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Thread: Capacitor replacement, Phoenix Gold MS-2125, Rev C-1

  1. #1
    Founding Member finbar's Avatar
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    Capacitor replacement, Phoenix Gold MS-2125, Rev C-1

    Re-capping an amp is something new to me and I liked it.:gr_grin:

    You will need......
    A soldering iron
    Solder
    Hand tools
    I recommend Chip Quik
    New caps
    A kitchen table, wife away in NYC for a couple of days or there will be questions!
    The rest of it will unfold as I go.

    PG amps of this vintage are prone to filter capacitor leakage and catastrophic failure. I wanted to get to this one before the catastrophic part.



    Looks OK on the inside and sounds good playing too.



    I removed the board from the amp, pics of, so I could remember what goes where later on.
    I de-soldered the filter caps using an iron & solder sucker.
    The cap legs were cut flush with the board.
    I applied chip quik flux and solder.
    Working one cap at a time I melted the solder, which stays molten longer than regular solder, and wiggled the cap loose.
    I checked for continuity of the vias, they were good.
    I cleaned up the solder pads with the iron, sucker and solder wick.

    De-capped board.



    Some cap spooge got on the board.



    After a little cleanup with 99% isopropyl alcohol the stains from the cap's electrolyte can be seen. The good news is the traces and vias have continuity.



    With the thru holes clear I installed the new caps, bending their legs on the back of the board to hold them in place.
    I trimmed the excess with a side cutter and soldered at will.

    Here they are soldered in, time to nip off the stray whiskers.



    The lights are on and the music plays.



    A couple of discoveries,
    Chip Quik is your friend...YouTube - SMD Removal using a Chip Quik kit
    Grinding the side cutters so they cut flush really helps. Grind outside, away from speaker magnets or anything else longing to suck up magnetic dust.





    Oh and tidy up the kitchen table before she gets back.......



    Enjoy.
    "Being Irish, he had an abiding sense of tragedy, which sustained him through temporary periods of joy.'
    William Butler Yeats

  2. #2
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    Nice!! Define this catastrophic failure please...

    I have an MPS2240 that my son was using to run his subs. It stopped working and went into protect mode. Is this what you are referring to?

  3. #3
    Big Daddy Chad's Avatar
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    Quote Originally Posted by cubdenno View Post
    Nice!! Define this catastrophic failure please...

    Th caps can essplode, imagine setting off an enormous party popper filled with stinky oil inside your amp. This often times takes out the power supply. And sometimes induces fire. The caps can also leak and ruin the PCB.

  4. #4
    Founding Member finbar's Avatar
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    ^^^ what Chad said.
    The caps are at +12V in the car even when the amp is off and the car is parked. You could come back to a smoky ride. Electrolytic capacitors have a finite life-span.

    The electrolyte is acidic and can eat through traces leading to a shutdown.
    Last edited by finbar; 12-10-2010 at 12:18 PM. Reason: mo info
    "Being Irish, he had an abiding sense of tragedy, which sustained him through temporary periods of joy.'
    William Butler Yeats

  5. #5
    Big Daddy Chad's Avatar
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    the smaller diameter ones are at +12 all the time, the larger rail caps are not under voltage till the supply ramps up.

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    Thanks guys!! hey Finbar, let me know when your wife heads out again. Will send my amp to you for cap replacement!! He he

  7. #7
    Big Daddy Chad's Avatar
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    If I had a mirror wall like that in my kitchen I would totally PWNT my cats with a laser pointer.

  8. #8
    Founding Member finbar's Avatar
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    Quote Originally Posted by cubdenno View Post
    Thanks guys!! hey Finbar, let me know when your wife heads out again. Will send my amp to you for cap replacement!! He he
    Yer on!
    A bit of thinking fluid and you too can be a cap changer outer.

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    Quote Originally Posted by Chad View Post
    If I had a mirror wall like that in my kitchen I would totally PWNT my cats with a laser pointer.
    "Being Irish, he had an abiding sense of tragedy, which sustained him through temporary periods of joy.'
    William Butler Yeats

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