Read Sharp MX-M850 (serv.man24) Service Manual online
MX-M1100 FUSING SECTION N – 2
2. Operational descriptions
A. Outline
This section performs the following functions and operations.
1)
1)
The fusing roller applies heat and pressure to toner attached to
paper in the transfer section and fuses toner images onto
paper.
• Heat roller diameter:
paper in the transfer section and fuses toner images onto
paper.
• Heat roller diameter:
Upper heat roller 70 mm
Lower heat roller 60 mm
Lower heat roller 60 mm
• Heater lamp:
HL1, HL2, HL4 (Europe 95/110-sheet model only)
2)
To clean the upper heat roller, the web unit is provided in the
upper section of the upper heat roller.
It is composed of the web sheet feed side, the winding side,
and the back-up roller which is used to press the web sheet
onto the upper heat roller.
In addition, the sensor is provided to detect the remaining
quantity of the web sheet and the end of the websheet.
upper section of the upper heat roller.
It is composed of the web sheet feed side, the winding side,
and the back-up roller which is used to press the web sheet
onto the upper heat roller.
In addition, the sensor is provided to detect the remaining
quantity of the web sheet and the end of the websheet.
3)
The thermistor is provided to detect the temperature in the fus-
ing section.
• Upper heat roller center:
ing section.
• Upper heat roller center:
Non-contact type thermistor (Main thermistor)
• Upper heat roller edges:
Contact type thermistor (Sub thermistor)
• Lower heat roller edges:
Contact type thermistor (The thermistor (PRTH) is used only
in the 85-sheet machine for Japan.)
(Though the other fusing units do not employ PRTH, only the
PRTH connector section of the fusing unit of the 85-sheet
machine for Europe is processed with short pins for identifi-
cation of the unit model.)
(In the other fusing units, the PRTH connector section is
open.)
in the 85-sheet machine for Japan.)
(Though the other fusing units do not employ PRTH, only the
PRTH connector section of the fusing unit of the 85-sheet
machine for Europe is processed with short pins for identifi-
cation of the unit model.)
(In the other fusing units, the PRTH connector section is
open.)
4)
The thermostats are provided for safety of the fusing section.
• HLTS1: Thermostat (1) Cuts conduction to HL1 and HL4.
• HLTS2: Thermostat (2) Cuts conduction to HL2.
• HLTS1: Thermostat (1) Cuts conduction to HL1 and HL4.
• HLTS2: Thermostat (2) Cuts conduction to HL2.
B. Fusing roller drive
To drive the fusing roller, the drive power is transmitted from the
drive motor (FUM) through the connection gear to the upper heat
roller gear.
The drive motor (stepping motor) is driven according to the control
signal sent from the PCU.
drive motor (FUM) through the connection gear to the upper heat
roller gear.
The drive motor (stepping motor) is driven according to the control
signal sent from the PCU.
C. Heater lamp drive
The surface temperature of the heat roller detected by the ther-
mistor is sent to the PCU. When it is lower than the specified level,
the PCU sends the heater lamp lighting signal to the heater lamp
drive circuit in the HL PWB.
When the power triac is turned ON through the photo triac coupler
in the heater lamp drive circuit, the AC power is supplied to the
heater lamp to turn it on and heat the heat roller.
mistor is sent to the PCU. When it is lower than the specified level,
the PCU sends the heater lamp lighting signal to the heater lamp
drive circuit in the HL PWB.
When the power triac is turned ON through the photo triac coupler
in the heater lamp drive circuit, the AC power is supplied to the
heater lamp to turn it on and heat the heat roller.
HLTS1
Thermostat (1)
Cuts conduction to the heater lamp when the temperature rises abnormally.
(HL1, HL4)
(HL1, HL4)
HLTS2
Thermostat (2)
Cuts conduction to the heater lamp when the temperature rises abnormally.
(HL2)
(HL2)
RTH1_com
Upper heat roller thermistor
Thermistor
Detects the temperature of the upper heat roller [Center section]
(Non-contact, detection side)
(Non-contact, detection side)
RTH1_d
Upper heat roller thermistor
Thermistor
Detects the temperature of the upper heat roller [Center section]
(Non-contact, detection side)
(Non-contact, detection side)
RTH2
Upper heat roller thermistor 2
Thermistor
Detects the temperature of the upper heat roller (Both edges)
WEBED
Web end sensor
Thermistor
Detects Web End.
WEBM
Web roller drive motor
Controls the web motor.
WEBSPD
Web remaining quantity sensor
Transmission
Detects the web remaining quantity.
No.
Name
Function /Operation
1
Upper heat roller
Applies heat and pressure to toner on paper to fuse.
2
Upper heat roller separation pawl
Mechanically separates paper which is not separated naturally from the upper heat roller.
3
Lower heat roller
Applies heat and pressure to toner on paper to fuse.
4
Lower heat roller separation pawl
Mechanically separates paper which is not separated naturally from the lower heat roller.
5
Web roller
Cleans the upper heat roller.
6
Web backup roller
Applies a pressure to web paper to bring it into contact with the upper heat roller.
7
Fusing paper guide
Determines the height of paper stack in the fusing section.
(The height can be adjusted with SIM 43-33. Normally it is set to the default value.)
(The height can be adjusted with SIM 43-33. Normally it is set to the default value.)
Code
Name
Type
Function / Operation
Upper heat roller
Upper heater lamp
Fusing paper guide
composed of the
web roller feed side
web roller feed side
composed of the
web roller winding side
web roller winding side
Upper heat roller
separation pawl
separation pawl
Lower heat roller
separation pawl
separation pawl
Web backup roller
Lower heat roller
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