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Tutorial: "Deep Cleaning" An Amplifier

Discussion in 'DIY' started by Machineghost, Oct 22, 2009.

  1. Artie

    Artie AK Subscriber Subscriber

    Messages:
    1,821
    Location:
    Jax, Fl
    The only trouble with this is, many units come with an "oily" sooty grime inside them that wouldn't just brush off. A deep cleaning is necessary. My Sony amp just came this way. I don't know where this stuff comes from. Maybe using the amp in a kitchen? :scratch2:

    I'll post my Sony TA-2650 "deep clean" as soon as she's finished. :thmbsp:

    Thanks for the great tutorial.

    Artie
     

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  2. TLCW

    TLCW Active Member

    Messages:
    154
    Location:
    Hong Kong
    Great post. I heard the factory PCB has a 'coating' for protection (?).
    What is it ? In audio restoration, littel is mentioned regarding this. Anyone?
     
  3. BinaryMike

    BinaryMike Pelagic EE Subscriber

    Modern PCBs normally have the copper terminal pads plated with other metals in order to resist corrosion and enhance solderability, and the rest of the board, including all of the copper tracks, is coated with polymer solder resist. This process is called SMOBC for "solder mask over bare copper." The substrate is a fiberglass-epoxy composite material that does absorb and retain a small amount of moisture, but its effects are generally insignificant below 100MHz. Oddly, the cheap paper-epoxy material that's often seen in Asian audio gear is superior in this respect.
     
  4. jmartinbaugh

    jmartinbaugh New Member

    Messages:
    1
    Help living in the UK i cant find Kleen Green Biodegradable Detergent has anybody got an idea of what I could use. I dont want to ruin a Pioneer A400 that I have found. Great Tutorial Many Thanks.
     
  5. TLCW

    TLCW Active Member

    Messages:
    154
    Location:
    Hong Kong
    BinaryMike:
    Thank for the epoxy composite info.
    BTW. Is it true some use lacquer (clear paint) to coat after washing in restoration ?
     
  6. jon56

    jon56 Active Member

    Messages:
    101
    Location:
    Palm Springs CA.
    There is always a paranoid treehugger in the mix spreading doom and gloom when all you have to use is your God given COMMON SENSE!!! Jon 56:thmbsp::thmbsp:
     

     

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  7. jambre

    jambre New Member

    Messages:
    6
    Cleaning Boards with Lemon Juice?

    Thanks for taking the time to post this-I'm a noob here with some electronics background from my Navy time, and I know enough to know that I've a lot to learn-

    Anyway,for my first restoration project, I pulled out my old 1984 vintage Yamaha R-50 receiver from the cellar, found what looked like dried mud(?) residue on the case and interior from what may have been an old plumbing leak-I found the service manual on Ebay(I'll scan and post later), but I googled "Cleaning Circuit Boards" and found this on ehow.com-

    http://www.ehow.com/how_6200115_clean-circuit-boards-lemon-juice.html

    Any comments from those who've been there/done that?

    Thanks,

    Jim
     
  8. Machineghost

    Machineghost Ghost in the machine

    Messages:
    949
    Location:
    South Africa
    It is my pleasure.

    Try finding any type of "domestic use" engine degreaser. But if that is not obtainable then you can use something like "Arial" washing powder (then the amp will have a nice flowery fragrance ;-)
     
  9. Machineghost

    Machineghost Ghost in the machine

    Messages:
    949
    Location:
    South Africa
    Oh no no no! I would not recommend that. Lemon juice is an acid that corrodes copper and would be very bad for thin PCB tracks.

    Just use some good thin liquid type degreaser/detergent.
     
  10. guest111

    guest111 Active Member

    Messages:
    267
    Fantastic tutorial! Thanks for sharing.
     
  11. Machineghost

    Machineghost Ghost in the machine

    Messages:
    949
    Location:
    South Africa
    My biggest wash stunt was a mixing desk with 34 audio channel modules! Nearly broke my back... but the desk looked just marvellous afterwards!
     

     

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  12. Machineghost

    Machineghost Ghost in the machine

    Messages:
    949
    Location:
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    A pleasure :)

    And yet today I find myself completely without a hi-fi system... :tears: had to sell because of a few reasons...
     
  13. hybridtech

    hybridtech Active Member

    Messages:
    116
    Location:
    Auckland, New Zealand
    Simple Green concentrated All-Purpose Cleaner, is a similar product http://simplegreen.com/ & go to the Global Partners tab & you should be able to find the product locally.
    I've used it on a Pioneer integrated with stunning results (thanks Machineghost). Next up are an A & R Cambridge A60, & Nad 3020i.
    Cheers
    Tony
     
  14. audiodon

    audiodon Addicted Member

    Messages:
    9,294
    Location:
    RIP 1957-2018
    Great thread machineghost. I'm going to use this one for any PCB based amplifier cleaning I do.
    Thanks for your time and effort and obvious communications skills.
     
  15. Machineghost

    Machineghost Ghost in the machine

    Messages:
    949
    Location:
    South Africa
    Thank you - a pleasure indeed :)
     
  16. Machineghost

    Machineghost Ghost in the machine

    Messages:
    949
    Location:
    South Africa
    Hi there!

    Never soak the PCB and components. Work swiftly and work the detergent into the pots and give them each a quick few turns to help clean the track. Then rinse the PCB properly and dry ASAP. Do not bother with a pre-wash of alcohol and destilled water (you will be wasting your own time and money). Flux can only really be removed with benzine and/or thinners.
     

     

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  17. Machineghost

    Machineghost Ghost in the machine

    Messages:
    949
    Location:
    South Africa
    If you use a thick liquid type detergent then it would only be natural to wet the PCB before-hand with some water to make it spread a bit easier. But the type of detergent I recommend is something thin like KLEEN GREEN by Wynns.
     
  18. Machineghost

    Machineghost Ghost in the machine

    Messages:
    949
    Location:
    South Africa
    I have done a Yamaha DSP series 5.1 amplifier today... came out good.

    [​IMG]

    AFTER

    [​IMG]

    Came out nice and clean and works 100%. Had some nasty crap inside which caused it to cut out.
     
  19. doctorolds

    doctorolds AK Subscriber Subscriber

    Messages:
    1,575
    Location:
    AR
    That looks great. Thanks for the example. I have many that I am trying to perform the cleaning on but my other projects seem to push them to the back burner. I have been following this thread for quite some time now and I will post some pictures when I get a chance to get to one of them. :thmbsp:
     
  20. Binkman

    Binkman AK Subscriber Subscriber

    Messages:
    6,539
    Location:
    Chapel Hill, NC
    Well done article including pics. albeit the subject piece was certainly worthy of this cleaning lesson.

    If I may make a suggestion;
    Perhaps include a link to discharge capacitors. Just to be sure. A lot of 'later model vintage stuff has 5vcd circuits that don't like surprises.

    ------
    I have rarely come across a piece like the OP but worthy of cleaning or perhaps just one board occasionally that needs it. I do recommend hand cleaning turner boards regarding the OP directions. Anything with adjustable stuff on them. I mainly hand clean units assembled as they're usually not that bad. Plastic tweezers and I make up some 'mops' using small paper towels and good supply of Q-tips. doesn't take that long really. brush off any lint.

    For the OP's type work I use a dish liquid with a high surfactant quality, you know the brands that leave a shine on the dishes. Super dilute and along with the author I use a two long bristle brushes. soft nylon artist quality. rinse warm water and shake off the water. If no compressor or if in a hurry use a high volume blow dryer or just place a fan at it. Just like dishes you should get a nice sheen.

    Lots of fun..:D till your better half starts handing you her stuff to clean.
     

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