Epson EPL-N2000, Service Manual

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2.1.1.6 Cleaning Process
Toner remaining on the PC drum after transfer process is scraped off with the cleaning blade,
placed in close contact with the surface of the PC drum. The toner that has been scraped off is
collected back into the toner collection box inside the Imaging cartridge.
2.1.2 Engine Mechanism Operation
This section describes the major units in the engine and their mechanisms.
2.1.2.1 Fusing Unit
❏
Upper fusing roller
A metallic sleeve roller that melts the toner on the paper. It is heated by a heater lamp built
internally.
❏
Lower fusing roller
A silicon rubber roller that applies pressure to the paper for fusing the toner to the page.
❏
Heater lamp
A lamp built into the upper fusing roller. This is supplied AC power to heat the upper fusing
roller.
❏
Thermistor
The thermistor, located next to the upper fusing roller, detects the roller’s surface temperature.
To control the roller’s temperature, the control circuit alternately switches the heater lamp on
and off based on the temperature the thermistor detects. (This process continues occurring as
long as the thermostat does not detect overheating.)
❏
Thermostat
When the thermistor fails to control the temperature, the thermostat takes over the job. The
thermostat has a series connection to the heater lamp’s power source line, and when the
temperature rises to the specific level, it opens the contact point. Then current is cut off as a
consequence.
EPL-N2000 Service Manual Operating Principles
Rev.A 2-7