Ricoh Pro C7200S Troubleshooting Manual page 584

9.Image Quality Problem: Lines
Uneven Density at 63mm Intervals Caused by the Paper Transfer Bias
Banding (189 mm intervals)
[1]: Drum
[2]: Development Unit
[3]: Drum Cleaning Entrance Seal
Uneven density occurs at the contact area where the opening of the development unit contacts the
drum, and at the closed area where the drum cleaning unit contacts the drum.
Cause
When drastic environmental changes or prolonged disuse occurs after stopping the machine, moisture
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[4]: Drum Cleaning Unit
[5]: Lubrication Blade
[6]:Charge Unit