Toshiba e-STUDIO555 Service Manual page 94

(9) Discharging
Discharging is a process of eliminating the (-) charge remaining on the photoconductive drum before
the next charging process begins.
If discharging does not occur, the following phenomenon will occur:
The (-) charge remains on the photoconductive drum.
↓
Uneven charge is applied to the drum during the next copy.
↓
The next copy has a double image.
(Preceding image appears.)
Solution:
Expose the entire surface of the photoconductive drum to the light by the discharge LED array.
↓
The photoconductive drum becomes electrically conductive.
↓
All the (-) charges remaining on the photoconductive drum are conducted to the ground.
↓
The preparation for the next copy is completed.
e-STUDIO555/655/755/855
COPY PROCESS
Discharge LED array
Fig. 3-21
3 - 10
Drum
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