Conditioning: Stage Two - HP LaserJet II Serie Manual De Instrucciones

HP 33440/HP 33449 COMBINED SERVICE MANUAL
CONDITIONING: Stage Two
Mer the drum has been physidly and electridly cleaned, it must be conditioned. The
conditioning process consists of the appliwtion of a uniform negative charge on the surface of the
drum by the Primary Corona Assembly (see Figure 5-6) located inside the EP-S Cartridge. This
– 6 W charge, applied to the corona wire by the High Voltage Power Supply Assembly, creates a
corona eflect. This means that the air surrounding the wire is ionized and no longer acts as an
insulator. Negative charges from the wire migrate to the surface of the drum.
The Primary Corona grid (see Figure 5-6), positioned between the corona wire and the drum,
reWlates the voltige applied to the drum's surface, so that a uniform – 600 V charge is deposited.
The corona grid is connected to a varistor in the High Voltage Power Supply Assembly which
bleeds off any e~ra current which would raise the surface voltage above the desired level.
Primary
Corona
Primary
Grid
Figure 5-6. Primary Corona Assembly
5-7