Image Density Adjustment; Darken Image Density - Konica Minolta bizhub PRO 1050 Service Manual

12. ADJUSTMENT FOR POD
5. Register the front and back of the paper.
There are two modes for the registration, auto-
matic (adjustment) and manual (adjustment).
• Manual registration (adjustment)
• Automatic registration (adjustment)
Press [Chart Adjustment] to execute the auto-
matic registration (adjustment).
6.
When adjusting another tray, repeat the steps 3
to 5.
520
2
Field Service Ver3.0 Nov.2006

12.3 Image density adjustment

12.3.1

Darken image density

Print industry customers may demand image settings
with dark image density in the shadow area such as
the offset printing.
This section describes how to adjust the shadow
area (max. density) to make its image density darker.
If the adjustment to make image density darker is not
performed properly, toner spillage or image back-
ground occurs. By this procedure, the density can be
adjusted more safely, minimizing occurrences of
these problems. However, perform this adjustment
only when necessary.
Related adjustments are as follows.
• Utility mode
1) Image density selection
This setting changes the charger voltage and the
developing bias.
• Service mode
1) DIPSW23-2, 3, 4 toner density of developer
This setting changes the developing roller rota-
tion and toner density, thus changing the toner
density of developer without changing image
density.
2) DIPSW27-2, 3 image density selection (toner con-
trol patch density)
This setting changes the developing bias for cre-
ating the toner control patch formed on the drum
to determine toner density, thus changing toner
density of developer to change image density.
A. Procedure
1.
With the image density selection of the density
setting in the utility mode, set Darker [+1].
2. In the test pattern output mode, output the test
pattern No.11 to check image density.
3.
When image density is insufficient, set the
image density selection "approx. 0.5% up" in
the DIPSW27-2, 3.
4. With the DIPSW23-2, 3, 4 toner density of
developer, set "approx. 0.5% down" or
"approx. 1.0% down" to prevent from image
background and toner spillage.