Kyocera FS-1128MFP Service Manual - Page 134
(9) Dirt on the top edge or back of the paper.
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2JN (9) Dirt on the top edge or back of the paper. Print example Causes ABC 123 Toner contamination in various parts. Defective transfer roller. Check procedures/corrective measures Dirty edges and back of the paper can be caused by toner accumulated on such parts as the paper chute guide, paper conveying paths, the bottom of the drum and developing unit, and the fuser unit inlet. Clean these areas and parts to remove toner. If the transfer roller is contaminated with toner, clean the transfer roller using a vacuum cleaner or by continuously printing a low density page until the symptom has faded away. (10) Undulated printing at the right edge (scanning start position). Print example Causes Defective polygon motor (laser scanner unit). This vertical line should be straight. Defective control PWB. Check procedures/corrective measures Replace the laser scanner unit (See page 1-5-17). Replace the control PWB (See page 1-5-39). 1-4-16