Quote:
Originally Posted by Chris K
So here is a question that puts my inexperience on full display. The electrolytic caps C131, C132, C116, C127 and C128 are not grounded to the chassis. When I have substituted for them, I've just tied all of the negative leads of the new caps to one another on a terminal strip. For example, the original C131 has a 30uf and a 10uf cap. I disconnected the leads to C131, put in a terminal strip, tied the negative leads of replacement 47 and 10uf caps together and re-soldered the chassis wiring back to the new caps. I didn't pay attention to replicating the negative lead specificity from the connections to the old cap because placing a meter lead on any of the 4 negative leads exiting the bottom of the original gave me the same capacitance reading on the 30uf and 10uf caps in the original. Would this be the correct thing to do, just tying the replacement capacitor negative leads and soldering the chassis leads that had in the original configuration gone to 2 negative leads on C131 to the single new tied negative? I'm not sure if my connections to the negative leads of the new electrolytic caps is causing new problems. TIA for any assistance.
Chris
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Per Riders schematic C128B,C131A,C127A, C128A have their common negative leads going to the center tap of the power transformer(which is how the negative supply voltages are developed because the center tap is not tied directly to ground, instead negative voltage is formed across resistance to ground). However the negative lead of C116B actually goes directly to chassis ground. C132 also does not share a common negative with the other caps.