AR-810 (serv.man14). Process section - Sharp Copying Equipment Service Manual (repair manual). Page 2

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AR-651/810  PROCESS SECTION  10 - 2
10. 2.  Functions
(1) Drum
The drum is a cylindrical aluminum base which has thinly applied to it an organic photosensitive mate-
rial. The photosensitive material produces an electrical current when exposed to light. The amount of
current produced is indirect proportion to the light intensity and exposure time.
(2) Main charger
The main charger is configured by stretching a thin wire between two insulation blocks provided at both
ends of the U-shaped metal housing.
When a high voltage is applied to the charger wire, the air around the wire is ionized (electro-statically
charged), and this ionized air is attracted onto the drum’s surface. This phenomenon is referred to as a
“corona discharge”. In the dark, the surface of the drum is negatively (–) charged by the corona dis-
charge of the main charger.
(3) Charger wire cleaner
The charger wire cleaner removes contamination collected on the charger wire. It moves backward and
forward to clean the charger wire after the power is turned ON and more than 2000 continuous copies
have been made since the door switch was turned ON or the previous cleaning operation was per-
formed.
(4) Discharge lamp
Discharging is the process of reducing or eliminating unwanted electrostatic charges on the drum.
The discharge lamp has two effects, a cleaning effect and pre-exposure effect. By the cleaning effect, it
neutralizes and eliminates the residual charges on the drum surface by exposing it to light. The pre-
exposure effect ensures a fixed drum surface potential before the next charging process.
(5) Ozone filter
The ozone filter decomposes ozone by exposing it to activated charcoll the ozone has been generated
through the corona discharge of the main charger, and is forced through the filter by the exhaust fan.
(6) Surface potential sensor
The surface potential sensor detects the surface potential of the OPC drum and controls it to keep the
copy quality constant.
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