Hewlett-packard Development Company, L.p.

Juan Luis López Rodríguez

Marc Bautista Palacios

Jordi Hernandez Creus

Lorena Fernández Llorens

A diagnostic device comprises a comparison section to compare an input voltage with a threshold voltage, wherein the input voltage is a power supply voltage for a component on a circuit board; and an indicator to provide an indication of the result of the comparison by the comparison section, the indication to render the circuit board identifiable to direct inspection, wherein the supply of power to the component is independent of the result of the comparison.

Diagnostic device, apparatus and method

A power supply circuit has parallel supply and control branches each with fuses, the power supply branch comprising at least one replaceable fuse. The supply branch is connected to one or more electrical components of an electrical device, such as the actuator and sensors of a printer, and the supply branch is connected to control or monitoring components. A circuit comprising lights indicates correct or faulty operation of the various parts of the supply circuit.

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Subirats Barcelona, Spain

Juan Luis López Rodríguez