Konica Minolta AccurioPress C2070 Troubleshooting Manual page 13

1.1.5. White dots from 2
(1) Symptom
Many white dots in the diameter φ0.1 to 1mm occurred.
(2) Cause
While transferring toner from the belt to paper, the resistance difference due to the paper
generates abnormal discharge on the paper at the transfer nip. At the discharge spot on the
paper, the toner repels and white spots appear on print.
(3) Solution
(a) At tray setting, change the 2
1. Change the DIPSW 1-0 from 0 to 1 to show the expert adjustment in the paper setting.
[Service Mode] → [System Setting] →[Software DIPSW Setting] → DIPSW1-0:1
2. Change the 2nd transfer output corresponding to the symptom location.
Machine → [Paper Setting] → [Change Set] → [Expert Adj.]
nd
At 2 Transfer output adjustment, change the value by every +10 and find the
optimum value.
Note:
On the thick paper, the leading edge/trailing edge transfer output is stronger or
weaker than the other part.
To optimize the leading edge/trailing edge, adjust the 2
Transfer-Rear Edge in the same screen.
nd
(b) Change 2 transfer output in the administrator setting.
When the administrator setting is used, the change is applied to all the output.
If the adjustment of tray paper setting is used, the certain rate is added to the tray setting.
[Utility/Counter] → [Administrator Setting] → [System Setting] → [Expert Adjustment] →
[Process Adjustment] → [Front & Back Density]
Check the symptom occurring side and adjust the value of the corresponding side; [2
Transfer Front]] or [2nd Transfer Back].
optimum value.
Note
The transfer output at lead edge and trail edge is stronger/weaker than the other part. To
optimize the leading edge/trailing edge setting,
Like the step (a)-2, adjust the 2
same screen.
(c) Change the 2nd transfer output adj. after changing the DIPSW to increase the 2nd transfer
output range.
[Service] →[System Setting] →[Software DIPSW] Setting→DIPSW107-4:1, DIPSW41-7:1
[Machine] →[Paper setting] →[Change Set] →[Expert: Adj.]
nd
At 2 Transfer output adjustment, change the value by every +10 within the range 50 to
120 and find the optimum value.
(d) Optimize paper state
White dots is effect of the abnormal discharge of the paper. When the paper is exposed
to the ambient air for days or left inside the PFU for days, the paper sometime gets dried
depending on the ambient moisture. Then the symptom tends to occur easily. Try just
unpacked paper.
Table of contents
KONICA MINOLTA Confidential
nd
transfer unit
nd
transfer output
nd
Transfer-Lead Edge and 2nd Transfer-Rear Edge in the
- 12 -
nd
Transfer-Lead Edge and 2nd
Change the value by every - 10% find the
nd