16 April ?88
LEAD EDGE ERASE
The entire line of LEDs turns on when the main motor turns on. They stay on
until the erase margin slightly overlaps the lead edge of originalimage areaon
the drum (Lead Edge Erase Margin). This prevents the toner density sensor
pattern from being developed on every copy cycle and prevents the edge of
the original from appearing on the copy image. The width of the lead edge
erase margin can be adjusted using SP Mode # 41.
During image density detection cycles (once every ten cycles), the center
block of erase lamps turns off long enough for the sensor pattern to be
developed.
SIDE ERASE
Based on the paper size and on the reproduction ratio, the LEDs turn on in
pairs (one on either side) to discharge the drum potential on both sides. This
reduces toner consumption and drum cleaning load.
The CPU adjusts the side erase margin to be as near as possible to the actual
image size, even when using the zoom function. However, since the erase
lamp LEDs will not work in precise one millimeter intervals, the side erase
margin varies slightly depending on the reproduction ratio. The width of the
side erase margin varies from O mm to a maximum of 6 mm (total of both
sides).
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ACEC
