Charge Corona - Ricoh FT5233 Service Manual

SERVICE REMARKS
1.2 DRUM UNIT
1. Make sure that the drum unit is set in position and secured with the screw
when the main switch is turned on. If the drum unit is loose, poor contact
of the drum connectors may cause electrical noise, resulting in
unexpected malfunction (RAM data change is the worst case).
2. Clean the green color filter on the drum unit top plate with a dry cloth and
discharge static electricity by touching it with your finger. Do not clean the
filter with water or any other cleaning solution as the filter has an antistatic
coating.
1.3

CHARGE CORONA

1. Clean the corona wires by sliding the corona unit in and out. (The cleaner
pads come into contact with the corona wires when the corona unit is slid
all the way out.) The wires can be also cleaned with water. Do not use
sandpaper or a solvent.
2. Clean the charge corona casing with water first to remove NOx. Then
clean it with alcohol if any toner still remains on the casing.
3. Clean the end blocks with a blower brush first to remove toner and paper
dust. Then clean it with alcohol if any toner still remains on it.
4. Do not touch the corona wires with oily bare hands. Oil stains may cause
white bands on copies.
5. Make sure that the corona wires are correctly positioned between the
cleaner pads and that there is no foreign material (iron filings, etc.) on the
casing.
6. When installing new corona wires, do not bend or scratch the wire
surface to avoid any uneven charge. Also be sure that the corona wires
are correctly positioned in the rear end block and that the damper rings
are correctly positioned in the front end block. (See charge corona wire
replacement.)
7. Clean the charge grid plate with a blower bush (not with a cloth).
8. Do not touch the charge grid plate with oily bare hands. Also, do not bend
the charge grid plate or make any dent on it. Doing so may cause uneven
charge.
9. The corona wire height should only be adjusted when the front end block
is replaced.
4-2
12 February 1992