Sharp MX-C250 Service Manual page 64

(Method 2)
Use SIM46-21 to print the color balance adjustment sheet, and
check following image to confirm that the color balance adjustment
is proper.
(4) Printer color balance/density check
Before checking the copy color balance and the density, be sure to
execute the following procedures in advance.
* Execute the high density image correction (Process correction)
forcibly. (SIM 44-6)
* The half-tone image correction is forcibly executed. (SIM 44-26)
Execute SIM 64-5 to print the print test pattern.
Set each set value to the default and press [EXECUTE] key. The
print test pattern is printed.
The print density must be changed gradually from the lighter level
to the darker level. The density changing direction must not be
reversed. The density level of each color must be almost at the
same level.
The print density must be changed gradually from the lighter level
to the darker level. The density changing direction must not be
reversed.
The density level of each color must be almost at the same level.
Patch B may not be copied.
Patch A must not be copied.
If the color balance of each patch of the process black (CMY mixed
color) is slightly shifted to Magenta, it means that the adjustment is
proper. In an actual print mode, it is converted into the natural gray
color balance by the color table. (When the color balance target is
DEF 1.)
9-A Scanner calibration (CIS calibration)
This adjustment must be performed in the following cases:
* When the CIS unit is replaced.
* When a U2 trouble is occurred.
* When the MFP PWB is replaced.
* When the EEPROM on the MFPC PWB is replaced.
(1) Note before adjustment
- Check that the table glass and the lens surface are free from dirt
and dust.
(If there is some dust and dirt, wipe and clean. A lens should
never be cleaned with alcohol as the alcohol may damage the
(yellow) coatings on the lens. Table glass should be cleaned with
glass cleaner that has no ammonia it it. It is also preferable to
use a glass cleaner with an anti-static additive in it.)
- Check to confirm that the patches in BK1 and BK2 arrays of the
SIT chart (UKOG-0280FCZZ or UKOG-0280FCZ1) are free from
dirt and scratches.
If the patches are dirty, clean the chart surface area with a soft
dry rag.
If they are scratched or streaked, replace with new one.
(2) Adjustment procedures
1) Set the SIT chart (UKOG-0280FCZZ or UKOG-0280FCZ1) to
the reference position on the left rear frame side of the docu-
ment table.
Set the chart so that the lighter density side of the patch is on
the left side.
If the SIT chart is not available, execute SIM 63-5 to set the
CIS gamma to the default. In this case, however, the adjust-
ment accuracy is lower when compared with the adjustment
method using the SIT chart.
MX-C250 ADJUSTMENTS 5 – 30