Oki ES3640MFP Service & Troubleshooting Manual page 65

Toner on Back of Print
There is toner on the back of the printed sheet of paper.
Initial Actions:
Perform Initial Actions from
Areas of the Printer that Apply to Toner on Back of Print
1. Check and clean the Exit Rollers and paper path for toner or debris. Does this
correct the problem?
2. Verify the printer is operating within its environmental specifications.
3. Inspect the Transfer Unit. Has the cleaning blade flipped or failing to clean the
Transfer Unit?
4. Select the "Special" media setting and experiment with alternate settings, such
as the next heaviest or
lightest paper type. Does this correct the problem?
5. Test the Fuser. Print a test print and monitor the Fuser temperatures. Are
temperatures within specification.
Print Quality Troubleshooting Practices
Imaging Unit
Transfer Unit
Troubleshooting Steps Resolution
Yes – Complete.
No - Go to Step 2.
Yes – Go to Step 3.
No - Advise customer on the
specifications.
Yes – Replace the Transfer Unit.
No - Go to Step 4.
Yes – Complete.
No - Go to Step 5.
Yes – Replace Engine Control
Board
No - Replace the Fuser.