It's probably because the contrast setting needs adjustment. The method you should use to adjust contrast depends on your calculator mode.
fx-6300G, fx-7000G, fx-7700GB, fx-8700GB Press the [MODE] key, and then use the left and right keys to adjust contrast. ［left] cursor key: Reduces contrast. [right] cursor key: Increases contrast.
fx-7300G, fx-7700GE, fx-9700GE, CFX-9850 Series (fx-9750G PLUS, fx-9750G), fx-7400 Series, etc. Press the [MENU] key, select the [CONT] icon, and then use the ［left]and [right] cursor keys to adjust contrast.
cfx-9800G Select the [OPTN] icon, and then enter the color contrast adjustment mode. Next, use the ［left]and [right] cursor keys to adjust contrast.
ALGEBRA FX Series From the [MENU] screen, select the [System] icon and then press [F2] key to enter the contrast adjustment mode. Next, use the ［left]and [right] cursor keys to adjust contrast..
fx-9860G Series, fx-CG Series From the [MENU] screen, select the [System] icon and then press [F1] key to enter the contrast adjustment mode. Next, use the ［left]and [right] cursor keys to adjust contrast.
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