Question about Marshall MG 50

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I am trying to get inside my marshall MG30. I have removed all the screws and the top handle, put the back still won;t come off. What is the correct procedure for getting inside the amp.

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  • Nicolas Rowley Apr 09, 2011

    Just to clarify the problem with my Marshall MG30 (not MG50 as the FixYa heading says):

    I have removed the 4 long screws with washers from the top of the cabinet, and the carrying handle. I have also removed all the screws from the back panel.

    However, I cannot removed the back panel - it seems wedged tight and even moderate leverage won;t move it. And the gold panel at the front of the combo containing the pots and switches does not come out either. it moves slightly backwards if pushed.

    In other words, I can't seem to get at the amplifier OR the speaker.

    Would be very grateful for advice on how to get the gold panel/amplifier out and how to get the back off to see the speaker.

  • Nicolas Rowley Apr 09, 2011

    The amp is a MG30FX with a solid back panel. The speaker is not visible.

  • Nicolas Rowley Apr 09, 2011

    Sorry but there may a confusion here. It's a Marshall MG30FX. The back panel is solid and has nine screws. There are 4 large screws on the top. Even with the screws removed it is impossible to remove the back and impossible to move the gold front panel ...

  • Nicolas Rowley Apr 09, 2011

    Sorry man - I saw this on the web as well but it doesn't help. Even with the top screws removed, the chassis simply won't move forward or back. That's the point; even with the screws removed everything apparently immovable,. What exactly do you do or where do you push to get the chassis out? All best N

  • Nicolas Rowley Apr 10, 2011

    A mini jack broke off at the tip in the headphone mini jack socket. Can find no way of removing it without getting inside. Obviously no output from amp until get broken part out

  • Nicolas Rowley Apr 10, 2011

    yes that is a good trick but it's a mini jack socket and it's only the tip of the jack that has broken off so hard to get enough 'purchase' ro remove in this way. Have you got experience of disassembling an mg39fx? All best. N

  • Nicolas Rowley Apr 10, 2011

    Thanks man. Am working this aftenoon but will try when get back to studio later. All best. N

  • Nicolas Rowley Apr 10, 2011

    Unfortunately, none of the tips were able to get the lodged tip of the jack out, though they were great ideas. I managed to get the back off by screwing some oversize screws into some of the screw holes in the back and then pulling firmly and symmetrically. It was just VERY tightly wedged! Once inside, it is not difficult to remove the amplifier, and - as you said - there is no need to remove the knobs etc - the whole things comes out in one piece after removing three screws and and cable restraint for the power cable. Also very easy to replace without putting strain on any of the boards or connections. Unfortunately though, the headphone mini jack is a sealed unit with a resistor wired outside it, so have still not been able to remove the offending jack tip. Looks like have to replace the whole minijack assembly and wiring ...



    Really grateful for your help, and the really smart ideas.



    All best



    N

  • Nicolas Rowley Apr 10, 2011

    Supertech_11 made some really smart suggestions and really thought about the problem carefully. Many thanks!

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4 Answers

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  • Master
  • 1,591 Answers

First, I'd like to know why you are trying to open it, just in case you don't need to. No audio for instance sometimes is an issue that can actually be solved without opening up the head of the unit.
Give me an idea what the issue is, and I'll tell you if you even need to open it up.

Posted on Apr 10, 2011

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  • Norman Skinner
    Norman Skinner Apr 10, 2011

    Ok, here's a nice trick to try when something like that happens - get a drywall screw, and gently tap it into the broken off headphone jack shaft.
    while twisting the drywall screw clockwise, gently pull a little at a time until the headphone shaft is extracted.
    Much easier than complete disassembly, and if you make it big some day, comes in real handy when someone trips over your cord 15 minutes before a show!

  • Norman Skinner
    Norman Skinner Apr 10, 2011

    As I recall, that back panel should come off now (although it can stick), but to get the amp out, I think you still need to take the knobs off, and take off the retaining nuts on all the controls and 1/4 inch jacks before it slides out the back.
    I could be wrong, it's been a while since I've seen one of those, but that's what I remember at the moment.

  • Norman Skinner
    Norman Skinner Apr 10, 2011

    Trick for mini jack that tends to work (another road trick) is chances are there's still some plastic left in the jack tip....unbend a paperclip and heat it with a lighter.
    Quickly insert the paperclip into the jack tip being careful not to hit the walls of the amps jack itself.
    The paperclip will cool quickly and the plastic will bond to the paperclip, and you should be able to remove it fairly easily.
    Another trick is cut the end off a round toothpick and put a tiny drop of crazy glue on it, and fish the jack tip out that way.
    Honestly though, the hot paperclip / pin trick is less likely to cause damage to the amps jack.

  • Norman Skinner
    Norman Skinner Apr 10, 2011

    OOH, just had a thought, that might be one where the whole chassis comes out from the frame.
    place the unit on it's face now that all the screws are out, grab it at the sides, and shake it a bit and see if the chassis comes out the front.
    If not, flip it over and see if the whole chassis comes out the back.
    I think one of these 2 will be your solution if you don't manage to get a quick fix to work.
    In fact, try this BEFORE REMOVING any of the nuts around the controls or jacks in case one of the jacks falls inside the unit.

  • Norman Skinner
    Norman Skinner Apr 10, 2011

    Not a problem

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On my son's MG30, the input jack loosened and fell into the amp. I just opened it. To access everything inside, simply remove the 10 screws on the back panel, and then use a small (thin blade is key) flatblade screwdriver to pry off one side of the back panel. Piece of cake. There is no need to remove any of the top screws on the MG30. In fact, two of the screws on top do nothing at all and are just cosmetic.

Posted on Feb 13, 2016

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  • Master
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Refit the 2 middle large screws in the back they hold the amp onto the back then remove the 2 large screws in the top and take the whole back out backwards but hold on to the amp.

----------

First of all remove the back panel (four simple ph2 size screws). Then remove the four black ph2 size screws from the TOP of your amplifier (make sure you remove the correct screws, not those that holds the plastic protectors on the corners). Gently pull out the metal bracket but don't do it too hard, because you might damage the speaker cable. Now you can see all the inside components.

-----------

The input jack is soldered into a circuit board.So pull it carefully.Its easy to break.----------

Check out.Keep updated.Thanks.Helpmech.




Posted on Apr 09, 2011

  • raj somaiya Apr 09, 2011

    Ok, on Marshall MG30FX the back is not removable.the back panel is not removable, as it is part of the chassis. You must remove the entire chassis to get the the guts. The chassis is made from heavy tin sheeting, and the front & rear panels are folded-up, and the top is open except for a "lip" where the top screws hold it. The front is annodized in brushed gold, and the bottom & back are painted black. There are scews in the top that hold it in place, then the entire chassis slides out through the back of the cabinet.----------- this should help.thanks.Helpmech.

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  • Master
  • 635 Answers

If you notice on the top of the Marshall MG30 on either ends of the box there are 2 screws on each side with a ring washer. These are long screws which hold the amplifier. The amplifier above the speaker is suspended by this screws ( 4 in all ) . When you unscrew make sure the MG30 is lying on its face down or the Amplifier module will fall on the speaker when you unscrew the 4th screw.
Disconnect the speaker cable and gently pull out the amplifier.

Posted on Apr 09, 2011

  • 3 more comments 
  • Jacob Paul
    Jacob Paul Apr 09, 2011

    Remove the screws shown by the red circle. You have to view it from the top . Could not get a top view picture.4 screws in all.

  • Jacob Paul
    Jacob Paul Apr 09, 2011

    You don;t have to remove any other screws other than the one marked by the red 0.
    If you remove the other screws the box might fall apart !!

  • Jacob Paul
    Jacob Paul Apr 09, 2011

    Remove the screws marked by the red 0 in the picture. You have to view the MG30 from the top. Could not get a top view picture.If you unscrew any other screws the box my fall apart !!!.

  • Jacob Paul
    Jacob Paul Apr 09, 2011

    If you have a solid back model hold two knobs in the two ends of the front panel and pull out towards you. In the picture shown the Amp module has to be pushed from front to back. In your model from back to front.

  • Jacob Paul
    Jacob Paul Apr 09, 2011

    If its a MG30 there are 5 screws in all on top and not 4 as mentioned before

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