Outline Of Operations - Sharp MX-2314N Service Manual

Signal name Name
FUFM Fusing cooling fan
FUM Fusing motor
HL_LM Heater lamp (HL_LM)
HL_UM/US Heater lamp (HL_UM/US)
HLPCD Fusing pressure detector
PRM Fusing pressure control motor
TH_LM_IN Fusing temperature sensor
TH_UM_IN Fusing temperature sensor (Main)
TH_US_IN Fusing temperature sensor (Sub)
TS LM Thermostat LM
TS UM Thermostat UM
TS US Thermostat US
WEBEND Web end detector
No. Name
1 Fusing roller (F1)
2 Fusing roller (F2)
3 Fusing roller (B)
4 Fusing web roller
5 HL control PWB
6 Discharge brush
7 Separation plate
8 Separation pawl
9 Fusing belt
B. Outline of operations
This machine employs the fusing system by the belt.
The features of the belt-type fusing system are as follows:
1) Short warm-up time
2) Low power consumption
3) Wide nip providing high fusing capability
C. Heater lamp driving
The surface temperature of the heat roller and the fusing belt
detected by the fusing temperature sensor is sent to the PCU. If the
temperature is lower than the specified temperature, the heater
lamp lighting signal is sent from the PCU to the heater lamp drive
circuit in the HL PWB.
When the power triac in the heater lamp drive circuit is turned ON,
the AC power is supplied to the heater lamp to light the lamp and
heat the fusing belt.
A thermostat is provided as a safety device against an abnormally
high temperature in the heat roller and the fusing belt.
When the thermostat is opened, the AC power supply to the heater
lamp is cut off.
The heater lamp is arranged to fusing roller (F1) and fusing roller
(B).
In heater lamp (HL_UM/US), two lamps are integrated into one.
Heater lamp operations
Heater lamp
Heater lamp Heats fusing roller (F1) and the fusing belt.
(HL_UM)
Heater lamp Heats fusing roller (F1) and the fusing belt.
(HL_US) Turns ON continuously when in warming up.
Heater lamp Heats fusing roller (B). Does not turn ON while heater
(HL_LM) lamp (HL_UM) and heater lamp (HL_US) light up.
Cools the fusing section and the paper exit section.
Drives the fusing section.
Heats the fusing roller (B).
Heats the fusing roller (F1), and fusing belt.
Detects the fusing pressure state.
Controls ON/OFF of the fusing roller pressure.
Detects the surface temperature of the fusing roller (B).
Detects the surface temperature at the center of the fusing belt.
Detects the suffered temperature at the edge section of the fusing belt.
Shuts down the heater lamp (HL_LM) circuit when the fusing section is overheated.
Shuts down the heater lamp (HL_UM) circuit when the fusing section is overheated. (Center section)
Shuts down the heater lamp (HL_US) circuit when the fusing section is overheated. (Edge section)
Detects web end of the fusing unit.
Heats the fusing belt.
The cushion layer of the roller forms a wide nip between the fusing belt and fusing roller (B).
Heats the back surface of paper to fuse toner on the paper.
Cleans the fusing roller (B) and the fusing belt.
Drives the heater lamp.
Discharges static electricity generated in the fusing section to the ground.
Separates the whole surface of paper. (non-contact)
Separates fusing roller (B) when it is attached.
Heats the front surface of paper to fuse toner on the paper.
Operation
MX-3114N OPERATIONAL DESCRIPTIONS 13 – 49
Function/Operation
Function/Operation
D. Fusing operation
Color toner (Y, M, C, and K) on paper is heated and pressed by the
fusing belt, fusing roller (F2), and fusing roller (B) to be fused on
paper.
Toner in the four layers on the paper is fused by heating from up
and down and both sides.
The fusing belt, fusing roller (F2) which is provided with the cushion
layer, and fusing roller (B) realize the following operations.
1) The nip amount is increased and the heat capacity to paper is
increased.
2) By pressing with the flexible roller, toner of many layers can be
fused without being deformed.
3) An even pressure is applied to rough surface of toner (due to
the multi-layer composition).
Fusing roller (F2)
Fusing belt
Fusing roller
(F2)
Fusing belt
Fusing roller (B)
Fusing roller
(B)