Dell 3110cn Color Laser Printer - Manual (Page 161)

Plain Normal*
Light
Label Normal*
Light
Adjust BTR
NOTICE: The print quality changes depending on the setting values you select for this item.
Purpose:
To specify the reference voltage settings for the transfer roller.
Values:
Plain -3 - +3
0*
Plain Thick -3 - +3
0*
Transparency -3 - +3
0*
Covers -3 - +3
0*
Covers Thick -3 - +3
0*