Ricoh FT4460, Service Manual, Page: 167 / 413

28 February 1989
3. Image density sensor adjustment is required in the following cases:
a) The ID sensor is replaced.
b)
The system control board is replaced.
c)
The drum has been replaced and Vsg is out of
specification.
d)
Problems with toner supply have occurred and the ID
sensor check shows Vsg to be out of specification.
e) Exposure lamp voltage is changed.
2.6 TRANSFER and SEPARATION
1. Clean the corona wires with a dry cloth.
2. When adjusting the drum current, always make sure that the axis of the
drum shoe is aligned with the corona wire.
2.7 CLEANING UNIT
1.
2.
3 .
4.
When servicing, be careful not to damage the edge of the cleaning blade.
Do not touch the cleaning brush with your bare hands.
Before pulling out the cleaning unit, place a sheet of paper under it to
catch any toner that spills out.
When inserting the cleaning unit into the copier, be sure the cleaning unit
rail is properly engaged with the unit guide rail on the copier.
2.8 FUSING UNIT
1.
2.
3 .
4.
Be careful not to damage the edge of the hot roller strippers or their ten-
sion springs.
Do not touch the fusing lamp with bare hands.
Make sure that the fusing lamp does not touch the inner surface of the hot
roller.
When paper creasing occurs, adjust the position of the entrance guide
plate or the fusing pressure.
2.9 PAPER FEED
1.
2.
When replacing the friction pad, make sure that the friction pad is below
the surface of the front lip of the pad holder.
When reinstalling the support bracket after cleaning the registration sen-
sor, make sure that the bracket is properly engaged with the groove of the
registration clutch retainer.
4-7