Oki C9800 Series, Service & Troubleshooting Manual

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Process Direction Lines or Streaks
There are dark lines running along the page in the direction of paper travel from the
leading edge to the trailing edge. This is generally due to Fuser, paper path roller
and/or exit guides contaminated with toner debris.
Initial Actions:
Perform Initial Actions from Print Quality Troubleshooting Practices
Areas of the Printer that Apply to Process Direction Bands, Voids, or Streaks
Imaging Unit
Transfer Unit belt
Troubleshooting Steps Resolution
1. Run the Remove Print Smears routine from the printers Control Panel. Did this
fix the problem?
Yes – Complete
No - Go to Step 2.
2. Are there any obstructions, dirt or debris in the printer’s paper path? Check for
toner spills.
Yes – Clean and remove
obstructions.
No - Go to Step 3.
3. Visual inspect the Imaging Units and rollers for damage. Yes – Replace the Imaging Unit.
No - Go to Step 4.
4. Clean the Fuser where paper enters. Did this fix the problem? Yes – Complete
No - Go to Step 5.
5. Verify the ribbon cables and wiring harnesses on the LED Heads are seated,
connected and routed properly.
Yes – Go to Step 6.
No - Reseat, re-route any
damaged wiring harnesses.
6. Print a test print Did the test pattern print correctly? Yes – Replace the Fiery Control
Board
No - Replace Engine Control
Board