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  • APC UPS Model PR550i Repaired

    The complaint for this APC UPS Model PR550i was it can’t charge and sometimes (intermittently) all the front panel LED’S lights up. A new battery was replaced with no improvement. Since the problem have some similarity with...

    • Posted October 16, 2008
    • 36
  • Fixing Blue ESR Meter

    Here is an email that i got from one of my ERG member who has successfully built the Blue ESR Meter Kitset. He is a beginner and progress very fast and if you are a beginner too,...

    • Posted October 16, 2008
    • 6
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