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Rectifier Bridge

CAUTION: Never use a 110-volt test lamp for this test.
  1. Connect one ohmmeter lead to grounded heat sink. Connect other ohmmeter lead firmly against flat metal portion of terminal (not threaded stud). See Fig 1. Next, reverse leads to same heat sink and terminal. If both readings are same, replace rectifier bridge.
    Fig 1: Bench Testing Rectifier Bridge and Identification of End Frame Components
    G770
  2. A good rectifier bridge will give one high and one low reading. Repeat this same test between grounded heat sink and other 2 flat metal connectors. Next, repeat same test between insulated heat sink and each of its 3 flat metal connectors.
  3. Check other bridge rectifiers in same manner. DO NOT  replace rectifier bridge or diode trio unless one pair of readings is same.
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