Question about Denon DRA-375RD Receiver

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Need to ID Capacitor

At site C401 of main board. Cap is some kind of polymer electrolytic, but rectangular, not cylindrical. Roughly 9/16"H x 1/2"W x 1/4"D, black plastic case, with flat sheets of polymer/plastic inside. Markings as follows: S 5.5V 0.1F - 6A + This is on the output of a 7806 regulator (IC401). Cap was cracked, regulator ran warm but works out of circuit. Did Denon actually intend to use a 5.5V cap on a 6V rail, or is this an incorrect substitution? Solder joints on cap appear to be factory, but the silkscreen for this part is round. Thanks, Tony

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  • tonym924 Aug 26, 2007

    Well, because...
    1. The receiver isn't functioning yet.
    2. You didn't actually ID the cap that I described.
    3. You didn't specify what cap should be in that location.
    4. You didn't demonstrate any familiarity with this type of circuit, or you would have questioned me about my description of the circuit (as a poster in sci.electronics.repair did) and I would have found the diode between the regulator and the capacitor (so that the rail is ~5.3V, below the 5.5V rating for the cap, though that's not much derating). The reason it's 0.1F, BTW, is that it's a supercap used as backup for the receiver presets.
    4. You refer to 'Dell' in this most recent message when the question is about a Denon receiver.

    Being an electrical engineer, I wouldn't have needed to ask the question if I had the schematic. I would have expected a "Master" to either be familiar enough with the circuit to not need a schematic, or to realize that (s)he didn't know enough without the schematic to draw conclusions about the part.

    Think I'll stick with sci.electronics.repair...

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  • Master
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Tony, this is an incorrect substitution. The cap voltage should be higher. They probably ran out of the cylinder types. I'm surprised to see such high capacitance value however.

Posted on Aug 24, 2007

  • Marty marty Aug 26, 2007

    why only rating of "almost there"? I answered your question, but I cannot, nor can anyone, tell you why Dell did this.

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