Checking And Cleaning Of Drum Cleaning Blade - Toshiba DP4500 Service Handbook

Note:
1. Application of the patting powder is to reduce friction among the drum, the cleaning blade and the
separation finger. If this process is not performed, the drum and the cleaning blade may be damaged.
2. Remove any fibers or lint adhering to the blade since they can damage the drum and blade, or allows
defective cleaning.
(3) Installation of the copier and storage of the drum
Do not install the copier in a place where it may be exposed to high temperature, high humidity, chemicals
and/or chemical gas.
Do not leave the drum in a brightly lit place for a long time. Otherwise, it would be fatigued and causes
background fogging on the copied image right after it is installed in the machine. However, this phenom-
enon will decrease as time elapses.
(4) Cleaning the drum
At the preventive maintenance, wipe the entire surface of the drum softly using the specified cleaning
cotton (dry soft pad). Use sufficiently thick cleaning cotton so as not to touch the drum surface directly with
your fingertips or nails. Remove your rings and wristwatch before cleaning so as not to damage the drum.
Do not use organic solvents such as alcohol or silicone oil as they have a bad influence on the drum. Do
not use selenium refresher either.
(5) Scratches on the photoconductive drum surface
If the surface is scratched and the aluminum base is exposed, black spots or streaks will appear on the
copied images. Since those scratches can damage the cleaning blade, replace the drum with a new one.
(6) Used photoconductive drums
Dispose of the used drums following the regulations regarding industrial waste established by your local
municipal office.

4.3 Checking and Cleaning of Drum Cleaning Blade

(1) Handling Precautions
Since the edge of the cleaning blade performs the cleaning operation, pay attention to the followings:
• Do not hit or rub the blade edge with anything hard.
• Do not rub the edge with a dry cloth or soft pad.
• Do not stain the edge with oil or fingerprints, etc.
• Do not put solvents such as paint thinner on the blade.
• Do not leave lint or dirt on the blade edge.
• Do not put the blade close to a heat source.
(2) Cleaning
Clean the blade edge softly with a cloth soaked in water and afterwards squeezed hard.
DP4500/3500 SUPPLIES 4 - 2 December 2000 © TOSHIBA TEC