Read Sharp AR-M351U / AR-M451U (serv.man12) Service Manual online
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 23
The fusing heat roller (heating) is provided with two heater lamps,
which heat the fusing roller to fuse toner onto paper.
which heat the fusing roller to fuse toner onto paper.
The fusing rollers (pressing) are of silicon rubber because of the
following reasons and purpose.
following reasons and purpose.
1) Paper is separated upward. (Since the fusing roller (heating) is
of higher hardness, the fusing roller (pressing) is deformed to
separate paper upward.)
separate paper upward.)
2) The nip quantity is increased to increase heat capacity for
paper.
3) By pressing paper with the flexible roller, toner is fused without
deformation.
(4) Fusing temperature control
The temperature sensor is provided at the center of the fusing
roller (heating).
roller (heating).
The roller temperature is detected by the installed temperature
sensor, and the heater lamp is controlled so that the temperature
is maintained at the specified level.
sensor, and the heater lamp is controlled so that the temperature
is maintained at the specified level.
In addition, the fusing temperature is switched according to the
kind of paper.
kind of paper.
(5) Cleaning roller
The fusing section cleaning roller of this machine is made of the
blast process.
1) Remaining toner attaches to the upper heat roller.
1) Remaining toner attaches to the upper heat roller.
2) Due to coating and the temperature characteristics of the
upper heat roller, toner is not attached to the upper heat roller
but to the lower heat roller.
but to the lower heat roller.
3) Remaining toner on the lower heat roller is further attached to
the cleaning roller due to the temperature characteristics and
the difference in roughness of surfaces of the rollers.
the difference in roughness of surfaces of the rollers.
4) Remaining toner attached to the cleaning roller is accumulated
until the roller is replaced.
D. Maintenance and parts replacement
(1) Maintenance list
Mode
Fusing roller
AR-M351U/
M355U
AR-M451U/
M455U
Ready condition
print mode
print mode
Plain paper
190°C
190°C
Heavy Paper
190°C
190°C
Postcard
190°C
190°C
Envelope
190°C
190°C
Pre-heat
150°C
150°C
Unit name
No.
Part name
When
calling
100K
200K
300K
400K
500K
600K
700K
800K
Remark
Fusing
section
1
Upper heat roller
✕
✕
▲
✕
▲
✕
▲
✕
▲
2
Lower heat roller
✕
✕
▲
✕
▲
✕
▲
✕
▲
3
Upper separation pawl
❍
❍
▲
❍
▲
❍
▲
❍
▲
4
Lower separation pawl
❍
❍
▲
❍
▲
❍
▲
❍
▲
5
Thermistor
✕
✕
✕
✕
✕
✕
✕
✕
✕
Clean and remove
paper dust.
paper dust.
6
Upper heat roller gear
✕
▲
✕
▲
✕
▲
✕
▲
7
CL roller
✕
✕
▲
✕
▲
✕
▲
✕
▲
8
CL roller bearing
✕
✕
▲
✕
▲
✕
▲
✕
▲
9
Paper guides
❍
❍
❍
❍
❍
❍
❍
❍
❍
10
Gears
✩
✩
✩
✩
✩
✩
✩
✩
5
3
4
1
6
5
8
2
7
8
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