Image Quality Problem - Ricoh SP 311DN Service Manual

Troubleshooting

6.7.2 IMAGE QUALITY PROBLEM

problem
Blurred or too light
Dirty or too dark
Dirty background
Vertical black lines
Vertical White lines
Horizontal black lines
A moire pattern is
produced.
Insufficient fusing
M154/M155/M174/M175/A0A7/M287/M0BB

The polygon mirror of the laser unit is dirty.

Adjust the image density.

Paper is damp. Use paper that has been stored properly.

If you enable [Toner Saving], printing is generally less
dense.
Printer Driver > Print Quality > Toner Saving: Off

Toner is almost depleted. Replace the print cartridge.

Condensation may have collected. If rapid change in
temperature or humidity occurs, use this machine only
after it has acclimatized.

Image density is too high. Adjust the image density.

Toner on the printed surface is not dry.
Do not touch printed surfaces immediately after copying.
Remove freshly printed sheets one by one, taking care
not to touch printed areas.

Replace the print cartridge.

Adjust with "Adjust of Charge Bias" in the SP Mode 3.

The stripper pawls of the fusing Unit are dirty.

Replace the print cartridge.
Toner is almost depleted. Replace the print cartridge.
Humidity level surrounding the machine may be too low.
Refer to "Dark lines in halftone areas at 75mm Intervals".
The original probably has heavily lined or dotted areas.
Switching the setting for image quality between [Photo] and
[Mixed] may eliminate the moire pattern.
Check if the levers for printing on envelopes inside the rear
cover are properly set. Pull up the levers.
6-20
Cause/Solution
SM