Marks Repeating Down the Page
If the customer tells you that there is a mark (or void) repeating down the printed page,
measure the distance between repeating marks (or voids). Using the chart below, you
can diagnose which of the rollers is causing the problem.
Roller Part Name Repeating Interval
Drum Print Cartridge 3.71 inches
Bias Transfer Roller BTR (service call) 2.00 inches
Heat Roller Fuser Assembly (service call) 3.08 inches
Pressure Roller Fuser Assembly (service call) 3.71 inches
Print Cartridge Contacts
The Print Cartridge has several electrical contacts that should be checked when there
are output problems. The diagram below shows the contacts to check:
Bias Charge Roller
Contact
Conducts voltage required to charge the drum surface with a high
negative charge. If this contact makes poor or no contact, print
quality would range from variable density to pure black
Drum Ground
Contact
This contact is responsible for conducting the charge from
exposed areas of the drum. Poor contact or no contact would
result in output problems ranging from variable density to no data
printed on the page.
Attraction Roller
Contact
The attraction roller is responsible for charging the toner
particles. If this contact were dirty or missing, results would
range from variable density to no data being printed on the page
Bias Charge Roller
Drum Ground
Attraction Roller
Oki Data B6500Support Guide Page 9
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