MX-5500N, MX-6200N, MX-7000N (serv.man17). MX-FNX3 4 MX-RBX2 MXPNX2A-D SERVICE MANUAL-Operational Description - Sharp Copying Equipment Peripheral (repair manual). Page 12

MX-FNX4  OPERATIONAL DESCRIPTION  5 – 12

If alignment was executed with the crescent roller in contact with
the stack of sheets, the resulting friction against the roller causes
the stack to move inappropriately. To prevent this problem, the
phase of the roller is identified and used to determine the timing of
alignment.
The phase of the crescent roller is identified by the crescent roller
phase sensor (FSCRPD). The flag for the crescent roller phase
sensor is mounted to the crescent roller shaft. The flag will leave
the sensor while the roller shaft rotates, turning the sensor ON or
OFF, enabling the assumption that the crescent roller is positioned
at the opposite side of the stack. The alignment plates are operated
to correspond with this change in the state of the sensor.

The paper folding mechanism consists of a guide plate, paper fold-
ing rollers, paper pushing plate, and paper positioning plate.
The guide plate is used to cover the folding rollers while sheets are
output so as to prevent sheets from coming into contact with the
folding rollers during output. Before the stack is folded, the guide
plate moves down to enable the folding rollers to operate.
Designations and functions of the motors and sensors to be used in
the folding mechanism are shown below.

Crescent roller

phase sensor (FSCRPD)

Flag

Feed motor

Alignment plate

Crescent roller

Stack

FSFM

Alignment plate

Sensor

flag

Crescent

roller

Crescent roller

phase sensor

(FSCRPD)

If the crescent roller

was in contact with the

stack, alignment operation

could be obstructed.

Motor

Function

Folding motor (FSFOM)

Drives paper folding roller

Paper pushing plate motor 
(FSLGM)

Drives paper pushing plate

Sensor

Function

Paper pushing plate motor clock 
sensor (FSLGE)

Detects clock pulses from the paper 
pushing plate motor

Paper folding motor clock sensor 
(FSFOE)

Detects clock pulses from the paper 
folding motor

Tray paper sensor (FSTPD)

Detects presence/absence of paper 
on delivery tray of saddle stitch unit 

Delivery sensor (FSPDD)

Detects delivery of paper

Paper pushing plate home 
position sensor (FSLGHPD)

Detects home position of paper 
pushing plate

Paper pushing plate top position 
sensor (FSLGTD)

Detects top position of paper pushing 
plate

Vertical path paper sensor 
(FSVPPD)

Detects remaining paper after 
correction of jam 

Paper folding home position 
sensor (FSFOHPD)

Detects home position of paper 
folding roller

Alignment operation is

started when the flag has

covered the sensor and the

crescent roller is away from

the stack.

Crescent roller phase

sensor (FSCRPD)

Alignment operation

Feed motor (FSFM)

First sheet

Second sheet

Feed motor

stop