Epson AcuLaser Color 2000 Service Manual page 81

EPSON AcuLaser C2000
Pre-Transfer Erase
Pre-transfer erase eliminates the electricity where no toner is on.
24 eraser lamp (LED) is located in one line on the AIDC/Eraser Board. They
lights the surface of the OPC drum after development.
Eraser Lamp
Figure 2-23. Pre-Transfer Erase
Humidity Sensor
Humidity sensor (HS1) rear bottom of the mechanism measures the
humidity and temperature of the outside of the mechanism. CPU reads
this data and determine the transfer bias.
Operating Principles
Transfer Belt Unit
OPC Drum
Printing Process
Humidity
Sensor (HS1)
Figure 2-24. Humidity Sensor
AIDC (Automatic Image Density COntrol)
AIDC detects AIDC mark density made on the OPC drum by AIDC sensor
that is located at the same position with eraser lamp and determines the
appropriate development bias at printing.
AIDC density detection is performed by a set of LED and 2 photo
sensors.
AIDC detection is made for respective toner cartridge when powering
the switch on or during the pre-rotation when opening or closing the
front top right cover.
Revision C
81