C6501 Uneven Density Correction Procedure - Konica Minolta bizhub PRO C6501 Troubleshooting Manual

35 C6501 uneven density correction procedure

[Symptom]
When taking halftone sample, the density at the both sides to the main-scan direction is too
light than the center. Or, the linear density shift appears to the main-scan direction.
[Probable cause]
Uneven density to main scan direction appears due to the environment change and dispersion
of Write Unit.
[Solution]
Form C6501/C6501P/C5501, as the countermeasure against the uneven density to main-scan
direction, [Density adjustment setting] is newly added. Perform following adjustment at the
machine installation/PM
Before performing [Density Evenness Adj.], perform following adjustments.
#1. [Auto gamma adjustment],
・ Service mode => [02 Process Adjustment] => [02 Drum Peculiarity Adj.] => [03 Auto
gamma adjustment]
・ [Adjustment] => [03 Execute Adjust Operation] => [Automatic Gamma Adj.]
* Machine operation is the same for both adjustment operations.
#2. [Color registration adjustment]
・ Service mode => [01 Machine Adjustment] => [01 Printer Adjustment] => [10. Color
registration Adj.]
・ [Adjustment] => [03 Execute Adjust Operation] => [Color Registration Adj.]
* Accuracy of Adjustment is higher in service mode.
#3. [Printer gamma offset adjustment]
・ Service mode => [01 Machine Adjustment] => [03 Quality Adjustment] => [02 Printer
gamma adjustment] => [01 Printer Gamma Offset Adj.]
・ [Utility/Counter] => [03 Machine Admin. Setting] => [01 System Setting] => [05 Expert
Adjustment] => [07 Quality Adjustment] => [01 Printer Gamma Offset Adj.]
Then, perform Density Evenness Adjustment with the following procedure.
#4. [Density Evenness Adjustment]
・ [Utility/Counter] => [User Setting] => [07 Image Quality Setting] => [05Density Evenness
Adj.]
・ [Adjustment] => [05 Density Evenness Adj.]
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