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C-2X right channel soud issues

Discussion in 'Yamaha' started by Domidom, Dec 2, 2018.

  1. Domidom

    Domidom New Member

    Messages:
    14
    Hello,

    Owner (not yet quite a happy :)) a couple c-2x b-2x I encounter some problems with the preamp c-2x.

    I will try to explain at best my concern with my basic English, thank you for your understanding!

    Sound disappearing right channel after a few minutes of listening, when it happens it is enough that I hit very very slightly rca or that I tapped on the carcass for it to work a few minutes but it does not last it is very difficult to find the right position,
    this product on all entries, I have already controlled if it did not come from the source and knobs and obviously no problem on this side.

    I opened the amp to control the welds at the level of RCA but nada, everything is in order and apparently in very good condition for his age.

    In short, I do not know what to do if a charitable soul could meggle!

    In waiting to read you!

    Musically Dominic
    IMG_5616.JPG IMG_5620.JPG IMG_5621.JPG IMG_5623.JPG IMG_5624.JPG IMG_5628.JPG IMG_5629.JPG IMG_5630.JPG IMG_5631.JPG IMG_5632.JPG
     
    Last edited: Dec 2, 2018
    mbz likes this.

     

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  2. Domidom

    Domidom New Member

    Messages:
    14
  3. avionic

    avionic " Black Knights " Subscriber

    Messages:
    44,613
    Location:
    Fort Dodge, Iowa
    Sounds like a bad solder connection. Which RCA did you wiggle?
     
  4. Domidom

    Domidom New Member

    Messages:
    14
    Hello avionic, it happens on all RCA channel right, when I exert a slight pressure on them (regardless of the 7 of the right channel) it works again, but since I dismounted the hack has no more effect.
     
  5. avionic

    avionic " Black Knights " Subscriber

    Messages:
    44,613
    Location:
    Fort Dodge, Iowa
    Get a magnifying glass and a bright light. Start closely inspecting each RCA solder connection. Wiggle the RCA and watch the solder connection for loose connections.
     
  6. avionic

    avionic " Black Knights " Subscriber

    Messages:
    44,613
    Location:
    Fort Dodge, Iowa
    The only issues I've ever heard of with these C-2x's is broken RCA jacks.
     

     

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  7. Domidom

    Domidom New Member

    Messages:
    14
    thank you for the information, I will start by checking the welds;)
     
  8. stoutblock

    stoutblock If it sounds good, it is good... Subscriber

    Messages:
    9,765
    Location:
    Northwest USA
    Check the RCA solder connections to the board. My guess is to just re-wet them all with a soldering iron. If the RCA connectors have any trauma they tend to break the solder joint on the board first.

    Like Dave says the RCA connector itself may be cracked or broken. Look for cracks in the plastic part.
     
    Last edited: Dec 4, 2018
  9. Domidom

    Domidom New Member

    Messages:
    14
    Hello,

    I tested all tracks and taken RCA and no concern for continuity, now the problem is on both channels,

    I unscrewed the panel or there rca I noticed that when I get the screws between the rca it works again some time, suddenly I wonder if there will not be a concern for mass electrical.

    the good news is that by reattaching the rca panel correctly, it means i have no tu fumbling rca anymore, either it works or not.

    edit:

    After 1 hour of testing it starts again on both channels randomly (sound drop and crackles)

    When it happens I change the source with the selector and then I come back it works again.

    IMG_5686[5697].jpg


    Thanks for the help!
     
    Last edited: Dec 5, 2018
  10. theophile

    theophile Pheasant Plucker. Subscriber

    The C2x is a really good preamp with really strange electrical problems. Most to do with RCAs.
     
    Domidom likes this.

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