Ricoh FT 4015, Service Manual

Page: 197 / 229

1.5 VERTICAL BLACK LINES
- Problem -
Thin black lines appear on the copy.
- Possible Causes -
1. Scratched cleaning blade
2. Dirty or scratched exposure glass or dirty
or scratched mirrors
3. Scratched or dirty drum
4. Scratched hot roller
- Action -
Do the black lines shift when a reduction copy is made?
No Yes
Clean or replace the exposure glass or mirrors. After cleaning the
optics, perform the necessary SP modes in order (see Section 4 -
Service Remarks for details).
Is the edge of the cleaning blade scratched?
No Yes
Replace the cleaning blade.
Is the hot roller scratched?
No Yes
Check whether black lines appear on the copy by stopping the copy
paper in the transport section. If no black lines appear, replace the
hot roller.
Check whether the drum is scratched or toner is built-up on the drum.
Replace the drum if necessary.
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20 December 1996 COPY QUALITY
7-7