Re: Tektronix 2430A occasionally fails some tests

Bob Koller
 

It is possible, I see many scopes with bad PSU, that will appear to work, sort of. I am quite sure that yours needs caps. The PSU may have been repaired in the past, many were. Likely poorly, with incomplete cap replacement, or cheap underrated parts.

The caps are easily replaced.
Does your instrument have the Dallas parts, or the lithium cell? If the lithium part, it is is probably fine. The Dallas parts if original are on their last leg.

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