2.Copier-specific Adjustments
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2.7.1 To Adjust the Copy Image Quality in the Black Mode
• You can start with any of the procedures. But it is recommended to perform the procedures in order, as
listed below. You can perform one procedure in conjunction with another. But if this changes the image
quality more than required or loses the effectiveness of the adjustment, restore the settings made in
the previously performed procedure to the original ones. Then perform other procedures.
• Both the service technician and the user perform use procedure (1).
• Only the service technician must perform procedures (2) to (3).
(1) Press [Image] tab on the Copy mode. Press [Background Adjustment].
Press [Light] to decrease the background density.
After decreasing the background density, copy and check the image quality.
With the background density set to the minimum, if further image quality adjustments are still
necessary, the service technician must perform the next procedure.
(2) Select [05 ADJUSTMENT MODE]. Change the values for codes[7100] to [7102] and [7105 to 7107]
to adjust the density level of the background.
• The smaller the setting value, the lighter the background becomes, while the larger the setting
value, the darker the background becomes.
Adjust the value and determine the optimal value while checking the copies by considering that
the setting value “25” for the [05] code corresponds to one step in the background adjustment on
the control panel.
If further image quality adjustments are still necessary, perform the next procedure.
(3) Select [05 ADJUSTMENT MODE]. Change the values for codes [7187] and [7189] to [7193] to
adjust the gamma balance in each of low and middle density areas.
• Set the value in increments of approximately 20, while checking the copy image until the optimum
value is obtained.
Adjustment Original mode [05] code
Recommended
value
Acceptable
value range
Default
Black
Text/Photo 05-7100
Set 128 or smaller. 0 to 255 128
Text 05-7101
Photo 05-7102
Image Smoothing 05-7105
User Custom 05-7106
Drop Out Color 05-7107
Original mode [05] code Subcode Recommended value
Acceptable
value range
Default
Text/Photo 05-7190 0/1
Set a value smaller than 128. 0 to 255 128
Tex t 05- 7 1 9 1 0/ 1
Photo 05-7192 0/1
Drop Out Color 05-7187 0/1
User Custom 05-7189 0/1
Gray-Scale 05-7193 0/1
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