DOWNLOAD Sharp MX-M850 (serv.man24) Service Manual ↓ Size: 2.01 MB | Pages: 7 in PDF or view online for FREE

Model
MX-M850 (serv.man24)
Pages
7
Size
2.01 MB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Details of Each Section - N Fusing Section
File
mx-m850-sm24.pdf
Date

Sharp MX-M850 (serv.man24) Service Manual ▷ View online

MX-M1100  FUSING SECTION  N – 3
D. Fusing operation
The upper and lower heat rollers apply heat and pressure to toner
on paper, fusing toner images on paper.
A heat roller of silicon rubber is used in this fuser. This is due to the
following:
1)
The upward separation is executed. (Since the hardness of the
upper heat roller is high, the lower heat roller is deformed to
face up paper). 
2)
The nip quantity is increased as it will increase the heating
capacity of the paper. (Nip quantity: 10 - 11mm)
3)
A flexible roller allows the toner to fuse without deforming the
toner shape.
E. Fusing temperature control
Thermistors are provided at the center and the edges of the upper
heat roller. 
The roller temperature is detected by the installed thermistor, and
the heater lamp is controlled to maintain the temperature at the
specified level.
The initial values of the specified temperature are as shown in the
table. (The fusing temperature can be set with Sim. 43-1.)
(*1) North America: 160 
°C
Europe: 175 
°C
F. Fusing temperature control when heavy paper 
is fed though the fuser
When heavy paper is fed, the heater lamp is controlled to maintain
the heat roller temperatures at the specified levels below. In addi-
tion, the SM (resist roller control motor) operation start temperature
is set to improve the job efficiency and the fusing performance. 
The default values of the specified levels are as shown in the table
below. (The fusing temperature can be set with Sim. 43-1.)
When paper is fed from the tray which is set as a heavy paper tray,
the fusing temperature is changed to that for feeding heavy paper
and CPM falls to about 75%. (The process speed is not changed.)
After completion of paper feed from the heavy paper tray (when the
tray is set to a normal paper tray, or the job is completed and the
machine enters the ready state, etc.), the fusing temperature is set
to the normal setting. 
Heavy paper: Heavy paper 1/2/3/4 and tab sheet.
G. Cleaning operation
The heat roller is cleaned by the web unit. 
The web diameter is 54mm, and the web sheet length is 50m.
After completion of a job, there is feed of 7mm (Max.) to 2mm. The
difference of 7mm to 2mm depends on the job quantity and the
pixel counter. 
Also after completion of warming up, it is fed by 7mm. This is
because the web sheet is pushed against the upper heat roller by
the backup roller and dirt on the web sheet must be removed. 
The feed quantity of the web sheet is 0.5mm / 7 copies (variable
with Sim. 43-32).
The web sheet remaining quantity is detected by two sensors
(WEBED, WEBSPD) attached to the web unit. 
In case of Web Near End, "Ready to scan for copy. (Maintenance
required.Code: FK3)" is displayed. 
In case of Web End, the code FK3 is displayed and the machine is
stopped. 
Replace the web unit, and clear the web feed counter with Sim. 24-
4. (The display of FK3 is also deleted.)
When the web unit is not installed, the FK3 code is displayed. In
this case, set the web unit and cancel it with Sim.14. (The FK3
code is deleted, but the web feed counter continues the operation.)
State
95/110-sheet 
machine
85-sheet 
machine
Upper heat roller
Ready standby
190 
°C
180 
°C
Preheat standby
(*1)
160 
°C
State
95/110-sheet 
machine
85-sheet 
machine
Upper heat roller
Fusing control 
temperature
205 
°C
195 
°C
PSM operation start 
temperature (RTH1, 
center section)
193 
°C
183 
°C
PSM operation start 
temperature (RTH2, 
edge section)
190 
°C
180 
°C
composed of the
web roller feed side
WEBED
WEBSPD
composed of the
web roller winding side
Upper heat roller
The remaining toner or paper dust etc.
on the upper heat roller.
Web backup roller
MX-M1100  FUSING SECTION  N – 4
H. Fusing separation pawl operation
The separation pawl of the upper heat roller is of the oscillation type
(oscillation width 3mm), and its operation is synchronized with the
web sheet feed. 
To clean the upper heat roller separation pawl, slow rising is per-
formed when rotating the heat roller, and dirt on the pawl is
attached to the upper heat roller and cleaned with the web sheet. 
The separation pawl of the lower heat roller is of the separation
type. 
The separation pawl of the lower heat roller separates and makes
contact when the heat roller is rotating and stopped, cleaning the
separation pawl. 
By the separation operation, dirt on the pawl is removed. The dirt of
the pawl attached to the roller is collected through the upper heat
roller and cleaned with the web sheet. 
This separation operation is controlled by the FRS (lower pawl sep-
aration solenoid). When starting rotation, separation is executed for
1sec. When stopping, separation is executed for 1.5 sec.
3. Disassembly and assembly
A. Fusing unit
(1) Fusing unit
1)
Open the front cover (a), and pull out the intermediate frame
(b).
2)
While pushing the lever (a), slide the ADU paper exit unit (b).
3)
Remove the screw (a), and remove the cover (b) and the knob
(c).
4)
Remove the screw (a), and remove the rail (b).
Unit
Parts
Page
Fusing unit
A
Fusing front lower PG home 
position detection
N - 5/a
B
Paper guide motor
C
WEB end detection
N - 5/b
D
WEB near end detection
E
Non-contact thermistor
N - 6/c
F
Thermostat
G
Thermostat
N- 6/d
H
Lower pawl separation solenoid
N - 7/e
G
E
F
D
A
B
C
H
a
b
a
b
a
a
b
c
a
b
MX-M1100  FUSING SECTION  N – 5
5)
Remove the screw (a), and remove the fusing unit (b).
* Note that the fusing unit is heated to a high temperature,
When removing it, be sure to hold the resin section as indi-
cated below.
a. Fusing front lower PG home position detection/
Paper guide motor
1)
Remove the fusing unit.
2)
Disconnect the connector (a), and remove the fusing front
lower PG home position detection (b).
3)
Disconnect the connector (a), and remove the screw (b).
Remove the paper guide motor (c).
b. WEB end detection / WEB near end detection
1)
Remove the fusing unit.
2)
Remove the screw (a) on the side of "W" mark, and remove
the web unit (b).
3)
Remove the screw (a), and remove the cover (b).
4)
Remove the WEB end detection (a) and WEB near end detec-
tion (b). Disconnect the connector (c).
a
a
b
a
b
a
b
b
c
a
a
b
W
W
a
a
b
a
b
c
MX-M1100  FUSING SECTION  N – 6
c. Non-contact thermistor / Thermostat
1)
Remove the fusing unit.
2)
Insert a screwdriver into the pressure release shaft (a) to
release the pressure.
* When the pressure is released, the arrow mark on the pres-
sure release shaft faces obliquely (b). When the pressure is
applied, it faces upward (c).
3)
Remove the screw (a), and separate the fusing upper unit (b)
and the fusing lower unit (c).
* Do not perform pressing operation with the fusing upper unit
and the fusing lower unit separated from each other. 
4)
Remove the screw (a), and remove the cover (b). Disconnect
the connector (c), and remove the screw (d). Remove the Non-
contact thermistor (e).
5)
Remove the screw (a), and remove the terminal (b). Remove
the screw (c) and the washer (d). Remove the thermostat (e).
* When tightening the screw (a), use a great care to tighten it
securely.  
* When the screw becomes loose, replace the screw (a) and
the thermostat (e). 
d. Thermostat
1)
Remove the fusing unit.
2)
Insert a screwdriver into the pressure release shaft (a) to
release the pressure.
* When the pressure is released, the arrow mark on the pres-
sure release shaft faces obliquely (b). When the pressure is
applied, it faces upward (c).
3)
Remove the screw (a), and separate the fusing upper unit (b)
and the fusing lower unit (c).
* Do not perform pressing operation with the fusing upper unit
and the fusing lower unit separated from each other. 
a
c
b
a
a
b
c
a
b
c
e
d
b
b
a
a
c
d
e
a
c
b
a
a
b
c
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  • DOWNLOAD Sharp MX-M850 (serv.man24) Service Manual ↓ Size: 2.01 MB | Pages: 7 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp MX-M850 (serv.man24) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp MX-M850 (serv.man24) Copying Equipment. Information contained in Sharp MX-M850 (serv.man24) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.