Ccd Gamma Adjustment (Ccd Calibration) - Sharp MX-2300 G Service Manual

(3) Copy color balance and density check
(Note)
Before checking the coy color balance and density, be sure to exe-
cute 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)
Make a copy of the gray test chart (UKOG-0162FCZZ) and a copy
of the servicing color test chart (UK0G-0283FCZZ), 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 (UK0G-
0283FCZZ). 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 adjust-
ment 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 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.
NOTE: For the color (gray) balance, use the servicing color test
chart (UKOG-0283FCZZ) to check.
(Color copy)
Patch 1 is
SHARP gray chart
slightly copied.
SHARP GRAY CHART
1 2 3 4 5
Patch 2 is copied.
(Black-and-white copy)
Patch 2 is
SHARP gray chart
slightly copied.
SHARP GRAY CHART
1 2 3 4 5
Patch 3 is copied.
Patch 1 is not copied.
• Check with the servicing color test chart (UK0G-0283FCZZ)
In the copy color balance check with the servicing color test chart,
check to insure the following conditions.
(Color copy)
Serviceman chart (Color patch section)
The densities of patches 1 – 6 of
each color are properly balanced.
6 7 8 9 10 W
6 7 8 9 W
10
Patch 7 is slightly
copied or not copied.
MX-2300/2700 N/G ADJUSTMENTS 6 – 34
20-A CCD gamma adjustment (CCD calibration)
(Normal document copy mode)
This adjustment is required in the following cases:
* When the CCD unit is replaced.
* When a U2 trouble occurs.
* When the scanner control PWB is replaced.
* When the EEPROM on the scanner control PWB is replaced.
(1) Note before adjustment
1) Check that the table glass, No. 1, 2, 3 mirrors, and the lens
surface are free from dirt and dust. (If there is some dust and
dirt, wipe and clean with alcohol.
2) 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 they are dirty, clean them.
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
CCD gamma to the default. In this case, however, the adjust-
ment accuracy is lower when compared with the adjustment
method using the SIT chart.
NOTE:
• Check to insure that the SIT chart (UKOG-0280FCZZ or
UKOG-0280FCZ1) is in close contact with the document
table.
• UKOG-0280FCZZ is equivalent to UKOG-0280FCZ1.
2) Enter the SIM 63-03 mode and press [EXECUTE] key.
The automatic adjustment is started. During the adjustment,
[EXECUTE] key is highlighted. After completion of the adjust-
ment, [EXECUTE] key returns to the normal display.
SIMULATION NO.63-03
TEST
SCANNER COLOR BALANCE AUTO ADJUSUTMENT
OC #1:197, #2:185, #3:165, #4:148, #5:117, #6:110,
#7: 88, #8: 75, #9: 55, #10: 45, #11: 38, #12: 29,
#13: 27, #14: 21, #15: 18, #:16:15, #17: 10, #18: 8,
#19: 5, #20: 4, #22: 2, #:24: 2
B G
R
NOTE:
Since the SIT chart (UKOG-0280FCZZ) is easily discolored by
sunlight (especially ultraviolet rays) and humidity and tempera-
ture, put it in a bag such as a clear file) and store in a dark
place of low temperature and low humidity.
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