Lead Edge Erase; Side Erase - Ricoh A219 Service Manual

ERASE

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.)
-Platen Mode-
Blocks On Paper Size
None
a to b
11" x 17",
a to c
11" x 8
1/2
a to d
B4, B5
a to e
sideways
a to f
a to g
8 " x 11",
1/2
a to h
8 " x 5
1/2 1/2
A4
a to i
Lengthwise
a to j
a to k B5
a to l
a to m
Lead Edge and Trail Edge
All (a to n)
Erase
A219
CÓPIA NÃO CONTROLADA
-DF Mode-
Reproduction
Ratio (%)
99% to 200%
95% to 98%
92% to 94%
"
88% to 91%
84% to 87%
80% to 83%
75% to 79%
72% to 74%
"
68% to 71%
63% to 67%
59% to 62%
54% to 58%
50% to 53%
2-16
CÓPIA NÃO CONTROLADA
Blocks On Paper Size
None
a to b
11" x 17",
a to c
11" x 8 "
1/2
a to d
B4, B5
a to e
sideways
a to f
a to g
8 " x 11",
1/2
a to h
8 " x 5 "
1/2 1/2
A4
a to i
Lengthwise
a to j
a to k B5
a to l
a to m
Lead Edge and Trail Edge
All (a to n)
Erase
Reproduction
Ratio (%)
99% to 200%
97% to 98%
93% to 96%
90% to 92%
86% to 89%
81% to 85%
77% to 80%
73% to 76%
70% to 72%
65% to 69%
61% to 64%
56% to 60%
50% to 55%
SM