If [A] (Auto) is selected as the copy exposure on the Copy Basic Features screen, pressing [Image Qual. Adjustment] and making fine adjustments cancels the automatic copy exposure setting. Similarly, if you select [A] (Auto) for the copy exposure setting when image quality adjustments have been made, the Image Quality Adjustment mode is canceled and the automatic exposure is used instead.
To automatically adjust the quality of the background, select [A] (Auto) for the copy exposure. (See "Automatic Exposure Adjustment.")