Epson EPL-N1200, Service Manual

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2.1.1.6 Image Transfer
Image transfer is the process of transferring the toner image created on the PC drum to the paper
during the developing process. This printer uses the roller image transfer method, instead of corona
image transfer, as the image transfer process. In roller image transfer, there is no generation of
ozone as there is with corona discharge. Also, there is no blurring caused by motion in the image
transfer, because the image transfer roller is maintained for the pressure bonding of the paper with
the PC drum.
A reverse bias voltage is applied so that the positive toner is not transferred onto the image transfer
roller. (The drum charge bias voltage is used.)
2.1.1.7 Fusing
Fusing is the process of fixing the toner image transferred during the image transfer process onto
the paper. This printer uses the heating roller method for fusing. The heating roller method fixes
the toner image with an upper fusing roller that is heated by the heater lamp.
The thermistor (TH1) detects the temperature of the upper fusing roller and the value is fed back to
the PWB-A board to controls On/Off operation of the heater lamp.
If the thermostat (S3) detects 210° C (410° F), inside the terminal, S3 goes open and cut the
current off to the heater lamp (H1).
2.1.1.8 Paper Exit
The paper on which the toner image has been fused is fed to the face-down tray.
Figure 2-8. Image Transfer
Figure 2-9. Fusing
Operating Principles EPL-N1200 Service Manual
2-6 Rev. A