Ricoh A220 Service Manual page 295

PREVENTIVE MAINTENANCE SCHEDULE
Development Developer
Unit
Bias Terminal
Fusing Unit Thermistor
Stripper Pawls
Fusing Entrance and
Exit Guides
Oil Supply Roller
Pressure Roller
Cleaning Roller
Oil Supply Roller
Cleaning Roller
Oil Supply Cleaning
Blade
Duplex Unit Separation/Feed/
Transport Rollers and
Separation Belts
Others Ozone Filter
Dust Protection Filter
(70 CPM version only)
DJF Transport Belt
Pick-up Roller, Feed
Roller, Separation Belt
Item Explanation
The tribo-chargeability of overused developer
decreases. This results in toner scattering.
Developer must be replaced at regular intervals.
Less lubricant increases the friction between the
bias terminal and the bias receptacle. This may
degrade the terminal.
If toner accumulates on the thermistor, fusing
temperature control may not be accurate. Clean
the thermistor at regular intervals.
Toner or dust adhering to the stripper pawls can
cause a paper jam. Clean or replace the pawls at
regular intervals.
Toner piling up on the guide plate will cause dirty
background on the copy or paper jam. Clean the
guide plate at regular intervals.
If the oil inside is used up, toner and paper
powder adheres to the surface of the hot roller
resulting in hot-offset problems.
An excessively dirty cleaning roller applies a
heavy load to the fusing/duplex drive roller,
resulting in SC520.
An excessively dirty cleaning roller cannot clean
foreign substance off the oil supply roller. This
causes stains on the copy.
An excessively dirty cleaning blade cannot clean
foreign substance off the oil supply roller. This
causes stains on the copy.
If paper dust adheres to the
separation/feed/transport rollers and the
separation belts, paper may not feed correctly, or
skewing may result. Replacement is required at
regular intervals.
When an ozone filter deteriorates, ozone
produced in the copier will not be absorbed,
causing headaches, irritation, or other discomfort.
Replace at regular intervals.
After the dust protection filter has absorbed a lot
of foreign material, sufficient cool air cannot be
supplied by the drum cooling fan. Toner may be
clogged in the cleaning unit.
A dirty transport belt can leave stains on copies.
Replace the belt at regular intervals.
When dirty, these rollers and this belt can leave
stains on the copy paper. Also, original misfeeds
or multi-feeds may occur. Replace these parts at
regular intervals.
4-64
15 July 1996