Charge Corona - Ricoh FT6645 Manual

SERVICE REMARKS
1.2 DRUM UNIT
1. Make sure that the drum unit is set in position and the drum stay is
secured with a 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 malfunctions (RAM data change is the worst
case).
2. To prevent drum scratches, remove the development unit before
removing the drum unit.

1.3 CHARGE CORONA

1. Clean the corona wires with a dry cloth. Do not use sandpaper or solvent.
2. Clean the charge corona casing with water first to remove NO
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 end blocks. (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 an
uneven charge.
4-2
23 April 1993
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