Chapter 1: 7401-2xxx and 3xxx Product Overview 1-27A fuse located on the Inverter Board protects power to the inverter.This fuse protects the system from damage in the event of a Backlightor Inverter Board fault. The fuse is not field replaceable; if it blows, thesafety characteristics of one or more components on the Inverter Boardmay have been compromised and the Inverter Board should bereplaced.If one or both Backlight tubes become disconnected or otherwise open-circuited, protection circuitry shuts down the inverter. This avoidsover-powering a single tube and also protects against high voltageshorting.The Backlight tubes for the Active displays (TFT) can be replaced.Touch ScreenThe Touch Screen completely covers the LCD and is mounted directlyin front of the LCD, behind the front plastic bezel of the terminal. Thetouch controller on the Processor Board supports capacitive andresistive touch glass.The touch glass has an integrated harness that is routed into theProcessor Board enclosure and is connected to a header on theProcessor Board.The touch glass has a glare-reducing texture that also helps hidefingerprints.
