Yamaha PC2002M restoration

Discussion in 'Yamaha' started by amr2, Apr 4, 2017.

  1. amr2

    amr2 Active Member

    Messages:
    427
    This switch is for stereo/mono operation. it's in the signal path, and the internal contacts were a "little" dirty...

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    Last edited: May 22, 2017
    OMGCat! likes this.
  2. amr2

    amr2 Active Member

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    427
    I have finished DA/DB boards. I replaced the electrolitic caps and I cleaned the glue, like on the other boards.
    I normally use single-turn cermet trimpots for bias adjust, but this time I decided to try a multiturn type

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    I also changed the speakers relays. This Finder is a perfect replacement.

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  3. zaibatsu

    zaibatsu Active Member

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    441
    My favourite is when you finish adding everything to your cart, and just before you checkout, something goes out of stock.

    I guess someone else really needed all 493 remaining Nichicon ES 22uF/50V.
     
  4. amr2

    amr2 Active Member

    Messages:
    427
    Bad news. I sent some of the black aluminium pieces to re-anodize (heatsinks, top cover, botton cover, handles and face plate), and the company that has done the work has irreversibly damaged most of them. So after buying the amp, and spend money on the restoration, now I have nothing... Anyway I'm looking for a solution.
     
  5. Oilmaster

    Oilmaster Ozzy Subscriber

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    oh noo !!!!
    Sorry to hear that
     
  6. rottalpha

    rottalpha Yamaholic

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    1,165
    Location:
    Middle of Crook County
    :( tears
     
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  7. avionic

    avionic " Black Knights " Subscriber

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    What exactly did they do ? Have they ever done that kind of work for you before ? If the parts are really that mucked up. About the only thing you can do is find a parts unit.
     
  8. amr2

    amr2 Active Member

    Messages:
    427
    No, they haven't worked for me before. I thought that they were professionals, and I trusted them. And they weren't. I think I can save the heatsinks, the front plate and the handles need to be machining (i don't know if machining is the correct word, sorry). I can try to recover the covers the best I can, or make new ones using laser or waterjet cutting. And anodize everything again. But this will cost more than find a parts unit. Using the parts as they are now isn’t an option, It’s not the finish I want.
     
  9. Nashou66

    Nashou66 AK Subscriber Subscriber

    Messages:
    954
    Location:
    West Seneca NY
    Do you have pics of the messed up parts? Im just curious to see.

    Nashou
     
  10. zaibatsu

    zaibatsu Active Member

    Messages:
    441
    Are the top and bottom cover on this model aluminium (aluminum for the US folk)?

    You can only anodize aluminium (and with a special setup, titanium), steel/iron will just dissolve in the anodizing tank.

    Sorry to hear about the failure, hopefully there is a way to finish the project.
     
  11. amr2

    amr2 Active Member

    Messages:
    427
    Yes, the top and bottom covers are aluminium.

    Sorry I don't have the parts in this moment, I sent them to another company to ask for a quote... I will upload some pics as soon as possible.
     
  12. rottalpha

    rottalpha Yamaholic

    Messages:
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    Location:
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    yes, machining is the right word for the process..


    did they sand-blast the aluminum parts to take the paint away and actually use sand in stead of a softer alternative?

    or was it a chemical process that ruined them? during anodizing?
     
  13. amr2

    amr2 Active Member

    Messages:
    427
    They first used a chemical process, then they sanded the parts, and finally they anodize them. The finish was bad, with stains, so they repeated the whole process. The finish was bad again, and in addition the second sanding removed too much material, so aesthetically they are not acceptable. As a plus, the pieces were knocked during transportation. :no:
     
  14. rottalpha

    rottalpha Yamaholic

    Messages:
    1,165
    Location:
    Middle of Crook County
    so their prep work or circulation during the anodyzing process, sucked

    it sounds like a nightmare
     
  15. Oilmaster

    Oilmaster Ozzy Subscriber

    Messages:
    1,047
    Location:
    Paris & The Hague
    What about electrostatic powder coating, if that can be done upon filler used for masking the knocked spots ?
     
  16. amr2

    amr2 Active Member

    Messages:
    427
    Yes, It's a nightmare
     
  17. amr2

    amr2 Active Member

    Messages:
    427
    The finish is not good, I've tried it before. Small bubbles emerge due to anodizing. Even if the parts are sanded.
     
  18. amr2

    amr2 Active Member

    Messages:
    427
    I have found a parts unit :) I spent more than expected, but the project continues...
     
    souljay3 likes this.
  19. Jazzmuso

    Jazzmuso Active Member

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    149
    Location:
    Cape Town South Africa
    Glad to hear you are on the way again. That amplifier looks a lot like an M2 on the inside.
     
  20. amr2

    amr2 Active Member

    Messages:
    427
    Thanks! Yes, it's very similar, but not identical.
     

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