Ricoh FT4460, Service Manual, Page: 77 / 413

28 February 1989
4. ERASE
4.1 OVERVIEW
LE:
Lead edge erase margin 2.5 ± 1.5 mm
SE : Side erase margin 1.5 ± 1.5 mm on each side;
total of both sides 4 mm or less
Lo: Original width
Lc:
Charged width of drum
EL:
Lead edge erase
ES: Side erase
The erase lamp [A] consists of a line of 120 LEDs extending across the 300
mm width of the drum [C].
The function of the erase lamp is to prevent the toner from being attracted to
the non-image part of the drum and to reduce the load on the cleaning unit.
The erase function is divided into three major erase functions: lead edge
erase, side erase, and editing mode erase.
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