MX-FN30, MX-FN31. Service Manual (Revised February 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 92

MX-FN30/FN31  Technical Explanation 3K Finisher  6 – 36

Detection of paper jam depends on whether there is a paper around a sensor area at check timing preliminarily stored to finisher controller PWB and
saddle stitcher controller PWB.
Once either finisher controller PWB or saddle stitcher controller PWB detects paper jam, the machine pauses the paper transportation and discharg-
ing of the paper.
At the same time, the paper jam is notified to the devices being connected.

FNE_N

Entrance paper sensor time-
out JAM

Entrance paper sensor is not turned on when a paper is transported by the "distance between entrance of the finisher 
and entrance sensor plus margin (200 mm)" after reception of signal on discharge of a paper from main unit (right 
before the entrance of lead edge of a paper into finisher)

FNE_S

Entrance paper sensor 
remaining JAM

Entrance paper sensor is not turned off when a paper is transported by 50 mm plus 80 mm from 50 mm before the 
rear edge of a paper.

FNTBP_N

Paper exit sensor time-out 
JAM

Paper exit sensor is not turned on when a paper is transported by the “distance to paper exit sensor plus margin (50 
mm)” after lead edge of the paper reached to the entrance paper roller.

FNTBP_S

Paper exit sensor remaining 
JAM

Paper exit sensor is not turned off when a paper is transported by the “distance to paper exit sensor plus margin (80 
mm)” after trail edge of the paper passing through the entrance paper roller and additionally transported by 15 mm.

FNB_N

Buffer sensor time-out JAM

Buffer sensor is not turned on when a paper is transported by the “distance to buffer sensor plus margin (50 mm)” 
after lead edge of the paper reached to the buffer switchback position.

FNB_S

Buffer sensor remaining JAM

Buffer sensor is not turned off after transporting a paper by the “distance to buffer sensor plus margin (80 mm)” after 
trail edge of the paper reached to the buffer path switchback position.

FNEE_N

The first escape delivery 
sensor time-out JAM

Escape delivery sensor is not turned on when a paper is transported by the “distance to escape delivery sensor plus 
margin (50 mm)” after lead edge of the paper reached to the escape middle roller.

FNEE_S

The first escape delivery 
sensor remaining JAM

Escape delivery sensor is not turned off when a paper is transported by the “distance to escape delivery sensor plus 
margin (80 mm)” after trail edge of the paper reached to the escape middle roller and additionally transported by 15 
mm.

FNSSS

Safety switch actuation Jam

First detection of safety switch activation trouble after power-on
Same trouble is detected intermittently afterward.
*Safety switch actuation trouble if detected in a raw.

FNMOTERR

Motor trouble JAM

The following status do not change after 60 seconds:
Initialization of machine, preparation for a job, waiting for paper transport, finishing of a job, manual stapling, enforced 
output of a paper after staple job is canceled by a user before finishing, switching to a cover-open status, switching to 
a paper jam status

FNDPMS

Manual bundle insert JAM

Sensor is detecting a paper but unable to staple.

FNMAR

Assist motor JAM

First detection of assist motor trouble after power-on
Detection of same trouble intermittently afterward.
*Assist motor trouble if detected in a raw.

FNMJF

Front alignment motor JAM

First detection of front alignment motor trouble after power-on
Detection of same trouble intermittently afterward.
*Front alignment motor trouble if detected in a raw.

FNMMSS

Staple shift motor JAM

First detection of staple shift motor trouble after power-on
Detection of same trouble intermittently afterward.
*Staple shift motor trouble if detected in a raw.

FNMS

Swing motor JAM

First detection of swing motor trouble after power-on
Detection of same trouble intermittently afterward.
*Swing motor trouble if detected in a raw.

FNMJR

Rear alignment motor JAM

First detection of rear alignment motor trouble after power-on
Detection of same trouble intermittently afterward.
*Rear alignment motor trouble if detected in a raw.

FNMGMT

Tray lift motor Jam

First detection of tray lift  motor trouble after power-on
Detection of same trouble intermittently afterward.
*Tray lift motor trouble if detected in a raw.

FNMFR

Paper end pushing guide 
motor Jam

First detection of paper end pushing guide after power-on
Detection of same trouble intermittently afterward.
*Paper end pushing guide motor trouble if detected in a raw.

FNMDT

Guide sub motor JAM

First detection of guide sub motor trouble after power-on
Detection of same trouble intermittently afterward.
*Guide sub motor trouble if detected in a raw.

FNMFECES

Escape/saddle transport 
switching flapper motor Jam

First detection of escape/saddle transport switching flapper motor trouble after power-on
Detection of same trouble intermittently afterward.
*Escape/saddle transport switching flapper motor trouble if detected in a raw.

FNCDP

Paddle Jam

First detection of paddle trouble after power-on
Detection of same trouble intermittently afterward.
*Paddle trouble if detected in a raw.

FNMSS

Staple JAM

Failure to detect “home position” at staple home position sensor within 400 msec of staple home position sensor 
moved out of home position while processing for staple.

FNMSLS

Staple-free staple bind motor 
JAM

First detection of staple-free staple bind motor trouble after power-on.
Intermittent detection of the same trouble afterward.
*Staple-free staple bind motor trouble if detected in a raw.

FSE_N

Saddle entrance paper 
sensor time-out JAM

Saddle entrance sensor is not turned on when the paper is transported by the “distance to turn on the saddle entrance 
sensor plus margin (100mm)” after the start of the switch back transportation.

FSE_S

Saddle entrance paper 
sensor remaining JAM

Saddle entrance sensor is not turned off when the paper is transported by the “paper length plus margin (50mm)” 
after the detection of the saddle entrance sensor ON.