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Subject: Re: [PolySix] some defects after battery leak

From: Johan De Vroede <johandevroede@yahoo.com>
Date: 2015-05-14

Thanks for the reply. I repaired traces that were broken and I checked if there was continuity between traces that should not be connected to each other. I did this only for IC 31 maybe I will take a wider aerea to check on continuity. The weird thing is that most things work as they should and then when you turn one knob several parameters are changed and not only the one you turn. I put it in manual mode so all knobs function as they are set and then I can get some rather good sound but for example when I then turn the resonance of the VCF a bit then other parameters seem to have changed....any other info? I replaced the IC31 and put it on a socket. Could it be that another IC is defective when I have this strange behavior or do you think this is mostly a result of the corrosion?

Thanks again for the reply


At 14-mei-2015 17:13:41, 'Chromatest J. Pantsmaker' chromatest@azburners.org [PolySix]<'PolySix@yahoogroups.com'> wrote:










There are two things (well, more than that actually) that the corrosion will do that we need to pay attention to.

First is the broken trace, or lack of continuity. You've checked this with your meter.

Second is the shorted trace, or too much continuity. By this I mean that a trace can have continuity to a trace next to it. That would cause the signals to affect each other. When you check continuity on the traces, it's important to not only check 1-1, 2-2, 3-3 (and so on) but also to check 1-2, 1-3, 2-3 (and so on) You want all of the 1-1, 2-2, 3-3 traces to have continuity, and you ∗DON'T∗ want the 1-2, 1-3, 2-3 traces to have continuity unless they are actually connected via the schematic.