Sharp AR-BC260 Service Manual page 135

ADJ 22B Printer color balance adjustment
(By the key operator program)
Enable when "0" is set in SIM 26-54.
A. Outline
The printer color balance adjustment is used to manually adjust
gradation of Cyan, Magenta, Yellow, and Black in each level of
low, medium, and high density.
The color balance adjustment in the printer mode is generally per-
formed by the user. However, a serviceman can perform this
adjustment more accurately by use of the test chart for servicing.
B. Purpose
As the printer is used, ambient conditions and the depletion of
consumables (the toner cartridge and drum cartridge) can gradu-
ally cause changes to occur in the four color components of color
images, cyan, ma-genta, yellow, and black. This results in devia-
tions in the color balance.
These deviations in the color balance occur gradually over a long
period of time. Ambient conditions (tem-perature and humidity)
and the number of times the printer is used can have a large effect
on color devia-tion.
The printer has two color adjustment functions for the purpose of
correcting deviations in the color balance.
These functions are executed from the key operator programs.
C. Execution conditions
Be sure to perform this adjustment when consumable part is
replaced.
For execution of this adjustment, the print engine section must be
in the normal condition. (All the adjustment items related to the
print engine section must have been adjusted properly.)
D. Color balance adjustment mode
The printer has the following two color balance adjustment func-
tions:
(1) Color balance adjustment
This function is used to adjust each of the density levels (low, mid,
and high) of the four color components, cyan, magenta, yellow
and black.
Use this mode when the color deviation is large.
(2) Easy calibration (Gray balance adjustment)
This mode is used for fine adjustment of the gray balance at the
mid density level of the colors cyan, magenta, and yellow.
Use this mode to correct minor color deviations.
E. Color balance adjustment flow
Use the key operator program on page 3 of the Key Operator's Guide to
print a test page
Do the colors on the test page match the colors on the standard color
chart included with the printer?
No
How much do the colors differ?
Large difference
Using the Color Balance
setings
Print a test page
Color balance is successfully adjusted
Test print: Used to check the current color balance and the gray
level adjustment state. By executing this adjustment, the test page
is printed.
Yes
Small difference
Using Easy Calibration
AR-BC260 SETTING AND ADJUSTMENTS 8 - 42
(Preparation of the test chart)
Cut off the sections between two rows of the test pattern as shown
below cutter.
F. Adjustment details
(1) Color balance adjustment
1) Enter the key operator program mode.
2) Select "Printer setting."
3) Select "Color adjustments."
4) Select "Color balance setting."