2-116 Service Manual
5021-0XX
Toner drop service check
A toner spot stain on paper is caused by ambient toner within printer
engine.
Problem area Action
1 Waste toner feed system
• Waste toner auger
• Waste toner feeder
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.
2 Transfer unit cleaning roller 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.
