4.2 LEAD EDGE ERASE
The entire line of LEDs turn on when the main motor turns on. They stay on
until the erase margin slightly overlaps the lead edge of the original image
area on the drum (Lead Edge Erase Margin). This prevents the shadow of
the original edge from being developed on the copy. At this point, side erase
starts. The width of the leading erase margin can be adjusted using SP41.
4.3 SIDE ERASE
Based on the combination of copy paper size and the reproduction ratio data,
the LEDs turn on in blocks (labeled "a" to "n" on the previous page). This
reduces drum cleaning load.
Also, to prevent horizontal black lines from appearing on the edge of copies
as a result of light leaking under the edge of the DF belt, the side erase
combination is changed between platen mode and DF mode; in DF mode,
more of the image is erased at the sides. (The setting of SP24 must be 0.)
Blocks On Paper Size
Reproduction
Ratio (%)
None 99% to 200%
a to b 95% to 98%
a to c
11" x 17",
11" x 8
1/2
"
92% to 94%
a to d 88% to 91%
a to e
B4, B5
sideways
84% to 87%
a to f 80% to 83%
a to g 75% to 79%
a to h
8
1/2
" x 11",
8
1/2
" x 5
1/2
"
72% to 74%
a to i
A4
Lengthwise
68% to 71%
a to j 63% to 67%
a to k B5 59% to 62%
a to l 54% to 58%
a to m 50% to 53%
All (a to n)
Lead Edge and Trail Edge
Erase
-Platen Mode-
Blocks On Paper Size
Reproduction
Ratio (%)
None 99% to 200%
a to b 97% to 98%
a to c
11" x 17",
11" x 8
1/2
"
93% to 96%
a to d 90% to 92%
a to e
B4, B5
sideways
86% to 89%
a to f 81% to 85%
a to g 77% to 80%
a to h
8
1/2
" x 11",
8
1/2
" x 5
1/2
"
73% to 76%
a to i
A4
Lengthwise
70% to 72%
a to j 65% to 69%
a to k B5 61% to 64%
a to l 56% to 60%
a to m 50% to 55%
All (a to n)
Lead Edge and Trail Edge
Erase
-DF Mode-
ERASE 20 December 1996
2-16
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