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Kenwood KR-1000 issue at first power on

Discussion in 'Kenwood-Trio/Kensonic-Accuphase' started by spaghetti, Nov 28, 2018.

  1. spaghetti

    spaghetti Active Member

    Messages:
    386
    Hi, I got this huge beautiful receiver a few days ago. After internal cleanup I powered it on, all speakers relays started to click like crazy and I thought it must have got damaged during transport. So I turned it off and left it alone a few minutes, with the plug inserted in the wall AC socket.

    After a few minutes I powered it on again and it worked! This time no crazy relays, after a few seconds the relays engaged and situation remained stable.

    The same thing happened today. I worked on the receiver replacing some broken bulbs, then turned it on and relays went crazy. Turn it off, wait a few minutes, turn it on and it's acting normal.

    Any idea of what could be wrong with it? I am a bit intimidated by this receiver, lots of ICs and "modern" electronics...
     

     

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  2. M Chavez

    M Chavez Active Member

    Messages:
    202
    Hi,
    Weird, was just looking at one of those
    Too many 'what ifs' with that one to just start guessing
    I do know that early 1980s Kenwood car and home audio was plagued with cold solder/half soldered joints
    I've had a few like crazy
    Had you put any time on it before you started 'working on it'?
     
  3. M Chavez

    M Chavez Active Member

    Messages:
    202
    You know there's two KR-1000s
    Which one do you have?
     
  4. avionic

    avionic " Black Knights " Subscriber

    Messages:
    44,613
    Location:
    Fort Dodge, Iowa
    Relay driver pass transistor solder connections perhaps?
     
  5. spaghetti

    spaghetti Active Member

    Messages:
    386
    You mean silver/black front? I have the silver one.
     
  6. spaghetti

    spaghetti Active Member

    Messages:
    386
    By the way, I think I have a bad solder (or contact) on the power meter display board... sometimes it works, sometimes it doesn't. When it doesn't, touching the board is enough to make it work again.
     

     

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  7. M Chavez

    M Chavez Active Member

    Messages:
    202
  8. M Chavez

    M Chavez Active Member

    Messages:
    202
    You never said, did you have any real time with it before you started working on it?
    Time to get out a good light and a magnifying glass
     
  9. M Chavez

    M Chavez Active Member

    Messages:
    202
    Definitely ONE of the 10 or 25 or so possibly maybes not counting cold pads and whiskers
     
  10. M Chavez

    M Chavez Active Member

    Messages:
    202
  11. spaghetti

    spaghetti Active Member

    Messages:
    386
    No real time, but no real work either before testing it. I just opened it and removed layers of dust. It's very unlikely that I damaged it in the process.
     

     

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  12. M Chavez

    M Chavez Active Member

    Messages:
    202
    Wasn't implying that you were responsible just looking for an 'optimistic' cause if there were to be such a thing
    like needing to recover a little longer from a deoxit bath
    I briefly had a KR-9400 that was stolen, very similar to yours, if I'm guessing the right model, and it was filled with cracked solder joints
     

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