Troubleshooting for banding at 2-3mm intervals

Symptom

Banding (uneven density) at 2-3mm intervals

Cause

Vibration of the cleaning unit synchronizes with the vibration generated by the gears that rotate the Cleaning Brush Roller, creating a resonance.

This occurs specifically when the Cleaning Brush Roller rotates at the following 2 speeds, which are defined as “Environment Coefficient 7 & 8” based on the absolute humidity detected internally by the machine.

Reference

Environment Coefficient 1-3: Low temperature and low humidity

Environment Coefficient 4-6: Optimum machine operational condition (laboratory)

Environment Coefficient 7-10: High temperature and high humidity

Solution

Enter the SP mode and modify the environment coefficient set for Environment Coefficient 7 and 8 as shown below.

Note: 1.90 is the default environment coefficient set for Environment Coefficient 9.

IMPORTANT

If you are not sure whether the uneven density problem you are trying to resolve is “Banding at 2-3mm intervals” or not, do the following procedure.

A) Set SP2-225-032 through 041 to “1.50”, and print the job showing the problem.

B) Set SP2-225-032 through 041 to “1.63”, and print the job showing the problem.

C) Set SP2-225-032 through 041 to “1.76”, and print the job showing the problem.

If the problem does not occur in condition A, but occurs either in conditions B or C, the problem is judged to be Banding at 2-3mm intervals.

Side effect

Increased lubricant consumption