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Bench Testing: Diodes

  1. Check diodes with a diode tester for shorts or open circuits. If any diode is defective, entire diode holder with diodes installed must be replaced.
  2. If diode tester is not available, diode leads should be quickly and carefully unsoldered and tested with an ohmmeter.
  3. Diodes should show low resistance in flow direction and high resistance in reverse direction.
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