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Re: [softrock40] Digest Number 5395

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  • Michael Castle
    Message 1 of 1 , Apr 11, 2013
    • 0 Attachment
      On 11/04/2013, softrock40@yahoogroups.com <softrock40@yahoogroups.com> wrote:
      > [image: Yahoo! Groups]
      > Softrock-40 Interest Group Group
      > 2 New Messages
      > Digest #5395
      > 1a
      > Re: Info on Dolby Advance Audio sound card by "Alan" alanzfq
      > 2
      > Was Working - Died by "Mike Saeger" devmrs
      >
      > Messages
      > 1a
      > Re: Info on Dolby Advance Audio sound card
      > Wed Apr 10, 2013 1:56 pm (PDT) . Posted by:
      > "Alan" alanzfq
      >
      > ----- Original Message -----
      > Subject: Re: [softrock40] Info on Dolby Advance Audio sound card
      >
      >> many (most?)
      >> laptops seem to not have the required stereo input.
      >
      > Mike,
      >
      > I'm not so sure.
      > Even my mere netbook has a 192K sound system.
      > Often the mic input may be configured as stereo but this is not mentioned in
      > the manual.
      > And Dolby Advance Audio does not sound mono.
      >
      > 73 Alan G4ZFQ.
      >
      > Reply to sender . Reply to group . Reply via Web Post . All Messages (4) .
      > Top ^
      > 2
      > Was Working - Died
      > Thu Apr 11, 2013 2:39 am (PDT) . Posted by:
      > "Mike Saeger" devmrs
      > I went on a 1 week trip forgetting to turn the Softrock off. Came back and
      > it was dead.
      >
      > I checked S12V and it was just over 6V on RX. Goes up to around 8V on TX.
      >
      > I replaced Q3 because it was VERY HOT. New one also gets VERY HOT on just on
      > Rx.
      >
      > Apparently, something happened to the switching circuit.
      >
      > I'm getting the 11.64 volts at the base of Q3 (with Q3 disconnected)
      >
      > Voltage at pin #4 of U4 is around 6.09V (Q3 disconnected) diagram says it
      > should be over 9V.
      >
      > With Q3 disconnected, total current draw is around 30ma. With Q3 connected
      > it zooms up to over 100 ma on RX and on TX it exceeded 250 ma with no drive.
      >
      > When it was working S12V was almost 12V and about 0V on RX.
      >
      > I admit I really don't understand FETs and don't know how to check them.
      > There are several of those BS170s.
      >
      > Any ideas on what I can check before I give up? It was so much fun using
      > that radio -- I'd hate to have to toss it out. I tried searching for
      > SoftRock repair but it looks like if i can't fix it I'll have to toss it
      > out.
      >
      > Mike N9MS
      >
      > Reply to sender . Reply to group . Reply via Web Post . All Messages (1) .
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