Rippled Uneven Image - Konica Minolta bizhub PRO C6501 Troubleshooting Manual

38 Rippled uneven image

[Symptom]
At the secondary colors (red and blue) overlapping solid parts, unevenness appears to the
main-scan direction.
[Probable cause]
At the overlapping colors (red and blue) if the toner charging amount increases due to the
previous job or ambient factors, the electric charge flows in to the toner at the first transfer.
Consequently, the charge increases in toner layer then peeling discharge occurs after passing
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the 1 transfer nipping.
[Solution]
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By changing the 1 transfer current, reduce the charge in the toner layer to reduce peeling
discharge.
[Utility/Counter] => [03 Machine Admin. Setting] => [01System Setting] => [05 Expert
Adjustment]
=> [06 Process Adjustment] => [01 Front & Back Density]
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The basic solution is, adjust the 1 transfer current for yellow to black by step by step
(decrement by 1 step) and find the condition not to causing the discharge.
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However, the 1 transfer to be adjusted depends on the width of the rippled mark to the
main-scan direction. Therefore, if the symptom cannot be resolved by increasing the transfer
current, also adjust to reduce the value.
CAUTION: If the first transfer current is decreased too much, the white spot may appear.
Please mind it and check the image carefully when performing the adjustment.
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