6.

2 Image Quality Adjustment (Copying Function)

6.2.1 Automatic gamma adjustment

When the reproduction of gradation is not appropriate, the gradation reproducibility of all colors Y, M, C
and K can be corrected by performing this automatic gamma adjustment. In case the gradation
reproduction of the image checked is not satisfactory, make this adjustment as described below at parts
replacement.
(1) When unpacking or any of the following parts has been replaced, be sure to make this
adjustment:
• Photoconductive drum
• Developer material
• LED printer head
• LED gap spacer
• Transfer belt
• 1st transfer roller 6
• Drum cleaning blade
• Needle electrode
• Main charger grid
• Image position aligning sensor (Front)
• Image position aligning sensor (Rear)/Image quality sensor
• SRAM board (SYS board)
• EEPROM (LGC board)
• HDD

(2) When any of the following parts are replaced or adjusted, make a copy and check the image to
determine if adjustment is necessary:
• 2nd transfer roller
Notes:
Be sure that this adjustment be made after performing the image adjustment in P. 6-4 "6.1.3
Performing Image Quality Control" and P. 6-6 "6.1.5 Image Dimensional Adjustment".

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON. o Adjustment Mode
(2) Select the A4/LT/A3/LD drawer. Key in the pattern number and press the [FAX] button to output a
“Patch chart for gamma adjustment”.

<Adjustment Mode (05)>

Pattern No. Pattern No. Remark Paper type

4 Color/black integrated When performing code 05-7869 All paper types
200 Color/black integrated When performing code 05-7871-0 Plain paper
204 Color/black integrated When performing code 05-7871-2 Recycled paper
206 Color/black integrated When performing code 05-7871-3 Thick paper1
208 Color/black integrated When performing code 05-7871-4 Thick paper2
214 Color/black integrated When performing code 05-7871-7 Special paper 1
216 Color/black integrated When performing code 05-7871-8 Special paper 2

(3) Place the patch chart for adjustment printed in step (2) face down on the original glass.
Place the chart aligning its side with 2 black squares against the original scale.

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SETTING / ADJUSTMENT
6 - 27
 (4) Key in a code and press the [START] button.
o The scanner reads the chart automatically and performs automatic gamma adjustment
calculation (approx.30 sec.).

<Adjustment Mode (05)>

Code Item to be adjusted Contents

7869 Automatic gamma When the reproduction of gradation is not appropriate, the gradation
(7871) adjustment reproducibility of all colors Y, M, C and K can be corrected by
performing this automatic gamma adjustment. The result of 7869 is
applied to all paper types. The result of 7871 is applied to the
specified paper type.

(5) When the adjustment has finished normally, press the [OK] button to have the adjustment results
reflected.
(To cancel the reflection of adjustment results, press the [CANCEL] button.)
In the case of an abnormal ending, “ADJUSTMENT ERROR” is shown.
Press the [CANCEL] button to clear the error display. When it is cleared, the control panel display
will return to the ready state. Then, check if the patch chart on the original glass is placed in the
wrong direction or if it is placed inclined on the original glass, and then repeat step (3) and
afterward.

Remarks:
To select the paper type for the automatic gamma adjustment in user calibration, change the
code below to "1". (copy/print)

Code Remarks
08-9059 0: No paper selecting buttons displayed
1: Paper selecting buttons displayed. (For both Copy and Printer)

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SETTING / ADJUSTMENT
6 - 28
6.2.2 Density adjustment
The center density and the density variation controlled by density adjustment keys can be adjusted as
follows.

<Adjustment Mode (05)>

Original mode
Color Printe Red Item to be
Text/ Custo Remarks
mode d Seal adjusted
Photo Text Photo Map m
Image Color
(*1) Mode
(*2) Mode
Full color 7713 7714 7715 7716 7717 7718 7719 Manual density The larger the
mode center value is, the darker
value the image
7720 7721 7722 7723 7724 7725 7726 Automatic becomes.
density Acceptable values:
0 to 255 (Default:
Twin 7733 7734 7735 - - - - Manual density 128)
color mode center 6
value
7736 7737 7738 - - - - Automatic
density
Mono 7727 7728 7729 - - - - Manual density
color mode center
value
7730 7731 7732 - - - - Automatic
density

<Adjustment Mode (05)>

Original mode
Color Item to be
Text/ Gray Custom Remarks
mode Text Photo adjusted
Photo scale Mode
Black 7114 7115 7116 7138 7134 Manual The larger the value is, the
density mode darker the image becomes.
center value Acceptable values:
7123 7124 7125 7141 7137 Automatic 0 to 255 (Default: 128)
density mode
Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustments according to the following procedure.
Notes:
Be sure that this adjustment is made after performing P. 6-27 "6.2.1 Automatic gamma
adjustment".
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in a code and press the [START] button.
(3) Key in an adjustment value.
(To correct the value once keyed in, press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value. o The equipment goes back to the
ready state.
(5) Press the [FAX] button and then press the [START] button to make a test copy.
(6) If the desired image quality has not been attained, repeat step (2) to (5).

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SETTING / ADJUSTMENT
6 - 29
6.2.3 Color balance adjustment
The color balance is adjusted by adjusting the density of each color at the Full Color Mode. The
adjustment is performed by selecting its density area from the following: low density, medium density
and high density.

<Adjustment Mode (05)>

Original mode
Item to
Color Red be Remarks
Text/ Printed Custom
Text Photo Map Seal adjusted
Photo Image mode
Color
Yellow 7960-0 7961-0 7962-0 7963-0 7964-0 7980-0 7984-0 Low The larger
density the value
7960-1 7961-1 7962-1 7963-1 7964-1 7980-1 7984-1 Medium is, the
density darker the
color to
7960-2 7961-2 7962-2 7963-2 7964-2 7980-2 7984-2 High
be
density
adjusted
Mage 7965-0 7966-0 7967-0 7968-0 7969-0 7981-0 7985-0 Low becomes.
nta density Acceptabl
7965-1 7966-1 7967-1 7968-1 7969-1 7981-1 7985-1 Medium e values:
density 0 to 255
7965-2 7966-2 7967-2 7968-2 7969-2 7981-2 7985-2 High (Default:
density 128)
Cyan 7970-0 7971-0 7972-0 7973-0 7974-0 7982-0 7986-0 Low
density
7970-1 7971-1 7972-1 7973-1 7974-1 7982-1 7986-1 Medium
density
7970-2 7971-2 7972-2 7973-2 7974-2 7982-2 7986-2 High
density
Black 7975-0 7976-0 7977-0 7978-0 7979-0 7983-0 7987-0 Low
density
7975-1 7976-1 7977-1 7978-1 7979-1 7983-1 7987-1 Medium
density
7975-2 7976-2 7977-2 7978-2 7979-2 7983-2 7987-2 High
density

Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustments according to the following procedure.
Notes:
Be sure that this adjustment is made after performing P. 6-27 "6.2.1 Automatic gamma
adjustment".
Changing the adjustment setting influences the adjacent density area slightly.
E.g.: When the value of the medium density is larger, the adjacent areas in the low density
and high density range will become slightly darker.
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the code of the mode to be adjusted (color and original mode) and press the [START]
button.
(3) Select the density area to be adjusted with digital keys (0, 1 or 2), and press the [START] button.
0: Low density
1: Medium density
2: High density
(4) Key in an adjustment value. (To correct the value once keyed in, press the [CLEAR] button.)
(5) Press the [OK] or [INTERRUPT] button to store the value in memory.

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SETTING / ADJUSTMENT
6 - 30
 o The equipment goes back to the ready state.
(6) For resetting the value, repeat step (2) to (5).
(7) Press the [FAX] button and then press the [START] button to make a test copy.
(8) If the desired image quality has not been attained, repeat step (2) to (7).

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SETTING / ADJUSTMENT
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<Range of the density area (low density, medium density, high density)>

The color from 10 to 30 (low density), from 40 to 70 (medium density) and from 80 to 100 (high density)
in No. TCC-1/TCC-2 chart can be used as a guide for the range of the density area influenced by the
change of the adjustment value (low density, medium density, high density).

Low density

Medium density

High density

Fig.6-21

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SETTING / ADJUSTMENT
6 - 32
6.2.4 Gamma balance adjustment
The density adjustment at the Black Mode is performed by selecting its density area from the following:
low density, medium density and high density.

<Adjustment Mode (05)>

Original mode
Color Item to be
Text/ Gray Custom Remarks
mode Text Photo adjusted
Photo scale mode
Black 7190-0 7191-0 7192-0 7956-0 7276-0 Low density The larger the value is, the
7190-1 7191-1 7192-1 7956-1 7276-1 Medium density density of the item to be
adjusted becomes darker.
7190-2 7191-2 7192-2 7956-2 7276-2 High density
Acceptable values:
0 to 255 (Default: 128)

Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustments according to the following procedure. 6
Notes:
Be sure that this adjustment is made after performing P. 6-27 "6.2.1 Automatic gamma
adjustment".

<Procedure>
The procedure is the same as that of P. 6-30 "6.2.3 Color balance adjustment".

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SETTING / ADJUSTMENT
6 - 33
6.2.5 Background adjustment
The density of the background can be adjusted as follows.

<Adjustment Mode (05)>

Original mode
Color Red
Text/ Printed Custom Gray Seal Remarks
mode Text Photo Map
Photo Image mode scale Color
Mode
Full 7656 7657 7658 7659 7660 7661 --- 7662 The larger the value is,
color the darker the
Mono 7707 7708 7709 --- --- --- --- --- background becomes.
color Acceptable values:
0 to 255 (Default: 128)
Twin 7710 7711 7712 --- --- --- --- ---
color
Black 7100 7101 --- 7102 --- 7106 7105 ---

Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustment using the following procedure.

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

6.2.6 Judgment threshold for ACS (common for copy and scan)
Judgment levels for automatically identifying whether an original is color or black are adjusted. This
adjustment is for judgment levels when “Auto Color” is selected as a color mode. The same adjustment
value is simultaneously applied to all cases of originals on the original glass for copier functions and
network scanning functions, and those placed on the RADF.

<Adjustment Mode (05)>

Item to be
Code Contents
adjusted
7630 Judgment threshold The larger the value is, the more an original tends to be judged as black even at
for ACS the Auto Color Mode. The smaller value is, the more it tends to be judged as
color.
Acceptable values: 0 to 255 (Default: 70)
Make a test copy and compare the image obtained with the current settings; if necessary and make
adjustment.

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

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SETTING / ADJUSTMENT
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6.2.7 Sharpness adjustment
If you want to make copy images look softer or sharper, perform the following adjustment.
The adjustment can be made for each of the color modes and original modes independently.

<Adjustment Mode (05)>

Code Color mode Original mode Contents

7796 Full Color Text/Photo The larger the value is, the sharper the image becomes;
7797 Text while the smaller the value is, the softer the image
becomes.
7798 Printed Image The smaller the value is, the less moire tends to appear.
7799 Photo Acceptable values: 0 to 255 (Default: 128)
7800 Map
7795 Custom mode
7794 Red Seal Color
Mode
7801 Mono color Text/Photo
6
7802 Text
7803 Printed Image
7804 Twin color Text/Photo
7805 Text
7806 Printed Image
7056 Black Text/Photo
7057 Text
7058 Photo
7249 Custom mode
7061 Gray scale

Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustment.
Notes:
You have to make adjustment by balancing between moire and sharpness.
<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

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SETTING / ADJUSTMENT
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6.2.8 Setting range correction
The values of the background peak/text peak in the range correction at the Black Mode can be
switched to “varied” or “fixed” in the following codes.
If they are fixed, the range correction is performed with standard values.
The values of the background peak affects the reproduction of the background density, and the values
of the text peak affects that of the text density.

<Adjustment Mode (05)>

Original mode Item to be

Original mode Remarks
Text/Photo Text User Custom adjusted
Black 7286 7287 7237 Manual 0: Background peak / fixed
density mode 1: Background peak / varied
Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustment.

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

6.2.9 Adjustment of smudged/faint text

The smudge/faint text at a Black Mode can be set at the following codes.

<Adjustment Mode (05)>

Original mode
Item to be
Color mode Text/ Custom Remarks
Text adjusted
Photo mode
Black 7097 7098 7252 Adjustment of When the value decreases, the
smudged/ faint faint text is improved. When the
text value increases, the smudged text
is improved.
Acceptable values: 0 to 4
(Default: 2)

Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustment.
Notes:
Remember the image specifications and life span of the replacing parts may not meet the
standard when the setting value is changed from the default value.
<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

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SETTING / ADJUSTMENT
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6.2.10 Color Adjustment of Marker
The color of the one touch adjustment “MARKER” can be adjusted so that any marker colors already on
the original can be distinguished.

<Adjustment Mode (05)>

Relation between the adjustment value and the color

Item to be (Acceptable values: 0 to 6)
Code
adjusted
0 to 2 3 (Default) 4 to 6
7850-0 Yellow The smaller the value Yellow The larger the value
is, the more reddish is, the more greenish
the color becomes. the color becomes.
7850-1 Magenta The smaller the value Magenta The larger the value
is, the more bluish the is, the more reddish
color becomes. the color becomes.
7850-2 Cyan The smaller the value Cyan The larger the value
is, the more greenish is, the more bluish the 6
the color becomes. color becomes.
7850-3 Red The smaller the value Red The larger the value
is, the closer to is, the more yellowish
Magenta the color the color becomes.
becomes.
7850-4 Green The smaller the value Green The larger the value
is, the more yellowish is, the closer to Cyan
the color becomes. the color becomes.
7850-5 Blue The smaller the value Blue The larger the value
is, the closer to Cyan is, the closer to
the color becomes. Magenta the color
becomes.
Notes:
The color may not always be reproduced precisely due to the characteristics of the fluorescent
ink.

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in a code and press the [START] button.
(3) Key in a sub-code and press the [START] button.
(4) Key in an adjustment value.
(To correct a value once keyed in, press the [CLEAR] button.)
(5) Press the [OK] or [INTERRUPT] button to store the value. o The equipment goes back to the
ready state.
(6) Turn the power OFF and back ON in the normal mode. Then make a copy in the one touch
adjustment “MARKER” mode.
(7) If the desired image quality has not been attained, repeat step (1) to (6).

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SETTING / ADJUSTMENT
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6.2.11 LED emission level adjustment
The LED emission level in the black mode can be adjusted as follows. This adjustment adjusts the dot
size.

<Adjustment Mode (05)>

Code Item to be adjusted Remarks

7212-0 LED emission level 0/4 The smaller the value is, the smaller the LED
7212-1 LED emission level 1/4 emission level becomes. Therefore, the smaller dot is
reproduced accordingly. Acceptable values: 0 to 255
7212-2 LED emission level 2/4 (Default: Level 0/4: 0, Level 1/4: 63, Level 2/4: 127,
7212-3 LED emission level 3/4 Level 3/4: 191, Level 4/4: 240)
7212-4 LED emission level 4/4

Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustments according to the following procedure.

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in a code and press the [START] button.
(3) Key in a sub-code and press the [START] button.
(4) Key in an adjustment value.
(To correct a value once keyed in, press the [CLEAR] button.)
(5) Press the [OK] or [INTERRUPT] button to store the value. o The equipment goes back to the
ready state.
(6) Press the [FAX] button and then press the [START] button to make a test copy.
(7) If the desired image quality has not been attained, repeat step (2) to (6).

Notes:
• The setting value must increase as the LED emission level number (0 to 4) becomes higher. Do
not increase this order when setting the values.
• Usually, LED emission level 4 / 4 is most effective in the black mode.

6.2.12 Maximum toner density adjustment to paper type

The maximum toner adhesion amount can be adjusted for each paper type.
It is used when offsetting occurs.

<Adjustment Mode (05)>

Code Paper type Remarks

7913-0 Plain paper The smaller the value is, the toner amount adhered
7913-2 Recycled paper decreases of the high density area (ex. prevention of
fusing offsetting, etc.).
7913-3 Thick paper 1 Acceptable values: 0 to 255
7913-4 Thick paper 2 (Default: 128)
7913-7 Special paper 1
7913-8 Special paper 2
7913-11 Envelop
7913-12 OHP film
Notes:
Even if a large value is set, the image does not drastically appear dark (the amount of toner
adhering is not increased).

<Procedure>

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SETTING / ADJUSTMENT
6 - 38
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

6.2.13 Maximum text density adjustment

The maximum text density in each color in the full color mode (Text/Photo, Text, Map mode) can be
adjusted.

<Adjustment Mode (05)>

Color Code Item to be adjusted Remarks

Yellow 7889 Maximum text density The larger the value is, the darker the maximum
Magenta 7890 text density of each color to be adjusted
Cyan 7891 becomes.
Acceptable values: 0 to 10 (Default: 5)
Black 7892

Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustments according to the following procedure. 6
Notes:
Be sure that this adjustment is made after performing P. 6-27 "6.2.1 Automatic gamma
adjustment".

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

6.2.14 Text/Photo reproduction level adjustment

Text/Photo reproduction level at the Full color mode and Auto color mode can be adjusted.
Text/Photo reproduction level adjustment can be switched to “Photo oriented 1”, “Photo oriented 2”,
“Text oriented 1” or “Text oriented 2” in the following codes.

<Adjustment Mode (05)>

Mode
Custom Item to be
Red Seal Contents
Text/ mode adjusted
Color
Photo (Text/Photo Mode
base)
7840 7841 7842 Text/Photo 0, 5: Default
reproduction level The smaller the value, the higher the
adjustment printed image reproduction level becomes
(Photo oriented). The larger the value, the
higher the text reproduction level becomes
(Text oriented).
Notes:
• The text reproduction level is lower when the mode is switched from the default value to the
Photo oriented.
• When you change the setting from the default value to Text oriented, noise occurs in a printed
photo with a few lines.
• The codes for the user custom setting are enabled only when the base original mode of the
user custom mode is Text/Photo.

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

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SETTING / ADJUSTMENT
6 - 39
6.2.15 Black header density level adjustment
The density level of headers in the black mode is adjusted.

<Adjustment Mode (05)>

Mode Code Original mode Remarks

Full Color 7811 Text/Photo The larger the value is, the darker the headers
7812 Text become. However, the density level differs depending
on the modes.
7816 Custom mode
Acceptable values: 0 to 8 (Default: 0)
7817 Red Seal Color If the value is set to "0", the table specified by default
Mode is used. The default tables are as follows:
• Text/Photo mode: 4
• Text mode: 4
• User custom setting
(in the Text/Photo, Map, or Text mode base): 4
• User custom setting
(in the Photo or Printed image mode base): 3
Make a test copy and compare the image obtained with the current settings; if necessary, make
adjustment.

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

6.2.16 Black area adjustment in twin color copy mode

<Adjustment Mode (05)>

Item to be
Mode Code Remarks
adjusted
Twin color mode 7641-0 High density The larger the value is, the larger the area
with selected 7641-1 Medium density recognized as black in the original becomes. The
colors smaller the value is, the larger the area recognized
7641-2 Low density
as the color other than black becomes.
Acceptable values: 0 to 255 (Default: 128)
Twin color mode 7642-0 High density The larger the value is, the larger the black area
(Black and red) 7642-1 Medium density becomes. The smaller the value is, the larger the
red area becomes.
7642-2 Low density
Acceptable values: 0 to 255 (Default: 128)

<Procedure>
The procedure is the same as that of P. 6-30 "6.2.3 Color balance adjustment".

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SETTING / ADJUSTMENT
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6.2.17 Judgment threshold adjustment for blank originals (common for
copy and scan)
The judgment level is adjusted for automatic identification of whether the original set is blank or not.
This adjustment is made when “OMIT BLANK PAGE” is selected on the control panel.
The adjustment value is simultaneously applied to all modes at PPC and scanning.

<Adjustment Mode (05)>

Code Item to be adjusted Remarks

7618 Judgment threshold The larger the value is, the more an original tends to be
adjustment for blank judged as a bank sheet.
original Acceptable values: 0 to 255 (Default: 128)

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".
6
6.2.18 Background offsetting adjustment for RADF (common for copy,
scan and fax)
The background level for scanning originals with the RADF is adjusted when the background fogging at
the scanning of a manually-set original and an original used with the RADF is different. This is to adjust
the level of the background image removed when the scanning of the originals with the RADF is
performed.

<Adjustment Mode (05)>

Color mode Code Remarks

Color 7026 The larger the value is, the darker the background density
Black 7025 becomes.
Acceptable values: 0 to 255
(Default: 128)

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

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SETTING / ADJUSTMENT
6 - 41
6.2.19 Twin color copy / mono color copy adjustment
The density of the color specified on the touch panel is adjusted in the monocolor copy or twin color
copy mode. This adjustment is reflected to both monocolor and twin color copying.

<Adjustment Mode (05)>

Subcode
Code Remarks
Y M C K
Magenta 7644-0 7644-1 7644-2 7644-3 The larger the value is, the darker the density
Yellow 7645-0 7645-1 7645-2 7645-3 becomes, and the smaller the value is, the
lighter the density becomes. When "255" is
YellowGreen 7646-0 7646-1 7646-2 7646-3
set, the specified solid color is used for
Cyan 7647-0 7647-1 7647-2 7647-3 printing. When "0" is set, nothing is printed.
Pink 7648-0 7648-1 7648-2 7648-3 For example, in case of "Red", the color when
Red 7649-0 7649-1 7649-2 7649-3 "Red" is specified becomes blue if you set as
Orange 7650-0 7650-1 7650-2 7650-3 follows:
(Y) 7649-0=0
Green 7651-0 7651-1 7651-2 7651-3
(M) 7649-1=128
Blue 7652-0 7652-1 7652-2 7652-3 (C) 7649-2=255
Purple 7653-0 7653-1 7653-2 7653-3 Acceptable value: 0 to 255 (Default: 128)
Notes:
• If a large value is set for all of YMCK,
offsetting may occur. Make an
adjustment while checking the
image.
• If "0" is set for all four colors of
YMCK, when a color is specified for
the adjustment item, nothing is
printed.

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the code of the mode to be adjusted (color and original mode) and press the [START]
button.
(3) Select the density area to be adjusted with digital keys (0, 1, 2 or 3), and press the [START]
button.
0: Y
1: M
2: C
3: K
(4) Key in an adjustment value. (To correct the value once keyed in, press the [CLEAR] button.)
(5) Press the [OK] or [INTERRUPT] button to store the value in memory.
o The equipment goes back to the ready state.
(6) For resetting the value, repeat step (2) to (5).
(7) Turn ON the power of the equipment and make a copy.
(8) If the desired image quality has not been attained, repeat step (1) to (7).

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SETTING / ADJUSTMENT
6 - 42
6.2.20 Maximum density adjustment for each paper type
The maximum density for each paper type can be adjusted collectively.

<Adjustment Mode (05)>

Code Paper type Remarks

7902 Plain paper The smaller the value is, the lower the density of the
7904 Recycled paper whole image becomes.
Acceptable values: 0 to 255
7905 Thick paper 1 (Default: Plain paper: 255, Recycled paper: 255,
7906 Thick paper 2 Thick paper 1: 255, Thick paper 2: 255, Special paper
1: 255, Special paper 2: 255, Envelope: 255, OHP
7909 Special paper 1
film: 240)
7910 Special paper 2
7901 Envelope
7911 OHP film
Notes: 6
Be aware that if too small a value is set, a faint image occurs.

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

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SETTING / ADJUSTMENT
6 - 43
6.2.21 Color reproduction selection
When the custom mode or red seal color mode is selected, the color reproduction can be adjusted as
follows.

<Adjustment Mode (05)>

Code Original mode Item to be adjusted Remarks

7690 Custom mode Color reproduction 0: Text/Photo, printed image, text, map
adjustment 1: Photo
7691 Red seal color mode
2: Red seal color mode
3: Text/Photo, printed image, text, map
4: Text/Photo, printed image, text, map
<Default value>
Custom mode: 0
Red seal color mode: 2

Notes:
Be sure that this adjustment is made after performing P. 6-27 "6.2.1 Automatic gamma
adjustment".

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in a code and press the [START] button.
(3) Key in an adjustment value.
(To correct a value once keyed in, press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value. o The equipment goes back to the
ready state.
(5) Press the [FAX] button and then press the [START] button to make a test copy.
(6) If the desired image quality has not been attained, repeat step (2) to (5).

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SETTING / ADJUSTMENT
6 - 44
6.2.22 Hue adjustment
The hue in the full color mode can be adjusted as follows.

<Adjustment Mode (05)>

Item to be
Code Original mode Description Remarks
adjusted
7665-0 Text/Photo Red The larger the value, the darker the Acceptable value: 0 to
yellow becomes. The smaller the value, 255
the darker the magenta becomes. Default value: 128
7665-1 Text/Photo Yellow The larger the value, the darker the
green becomes. The smaller the value,
the darker the red becomes.
7665-2 Text/Photo Green The larger the value, the darker the
cyan becomes. The smaller the value,
the darker the yellow becomes.
7665-3 Text/Photo Cyan The larger the value, the darker the blue
becomes. The smaller the value, the 6
darker the green becomes.
7665-4 Text/Photo Blue The larger the value, the darker the
magenta becomes. The smaller the
value, the darker the cyan becomes.
7665-5 Text/Photo Magenta The larger the value, the darker the red
becomes. The smaller the value, the
darker the blue becomes.
7666-0 Text Red The larger the value, the darker the
yellow becomes. The smaller the value,
the darker the magenta becomes.
7666-1 Text Yellow The larger the value, the darker the
green becomes. The smaller the value,
the darker the red becomes.
7666-2 Text Green The larger the value, the darker the
cyan becomes. The smaller the value,
the darker the yellow becomes.
7666-3 Text Cyan The larger the value, the darker the blue
becomes. The smaller the value, the
darker the green becomes.
7666-4 Text Blue The larger the value, the darker the
magenta becomes. The smaller the
value, the darker the cyan becomes.
7666-5 Text Magenta The larger the value, the darker the red
becomes. The smaller the value, the
darker the blue becomes.
7667-0 Printed image Red The larger the value, the darker the
yellow becomes. The smaller the value,
the darker the magenta becomes.
7667-1 Printed image Yellow The larger the value, the darker the
green becomes. The smaller the value,
the darker the red becomes.
7667-2 Printed image Green The larger the value, the darker the
cyan becomes. The smaller the value,
the darker the yellow becomes.
7667-3 Printed image Cyan The larger the value, the darker the blue
becomes. The smaller the value, the
darker the green becomes.
7667-4 Printed image Blue The larger the value, the darker the
magenta becomes. The smaller the
value, the darker the cyan becomes.
7667-5 Printed image Magenta The larger the value, the darker the red
becomes. The smaller the value, the
darker the blue becomes.

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SETTING / ADJUSTMENT
6 - 45
 Item to be
Code Original mode Description Remarks
adjusted
7668-0 Photo Red The larger the value, the darker the Acceptable value: 0 to
yellow becomes. The smaller the value, 255
the darker the magenta becomes. Default value: 128
7668-1 Photo Yellow The larger the value, the darker the
green becomes. The smaller the value,
the darker the red becomes.
7668-2 Photo Green The larger the value, the darker the
cyan becomes. The smaller the value,
the darker the yellow becomes.
7668-3 Photo Cyan The larger the value, the darker the blue
becomes. The smaller the value, the
darker the green becomes.
7668-4 Photo Blue The larger the value, the darker the
magenta becomes. The smaller the
value, the darker the cyan becomes.
7668-5 Photo Magenta The larger the value, the darker the red
becomes. The smaller the value, the
darker the blue becomes.
7669-0 Map Red The larger the value, the darker the
yellow becomes. The smaller the value,
the darker the magenta becomes.
7669-1 Map Yellow The larger the value, the darker the
green becomes. The smaller the value,
the darker the red becomes.
7669-2 Map Green The larger the value, the darker the
cyan becomes. The smaller the value,
the darker the yellow becomes.
7669-3 Map Cyan The larger the value, the darker the blue
becomes. The smaller the value, the
darker the green becomes.
7669-4 Map Blue The larger the value, the darker the
magenta becomes. The smaller the
value, the darker the cyan becomes.
7669-5 Map Magenta The larger the value, the darker the red
becomes. The smaller the value, the
darker the blue becomes.
7670-0 Custom Red The larger the value, the darker the
yellow becomes. The smaller the value,
the darker the magenta becomes.
7670-1 Custom Yellow The larger the value, the darker the
green becomes. The smaller the value,
the darker the red becomes.
7670-2 Custom Green The larger the value, the darker the
cyan becomes. The smaller the value,
the darker the yellow becomes.
7670-3 Custom Cyan The larger the value, the darker the blue
becomes. The smaller the value, the
darker the green becomes.
7670-4 Custom Blue The larger the value, the darker the
magenta becomes. The smaller the
value, the darker the cyan becomes.
7670-5 Custom Magenta The larger the value, the darker the red
becomes. The smaller the value, the
darker the blue becomes.
7671-0 Red seal color Red The larger the value, the darker the
yellow becomes. The smaller the value,
the darker the magenta becomes.
7671-1 Red seal color Yellow The larger the value, the darker the
green becomes. The smaller the value,
the darker the red becomes.

e-STUDIO2050C/2051C/2550C/2551C © 2012-2015 TOSHIBA TEC CORPORATION All rights reserved

SETTING / ADJUSTMENT
6 - 46
 Item to be
Code Original mode Description Remarks
adjusted
7671-2 Red seal color Green The larger the value, the darker the Acceptable value: 0 to
cyan becomes. The smaller the value, 255
the darker the yellow becomes. Default value: 128
7671-3 Red seal color Cyan The larger the value, the darker the blue
becomes. The smaller the value, the
darker the green becomes.
7671-4 Red seal color Blue The larger the value, the darker the
magenta becomes. The smaller the
value, the darker the cyan becomes.
7671-5 Red seal color Magenta The larger the value, the darker the red
becomes. The smaller the value, the
darker the blue becomes.

Notes:
Be sure that this adjustment is made after performing P. 6-27 "6.2.1 Automatic gamma
adjustment". 6

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in a code and press the [START] button. (e.g. 7665)
(3) Key in a value to adjust the color.
0: Red
1: Yellow
2: Green
3: Cyan
4: Blue
5: Magenta
(To correct a value once keyed in, press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value. o The equipment goes back to the
ready state.
(5) Repeat step (2) to (4) to make the setting again.
(6) Press the [FAX] button and then press the [START] button to make a test copy.
(7) If the desired image quality has not been attained, repeat step (2) to (6).

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SETTING / ADJUSTMENT
6 - 47
6.2.23 Saturation adjustment
The saturation of the copied image in the color copying function can be adjusted as follows.

<Adjustment Mode (05)>

Item to be
Code Original mode Description Remarks
adjusted
7675-0 Text/Photo Red Input the larger value to increase the Acceptable value: 0 to
7675-1 Text/Photo Yellow saturation, and input the smaller value 255
to decrease the saturation. Default value: 128
7675-2 Text/Photo Green
7675-3 Text/Photo Cyan
7675-4 Text/Photo Blue
7675-5 Text/Photo Magenta
7676-0 Text Red
7676-1 Text Yellow
7676-2 Text Green
7676-3 Text Cyan
7676-4 Text Blue
7676-5 Text Magenta
7677-0 Printed image Red
7677-1 Printed image Yellow
7677-2 Printed image Green
7677-3 Printed image Cyan
7677-4 Printed image Blue
7677-5 Printed image Magenta
7678-0 Photo Red
7678-1 Photo Yellow
7678-2 Photo Green
7678-3 Photo Cyan
7678-4 Photo Blue
7678-5 Photo Magenta
7679-0 Map Red
7679-1 Map Yellow
7679-2 Map Green
7679-3 Map Cyan
7679-4 Map Blue
7679-5 Map Magenta
7680-0 Custom Red
7680-1 Custom Yellow
7680-2 Custom Green
7680-3 Custom Cyan
7680-4 Custom Blue
7680-5 Custom Magenta
7681-0 Red seal color Red
7681-1 Red seal color Yellow
7681-2 Red seal color Green
7681-3 Red seal color Cyan
7681-4 Red seal color Blue
7681-5 Red seal color Magenta

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SETTING / ADJUSTMENT
6 - 48
 Notes:
Be sure that this adjustment is made after performing P. 6-27 "6.2.1 Automatic gamma
adjustment".

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in a code and press the [START] button. (e.g. 7675)
(3) Key in a value to adjust the color.
0: Red
1: Yellow
2: Green
3: Cyan
4: Blue
5: Magenta
(To correct a value once keyed in, press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value. o The equipment goes back to the
ready state.
(5) Repeat step (2) to (4) to make the setting again. 6
(6) Press the [FAX] button and then press the [START] button to make a test copy.
(7) If the desired image quality has not been attained, repeat step (2) to (6).

6.2.24 ADF noise reduction (Copying Function)

The noise reduction level for streaks can be adjusted with the following codes when a copy job whose
color mode is [BLACK] is performed using the ADF while its scan noise reduction function is set to
enable (*).
* When [LOW], [MIDDLE] or [HIGH] is selected in the [ADMIN] tab of the [USER FUNCTIONS] menu,
or when "0", "1" or "2" is selected in 08-7617.
<Adjustment Mode (05)>

Original mode
Item to be
Color mode Text/ Custom Remarks
Text adjusted
Photo mode
Black 7151 7152 7150 ADF noise When the value decreases, the effect of reducing
reduction streaks (set with 08-7617) becomes larger. When
the value increases, the effect of reducing streaks
(set with 08-7617) becomes smaller.
When "0" is set, this function is disabled.
Acceptable values: 0 to 200
(Default: 100)

When [FULL COLOR] or [AUTO COLOR] is selected for the color mode, the ADF noise reduction
function for streaks can be set to enable or disable with the following codes.

Original mode
Item to be
Color mode Text/ Custom Remarks
Text adjusted
Photo mode
Color 7694 - 7693 ADF noise Enable/Disable setting
reduction 0: Disabled 1: Enabled
(Default: 1)
05-7693 is available only when "1" (TEXT/PHOTO
base" is set for 08-7614.
Notes:
• Remember the image specifications and life span of the replacing parts may not meet the
standard when the setting value is changed from the default value.
• If too small a value is set, the text may not be printed clearly.

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".
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SETTING / ADJUSTMENT
6 - 49
6.3 Image Quality Adjustment (Printing Function)

6.3.1 Automatic gamma adjustment

When the reproduction of gradation is not appropriate, the gradation reproducibility of all colors Y, M, C
and K can be corrected by performing this automatic gamma adjustment. In case the gradation
reproduction of the image checked is not satisfactory, make this adjustment as described below at parts
replacement.

1. When unpacking or any of the following parts has been replaced, be sure to make this adjustment:
- Photoconductive drum
- Developer material
- LED printer head
- LED gap spacer
- Transfer belt
- 1st transfer roller
- Drum cleaning blade
- Needle electrode
- Main charger grid
- Image position aligning sensor (Front)
- Image position aligning sensor (Rear)/Image quality sensor
- SRAM board (SYS board)
- EEPROM (LGC board)
- HDD

2. When any of the following parts are replaced or adjusted, make a print and check the image to
determine if adjustment is necessary:
• 2nd transfer roller
• Screen switchover (for color: 08-8110, for black: 08-7310)
P. 6-61 "6.3.13 Sharpness adjustment"
P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)"
Notes:
Be sure to perform this adjustment after performing P. 6-4 "6.1.3 Performing Image Quality
Control".

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SETTING / ADJUSTMENT
6 - 50
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON. o Adjustment Mode
(2) Select the A4/LT/A3/LD drawer. Key in the pattern number and press the [FAX] button to output a
“Patch chart for adjustment”.
600dpi
Pattern No. Paper type Remarks
70 Plain paper Used when the code 8004-0 is performed
74 Recycled paper Used when the code 8004-2 is performed
76 Thick paper 1 Used when the code 8004-3 is performed
78 Thick paper 2 Used when the code 8004-4 is performed
84 Special paper 1 Used when the code 8004-7 is performed
86 Special paper 2 Used when the code 8004-8 is performed
Notes:
However, this is applied to all paper types when 05-8008 is performed.

1200dpi 6
Pattern No. Paper type Remarks
230 Plain paper Used when the code 8005-0 is performed
234 Recycled paper Used when the code 8005-2 is performed
236 Thick paper 1 Used when the code 8005-3 is performed
238 Thick paper 2 Used when the code 8005-4 is performed
244 Special paper 1 Used when the code 8005-7 is performed
246 Special paper 2 Used when the code 8005-8 is performed
Notes:
However, this is applied to all paper types when 05-8009 is performed.

(3)
Place the patch chart for adjustment printed in step (2) face down on the original glass, with its
side, on which two black squares are present, aligned against the original scale.
(4) Key in a code and press the [START] button. o The scanner reads the chart automatically and
performs automatic gamma adjustment calculation (approx. 30 sec.).
600dpi
Code Paper type Remarks
8004-0 Plain paper When the reproduction of gradation is not
8004-2 Recycled paper appropriate, the gradation reproducibility of all colors
8004-3 Thick paper 1 Y, M, C and K can be corrected by performing this
automatic gamma adjustment.
8004-4 Thick paper 2
8004-7 Special paper 1
8004-8 Special paper 2
8008 All paper types
* If the code 8008 is performed, the adjustment will be applied to all paper types.
1200dpi
Code Paper type Remarks
8005-0 Plain paper When the reproduction of gradation is not
8005-2 Recycled paper appropriate, the gradation reproducibility of all colors
Y, M, C and K can be corrected by performing this
8005-3 Thick paper 1
automatic gamma adjustment.
8005-4 Thick paper 2
8005-7 Special paper 1
8005-8 Special paper 2
8009 All paper types
* If the code 8009 is performed, the adjustment will be applied to all paper types.
* 05-8005 and 8009 are not supported by LL20/25ppm model.
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SETTING / ADJUSTMENT
6 - 51
 (5) When the adjustment has finished normally, press the [OK] button to have the adjustment results
reflected.
(To cancel the reflection of adjustment results, press the [CANCEL] button.)
In the case of an abnormal ending, “ADJUSTMENT ERROR” is shown. Press the [CANCEL]
button to clear the error display.
When it is cleared, the control panel display will return to the ready state. Then, check if the patch
chart on the original glass is placed in the wrong direction or if it is placed inclined on the original
glass, and then repeat step (3) and afterward.

To select the paper type for the automatic gamma adjustment in user calibration, change the code
below to "1". (copy/print)

Code Remarks
08-9059 0: No paper selecting buttons displayed
1: Paper selecting buttons displayed. (For both Copy and Printer)

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SETTING / ADJUSTMENT
6 - 52
6.3.2 Gamma balance adjustment (Black Mode)
The gamma balance is adjusted by adjusting the density at the Black Mode. The adjustment is
performed by selecting its density area from the following: low density, medium density, and high
density.
When "Black" (600 dpi) is set for the color mode and "Auto" is selected for the halftone setting, the
gamma balance can be adjusted in each area of Text, Graphics and Image.
Notes:
PS, XPS, and 1200dpi are not supported by LL20/25ppm model.

<Adjustment Mode (05)>

Color Smooth Detail Smooth Detail Smooth Detail

Remarks
mode (PS) (PS) (PCL) (PCL) (XPS) (XPS)
Black 7315-0 7316-0 7317-0 7318-0 7319-0 7320-0 The larger the value is, the
(600dpi) 7315-1 7316-1 7317-1 7318-1 7319-1 7320-1 density of the item to be
adjusted becomes darker.
7315-2 7316-2 7317-2 7318-2 7319-2 7320-2
Acceptable values: 0 to 255
6
(Default: 128)
Black 7309-0 7310-0 --- --- --- --- The larger the value is, the
(1200dp 7309-1 7310-1 --- --- --- --- density of the item to be
i) 7309-2 7310-2 --- --- --- --- adjusted becomes darker.
Acceptable values: 0 to 255
(Default: 128)

Auto (PS) Auto (PCL)

Color Smoot Smoot Smoot
Detail Detail Detail Remarks
mode h h h
(PS) (PCL) (XPS)
(PS) (PCL) (XPS)
Black 7360-0 7361-0 7362-0 7363-0 7364-0 7365-0 The larger the value is, the
(600dpi) 7360-1 7361-1 7362-1 7363-1 7364-1 7365-1 density of the item to be adjusted
becomes darker.
7360-2 7361-2 7362-2 7363-2 7364-2 7365-2
Acceptable values: 0 to 255
(Default: 128)

Auto (XPS)
Color Smoot
Smooth Detail Remarks
mode h
(PS) (PS)
(PCL)
Black 7366-0 7367-0 7368-0 The larger the value is, the density of the item to be
(600dpi) 7366-1 7367-1 7368-1 adjusted becomes darker.
Acceptable values: 0 to 255
7366-2 7367-2 7368-2
(Default: 128)
Notes:
• Be sure that this adjustment be made after performing P. 6-50 "6.3.1 Automatic gamma
adjustment".
• Changing the adjustment setting influences the adjacent density area slightly.
E.g.: When the value of the medium density is larger, the adjacent areas in the low density and
high density range will become slightly darker.
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the codes to be adjusted (language and screen) and press the [START] button.
(3) Key in the value corresponding to the density area to be adjusted (0, 1 or 2) and press the
[START] button.
0: Low density 1: Medium density 2: High density/Highest density

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SETTING / ADJUSTMENT
6 - 53
 (4) Key in the adjustment value. (To correct the value once keyed in, press the [CLEAR] button.)
(5) Press the [OK] or [INTERRUPT] button to store the value in memory. o The equipment goes
back to the ready state.
(6) For resetting the value, repeat step (2) to (5).
(7) Let the equipment restart and perform the printing job.
(8) If the image density has not been attained, repeat step (1) to (7)

<Range of the density area (low density, medium density, high density)>
The color from the 1st to the 7th stage (low density), from the 8th to the 11th stage (medium density)
and from the 12th to the 13th stage (high density) in "Patch chart for gamma adjustment ([71] [FAX])"
output as a confirmation in P. 6-50 "6.3.1 Automatic gamma adjustment" can be used as a guide for
the range of the density area (low density, medium density, high density) influenced by the change of
the adjustment value.

1
2
3
Low 4
density 5
6
7
8
Medium 9
density 10
11
12
High density
13

Fig.6-22

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SETTING / ADJUSTMENT
6 - 54
6.3.3 Color balance adjustment
The color balance is adjusted by adjusting the density of each color. The adjustment is performed by
selecting its density area from the following: low density, medium density, and high density.
Notes:
PS, XPS, and 1200dpi are not supported by LL20/25ppm model.

<Adjustment Mode (05)>

For color printing

PS PCL XPS
Color Remarks
Smooth Detail Smooth Detail Smooth Detail
Yellow 8050-0 8054-0 8058-0 8062-0 8042-0 8046-0 The larger the value is, the darker
(600dpi) 8050-1 8054-1 8058-1 8062-1 8042-1 8046-1 the color to be adjusted becomes.
Acceptable
8050-2 8054-2 8058-2 8062-2 8042-2 8046-2
values: 0 to 255
Magenta 8051-0 8055-0 8059-0 8063-0 8043-0 8047-0 (Default: 128)
(600dpi) 8051-1 8055-1 8059-1 8063-1 8043-1 8047-1 6
8051-2 8055-2 8059-2 8063-2 8043-2 8047-2
Cyan 8052-0 8056-0 8060-0 8064-0 8044-0 8048-0
(600dpi) 8052-1 8056-1 8060-1 8064-1 8044-1 8048-1
8052-2 8056-2 8060-2 8064-2 8044-2 8048-2
Black 8053-0 8057-0 8061-0 8065-0 8045-0 8049-0
(600dpi) 8053-1 8057-1 8061-1 8065-1 8045-1 8049-1
8053-2 8057-2 8061-2 8065-2 8045-2 8049-2
Yellow 8268-0 8272-0 --- --- --- ---
(1200dpi) 8268-1 8272-1 --- --- --- ---
8268-2 8272-2 --- --- --- ---
Magenta 8269-0 8273-0 --- --- --- ---
(1200dpi) 8269-1 8273-1 --- --- --- ---
8269-2 8273-2 --- --- --- ---
Cyan 8270-0 8274-0 --- --- --- ---
(1200dpi) 8270-1 8274-1 --- --- --- ---
8270-2 8274-2 --- --- --- ---
Black 8271-0 8275-0 --- --- --- ---
(1200dpi) 8271-1 8275-1 --- --- --- ---
8271-2 8275-2 --- --- --- ---

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SETTING / ADJUSTMENT
6 - 55
Twin color print

Color specified Item to be adjusted

for twin color Remarks
print Black Yellow Magenta Cyan
Black 8023-0 - - - The larger the value is, the
8023-1 - - - darker the color to be adjusted
becomes.
8023-2 - - - Acceptable values: 0 to 255
Cyan - 8024-0 8025-0 8026-0 (Default: 128)
- 8024-1 8025-1 8026-1
- 8024-2 8025-2 8026-2
Magenta - 8027-0 8028-0 8029-0
- 8027-1 8028-1 8029-1
- 8027-2 8028-2 8029-2
Yellow - 8030-0 8031-0 8032-0
- 8030-1 8031-1 8032-1
- 8030-2 8031-2 8032-2
Red - 8033-0 8034-0 8035-0
- 8033-1 8034-1 8035-1
- 8033-2 8034-2 8035-2
Green - 8036-0 8037-0 8038-0
- 8036-1 8037-1 8038-1
- 8036-2 8037-2 8038-2
Blue - 8039-0 8040-0 8041-0
- 8039-1 8040-1 8041-1
- 8039-2 8040-2 8041-2
Notes:
• Be sure that this adjustment be made after performing P. 6-50 "6.3.1 Automatic gamma
adjustment".
• Changing the adjustment setting influences the adjacent density area slightly.
E.g.: When the value of the medium density is larger, the adjacent areas in the low density and
high density range will become slightly darker.

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".

<Range of the density area (low density, medium density, high density)>
The color from the 1st to the 7th stage (low density), from the 8th to the 11th stage (medium density),
from the 12th to the 13th stage (high density) in “Patch chart for gamma adjustment ([71] [FAX])” output
in P. 6-50 "6.3.1 Automatic gamma adjustment" can be used as a guide for the range of the density
area influenced by the adjustment with the printer driver and the change of the adjustment value (low
density, medium density, and high density (Refer to P. 6-54 "Fig.6-22 ").

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SETTING / ADJUSTMENT
6 - 56
6.3.4 Adjustment of faint text
The faint text can be improved in the following codes.
Notes:
PS and XPS are not supported by LL20/25ppm model.

<Adjustment Mode (05)>

Black mode Color mode

Remarks
PS PCL XPS PS PCL XPS
7340 7341 7342 8130 8131 8132 When the small characters or fine lines in a
halftone image are faint, they can be improved
by increasing the value to raise the density level.
Acceptable values: 0 to 8 (Default: 0)

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON. 6
(2) Key in the codes to be adjusted and press the [START] button.
(3) Key in the adjustment value. (To correct the value once keyed in, press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value in memory. o The equipment goes
back to the ready state.
(5) For resetting the value, repeat step (2) to (4).
(6) Let the equipment restart and perform the printing job.
(7) If the desired image has not been attained, repeat step (1) to (6).

6.3.5 Upper limit value in the Toner Saving Mode

The upper limit value of the density when "Toner save" is selected in the Custom tab of the printer driver
can be adjusted.
Notes:
PS, XPS, and 1200dpi are not supported by LL20/25ppm model.

<Adjustment Mode (05)>

Color PS PCL XPS 1200dpi Remarks

Black mode 7307-0 7307-1 7307-2 7302 The smaller the value is, the lighter
Color mode 8160-0 8160-1 8160-2 8161 the density of image becomes.
Acceptable values: 0 to 255
(Default: 176)

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".

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SETTING / ADJUSTMENT
6 - 57
6.3.6 Maximum toner density adjustment (OHP)
The maximum toner amount adhering to the paper can be controlled.
Notes:
1200dpi is not supported by LL20/25ppm model.

<Adjustment Mode (05)>

Color Code Paper type Remarks

Color (600dpi) 8145 OHP film The smaller the value is, the toner amount adhered
Color (1200dpi) 8149 decreases of the high density area (ex. prevention of
fusing offsetting, etc.).
Acceptable values: 0 to 255
(Default: 200)
<Procedure>
The procedure is the same as that of P. 6-57 "6.3.4 Adjustment of faint text".
Notes:
The larger the value is, the more frequently fusing offsetting occurs.

6.3.7 Fine line enhancement switchover

The setting of the thin line enhancement is changed.
Notes:
PS and XPS are not supported by LL20/25ppm model.

<Adjustment Mode (05)>

Black mode Color mode

Remarks
PS PCL XPS PS PCL
7322-0 7322-1 7322-2 8102-0 8102-1 8102-2 Whether fine lines are enhanced or not
can be switched.
0: OFF
1: ON
Acceptable values: 0 to 1 (Default: 1)

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".

6.3.8 “PureBlack/PureGray” threshold adjustment (PCL)

<Adjustment Mode (05)>

Original mode
Item to be
Photographi Remarks
General Presentation Line art adjusted
c
8210-0 8210-1 8210-2 8210-3 Text The larger the value is, the
8211-0 8211-1 8211-2 8211-3 Graphics wider the color range to be
printed only with the black
8212-0 8212-1 8212-2 8212-3 Image
toner becomes. The
smaller the value is, the
narrower this color range
becomes. Acceptable
values: 1 to 255

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".
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SETTING / ADJUSTMENT
6 - 58
6.3.9 “PureBlack/PureGray” threshold adjustment (Twin color mode)
<Adjustment Mode (05)>

Item to be
Code Remarks
adjusted
8213 Text The larger the value is, the wider the color range to be printed only
8214 Graphics with the black toner becomes. The smaller the value is, the narrower
this color range becomes.
8215 Image
Acceptable values: 1 to 255

<Procedure>
The procedure is the same as that of P. 6-57 "6.3.4 Adjustment of faint text".

6.3.10 “PureBlack/PureGray” threshold adjustment (PS)

Notes:
This adjustment is not supported by LL20/25ppm model. 6

<Adjustment Mode (05)>

Original mode
Item to be
Photogra Presentat Color Remarks
General Line art adjusted
phic ion profile
8252-0 8252-1 8252-2 8252-3 8252-4 Text The larger the value is, the
8253-0 8253-1 8253-2 8253-3 8253-4 Graphics wider the color range to be
printed only with the black
8254-0 8254-1 8254-2 8254-3 8254-4 Image
toner becomes. The smaller
the value is, the narrower this
color range becomes.
Acceptable values: 1 to 255

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".

6.3.11 “PureBlack/PureGray” threshold adjustment (XPS)

Notes:
This adjustment is not supported by LL20/25ppm model.

<Adjustment Mode (05)>

Original mode
Item to be
Photogra Presentat Color Remarks
General Line art adjusted
phic ion profile
8249-0 8249-1 8249-2 8249-3 8249-4 Text The larger the value is, the
8250-0 8250-1 8250-2 8250-3 8250-4 Graphics wider the color range to be
printed only with the black
8251-0 8251-1 8251-2 8251-3 8251-4 Image
toner becomes. The smaller
the value is, the narrower this
color range becomes.
Acceptable values: 1 to 255

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".

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SETTING / ADJUSTMENT
6 - 59
6.3.12 Toner limit threshold adjustment
Notes:
1200dpi is not supported by LL20/25ppm model.

<Adjustment Mode (05)>

Smooth/
Detail
Auto Smooth Detail
(PS/PCL/ Paper type Remarks
(PS/PCL/ (1200dpi) (1200dpi)
XPS)
XPS)
8071-0 8070-0 8090-0 8089-0 Plain paper When you set a larger value,
8071-2 8070-2 8090-2 8089-2 Recycled paper the density becomes high in
some parts of the high
8071-3 8070-3 8090-3 8089-3 Thick paper 1 density area since the
8071-4 8070-4 8090-4 8089-4 Thick paper 2 maximum amount of toner
adhering increases.
8071-7 8070-7 8090-7 8089-7 Special paper 1
When you set a smaller
8071-8 8070-8 8090-8 8089-8 Special paper 2 value, the reproduction of the
8071-11 8070-11 8090-11 8089-11 Envelope gradation tends to be
reduced since the maximum
8071-12 8070-12 8090-12 8089-12 OHP film
amount of toner adhering
decreases and the maximum
density becomes low.
Be aware that if too large a
value is set, offsetting
occurs.

Acceptable values: 0 to 255

(Default: 128)

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".

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SETTING / ADJUSTMENT
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6.3.13 Sharpness adjustment
This adjustment is applied when images need to be softer or sharper.
The adjustment for each original mode is available.
The performance of this adjustment differs depending on the setting value of 05-7322 or 05-8102 with
“ P. 6-58 "6.3.7 Fine line enhancement switchover"” as shown below.

<Adjustment Mode (05)>

When the value of 8102 is "0"

Color
Item to be Red Twin
Present Black Remarks
adjusted General Photo Line art Seal color
ation
Color
Text 8110-0 8111-0 8112-0 8113-0 8109-0 8108-0 8118-0 The larger the
Graphics 8110-1 8111-1 8112-1 8113-1 8109-1 8108-1 8118-1 value is, the
Image 8110-2 8111-2 8112-2 8113-2 8109-2 8108-2 8118-2
sharper the 6
image
becomes. The
smaller the
value is, the
softer the
image
becomes.
Acceptable
values: 0 to 255
(Default: 128)

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SETTING / ADJUSTMENT
6 - 61
When the value of 8102 is "1"

Color
Item to be Red Twin
Present Black Remarks
adjusted General Photo Line art Seal color
ation
Color
Text/ 8110-0 8111-0 8112-0 8113-0 8109-0 8108-0 8118-0 The larger the
Others value is, the
Thin text 8110-1 8111-1 8112-1 8113-1 8109-1 8108-1 8118-1 sharper the
image
Image 8110-2 8111-2 8112-2 8113-2 8109-2 8108-2 8118-2
becomes. The
smaller the
value is, the
softer the
image
becomes.
Acceptable
values: 0 to 255
(Default: 128)

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".

6.3.14 Thin line width lower limit adjustment

Notes:
Code 05-8241 is not supported by LL20/25ppm model.

<Adjustment Mode (05)>

Code Remarks
8240 Sets the lower limit value of the thin line width when “Distinguish Thin Lines” is
(600dpi) selected in the screen selecting menu of the printer driver.
8241 The larger the value is, the thicker (darker) the thin line becomes.
(1200dpi) Acceptable values: 1 to 9
(Default: 2)
<Procedure>
The procedure is the same as that of P. 6-57 "6.3.4 Adjustment of faint text".

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SETTING / ADJUSTMENT
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6.3.15 Offsetting adjustment for background processing
The density of background can be adjusted as follows.
Notes:
PS, XPS, and 1200dpi are not supported by LL20/25ppm model.

<Adjustment Mode (05)>

PS PCL XPS 1200dpi

Mode Remarks
Smooth Detail Smooth Detail Smooth Detail Smooth Detail
Color 8010-0 8013-0 8010-1 8013-1 8010-2 8013-2 8016 8017 The larger
Twin 8011-0 8014-0 8011-1 8014-1 8011-2 8014-2 - - the value is,
Color the darker
Black 8012-0 8015-0 8012-1 8015-1 8012-2 8015-2 8018 8019 the
background
becomes.
The smaller
the value is, 6
the lighter
the
background
becomes.
Acceptable
values: 0 to
255
(default:
128)

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".

6.3.16 Color/black judgment setting for twin color printing images

The color reproduction of the image object is specified in the twin color mode.
<Adjustment Mode (05)>

Code Remarks
8218 0 : Reproduced with black and the specified color
1 : Reproduced with black only
Acceptable values: 0 to 1 (Default: 0)
<Procedure>
The procedure is the same as that of P. 6-57 "6.3.4 Adjustment of faint text".

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SETTING / ADJUSTMENT
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6.3.17 LED emission level adjustment
The LED emission level in the BOX printing (black/binary), network FAX and e-mail FAX can be set.
The size of the dots can be adjusted.

<Adjustment Mode (05)>

Code Item to be adjusted Remarks

7330-0 LED emission level 0/4 The smaller the value is, the smaller the LED
7330-1 LED emission level 1/4 emission level of the primary scanning direction
becomes. Therefore, the smaller dots are reproduced
7330-2 LED emission level 2/4 accordingly.
7330-3 LED emission level 3/4 Acceptable values: 0 to 255
7330-4 LED emission level 4/4 (Default: Level 0/4: 0, Level 1/4: 63, Level 2/4: 127,
Level 3/4: 191, Level 4/4: 255)

Restart the equipment, and perform the printing job.

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".
Notes:
• The setting value must increase as the LED emission level number (0 to 4) becomes higher. Do
not increase this order when setting the values.
• Usually, LED emission level 4 / 4 is the most effective in the black mode.
• It is not applied to the images printed in the Black mode by the printer driver.

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SETTING / ADJUSTMENT
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6.3.18 Density adjustment of graphic lines (1200 dpi)
This adjustment is available regardless of whether "Distinguish Thin Lines" of the printer driver is
selected or not.

Notes:
Code 05-8242 and 05-8243 are not supported by LL20/25ppm model.

<Adjustment Mode (05)>

Color mode Code Remarks

Color/Black 8242-0 The density of the line in Black in the line density range specified
by "05-8243-0" or "05-8243-1" can be adjusted.

The larger the value is, the darker the line density becomes.
Acceptable value: 0 to 5 (Default: 3)
8242-1 The density of the line in Yellow, Magenta, Cyan, and Black in 6
the line density range specified by "05-8243-2" or "05-8243-3"
can be adjusted.

The larger the value is, the darker the line density becomes.
Acceptable value: 0 to 5 (Default: 1)

Color mode Code Remarks

Color/Black 8243-0 The effective range (lower limit) of the The density range
density adjustment for the line in Black can selected in the
be set. upper and lower
limit is adjusted with
Acceptable value: 0 to 255 (Default: 1) 05-8242-0.
8243-1 The effective range (upper limit) of the
density adjustment for the line in Black can
be set.
Acceptable value: 0 to 255 (Default: 200)
8243-2 The effective range (lower limit) of the The density range
density adjustment for the line in Yellow, selected in the
Magenta, Cyan, and Black can be set. upper and lower
limit is adjusted with
Acceptable value: 0 to 255 (Default: 1) 05-8242-1.
8243-3 The effective range (upper limit) of the
density adjustment for the line in Yellow,
Magenta, Cyan, and Black can be set.

Acceptable value: 0 to 255 (Default: 255)

Notes:
Be sure to set the values of the upper and lower limit properly so that they are not set in reverse.
The line density adjustment codes with black (8242-0, 8243-0 and 8243-1) are in common for
both the color and black modes.

<Procedure>
The procedure is the same as that of P. 6-53 "6.3.2 Gamma balance adjustment (Black Mode)".

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SETTING / ADJUSTMENT
6 - 65
6.4 Image Quality Adjustment (Scanning Function)

6.4.1 Gamma balance adjustment

The gamma balance at the Black Mode is adjusted by adjusting the density. The adjustment is
performed by selecting its density area from the following: low density, medium density and high
density.

<Adjustment Mode (05)>

Black
Original mode Gray Item to be
Remarks
Text/ Custom Scale adjusted
Text Photo
Photo mode
7485-0 7486-0 7487-0 7480-0 7488-0 Low density The larger the value is, the density of the
7485-1 7486-1 7487-1 7480-1 7488-1 Medium density item to be adjusted becomes darker.
Acceptable values: 0 to 255
7485-2 7486-2 7487-2 7480-2 7488-2 High density (Default: 128)

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the code corresponding to the desired original mode and press the [START] button.
(3) Key in the value corresponding to the density area to be adjusted (0, 1 or 2) and press the
[START] button.
0: Low density (L), 1: Medium density (M), 2: High density (H)
(4) Key in the adjustment value. (To correct the value once keyed in, press the [CLEAR] button.)
(5) Press the [OK] or [INTERRUPT] button to store the value in memory.
o The equipment goes back to the ready state.
(6) For resetting the value, repeat step (2) to (5).
(7) Let the equipment restart and perform the scanning job.
(8) If the desired image has not been attained, repeat step (1) to (7).

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SETTING / ADJUSTMENT
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6.4.2 Density adjustment

Adjusts the center density.

<Adjustment Mode (05)>

Original mode
Color Item to be
Text/ Custom Remarks
Mode Text Photo adjusted
Photo mode
Color 8339 8340 8341 8380 Manual The larger the value is, the
density center darker the image becomes.
value Acceptable values: 0 to 255
(Default: 128)

<Adjustment Mode (05)>

Original mode 6
Gray Item to be
Mode Text/ Custom Remarks
Text Photo Scale adjusted
Photo mode
Black 7444 7445 7446 7475 7447 Manual The larger the value is, the
density center darker the image becomes.
value Acceptable values: 0 to 255
7456 7457 7458 7478 7459 Automatic (Default: 128)
density
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in a code and press the [START] button.
(3) Key in an adjustment value (acceptable values: 0 to 255).
(To correct a value once keyed in, press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value in memory.
o The equipment goes back to the ready state.
(5) Let the equipment restart and perform the scanning.
(6) If the desired image quality has not been attained, repeat step (1) to (5).

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SETTING / ADJUSTMENT
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6.4.3 Background adjustment (Color Mode)
The adjustment level of background center value is adjusted. The control value of background
adjustment button is automatically adjusted to the same level as the adjusted center value.
For example, when the control value of background adjustment key ranges from 0 to 6, the background
center value (-2 to +2) is used to be the range from 6 to 14 accordingly.

Before adjustment +2 +1 0 -1 -2

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

After adjustment +2 +1 0 -1 -2

Fig.6-23

<Adjustment Mode (05)>

Code Original mode Remarks

8309 Text/Photo The smaller the value is, the background becomes lighter.
8310 Text Acceptable values: 0 to 255 (Default: 128)
8311 Photo
8370 Custom mode

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the codes and press the [START] button.
(3) Key in the adjustment values. Acceptable values: 0 to 50. (To correct the value once keyed in,
press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value in memory. o The equipment goes
back to the ready state.
(5) Let the equipment restart and perform the scanning job.
(6) If the desired image has not been attained, repeat step (1) to (5).

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SETTING / ADJUSTMENT
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6.4.4 Background adjustment (Black/Grayscale)
The density of background can be adjusted as follows.

<Adjustment Mode (05)>

Code Color mode Original mode Remarks

7436 Black Text/Photo The smaller the value is, the background
7437 Text becomes lighter.
Acceptable values: 0 to 255 (Default: 128)
7438 Photo
7441 Custom mode
7439 Grayscale -

<Procedure>
The procedure is the same as that of P. 6-67 "6.4.2 Density adjustment".

6
6.4.5 Judgment threshold for ACS (common for copy and network
scan)
The judgment level is adjusted for the automatic identification of whether the original set on the glass is
black or color. Namely, this is to adjust the judgment level used when “Auto Color” is selected at color
modes. The same adjustment value is simultaneously applied to all cases of originals on the original
glass for copier functions and network scanning functions, and those placed on the RADF.

<Adjustment Mode (05)>

Code Item to be adjusted Contents

7630 Judgment threshold The larger the value is, the more an original tends to be judged as
for ACS black even at the Auto Color Mode. The smaller the value is, the
more it tends to be judged as color.
Acceptable values: 0 to 255 (Default: 70)

<Procedure>:
The procedure is the same as that of P. 6-67 "6.4.2 Density adjustment".

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SETTING / ADJUSTMENT
6 - 69
6.4.6 Sharpness adjustment

If you want to make scan images look softer or sharper, perform the following adjustment. The
adjustment can be made for each of the color modes and original modes independently.

<Adjustment Mode (05)>

Code Color mode Original mode Contents

8354 Full Color Text/Photo The larger the value is, the sharper the image
8335 Text becomes; while the smaller the value is, the softer
the image becomes.
8336 Photo
The smaller the value is, the less moire tends to
8375 Custom mode appear.
7430 Black Text/Photo The acceptable values are 0 to 255.
7431 Text The center value is 128.
7432 Photo
7470 Custom mode
7433 Gray Scale -
Notes:
You have to make adjustment by balancing between moire and sharpness.

<Procedure>
The procedure is the same as that of P. 6-67 "6.4.2 Density adjustment".

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SETTING / ADJUSTMENT
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6.4.7 Fine adjustment of black density
The density of black side on scanned image is adjusted at color-scanning.

<Adjustment Mode (05)>

Code Original mode Remarks

8314 Text/Photo The larger the value is, the black side of the image becomes darker.
Acceptable values: 0 to 4 (Default: 1)
8315 Text The larger the value is, the black side of the image becomes darker.
8316 Photo Acceptable values: 0 to 4 (Default: 0)
8371 Custom mode
Notes:
Be careful for the value not to be too large since the gradation is reproduced worse in darker
side.

<Procedure> 6
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the codes and press the [START] button.
(3) Key in the adjustment values. Acceptable values: 0 to 4. (To correct the value once keyed in,
press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value in memory. o The equipment goes
back to the ready state.
(5) Let the equipment restart and perform the scanning job.
(6) If the desired image has not been attained, repeat step (1) to (5).

6.4.8 RGB conversion method selection

The color space conversion method of image is decided at color-scanning.

<Adjustment Mode (05)>

Code Original mode Remarks

8319 Text/Photo 0: sRGB, 1: AppleRGB, 2: ROMMRGB, 3: AdobeRGB
8320 Text (Default: 0)
8321 Photo
8372 Custom mode

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the codes and press the [START] button.
(3) Key in the adjustment values. Acceptable values: 0 to 3. (To correct the value once keyed in,
press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value in memory. o The equipment goes
back to the ready state.
(5) Let the equipment restart and perform the scanning job.
(6) If the desired image has not been attained, repeat step (1) to (5).

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SETTING / ADJUSTMENT
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6.4.9 Adjustment of saturation
The saturation of the scanned image is adjusted for color-scanning.

<Adjustment Mode (05)>

Code Original mode Remarks

8324 Text/Photo The larger the value is, the brighter the image becomes.
8325 Text The smaller the value is, the duller the image becomes.
Acceptable values: 0 to 255 (Default: 128)
8326 Photo
8373 Custom mode

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the codes and press the [START] button.
(3) Key in the adjustment values. Acceptable values: 0 to 255.
(To correct the value once keyed in, press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value in the memory. o The equipment goes
back to the ready state.
(5) Let the equipment restart and perform the scanning job.
(6) If the desired image has not been attained, repeat step (1) to (5).

6.4.10 Background offsetting adjustment for RADF (common for copy,

scan and fax)
The background level for scanning originals with the RADF is adjusted when the background fogging at
the scanning of a manually-set original and an original used with the RADF is different. This is to adjust
the level of the background image removed when the scanning of the originals with the RADF is
performed.

<Adjustment Mode (05)>

Color mode Code Remarks

Color 7026 The larger the value is, the darker the background density
Black 7025 becomes.
Acceptable values: 0 to 255
(Default: 128)

<Procedure>
The procedure is the same as that of P. 6-67 "6.4.2 Density adjustment".

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SETTING / ADJUSTMENT
6 - 72
6.4.11 Adjustment of the capacity and image quality of SlimPDF
The compression quality or the resolution is adjusted to reduce the file capacity of a SlimPDF or
improve its quality.

<Adjustment Mode (05)>

Item to be
Code Remarks
adjusted
9104 Compression The smaller the value, the less the file capacity and the lower the
quality of image quality becomes. The larger the value, the greater the file
SlimPDF capacity and the higher the image quality becomes.
background Acceptable values: 0 to 10 (Default: 5)
processing
9107 Resolution of The smaller the value, the less the file capacity and the lower the
SlimPDF image quality becomes. The larger the value, the greater the file
background capacity and the higher the image quality becomes.
processing 0: 75dpi 6
1: 100dpi
2: 150dpi
3: 200dpi
Acceptable values: 0 to 3 (Default: 1)
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.

(2) Key in the codes to be adjusted and press the [START] button.

(3) Key in the adjustment value. (To correct a value once keyed in, press the [CLEAR] button.)

(4) Press the [OK] or [INTERRUPT] button to store the value in memory. -> The equipment goes
back to the ready state.

(5) Let the equipment restart. Acquire the SlimPDF file and check it.

(6) If the desired image quality has not been attained, repeat step (1) to (5).

6.4.12 Surrounding void amount adjustment

The void amount around the network scanned image is adjusted.
In network scanning, since the void amount is very small in stored images, a shadow may appear
around the scanned image due to the subtle difference in the original sizes. This shadow can be
eliminated by adjusting the setting value.
The setting value is applied to all resolutions and color modes.

<Adjustment Mode (05)>

Code Item to be adjusted Remarks

7489 Surrounding void When the value increases, the blank area around the scanned
amount adjustment image becomes wider, and the data on the image decrease.
Acceptable values: 0 to 255 (Default: 0)
The setting value "1" is equal to 1 dot with 600 dpi. (The value
"24" is equal to approx. 1 mm.)

<Procedure>
The procedure is the same as that of P. 6-67 "6.4.2 Density adjustment".

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SETTING / ADJUSTMENT
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6.4.13 Judgment threshold adjustment for blank originals (common for
copy and scan)
The judgment level is adjusted for automatic identification of whether the original set is blank or not.
This adjustment is made when “OMIT BLANK PAGE” is selected on the control panel.
The adjustment value is simultaneously applied to all modes at PPC and scanning.

<Adjustment Mode (05)>

Code Item to be adjusted Remarks

7618 Judgment threshold The larger the value is, the more an original tends to be
adjustment for blank judged as a bank sheet.
original Acceptable values: 0 to 255 (Default: 128)

<Procedure>
The procedure is the same as that of P. 6-67 "6.4.2 Density adjustment".

6.4.14 JPEG compression level adjustment

The compression level for saving the scanned data in the JPEG format can be adjusted as follows.

<Adjustment Mode (05)>

Code Item to be adjusted Remarks

8304-0 High quality The larger the value is, the better the quality becomes, and
8304-1 Standard the larger the size of file becomes.
Acceptable values: 0 to 255 (Default: 128)
8304-2 Low quality

<Procedure>
The procedure is the same as that of P. 6-67 "6.4.2 Density adjustment".

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SETTING / ADJUSTMENT
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6.4.15 ADF noise reduction (Scanning Function)
The noise reduction level for streaks can be adjusted with the following codes when a scan job is
performed using the ADF while its scan noise reduction function is set to enable (*).
* When [LOW], [MIDDLE] or [HIGH] is selected in the [ADMIN] tab of the [USER FUNCTIONS] menu,
or when "0", "1" or "2" is selected in 08-8300.
<Adjustment Mode (05)>

Color
Original mode
Item to be adjusted Remarks
Text/ Custom
Text Photo
Photo mode
8413 8414 8415 8412 ADF noise reduction When the value decreases, the
effect of reducing streaks
becomes larger. When the value
increases, the effect of reducing
streaks becomes smaller.
When "0" is set, this function is 6
disabled.
Acceptable values: 0 to 200
(Default: 100)

Black
Original mode Gray
Item to be adjusted Remarks
Text/ Custom scale
Text Photo
Photo mode
7401 7402 7403 7400 7404 ADF noise reduction When the value decreases, the
effect of reducing streaks
becomes larger. When the value
increases, the effect of reducing
streaks becomes smaller.
When "0" is set, this function is
disabled.
Acceptable values: 0 to 200
(Default: 100)

Notes:
• Remember the image specifications and life span of the replacing parts may not meet the
standard when the setting value is changed from the default value.
• If too small a value is set, the text may not be printed clearly.

<Procedure>
The procedure is the same as that of P. 6-67 "6.4.2 Density adjustment".

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SETTING / ADJUSTMENT
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6.5 Image Quality Adjustment (FAX Function)

6.5.1 Density adjustment

The center density and the density variation controlled by density adjustment keys can be adjusted as
follows.

<Adjustment Mode (05)>

Original mode
Color Item to be
Text/ Remarks
mode Text * Photo adjusted
Photo
Black 7533 7534 7535 Manual density [TEXT/PHOTO], [PHOTO]: The larger
center value the value is, the darker the image
becomes.
[Text]: The larger the value is, the lighter
the image becomes.
Acceptable values: 0 to 255 (Default:
128)
7542 - 7543 Automatic The larger the value is, the darker the
density mode image becomes.
Acceptable values: 0 to 255 (Default:
128)
* Since the gradation in this mode is reproduced in a binary image (black and white), this adjustment
should be a simple binary threshold adjustment.

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in a code and press the [START] button.
(3) Key in an adjustment value.
(To correct the value once keyed in, press the [CLEAR] button.)
(4) Press the [OK] or [INTERRUPT] button to store the value. o The equipment goes back to the
ready state.
(5) Turn the power OFF.

<Confirmation>
If possible, perform a Fax transmission and check the adjusted density with the image on the recipient's
side.

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6.5.2 LED emission level adjustment
The LED emission level in the fax function can be set. In this setting the size of dots is adjusted.

<Adjustment Mode (05)>

Code Item to be adjusted Remarks

7594-0 LED emission level 0/4 The smaller the value is, the smaller the LED
7594-1 LED emission level 1/4 emission level becomes. Therefore, the smaller dot is
reproduced accordingly. Acceptable values: 0 to 255
7594-2 LED emission level 2/4
(Default: Level 0/4: 0, Level 1/4: 63, Level 2/4: 127,
7594-3 LED emission level 3/4 Level 3/4: 191, Level 4/4: 255)
7594-4 LED emission level 4/4

<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in a code and press the [START] button.
(3) Key in a sub-code and press the [START] button. 6
(4) Key in an adjustment value.
(To correct a value once keyed in, press the [CLEAR] button.)
(5) Press the [OK] or [INTERRUPT] button to store the value. o The equipment goes back to the
ready state.
(6) Take the POWER OFF.

<Confirmation>
Check the LED emission level setting with the actual fax data received, if possible.
Notes:
• The setting value must increase as the LED emission level number (0 to 4) becomes higher. Do
not increase this order when setting the values.
• Usually, LED emission level 4 / 4 is the most effective in the black mode.

6.5.3 Background offsetting adjustment for RADF (common for copy,

scan and fax)
The background level for scanning originals with the RADF is adjusted when the background fogging at
the scanning of a manually-set original and an original used with the RADF is different. This is to adjust
the level of the background image removed when the scanning of the originals with the RADF is
performed.

<Adjustment Mode (05)>

Color mode Code Remarks

Black 7025 The larger the value is, the darker the background density
becomes.
Acceptable values: 0 to 255
(Default: 128)

<Procedure>
The procedure is the same as that of P. 6-29 "6.2.2 Density adjustment".

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SETTING / ADJUSTMENT
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