Canon LBP-1210 Service Manual page 172

CHAPTER 4
cannot be removed, replace the dirty roller.
4) The transfer guide, feed guide or fixing unit entrance guide is dirty.
Action: Clean any dirty areas.
5) The face-down or face-up delivery roller is dirty.
Action: Clean the dirty part. If dirt cannot be removed, replace the dirty roller.
II-7. Black vertical lines
<Possible causes>
1) There is a circumferential scar(s) on the photosensitive drum.
Action: Replace the cartridge.
2) The fixing unit entrance guide is dirty.
Action: Clean the guide.
3) There is a scar(s) on the fixing film.
Action: Rectify the cause of the scar and then replace the fixing film unit.
II-8. Black horizontal lines
<Possible causes>
1) There is a horizontal scar(s) on the photosensitive drum.
Action: Replace the cartridge.
2) The fixing film is dirty, deformed or worn.
Action: Replace the fixing film unit.
II-9. Dirt
<Possible causes>
1) Dirty paper
Action: Replace the paper to new one. Also, instruct the customer on how to store paper.
2) There is periodic dirt (fixing film unit, EP cartridge).
Action: Identify the dirty part according to Table 4-2-2 on page 4-11 and clean it. If the dirt
cannot be removed, replace the dirty part.
3) Dirty pressure roller
Action: If the roller is dirty, clean it. If dirt cannot be removed, replace the roller.
4) The face-down or face-up delivery roller is dirty.
Action: Clean the dirty part. If dirt cannot be removed, replace the dirty roller.
II-10. Blank spots
<Possible causes>
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