![]() On a newer design it is exactly the same when switching crystals, so crystal circuitry is not to be blamed. All capacitors are correct, problems goes with individual resonators when switched between boards, wrong board starts to work flawlessly, good one before switching crystals starts to fail. They are started many times a day, for periods like 10ms, it's low power application. ![]() When we lower the temperature by 5-10 degrees, then resonator refuses to start up. To be more specific we think that quartz crystals are damaged. We have a solid reason to believe that the process was incorrect and as a result there is a big rejection from the production, but we don't know how to go about it, because the cooperation with the contractor is very difficult, basically according to them everything is to blame, only the not made board and one component damaged (we know this for sure, like 99%). There is a reason why there are diagrams that give maximum times, temperatures, generally a window where the process should run. There are components that are sometimes more sensitive and baking in an oven and waiting for everything to melt nicely may cause damage to the most sensitive elements. Hello Does anyone know who in Poland or abroad can professionally deal with checking the correctness of the reflow soldering process of an electronic circuit on already produced electronics? Specifically, I am concerned with the correct behavior of the times at which the board can be in the oven, etc.
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