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Sansui ca-3000

Discussion in 'Exclusively Sansui' started by loudvette, Sep 12, 2018.

  1. loudvette

    loudvette New Member

    Messages:
    11
    Hi all, recently purchased a ca-3000. Running tests, the right meter 4300840 meter dead. Where can I get one?
    #riffshifi
     

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  2. loudvette

    loudvette New Member

    Messages:
    11
    I did ohm it. Left moves right nothing. It’s also stuck low on the range and won’t move with powering up or balance or input changing.
     
  3. DougBrewster

    DougBrewster AK Subscriber Subscriber

    Messages:
    521
    Looks like it's jammed; maybe a piece of crud between the coil and magnet? I wouldn't ohm it for testing. It probably only takes a couple of hundred millivolts for full scale...
     
  4. lbcgav

    lbcgav AK Subscriber Subscriber

    Messages:
    841
    Location:
    Arcadia, CA
    Ok I was going to quote Punker X but it looks like you've already tested it:

     
  5. DougBrewster

    DougBrewster AK Subscriber Subscriber

    Messages:
    521
    I haven't tested that particular meter but they're typically 200-300mV and 200-300uA for full scale. Multi-meters push out about a volt and you've got a meter there that could be very hard to replace... I already looked in sansui-parts-shop and he doesn't have any. If your ohm meter flicked when you tested the movement at least it tells you the coil isn't open.
     
  6. loudvette

    loudvette New Member

    Messages:
    11
    No flicker. Could be stuck, but look at the pics, you will see the right meter is below the chart. Ill pull it open tonight and see if it has shit in it
     

     

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  7. Hyperion

    Hyperion Roobarb & Custard Subscriber

    Messages:
    48,024
    Location:
    Hertfordshire, UK
    Be careful, those meter suspensions are extremely delicate - and as already hinted - even the voltage from a multimeter could damage the coil unless applied for a very short time. Hidden out of sight in your pictures there is usually a mechanical zero setting adjuster (like the head of a screw) in the front panel of the meter, you could try gently turning that to see if you can move the needle.
     
  8. Tom B

    Tom B AK Subscriber Subscriber

    Messages:
    1,467
    Location:
    Bay Ridge, Brooklyn New York
    As others have said, be very careful but it seems to be jammed and holpfully you can free it. There is one for sale on Ebay but its going for $190, so as we say, BE CAREFUL
     
  9. loudvette

    loudvette New Member

    Messages:
    11
    the one on ebay is a 4300841 and mine is a 4300840 is there a difference? i don't want to buy one but rather fix it..
     
  10. Tom B

    Tom B AK Subscriber Subscriber

    Messages:
    1,467
    Location:
    Bay Ridge, Brooklyn New York
    it may be different. try to fix what you have
     
  11. loudvette

    loudvette New Member

    Messages:
    11
    So i took it apart last night, needle is free. ohm does nothing.. How can one repair a meter? didn't see any broken wires
     

     

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  12. DougBrewster

    DougBrewster AK Subscriber Subscriber

    Messages:
    521
    sounds like the coil or a connection to it is open somewhere. Hairsprings both connected? Fact that it's reading downscale suggests maybe a spring is not connected. Looking at a spare MC movement I have it may be that the upper hairspring (ie nearest the dial) may have become disconnected...
     
    Last edited: Sep 13, 2018
  13. ManyMoonsAudio

    ManyMoonsAudio AKA paul79 Sponsor Subscriber

    Messages:
    3,063
    Location:
    Tulsa Ok (C-Ville)
    I would look at the other one that works to see what is going on. You will likely HAVE to repair that meter. Finding one of them is likely impossible.
     
  14. slimecity

    slimecity Super Member

    Messages:
    2,996
    Location:
    New Zealand
    Try swapping the leads going to the meters (if possible) as it could actually be an issue with the circuitry driving the meter on that side - rather than the meter itself.

    Are there trimpots to calibrate the meters in the unit?
     
  15. skippy124

    skippy124 Super Member

    Messages:
    1,618
    Location:
    Sydney Australia
    Hi,

    Repairing meters is a specialist job, it is very easy to damage a meter movement if you attempt a repair. I had a BA2000 in for repair a while ago, and one meter wasn't working. See this thread

    http://audiokarma.org/forums/index.php?threads/ba-2000-on-the-bench.694143/#post-9279963

    It is likely that one of the hair springs has broken away from its connection point.

    See post 4 in the above thread re a specialist meter repairer in the US (I sent the meter all the way from Australia to the US for repair).

    Cheers

    John
     
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  16. Tom B

    Tom B AK Subscriber Subscriber

    Messages:
    1,467
    Location:
    Bay Ridge, Brooklyn New York
    I agree that repairing a meter that is "open" in an ohms test, but free movement is a tricky job typically best done by someone that has done this kind of work before. Its very easy to further damage the hair springs that make them unusable.
     
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  17. DougBrewster

    DougBrewster AK Subscriber Subscriber

    Messages:
    521
    If you're lucky a hairspring spring may have broken off at the outer end. Someone with watch/clock repair skills would be able to form a new hook and solder it back. It's tricky... Otherwise it's as the advice above.
     
  18. loudvette

    loudvette New Member

    Messages:
    11
    Fixed it. Wire broke off back spring. Some glasses and soder fixed. I’ll post some pics.
     
  19. Overundr1

    Overundr1 AK Subscriber Subscriber

    Messages:
    2,515
    Location:
    Mississippi
    Very well done sir :)
     
  20. Overundr1

    Overundr1 AK Subscriber Subscriber

    Messages:
    2,515
    Location:
    Mississippi
    Now, about those approximately 100 pass through connections that need to be pinned lol.
    -Lee
     
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