Ricoh SP 8400DN Field Service Manual page 1368

6.Troubleshooting
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As a side effect, this will shorten the yield of the toner bottle.
Troubleshooting for Blots on Middle Thick Glossy or Coated Paper
Symptom:
Printed images contain blots when using middle thick (or thick) glossy or coated paper.
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This may occur when paper weight is 82 g/m
Cause:
Glossy or coated paper contacts the PCU more closely than plain paper, and using middle thick or thick paper
increases the transfer pressure.
So more dust or blots on the PCU may be transferred to the paper than usual.
These may result in more blots appearing on printouts.
Solution:
1.
Change the following SP modes as shown.
SP3-629-001 (Vc Vsp): Set to 630 (If the symptom still occurs, set to 680)
SP3-629-101 (Vb Vsp): Set to 430 (If the symptom still occurs, set to 480)
2.
Enter SP3-011-001 (Manual ProCon :Exe), and then press [Execute].
Depending on the environment, the printout toner density may decrease.
630
2
or more and its smoothness is 100(S) or more.