Charge Corona - Ricoh A151 Field Service Manual

8. Always keep the drum in the protective sheet when inserting or pulling
the drum unit out of the copier to avoid exposing it to bright light or direct
sunlight. This will protect the drum from light fatigue.
9. Before pulling out the drum unit, place a sheet of paper under the unit to
catch any spilled toner.
10. When installing a new drum, do the following:
a) Apply setting powder to the entire surface of the drum.
b) Perform the drum initial setting (SP66).
NOTE: This is not necessary at installation of a new machine as the
drum initial setting is performed at the factory.
c) Perform the Vsg adjustment (SP54).
11. Dispose of used drums according to local regulations.

1.3 CHARGE CORONA

1. Clean the corona wire by sliding the corona unit in and out. (The cleaner
pads come into contact with the corona wire when the corona unit is slid
all the way out.) The wire and casing can also be cleaned with water or
dry cloth. Do not use any abrasives or solvents.
2. Do not touch the corona wire and the grid plate with oily hands. Oil stains
may cause uneven image density on copies.
3. Make sure that the corona wire is correctly positioned between the
cleaner pads and that there is no foreign material on the casing.
4. When adjusting the charge corona current, always make sure that the
center of the drum shoe is aligned with the middle of the corona wires.
5. Clean the charge grid with a blower brush (not with a cloth).
6. The corona height should only be adjusted in the following two cases:
a) When the front end block is replaced
b) When the drum charge current is uneven
A151/A152 4-2 FSM