Disabler circuit

摘要

A disabler circuit is disclosed for disabling a function of a device. The disabler circuit includes a switch electrically coupled to an input voltage and to ground. The disabler circuit further includes a fuse electrically coupled a series with the switch between the input voltage and ground. The disabler circuit also includes a resistor electrically coupled and parallel with the switch and in series with the fuse between the input voltage and ground. If the switch is off, then current flows from the input voltage to ground through the resistor and the fuse and the current is too small to blow the fuse. If the switch is on, then current flows from the input voltage to ground through the switch and the fuse and is large enough to blow the fuse. In specific embodiment, the disabler circuit is part of a formatter in a printer to disable a duplexing function of the printer.