<p>A braille embosser device includes a plurality of hammers configured to strike a substrate and thereby produce thereon braille-readable projections. A controller is connected to the hammers and controls the striking by the hammers. The controller includes drivers each of which is connected to and drives a respective one of the hammers. A fault detection circuit detects a fault associated with one of the drivers and, in response to the fault, ceases the striking by the hammers.</p>
