MX-M850 (serv.man24). Details of Each Section - N Fusing Section — Sharp Copying Equipment Service Manual (repair manual)

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MX-M850 (serv.man24)
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Device
Copying Equipment / Details of Each Section - N Fusing Section
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mx-m850-sm24.pdf
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View Sharp MX-M850 (serv.man24) Service Manual online

MX-M1100  FUSING SECTION  N – 1
MX-M1100
Service Manual
 
[N] FUSING SECTION
1. Electrical and mechanism relation diagram
Code
Name
Type
Function / Operation
FPGHP
Fusing paper guide home position sensor
Transmission
Detects the home position of the fusing paper guide. 
FPGM
Fusing paper guide motor
Controls the fusing paper guide motor. 
FRS
Lower pawl separation solenoid
Controls the lower pawl separation solenoid. 
FUM
Fusing roller drive motor
Drives the fusing roller. 
HL1
Upper heat roller heater lamp 1
Controls heating the center section of the upper heat roller. 
HL2
Upper heat roller heater lamp 2
Controls heating the both edges of the upper heat roller. 
HL4
Upper heat roller heater lamp 4
Upper heat roller heater lamp control. (Europe 95/110-sheet model only)
FUM
FUM
WEBM
WEBM
WEBED
WEBED
WEBSPD
WEBSPD
HL1, HL2, HL4
HL1, HL2, HL4
HLTS2
HLTS2
HLTS1
HLTS1
RTH1_com
RTH1_com
RTH2
RTH2
5
5
6
6
XFRS
XFRS
FPGM
FPGM
FPGHP
FPGHP
1
1
3
3
7
7
4
4
4
4
2
2
2
2
2
2
2
2
2
2
CN-21
23 GND2
25 +5V_C
27 XFUM
29 FUMCLK
31 FUM-T
38V0
1
GND1
2
GND2
1
+5V_C
2
XFUM
3
FUMCLK 4
FUN-T
5
CN-16
CN5
HLCNT1
3
1
HL_CNT1
2
GND2
GND2
5
3
HL_CNT2
4
GND2
HLCNT2
7
5
HL_CNT4
6
GND2
GND2
9
7
HL_CNT3
8
GND2
HLCNT4
11
10
HLPR
GND2
13
11
GND2
HLCNT3
15
GND2
16
HLPRout
21
GND2
23
CN7
5 GND1
9
GND1
9
10
+38V0
10
10 +38V0
CN1
1
N-HL
2
(NC)
3
L-HL
CN4
4 L-HL
4
1
L-HL
3 N-HL
3
2
(NC)
3
N-HL
AC PWB
CN-4
7
RTH2
9
GND2
13
GND2
15
RTH1_d
17
RTH1_com
19
GND2
N-HL4
1
2
21
WEBSPD
N-HL2
3
4
23
GND2
L-HLCOM
5
25
+5V_WEBSPD
N-HL1
1
27
WEBED
2
(Power source)
L-HLCOM
3
1
HL1-N
1
1
HL1-N
1
29
GND2
2
HL2-N
2
3
HL2-N
3
3
HL4-N
3
2
HL4-N
2
31
+5V_WEBED
N-HL2
1
4
(NC)
4
3 HL2-L
3
2
5
L-HLCOM
5
2 HL4-L
2
33
WEBMA
L-HLCOM
3
6
L-HLCOM
6
1 HL1-L/HL4-L 1
1 HL1-L
1
35
WEBMB
37
A1
RTH2
A10
4 RTH2
4
A2
GND2
A9
3 GND2
3
A4
GND2
A7
A5
RTH1_d
A6
A6
RTH1_com
A5
A7
GND2
A4
A8
(NC)
A3
1 RTH1_d
1
A9
(NC)
A2
2 RTH1_com 2
A10
(NC)
A1
3 GND2
3
B1
(NC)
B9
B2
WEBSPD
B8
1
WEBSPD
B3
GND2
B7
2
GND2
B4
+5V_WEBSPD
B6
3
+5V_WEBSPD
B5
WEBED
B5
1
WEBED
B6
GND2
B4
2
GND2
B7
+5V_WEBED
B3
3
+5V_WEBED
B8
WEBMA
B2
B9
WEBMB
B1
1
WEBMA
1
2
WEBMB
2
(Fusing drawer upper)
(Connector A)
(Connector B)
PCU
PWB
CN2
CN3
CN-1
CN-9
CN_LEDout1
1
CN_LEDin1
18
FUPOD
2
XFPGMXB
3
GND2
4
XFPGMXA
5
+5V_FUPOD
6
XFPGMB
7
FPGHP
8
(Power source)
XFPGMA
9
N-HL3
1
1
1
GND2
10
(N.C)
2
2
(NC)
(NC)
2
+24V_A
11
L-HLCOM
3
3
(NC)
3
+5V_FPGHP
12
4
FG
4
5
(NC)
(NC)
5
PRTH
14
6
6
GND2
16
A1
(NC)
A10
A2
(NC)
A9
1
+24V_A
1
1
+24V_A
A3
(NC)
A8
2
XFRS
2
2
XFRS
A4
+24V_A
A7
A5
XFRS
A6
6
(NC)
6
A6
+24V_A
A5
5
+24V_A
5
A7
XFPGMA
A4
4
XFPGMA
4
A8
XFPGMB
A3
3
XFPGMB
3
A9
XFPGMXA
A2
2
XFPGMXA
2
A10
XFPGMXB
A1
1
XFPGMXB
1
B1
FUPOD
B9
B2
GND2
B8
B3
+5V_FUPOD
B7
B4
FPGHP
B6
B5
GND2
B5
B6
+5V_FPGHP
B4
1
FPGHP
B7
(NC)
B3
2
GND2
B8
PRTH
B2
3
+5V_FPGHP
B9
GND2
B1
(Connector B)
(Fusing drawer lower)
(Connector A)
+24VA
9
XFRS
10
+24VA
1
XFRS
2
1
2
1 PRTH
1
2 GND2
2
CN4
HL
PWB
H
L
P
WB
CN_LEDin4
MX-M1100  FUSING SECTION  N – 2
2. Operational descriptions
A. Outline
This section performs the following functions and operations. 
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: 
Upper heat roller 70 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.
3)
The thermistor is provided to detect the temperature in the fus-
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.)
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.
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. 
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.
HLTS1
Thermostat (1)
Cuts conduction to the heater lamp when the temperature rises abnormally. 
(HL1, HL4)
HLTS2
Thermostat (2)
Cuts conduction to the heater lamp when the temperature rises abnormally. 
(HL2)
RTH1_com
Upper heat roller thermistor
Thermistor
Detects the temperature of the upper heat roller [Center section] 
(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)
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.)
Code
Name
Type
Function / Operation
Upper heat roller
Upper heater lamp
Fusing paper guide
composed of the
web roller feed side
composed of the
web roller winding side
Upper heat roller
separation pawl
Lower heat roller
separation pawl
Web backup roller
Lower heat roller
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
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