I have a Terayon TCM200 canle modem that does not state polarity for the 12VDC power input. The Terayon web site does not help (although I did post a support question currently unanswered). I have opened the case and noted that although the power connector posts go all the way through all layers, there are no connecting traces on the flip side, two of the connector are surrounded by interrupted circles but the other has a solid circle. Does this indicate polarity? Thanks.
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Determining AC adapter polarity required
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