![]() possibly tantalum caps on power rails (possibly maybe) Best to swap them all out - something that should have been done a long time ago directly after DC error message and most likely even before that after a total of maybe 2,000 working hours - traces look 'burned' - what ? some 50 electrolytics, mostly 22uf 16V 5mm, but a few other values too. Question is how well and, more importantly, for how long. One fully corroded trace (left on picture) lies bare but still conducts. Several corroded traces and the blue circle shows heavily corroded pads after superficially scratching off the leaked electrolytic skunk. Picture shows the 'problem' part of the board. Several other SMD electrolytics all over the board are also wiggly when touching. Well, after opening the unit and removing dust with a small brush, three SMD electrolytics simply came off - ugly leakage underneath and in vicinity (see picture). (Hmm, I found that same info here on this forum.) Anyway, for the last couple of years the unit has been stored in a dry closet. Owner said that back then some of the traces looked 'burned' and that he thinks I should check tantalum caps on the 5V rails. Problems back then - owner says - were "DC error" warning message, followed by input failure on one channel and complete blackout very soon after. It had been in heavy use until it stopped working in 2015. Spent a brief hour to look over a friend's Ensoniq DP/4+ today to assess whether a repair is worth the effort. ![]()
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