MX-C250 ADJUSTMENTS 5 – 27
(Though the following items affect the color balance/density,
there is no need to adjust them frequently. When, however, a
trouble occurs, they must be checked and adjusted.)
1)
The following items must be adjusted properly.
Note for the color balance/density check and adjustments
- For the color balance adjustments, be sure to use the paper
specified for color (recommended paper).
Note that, if another kind of paper is used for the color balance
adjustment, proper image qualities (color balance, density) may
not be obtained.
- When setting the adjustment pattern on the document table in
the automatic color balance adjustment procedures, place 5
sheets of white paper on the adjustment pattern in order to pre-
vent back copying and adverse effects of paper wrinkles as far
as possible.
(2) Relationship between the servicing job contents and the
color balance/density check and adjustment
Note that the jobs before and after execution of the color balance/
density check and adjustment depend on the machine status and
the servicing conditions.
Follow the flowchart of the color balance/density adjustment proce-
dures depending on the actual conditions.
There are following four, major cases.
1)
When installing
2)
When a periodic maintenance is performed.
3)
When a repair, an inspection, or a maintenance is performed.
(When a consumable part is replaced.)
4)
When an installation, a repair, or inspection is performed.
(Without replacement of a consumable part)
(3) Copy color balance and density check
Before checking the copy color balance and density, be sure to
execute the following jobs.
* Execute the high density image correction (Process correction)
forcibly. (SIM 44-6)
* Execute the half-tone image correction forcibly. (SIM 44-26)
Method 1
Make a copy of the gray test chart (UKOG-0162FCZZ) and a copy
of the servicing color test chart (UKOG-0326FCZZ/UKOG-
0326FC11), and check that they are proper.
a. Note for execution of the color balance and density check
in the color copy mode
To check the copy color balance and density, use the gray test
chart (UKOG-0162FCZZ) and the servicing color test chart
(UKOG-0326FCZZ/UKOG-0326FC11). Set the copy density
level to "3" in the Text/Printed Photo mode (Manual), and make
a copy.
At that time, all the color balance adjustments in the user
adjustment mode must be set to the default (center).
In addition, be sure to use the specified paper for color.
b. Note for checking the monochrome copy mode density
To check the density, use the gray test chart (UKOG-
0162FCZZ). Set the copy density level to "Manual 3" in the Text/
Printed Photo mode (Manual).
In addition, all the color balance adjustments in the user
adjustment mode must be set to the default (center).
Check with the gray test chart (UKOG-0162FCZZ)
In the copy density check with the gray test chart, check to insure
the following conditions.
For the color (gray) balance, use the servicing color test chart
(UKOG-0326FCZZ/UKOG-0326FC11) to check.
Check with the servicing color test chart (UKOG-0326FCZZ/
UKOG-0326FC11)
In the copy color balance check with the servicing color test chart,
check to insure the following conditions.
Jo
b
No
Adjustment item
Simula-
tion
AD
J 5
Print engine image distortion adjustment /
OPC drum phase adjustment / Color registra-
tion adjustment (Print engine section)
50-22/20
Job
No
Adjustment item
Simu-
lation
ADJ 1
Adjusting high
voltage values
ADJ
1A
Adjust the main
charger grid voltage
8-2
ADJ
1B
Adjust the develop-
ing bias voltage
8-1
ADJ
1C
Transfer current and
voltage adjustment
8-6
ADJ 6
Scan image focus adjustment
48-1
1
2
3
4
5
6
7
8
9
10
W
SHARP GRAY CHART
SHARP gray chart
Patch 1 is
slightly copied.
Patch 2 is copied.
(Color copy)
1
2
3
4
5
6
7
8
9
10
W
SHARP GRAY CHART
SHARP gray chart
Patch 1 is not copied.
Patch 2 is
slightly copied.
Patch 3 is copied.
(Black-and-white copy)
Serviceman chart (Color patch section)
The densities of patches 1 - 6 of
each color are properly balanced.
Patch 7 is slightly
copied or not copied.
(Color copy)
