Electronics > Repair

Fluke 5440B repair

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Rax:
Lessons learned on the 5440 series?

* A11 has a slight design issue, where, imho, the transformer needed a different type of fastening to the board. Take a magnifier at the edge connector if symptoms point to issues there, especially if some HV ranges work and others don't.
* Recap. Not indiscriminately (though, really, up to you), but suspect caps being guilty of symptoms you observe.
* Triacs on A13 are suspect. To my surprise, more suspect than the optocouplers (which I've seen go bad before), so examine (both of) them closely.
* Dallas SRAMs tend to go bad. Check the data on them and replace with known good chips with correct bits on them. Data is available from different sources, here and elsewhere

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