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). Page 3

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MX-4101N  FUSER SECTION  M – 3
D. Automatic pressure release system
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.
(1) Pressure release operation
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. 
(2) Pressing 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.
E. Fusing temperature control
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.
In the case of SW-A
3. Disassembly and assembly
A. Fusing unit
1)
Open the right door.
Pressure release lever
Pressure release
motor (PRM)
Pressing condition
Pressure release
state
Mode
Paper
Upper 
heater 
lamp main
Upper 
heater 
external
Lower 
heater 
lamp main
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
Parts
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
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