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Old 27 March 2020, 09:45   #4
Daedalus
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Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 6,347
Isopropanol, but be gentle. It should be obvious if there's dirt involved because rubbing your finger across the contacts on the PCB would leave dirt on your finger. If that's not the case, the problem is likely elsewhere.
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