Explanation Of Regular Pm - Ricoh FT6645 Manual

23 April 1993

4.2 EXPLANATION OF REGULAR PM

Item
Optics Unit Mirrors, Lens,
Reflector, Exposure
Glass, Platen Cover,
Toner Shield Filter
Exposure Lamp
V , V
D
Patterns
Transfer Transfer Belt
Belt Unit
Belt Drive/
Guide/Bias
Rollers
Cleaning Blade
Paper Feed, Paper Feed Roller,
Registration Pick-up Roller,
Separation Roller
Registration Roller
Paper Dust Cleaner
Registration Sensor
Stains on any part of the optics unit result in black
lines or areas of decreased sharpness on the copy
image. Periodic cleaning is required. The exposure
glass and the platen cover sheet must also be
cleaned. If stains on the platen cover sheet cannot be
removed, it must be replaced.
Deterioration of the exposure lamp affects the copy
image. Check the lamp at regular intervals and
replace if discolored.
, ADS If paper dust or toner accumulates on the V
L
ADS Patterns, the image density cannot be controlled
correctly. This results in light or dark copies. Clean
these patterns at regular intervals.
A dirty or old transfer belt causes poor image transfer
due to its weak chargeability. Clean (both front and
rear sides) or replace the transfer belt at regular
intervals.
Dirty rollers shift the transfer belt to the front or rear.
A dirty or worn out cleaning blade will cause toner to
adhere on the rear side of the copy. The blade must
be replaced at regular intervals.
This machine uses paper trays, a by-pass feed table,
and an LCT for paper feeding. If paper dust adheres
to the paper feed rollers or if these rollers are worn
out, paper may not feed correctly, or skewing may
result. Replacing is required at regular intervals.
A dirty registration roller can cause paper to register
incorrectly, skew, or jam. Cleaning is required at
regular intervals.
Too much paper dust caught in the cleaner causes
paper dust overflow. This results in early deterioration
of the cleaning blade, fusing rollers, etc. Clean at
regular intervals.
A dirty registration sensor causes paper jams. Clean
at regular intervals.
PREVENTIVE MAINTENANCE SCHEDULE
Explanation
4-65
, V ,
D L