5.2 LEADING EDGE AND TRAILING EDGE ERASE
The entire row of LEDs turns on when the main motor turns on. They stay on
until the erase margin slightly overlaps the leading edge of the original image
on the drum (leading edge erase margin). This prevents the shadow of the
original’s leading edge from appearing on the copy paper. This leading edge
erase margin is also necessary for the leading edge of the copy paper to
separate from the hot roller.
When the scanner reaches the return position, the drum charge roller and
the exposure lamp turn off. However, the charged length on the drum
surface is a little longer than the actual original length to make sure that
there is a complete image of the original.
The entire row of LEDs turn on when the trailing edge of the latent image
has passed under the erase lamp unit. This prevents developing
unnecessary parts of the drum surface, reducing toner consumption and the
drum cleaning load.
The LEDs stay on to erase the leading edge of the latent image in the next
copy cycle. After the final copy, the erase lamps turn off at the same time as
the main motor.
The leading and trailing edge margins can be adjusted with SP2-101-001
and SP2-101-002 respectively.
5.3 SIDE ERASE
Based on the combination of copy paper size and the reproduction ratio, the
LEDs turn on in blocks. This prevents the shadow of the original side edge
and the unexposed front and rear sides of the drum surface in reduction
mode from being developed. This reduces toner consumption and the drum
cleaning load.
A156/A160/A162 2-52 STM
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