MX-4100N, MX-4101N, MX-5000N, MX-5001N (serv.man32). Service Manual-Details Of Each Section-(M)Fuser Section - Sharp Copying Equipment Service Manual (repair manual)

MX-4101N  FUSER SECTION  M – 1

MX-4101N

Service Manual

 

P

ᴜᴶᴳᴉų

RWZ

R

CN2

B03P-VL-K

CN4

HL

PWB

PCU

P

WB

B03P-VL-RD

CN3

B08B-PASK

B2P3-VH

CN14

R

S

M-3pin(BK)

P

BK

WH

BL

P

D

F1B-20DE

E

CN13

R

S

M-2pin

P

B32B-PHDSS

R

S

M-2pin

P

R

S

M-4pin

P

P

S

M-2pin

R

B34B-PHDSS

RCZR

10PIN

TH_LM_IN

TH_EX2_IN

16

D-GND

/HL_PR

D-GND

D-GND

D-GND

2

HL_OUT_EX

INT24V1

N,C

N,C

N,C

1

N-HL(US)

1

HL_OUT_UM

8

12

INT24V1

D-GND

HL_OUT_US

4

6

N-HL(UM)

1

L-HL

U

3

3

N

-HL(EX)

2

N,C

TH_UMCS_IN
2

B-9

22

6

3

2

1

5

1

6

16

16

D-GND

18

D-GND

14

TH_UM_IN

18

HL_OUT_EX

HL_OUT_LM

6

N-HL(EX)

3

L-HL(LM)

2

N-HL(LM)

1

N-HL(US)

5

N-HL(UM)

L-HL

U

4

5

15

D-GND

2

19

19

15

11

14

13

13

D-GND

WEBD

11

D-GND

1

TH_UMCS_IN

10

WEBD

12

TH_EX1_IN

17

D-GND

TH_LM_IN

9

TH_EX2_IN

7

5

10

88

66

44

D-GND

A-9

A-1

A-10

5VN

A-1

A-2

11

13

17

D-GND

A-8

D-GND

4

1

D-GND

2

TH_EX1_IN

3

TH_EX2_IN

B-3

D-GND

1

TH_LM_IN

1

2

B-4

B-7

B-6

TH_UM_IN
1

3

2

1

2

TH_UMCS_IN

D-GND

7

5

6

3

1

L-HL(LM)

2

B-2

B-1

TH_UM_IN

TH_UM_IN

HL_OUT_UM

8

D-GND

B-8

B-7

12

14

14

TH_US_IN

D-GND

TH_EX1_IN

1

RCZR

9PIN

B-9

TH_LM_IN

A-7

D-GND

A-8

A-10

WEBD

A-9

3

77

9

9

A-5

A-4

A-6

A-3

5

1

1

2

5VN

D-GND

A-7

A-6

A-5

A-2

A-3

A-4

3

B-5

B-8

B-6

B-4

B-3

B-2

B-5

TH_EX2_IN

D-GND

D-GND

B-1

TH_UMCS_IN

4

3

N-HL(LM)

10

8

D-GND

HL_OUT_US

2

1

5VN

10

TH_EX1_IN

3

2

/HL_PR

HL_OUT_LM

12

TH_US_IN

4

TH_US_IN

3

2

4

2

D-GND

TH_US_IN

4

1

W

EBD

2D

-G

N

D

3

1

CN14 INT24V1 P-GND /FUM_CK

2

5

/FUM_D

29

FUM_LD

31

27

CN13

DF1B-26Pin

INT24V1

D-GND

32

31

19

19

WEB_M2out

18

WEB_M1out

18

P

SL-2Pin

R

2

WEB_M2out

2

1

WEB_M1out

1

R

SM-12Pin

P

/FUM_D

1

INT24V1

4

1

6

6

NC

4
5

FUM_LD

5

2

2

P-GND

3

3

/FUM_CK

WEBM

WEB-END

FUM

TH_UM

TH_LM

TH_US

TS SUB

TS MAIN

TS EX1

TH_EX1

TH_EX2

TS EX2

HL_EX2

HL_EX1

HL_UM

HL_LM

1

5

2

2

3

4

6

6

2

MX-4101N  FUSER SECTION  M – 2

For driving the fusing unit, the drive power is transmitted from the
drive motor (FUM) through the connection gear to the upper heat
roller gear.
Driving by the drive motor (stepping motor) is performed according
to the control signal sent from the PCU.

The surface temperature of the heat roller detected by the ther-
mistor is sent to the PCU. When the temperature is lower than the
specified level, the heater lamp ON signal is sent from the PCU to
the heater lamp drive circuit on the HL PWB.
The power triac in the heater lamp drive circuit is turned on, and the
AC power is supplied to the heater lamp, lighting the lamp and
heating the heat roller.
To prepare for an abnormally high temperature of the heat roller,
the thermostat is provided for safety.
When the thermostat is opened, the power supply (AC line) to the
heater lamp is cut off.

Color toner (Y,M,C,K) on paper is subject to heat and pressure to
be fused on paper.
At that time, color toner of Y, M, C, and K are mixed to reproduce
colors approximate to the document image colors.
The heater lamps are provided in the lower and the upper heat
roller to heat paper from the upper and the lower sides.
This is because paper must be heated both from the upper side
and from the lower side together in order to melt and fuse toner in
the four layers on the paper.
The upper and the lower heat rollers of silicon rubber are
employed.
This is because of the following reasons.

1)

To increase the nip quantity. To increase the heating capacity
for paper.

2)

By pressing the flexible roller, multi-layer toner can be fused
without deformation.

3)

An even pressure can be applied to rough surface of toner lay-
ers (multi-layer structure).

FUM

Fusing motor

Drives the fusing unit.

HL_LM

Heater lamp lower main

Heats the fusing roller (pressing).

HL_UM

Heater lamp upper main

Heats the fusing roller (heating).

HL_EX1

Heater lamp external 1

Heats the fusing roller (heating). (External)

HL_EX2

Heater lamp external 2

Heats the fusing roller (heating). (External)

HLPCD

Fusing pressure release sensor  Detects  pressure release of the fusing roller.

TS MAIN

Thermostat (1)

Shuts conduction to the heater lamp when the temperature rises abnormally. [For the fusing roller (heating)]

TS EX1

Thermostat (2)

Shuts conduction to the heater lamp when the temperature rises abnormally. [For the fusing roller (heating)] 
(External)

TS EX2

Thermostat (3)

When the temperature rises abnormally, conduction to the heater lamp is cut off. 
[For the fusing roller (heating)] (External)

TS SUB

Thermostat (4)

When the temperature rises abnormally, conduction to the heater lamp is cut off. 
[For the fusing roller (pressing)] (External)

PRM

Fusing pressure release motor 

Adjusts the fusing roller pressure. 

TH_UM

Fusing temperature sensor (1)

Detects the surface temperature of the fusing roller (heating). (Center section)

TH_US

Fusing temperature sensor (2)

Detects the surface temperature of the fusing roller (heating). (Edge section)

TH_LM

Fusing temperature sensor (3)

Detects the surface temperature of the fusing roller (pressing).

TH_EX1

Fusing temperature sensor (4)

Detects the surface temperature of the heat roller (external).

TH_EX2

Fusing temperature sensor (5)

Detects the surface temperature of the heat roller (external).

1

Fusing roller (Heating)

Applies heat and pressure to toner on paper to fuse it on paper.

2

Upper separation pawl

Mechanically separates paper which was not naturally separated from the fusing roller (heating).

3

Fusing roller (Pressing)

Applies heat and pressure to toner on paper to fuse it on paper.

4

Transport roller 9 (Drive)

Transports paper from the fusing roller to the paper exit roller 1.

5

Web roller

Cleans the upper heat roller.

6

Lower separation pawl

Mechanically separates paper which was not naturally separated from the fusing roller (pressing).

FUM

PCU

MX-4101N  FUSER SECTION  M – 3

The upper and the lower heat rollers are normally pressed. When,
however, one of the following conditions is satisfied, they are
released from the pressure.
• When the machine shifts to the pre-heating mode.
• When the machine shifts to the auto power shut off mode.
• When the power switch of the operation panel is turned OFF.
• When the machine has been left in the ready state for 20 min-

utes.

• When the envelope mode is used.

The pressure release motor (PRM) rotates to drive the pressure
release lever of the fusing unit to the pressure release state via the
reduction gears (6 pcs.).
When 1710ms passes from operating the pressure release detec-
tion level and driving  the pressure release sensor (HLPCD) to the
transmission state (L level), the pressure release motor stops to
complete the pressure release operation. 

When an end use performs any operation or when the machine
receives a job signal, the pressure release motor rotates reversely
to dive the pressure release lever to the pressing state. 
When 430ms passes from when the pressure release sensor
(HLPCD) is in the interruption state (H level), the pressure motor
stops to complete the pressing operation.

NOTE: When turning OFF the main power switch of the machine,

be sure to turn OFF the power switch of the operation
panel and check to confirm that the LCD is turned OFF. 
If the main power switch is turned OFF with the LCD dis-
played, the power is tu5ned off without completion of the
pressure release operation. This will deform the upper and
the lower heat rollers. 
When, in addition, the fusing roller is installed again after
removing it, be sure to install it under the pressure release
state.

The temperature sensor is provided at the center and the edge sec-
tion of the upper heat roller and at the edge section of the lower
heat roller.
The heat roller temperature is detected by each temperature sen-
sor to control the heater lamp to maintain the temperature at the
specified level.
In addition, the fusing temperature is switched according to the kind
of paper.

1)

Open the right door.

Pressure release lever

Pressure release
motor (PRM)

Pressing condition

Pressure release
state

Ready 
condition
Print mode

Black/White 
plain paper

170

220

125

Color plain 
paper

170

220

130

Thick paper

185

220

140

OHP

180

220

140

Envelope

200

220

140

Glossy paper

185

220

140

a

Upper thermostat

b

Lower thermostat

c

External thermostat

d

Upper heater lamp

e

Lower heater lamp

f

External heater lamp

g

Fusing cleaning roller / Fusing cleaning roller bearing

a

b

d

e

g

c

c

f

f

MX-4101N  FUSER SECTION  M – 4

2)

Remove the blue screw and the step screw. Release the lock
lever and remove the fusing unit.

1)

Remove the fusing unit.

2)

Remove the screw. Pull out the interface harness and remove
the fusing upper cover.

3)

Remove the screw, and remove the terminal. Remove the
upper thermostat.
* Install so that the caulked section of the terminal faces up.

1)

Remove the fusing unit.

2)

Remove the screw, and remove the fusing lower cover.

3)

Remove the screw, and remove the terminal. Remove the
lower thermostat.
* Install so that the caulked section of the terminal faces

down.

1)

Remove the fusing unit.

2)

Remove the fusing upper cover.

3)

Remove the screw, and remove the terminal. Remove the
external thermostat.
* Install so that the caulked section of the terminal faces up.