| Products > Test Equipment |
| HP 4957A Protocol Analyzer - No power, what to check? |
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| CuriousMarc:
Very late answer to this post, but try to change the small electrolytic C7 near the end of the big green 100k power resistor. That’s the cap for the control circuitry startup power. In my unit it was bad and prevented the power supply from starting. Marc |
| apolon34:
I want to send you a huge thank for this tip. I have the same protocol analyser which I use at work for years and it had the exact same problem, power supply not starting at all and after replacing C7 it is working again ! Many thanks! |
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