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Diagnostic device, apparatus and method

  • US 10,359,452 B2
  • Filed: 07/11/2012
  • Issued: 07/23/2019
  • Est. Priority Date: 07/11/2012
  • Status: Active Grant
First Claim
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1. A diagnostic device comprising:

  • a main power supply line onto a printhead circuit board of a printer, the power supply line to receive a power supply voltage from off the circuit board;

    a comparison section to compare the power supply voltage with a threshold voltage, the comparison section detecting an overvoltage condition on the power supply line; and

    an audio or visual indicator mounted to the circuit board to provide an indication to a technician of the overvoltage condition on the power supply line,wherein power continues to be supplied to components on the circuit board after the overvoltage condition is detected and wherein the indicator remains activated independent of subsequent values of the power supply voltage.

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