Kyocera TASKalfa 3500i Operation Manual page 360

Background Density Adj.
Adjust the density used when the background of documents is automatically adjusted.
Use the procedure below to set the Background Density Adj..
Copy (Auto)
1
Press the System Menu key.
2
Press [ ], [Adjustment/Maintenance] and then [Next] of Background Density Adj..
3
Press [Change] of Copy (Auto).
4
Press [-3] - [+3] (Lighter-Darker) to adjust background density.
5
Press [OK].
Send/Box (Auto)
1
Press the System Menu key.
2
Press [ ], [Adjustment/Maintenance] and then [Next] of Background Density Adj..
3
Press [Change] of Send/Box (Auto).
4
Press [-3] - [+3] (Lighter-Darker) to adjust background density.
5
Press [OK].
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Default Setting (System Menu)