Lexmark C510 Service Manual - Page 194
Toner drop service check, Service Manual - drum unit
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5021-0XX Toner drop service check A toner spot stain on paper is caused by ambient toner within printer engine. Problem area 1 Waste toner feed system • Waste toner auger • Waste toner feeder 2 Transfer unit cleaning roller Action Toner drops on the transfer drum due to a breakdown of the waste toner feed system. • Waste toner auger mylar is damaged. Examine and replace if defective. See "Waste toner auger removal" on page 4-72. • Waste toner is not properly collected by waste toner feeder. Check to ensure that waste toner feeder is not compacted. If so, replace waste toner feeder. See "Waste toner feeder removal" on page 4-42. • Check for waste toner in printer. If found, clean and vacuum printer. Cleaning roller is faulty. Remove transfer belt unit (see "Transfer belt unit removal" on page 4-7). Replace cleaning roller. See "Transfer belt cleaning roller removal" on page 4-6. Prior to installation of new cleaning roller, thoroughly clean cleaning roller installation area. Check for waste toner in printer. If found, clean and vacuum printer. 2-116 Service Manual