V-40
3.4.2 Setting of Engine NVRAM Data
As data in the NVRAM has been preset to the optimum value at the factory, it is not
necessary to change the preset values under normal conditions. However, fine
adjustment may be required subject to the media or operational conditions.
<Purpose>
Print quality can be improved by changing the preset value in the engine NVRAM.
<Procedures of Setting>
1) Follow the procedures set out in Section 2.3 ‘Service Mode’ in this chapter.
2) Select RAM TUNE UP mode.
3) Select the desired TUNE UP mode.
4) Adjust the preset value to the appropriate value (step).
5) Carry out a test print to confirm the print quality.
<Subject TUNE UP Mode>
Mode Subject of Adjustment Purpose
LP TUNE UP Adjustment of laser power Optical density
THV TUNE UP Adjustment of transfer voltage Transfer efficiency
DBV TUNE UP Adjustment of developer bias Optical density
CBV TUNE UP Adjustment of OPC belt bias Optical density
FBV TUNE UP Adjustment of cleaning roller bias Drum cleaning efficiency
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