Ricoh FT4430 Service Manual page 33

16 April '88
ERASE
OVERVIEW
Lead Edge Erase Margin
Side Margins --
size copies, the total of both side
margins is less than
Original Image width
Charged width on the Drum
Lead Edge Erase
Side Erase
The erase lamp [A] consists of a line of LEDs extending across the full width
of the drum [B].
The erase lamp has three functions: lead edge erase, side erase, and trail
edge erase. Trail edge erase begins after the trailing edge of the copy paper;
therefore, the trailing edge of the copy will not be erased.
The erase lamp unit [A] also has two thermistors: TH-I and TH-2. Both of
these thermistors detect the temperature around the drum. TH-1 selects the
proper rest time compensation, and TH-2 controls the development bias
voltage.
mm. )
4