Xerox 1235DT - Phaser Color Solid Ink Printer, Service Manual

Page: 90 / 239

Service Guide 77
Adjusting color density and balance
Over the life of the printer, colors may change. For example, reds may begin to
take on a purple cast, or blues may take on a green cast. This happens during the
normal use of a color printer and can be easily remedied by using the color
adjustment procedure described in this section
This front panel procedure involves printing a test page and adjusting the
densities and colors based on the appearance of the test page. You may need to
repeat this procedure and test your adjustments until you achieve the desired
effect.
Note
At any time, you can reset the printer to the factory defaults by
selecting
Color Defaults
from the Color Adjust Menu.
Printing a Test Page
1. Press the Menu (1, 5) keys until you see
Color Adjust
.
2. Press Item (2, 6) keys and the printer prints the Color Balance test print.
Interpreting the Color Balance test print
The Color Balance test print contains
numbered images that indicate possible
adjustments that can be made. You can
choose to make an adjustment to the Color
Density, the Black Density, or the Color
Balance.
■
The Black Density Images, numbered
-3K...0,...+3K, show a
lightness/darkness range of 30%
halftones using black only.
■
The Color Density Images, numbered
-3CMY...0,...+3CMY, show a
lightness/darkness range of 30% gray
halftones using three colors (cyan,
magenta, yellow).
■
The Color Balance Images, numbered
0,10,11,...21, show variations of
three-color gray. Each of these circles
contains gray with tints of other colors.
Color Balance and Density Adjustment Test
Xerox Corporation, 2000 ver 1.1
18
17
12
11
19
13
10
16
14
15
20
21
Current
0
abcdef abcdef abcdef abcdef
abcdef abcdef abcdef abcdef
Step 1. Adjust Black Density until ìCurrentì = 30% Black Halftone. Repeat as needed.
BLACK / GRAYSCALE
- 3K - 2K - 1K +1K +2K +3K
Current
0
Decrease Increase
Developer Bias Range: [251 - 550]
Current Black Level:
Current Cyan Level:
Current Magenta Level:
Current Yellow Level:
Density Rate Set Points Range: [80 - 100]
Current Black Level:
Current Cyan Level:
Current Magenta Level:
Current Yellow Level:
Gray Reference
(30% Black Halfto
Step 3. Adjust Color Balance to match ìCurrent Circleì with Gray Reference . Repeat as needed.
Step 2. Adjust Color Density to match Black Density Squares from Step 1. Repeat as needed.
CYAN + M YELLOW
- 3CMY +2CMY +1CMY - 1CMY - 2CMY +3CM
Current
0
Decrease Increase
Step 4. Iterate between Step 2 and Step 3 as needed.