Oki ES3640MFP Service & Troubleshooting Manual page 68

Scan Direction Bands, Voids, or Streaks
There are areas of the image that are extremely light or are missing entirely. The missing
areas form bands that run along the page from the leading edge to the trailing edge in the
direction of paper travel.
Initial Actions:
Perform Initial Actions from
Areas of the Printer that Apply to Scan Direction Bands, Voids, or Streaks
1. Print the 100% Solid Fill test print. Are the missing bands in the process
direction?
2. Are there any obstructions, dirt or debris in the printer's paper path?
3. Clean the LED Heads with at dry, lint free cloth. Did this fix the problem?
4. Remove the each Toner Cartridge and check for toner starvation within the
Imaging Unit(s).
5. Swap the LED Head of the problem color with any other LED Head. Print a Solid
Fill Test Pattern. Has the problem moved with the LED Head?
6. Swap the Imaging Unit of the problem color with any other Imaging Unit.
NOTE: Remove the keys before swapping. Print a Solid Fill Test Pattern to check
for defects. Has the problem color moved with the
Imaging Unit?
7. Check the Fuser for damage.
Print Quality Troubleshooting Practices
Imaging Unit
Transfer Unit belt
LED Heads
Troubleshooting Steps Resolution
Yes – Go to Step 2.
No - See "Process Direction
Bands, Voids, or Streaks" on
page 27.
Yes – Clean or remove
obstructions.
No - Go to Step 3.
Yes – Complete.
No - Go to Step 4.
Yes – Replace the Toner
Cartridge.
No - Go to Step 5.
Yes – Replace the defective LED
Head
No - Go to Step 6.
Yes – Replace the defective
Imaging
Unit.
No - Go to Step 7.
Yes – Replace the Fuser.
No - Replace the Engine Control
Board