Gamma/Density Adjustment In The Text - Sharp MX-2300 G Service Manual

20-H Gamma/density adjustment in the text
image edge section (Normally not required)
This adjustment is used to change the reproduction level of text
and outline to an optional level by changing the gamma and the
density at the edge section of text image. The thickness of fine text
and fine lines is changed by this adjustment.
The adjustment result must be checked in the Text/Printed Photo
copy mode (Manual).
This adjustment is enabled only in the Text mode, the Text/Printed
Photo mode, and the Text/Photograph copy mode.
When the default adjustment value is changed, this adjustment is
required in the following cases.
* When a U2 trouble occurs.
* When the MFP PWB is replaced.
* When the EEPROM on the MFP PWB is replaced.
1) Enter the SIM 46-27 mode.
SIMULATION NO.46-27
TEST
COEFFICIENT OF GAMMA SETUP
A xx
BLACK TEXT (SLOPE)
A:
xx
B xx BLACK TEXT (INTERCEPTE)
C xx COLOR TEXT (SLOPE)
1 99
D xx COLOR TEXT (INTERCEPTE)
SIMULATION NO.46-27
TEST
COEFFICIENT OF GAMMA SETUP
A xx
BLACK TEXT (SLOPE)
A: xx
B xx BLACK TEXT (INTERCEPTE)
C xx COLOR TEXT (SLOPE)
1 99
D xx COLOR TEXT (INTERCEPTE)
2) Select an adjustment item with the scroll key.
Display/Item
Content
(Copy mode)
A BLACK TEXT Black text edge area
engine γ curve calculation
(SLOPE)
coefficient (slope) setting
B BLACK TEXT Black text edge area
engine γ curve calculation
(INTERCEPT)
coefficient (density) setting
C COLOR TEXT Color text edge area
engine γ curve calculation
(SLOPE)
coefficient (slope) setting
D COLOR TEXT Color text edge area
engine γ curve calculation
(INTERCEPT)
coefficient (density) setting
E ED TEXT Error diffusion edge area
engine γ curve calculation
(SLOPE)
coefficient (slope) setting
F ED TEXT Error diffusion edge area
engine γ curve calculation
(INTERCEPT)
coefficient (density) setting
CLOSE
OK
10-key
OK
CLOSE
OK
Adjustment Default
range value
1 – 99 50
1 – 99 50
1 – 99 50
1 – 99 50
1 – 99 50
1 – 99 50
MX-2300/2700 N/G ADJUSTMENTS 6 – 44
3) Enter the adjustment value with 10-key.
When the adjustment value of item A, C, or E is changed, the
gamma at the edge area of text and lines is changed.
When the adjustment value is increased, the image contrast at
the edge area of text and lines is increased. When the adjust-
ment value is decreased, the contrast is decreased.
When the adjustment value of item B, D, or F is increased, the
image density at the edge area of text and lines is increased.
When the value is decreased, the density is decreased.
4) Press [OK] key.
5) Press [CLOSE] key to exit from the simulation.
6) Make a copy in the TEXT/Printed Photo copy mode (Manual),
and check the copy.
Use a document with fine text and line images for copying and
checking.
If a satisfactory result is not obtained, return to the SIM 46-27
mode and change the adjustment value.
Repeat the above procedures until a satisfactory result is
0
obtained.
20-I Copy color balance adjustment (Single
color copy mode) (Normally not required)
This adjustment is used to set the color balance and the density in
the single color copy mode to the user's request.
The adjustment is made by changing YMC components of each
color.
This adjustment is not required normally, but executed when there
is a request from the user.
When the default adjustment value is changed, this adjustment is
required in the following cases.
* When the CCD unit is replaced.
* When a U2 trouble occurs.
0
* When the MFP PWB is replaced.
* When the EEPROM on the MFP PWB is replaced.
a. Adjustment procedures
1) Enter the SIM 46-25 mode.
SIMULATION NO.46-25
TEST
SINGLE COLOR MODE COLOR BALANCE SETUP
A:
xxx
0 255
K C
SIMULATION NO.46-25
TEST
SINGLE COLOR MODE COLOR BALANCE SETUP
A:
xxx
0 255
K C
2) Select the color to be adjusted with the scroll key.
3) Select the color (YMC) to be adjusted with the color key.
A x x x
RED
B xxx GREEN
C xxx BLUE
D xxx YELLOW
M Y
10-key
OK
A xxx
RED
B xxx GREEN
C xxx BLUE
D xxx YELLOW
M Y
0
CLOSE
OK
0
CLOSE
OK