| Electronics > Repair |
| Fluke 289 not quite sorted. |
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| retiredcaps:
--- Quote from: frenky on December 13, 2017, 06:45:41 am ---It is very strange that nobody tried to reverse engineer 287/289 in the last 10 years. Or at least tried to identify all the elements on it. --- End quote --- I suspect that most owners of the very expensive 287/289 just take advanage of the "lifetime" or minimum 10 year warranty rather than fix it themselves. Others who come here for help usually find that something in the input protection is wrong. |
| frenky:
@retiredcaps: Yes, that makes sense. @purpose: If you still have the good dmm available for inspection, could you repeat all the measurements again relative to the "- pad" instead of the COM? I believe that "- pad" is GND for all the ICs on the board, but it is not on the same potential as COM. And if you could do separate measurements for when dmm is powered off and on, would be really great. I know that it would take quite some time and effort but it would be for greater good. ;) :-DMM |
| purpose:
I think I could arrange that, but only because you're from the land of Melania T. |
| frenky:
Thank you. :-DD Not to downplay Melania's importance ;D but we are a bit more proud of two guys: Goran Dragic "The dragon"- NBA basketball player at Miami Heat; also led our basketball team to victory on EuroBasket 2017 Anže Kopitar - professional ice hockey player and captain of the Los Angeles Kings |
| sacral:
Hi Frenky, I will reply here, maybe it will be useful for more people... The test points are measured in ON (VCA position), on a functional Fluke 287 with the negative pole of the power supply as reference. On Off position, only a few test points have power, the other have 0 volts. There are also a few TPs that i didn't find on the pcb and there are marked with x on the list. Of course I am to lazy to type all the values I find so I will post a picture with my note (I hope it will be clear enough) |
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