Unexpected Density Drop If "Dens. Adj. Per Paper" Set Positive (+) Value - Konica Minolta AccurioPress C2070 Troubleshooting Manual

1.3.5. Unexpected density drop if "Dens. Adj. Per Paper" set
positive (+) value
(1) Symptom
If printing continuously in high coverage image with setting "Dens. Adj. Per Paper" to positive
(+) value, there are potential of unexpected density drop as following. Around 10 prints from
start, print image density starts decreasing to the extent it is not visible. Then the density drop
is going to be visible gradually if the same job is continued on same condition. (The level and
number of print to be visible depends on its setting and coverage)
[Paper Setting]→[Expert Adj.]→[Dens.Adj. Per Tray(YMC)]/[Dens. Adj. Per Tray(K)]
NOTE: When the paper setting was recalled by [Evenness+2]/[Evenness+3]/[Evenness+4]
button from [Preset], both [Dens. Adj. Per Paper] were set to positive (+) together.
Button name and advanced setting
Button Name
Evenness + 1
Evenness + 2
Evenness+ 3
Evenness+ 4
(2) Cause
Setting [Dens. Adj. Per Paper] for positive (+) value makes toner consumption increase than
standard setting because toner amount on paper increases. If high coverage image was
printed on this setting, the toner density in the developing unit might decrease. Then printing
image density drop appeared finally. The following table shows potential risk area in yellow
about affecting [Dens. Adj. Per Paper] and color coverage on image.
Coverage on image
(%)
60
70
80
90
OK: Having no potential for the problem, Potential: Having potential for the problem
(3) Solution
1. Print No.55 chart (Recommended: 5%) by 100 pages,. (After this printing, perform
[Gamma Automatic Adj.].)
If customer do not accept 100 pages prints, perform [Auto Gamma Adjustment] 3 or 5
times.
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Fusing roller(Up) Temperature
No increase in temp.
when print start.
def. value (±0)
def. value (±0)
def. value (±0)
Dens. Adj. Per Paper (Step)
0 +1
OK OK
OK OK
OK OK
OK Potential
- 64 -
Den. Adj. per Tray
(YMC, K)
def. value
+1
+2
+3
+2 +3
OK OK
OK Potential
Potential Potential
Potential Potential