Lexmark X500N, Service Manual

Page: 97 / 244

Diagnostic information
2-59
7100-XXX
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 4-47 .
• 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 4-28 .
• 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 4-5 ). Replace cleaning roller. See “Transfer belt
cleaning roller removal” on page 4-4 . 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.
3 Toner cartridge Replace faulty toner cartridge.