Oki ES3640MFP Service & Troubleshooting Manual page 70

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
Areas of the Printer that Apply to Process Direction Bands, Voids, or Streaks
1. Run the Remove Print Smears routine from the printers Control Panel. Did this
fix the problem?
2. Are there any obstructions, dirt or debris in the printer's paper path? Check for
toner spills.
3. Visual inspect the Imaging Units and rollers for damage.
4. Clean the Fuser where paper enters. Did this fix the problem?
5. Verify the ribbon cables and wiring harnesses on the LED Heads are seated,
connected and routed properly.
6. Print a test print Did the test pattern print correctly?
Print Quality Troubleshooting Practices
Imaging Unit
Transfer Unit belt
Troubleshooting Steps Resolution
Yes – Complete
No - Go to Step 2.
Yes – Clean and remove
obstructions.
No - Go to Step 3.
Yes – Replace the Imaging Unit.
No - Go to Step 4.
Yes – Complete
No - Go to Step 5.
Yes – Go to Step 6.
No - Reseat, re-route any
damaged wiring harnesses.
Yes – Replace the Fiery Control
Board
No - Replace Engine Control
Board