Ricoh FT4480 Field Service Manual page 211

15 March 1987
2. Straight Sharp Lines
- Possible Causes -
• Drum scratched
• Cleaning blade damaged
• Cleaning brush worn
• Hot roller scratched
• Hot roller strippers worn
- Action -
Start a copy cycle and stop it before the copy reaches the fusing unit.
Do the same lines exist on the unused copy?
Y N
I
If the surface of the hot roller is scratched, which part is scratch-
ing the hot roller surface?
• Oil Blade
• Hot Roller Strippers
• Other
Clean, correct, and/or replace any parts which scratch the hot
roller. If the hot roller strippers are badly stained with toner,
check and adjust the fusing temperature. Then, replace the hot
roller.
Is the drum scratched?
Y N
I
Follow troubleshooting section "Uneven Density 1) Uneven density
appears in bands."
Correct or replace any parts scratching the drum surface.
• Cleaning entrance
• Cleaning brush
• Brush seals which
Are there any foreign
the drum potential?
Y N
I
• Clean the edge of the cleaning blade. Check that the movement of
the blade cleaner is smooth and the cleaner edge is straight.
• Clean all seals.
Remove the foreign substances.
seal--wavy, bent, burrs
contact the drum
substances around the drum that may cause leaking of
9-6