AR-6020V OPERATIONAL DESCRIPTIONS 11 – 21
13. Fusing section
A. 20/23 cpm
(1) Mechanism relation diagram
(2) Fusing unit drive
The driving of fuser unit is; the driving force is transported to fuser
roller, thru the Main motor (MM) and connection gears, based on
the controlling signal from MCU.
(3) Heater lamp drive
The surface temperature of the heat roller detected by the thermis-
tor is sent to the MCU.
When the temperature is lower than the specified level, the heater
lamp ON signal is sent from the MCU to the heater lamp drive cir-
cuit on the HL PWB.
The power triac in the heater lamp drive circuit is turned on, and the
AC power is supplied to the heater lamp, lighting the lamp and
heating the heat roller.
To prepare for an abnormally high temperature of the heat roller,
the thermostat is provided for safety.
When the thermostat is opened, the power supply (AC line) to the
heater lamp is cut off.
MM
2
1
TS_UM
TH_US
TH_MY
3
HL_PR
HLout
2
2
4
2
Signal name
Name
Function and operation
MM
Main motor
Drives the most of the driving parts except the duplex section, the toner section and the scanner sections.
HL_PR
Heater lamp control relay
Turns ON/OFF the control of the heater relay.
HLout
Heater lamp
Turns ON/OFF the heater lump.
TH_MY
Thermistor UM
Regulates Heat Roller Temperature at the end of the Heat Roller.
TH_US
Thermistor US
Regulates Heat Roller Temperature at center of the Heat Roller.
TS_UM
Thermostat UM
Fusing roller overheat protection. Cuts off power supply to heat lamp when over heat condition is
determined.
No.
Name
Function and operation
1
Heat roller
Applies heat and pressure to toner on paper to fuse it on paper.
2
Upper separation pawl
Mechanically separates paper which was not naturally separated from the heat roller (heating).
3
Pressure roller
Presses toner on paper to fuse.
4
Lower separation pawl
Mechanically separates paper which was not naturally separated from the heat roller (heating).
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