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Naim CD3 repair or upgrade?

Discussion in 'd.i.y.' started by say it as it is, Mar 20, 2020.

  1. MJS

    MJS Technical Tinkerer

    Yes, we can now modify a Hicap and CD player to use as a dual-polarity power supply for the CDI, CD2 and CD3.
     
    djftw, Dowser and torstoi like this.
  2. westsea

    westsea Retirement present

    True, but to my mind you need to fix it as a first priority. I do many repairs, but as a mechanical engineer, CD players are not a good place to start....but then you might have a different skill set, and different priorities:)
     
  3. say it as it is

    say it as it is pfm Member

    Hi well as a mechanical engineer myself I get your point hence when funds allow I will price repairs but conscious of what a working cd3 sells for against what it will cost to repair
     
  4. westsea

    westsea Retirement present

    Ah well I understand, been there in my younger day, which seems a hell of a long time ago, hope it works out for you
    Cheers
     
  5. say it as it is

    say it as it is pfm Member

    well not had a go at the CD3 yet but stripped the donor player and fixed numerous faults and got it working so definitely got a working laser and mech now. Stripped it out and see if its needed.

    might get brave and take the cover off the CD3 if I get the time.
     
  6. say it as it is

    say it as it is pfm Member

    ok took the cover off the CD3 cant see anything obvious any clues as to what I should be looking for all I can see is slight marking on one of the small blue capacitors in the first photo ( if I have managed to get photos to work)

    as said I am far from an electronics expert just looking for any obvious clues

    https://flic.kr/p/2iRrBo3

    https://flic.kr/p/2iRrKLf

    https://flic.kr/p/2iRq4DY
     
  7. Dowser

    Dowser Learning to bodge again..

    Wow - full of electrolytics rather than tants!

    It plays disc, but no sound, right? Download 1541 datasheet and check +5 / —5 / -15 Volt supplies to it. If that OK, check for +/- supply voltages to the opamps
     
    torstoi likes this.
  8. say it as it is

    say it as it is pfm Member

    Saga continues been with a local specialist for a while now so he has - Replaced Electrolytic + Tantallum Capacitors in Power Regulator, Audio Output + Muting Circuits. Fault still evident. Suspect / Possible D/A Converter IC faulty.
    so looks like transport was indeed ok.
    I take it TDA 1541 as fitted to this player are impossible to find?
    time to scrap it or hope yet?
     
  9. djftw

    djftw Heterodox Member

    You can source them on eBay relatively easily, how worthwhile it is is up to you! If you want to stick with CD there are some cracking players for relatively little money on the 2nd hand market, and many other options these days.
     
  10. mega lord

    mega lord Centre tapped

    Depending on cost, it would be a massive shame to scrap this player. Good luck sourcing a chip if that is the way you go
     
  11. onlyconnect

    onlyconnect pfm Member

    Depends I suppose on "as fitted to this player." There seem to be plenty of TDA 1541 on eBay or you could buy an old TDA 1541 CD player of lesser quality and pull the chip from there?

    https://www.ebay.co.uk/itm/TDA1541-...444698&hash=item3b2f97e6b2:g:NqUAAOSwIO9ca~y4

    (no idea if these would work but might?)

    Tim
     
  12. MJS

    MJS Technical Tinkerer

  13. MJS

    MJS Technical Tinkerer

    Before changing the DAC do make sure that you have bit clock signals, the bit stream from the digital filter and the L/R word select signals. Those are pins 2, 3 and 1 respectively.
     
  14. say it as it is

    say it as it is pfm Member

    I don't have it is still with the local guy he is pretty sure the dac is fried. In short term could a digital out be fitted to use an external dac as an sure it would make a fine transport. Don't know if possible I'd the dac is damaged
     
  15. MJS

    MJS Technical Tinkerer

    Yes, page 17 of the SAA7220/B datasheet contains an example of how to implement a 75 ohm digital output.
     
  16. say it as it is

    say it as it is pfm Member

    Cheers do you have a link to where I can get the data sheet?

    Ps Mark do you guys hold spares like TDA 1541 S1?
     
  17. MJS

    MJS Technical Tinkerer

    I have no DACs - believe me I'd love to find a reputable source of the good ones. I do have some of 4x digtal filter chip.
     
  18. Dowser

    Dowser Learning to bodge again..

    I still have stock of 5 S1s (but 1 promised to a member on DIY Audio if he ever fixes his...he‘s been working on it over a year, worse than me repairing my CDI :)), so guess I can let 1 more go. But check prices online first, then make me an offer on a genuine one :) I cleaned out Studer (I think) of their spare stock a few years back - they were selling standard 1541s and S1s at same price :)

    Oh, and try google for the data sheet...
     
  19. martin clark

    martin clark pinko bodger

    NB to add to the above - it is always the SAA7220/B version you want... explication from archives..:

    [​IMG]
     
    say it as it is and MJS like this.
  20. Chops54

    Chops54 pfm Member

    I modified my CD3 some years. The Arcam A5 uses the same chipset and has a digital output so I copied it straight off that circuit diagram.

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
    torstoi and martin clark like this.

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