWB roller

The transport direction is switched back to reverse paper.

16

Transport follower roller

Applies a pressure to paper and the transport roller to give the transport power of the transport 
roller to the paper.

17

Reverse gate

Selects between discharging a document to the paper exit section and transporting a 
document to the reverse tray.

SCOV

RSPF cover switch

Detects the paper feed cover open/close.

Micro switch

SPED

RSPF document empty sensor

Detects document empty in the RSPF tray.

Transmission type

SPLS1

RSPF document length detection short sensor

Detects the document length of the paper feed tray upper.

Transmission type

SPLS2

RSPF document length detection long sensor

Detects the document length of the paper feed tray upper.

Transmission type

SPPD1

RSPF paper entry detection 1 sensor 
(Also used for random detection)

Detects paper entry and detects paper size in random paper feeding.

Transmission type

SPPD2

RSPF paper entry detection 2 sensor (PS front)

Detects the paper in front of the PS roller.

Transmission type

SPPD3

RSPF scan front sensor

Detects the paper in front of scan point.

Transmission type

SPPD4

RSPF reverse gate front sensor

Detects the paper in front of reverse gate.

Transmission type

SPPD5

RSPF reverse rear sensor

Detects reversed paper.

Transmission type

SPWS

RSPF document width sensor

Detects width of document on the tray.

Volume resistor

SOCD

RSPF open/close sensor

Detects open/close of the RSPF.

Transmission type

SOCD

SOCD

SPPD3

SPPD3

SPPD2

SPPD2

SPPD1

SPPD1

SPPD5

SPPD5

SPED

SPED

SPED

SCOV

SPPD4

SPPD4

SPLS1

SPLS1

SPLS2

SPLS2

SPWS

SPWS

MX-4101N  EXTERNAL VIEW AND INTERNAL STRUCTURE  4 – 7

SGS

SPF document exit gate solenoid

Electromagnetic solenoid

Reverses the paper exit guard by ON operation.

SPFC

SPF paper feed clutch

Electromagnetic clutch

Controls ON/OFF of the paper feed roller.

SPFM

SPF transport motor

Stepping motor

Drives the transport roller and the PS roller.

SPRM

SPF paper feed reverse motor

Stepping motor

Drives the roller for paper feeding and drives the SWB transport roller.

SRRC

SPF resist roller clutch

Electromagnetic clutch

Controls ON/OFF of the PS roller.

STMPS

Stamp solenoid

-

Drives the finish stamp.

1

RSPF drive PWB

Drives the RSPF.

SRRC

SRRC

SPFC

SPFC

SPFC

STMPS

SGS

SGS

SPFM

SPFM

SPRM

SPRM

MX-4101N  EXTERNAL VIEW AND INTERNAL STRUCTURE  4 – 8

1

Extension phone socket

When the fax function of the machine is used, an extension phone can be connected to this socket.

2

Telephone line socket

When the fax function of the machine is used, the telephone line is connected to this socket.

3

USB connector (A type)

Supports USB 2.0 (Hi-Speed). This is used to connect a USB device such as USB memory to the machine. This connector 
is not initially available for use. If you wish to use the connector, contact your service technician.

4

LAN connector

Connect the LAN cable to this connector when the machine is used on a network. For the LAN cable, use a shielded type 
cable.

5

USB connector (B type)

Supports USB 2.0 (Hi-Speed). A computer can be connected to this connector to use the machine as a printer. For the USB 
cable, use a shielded cable.

6

Service-only connector

CAUTION: This connector is for use only by service technicians. Connecting a cable to this connector may cause the 
machine to malfunction. 
Important note for service technicians: The cable connected to the service connector must be less than 118" (3 m) in length.

7

Power plug

(3)

(4)

(5)

(6)

(7)

When the fax expansion kit is installed

(1)

(2)