Troubleshooting for Banding at Random Intervals Caused by Lubricant Falling from the Drum Cleaning Unit

Symptom

Banding appears on the printouts at random intervals.

Cause

The lubricant in the drum cleaning unit falls into the registration unit and creates smudges on the ITB encoder sensor. As a result, the engine speed cannot be controlled correctly.

Solution

Clean the ITB encoder with a blower brush.