KDT 635 3.1.5. Software reset The key combination restarts the KDT 635. 3.1.6. Brightness control To increase the brightness: - Press and hold key F1 - Press key as often as necessary to set the brightness - Release key F1 To decrease the brightness: - Press and hold key F1 - Press key as often as necessary to set the brightness - Release key F1 3.1.7. EPROM capacity regulation (data memory) For this, hook switch S1 (at the rear panel, behind the flap, cf. 3.1.) has to be set: 128 KByte S1 open 256 KByte S1 closed 512 KByte S1 closed S2 must always remain closed (only for checking purposes). 3 - 5