Ricoh pro c901 - Page 445

Technical Bulletin PAGE: 2/2
Reissued:08-Jan-14
Model: Aries-P1.5/C1.5
Date: 25-Dec-13
No.: RM077103a
Cause
In the development process, toner is pulled from the surface of the development roller and
transferred to the photoconductive drum. However, because the rotation speed of the
development roller (Vs) is faster than the rotation speed of the drum (Vp), toner for the
solid image is not transferred accurately to the drum, slightly exceeding the optimum
position and causes the density of the background image adjacent to the leading edge of
the solid image to become higher.
Note: The lower the toner charge level, the higher the risk.
Workaround
There are two workarounds for this symptom. Note the side effects for each workaround.
Workaround
Side effect
Adjust the screening pattern.
e.g. 200dot  175dot or 150dot
Low resolution
Modify the development gamma (capacity) in the following SP for the color
that requires adjustment.
SP3-561-009 ~ 012 (Dev gamma: Disp/Set Actual value)
Default 1.5  1.3
IMPORTANT
Make sure to do the following after the above SP modification.
Execute SP3-820-002 (Manual ProCon Exe Density Adj)
4 times in a row.
(SP3-820-002 is necessary only when SP3-561-009 ~ 012 is modified.）
This will increase the toner charge level and enable higher toner transfer
precision.
Mottled effect