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help studiomaster powerhouse 300 amp fault

Discussion in 'Troubleshooting and Repair' started by theresalwaysthehammer, Nov 5, 2010.

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  1. theresalwaysthehammer


    Nov 5, 2010
    I need help please

    I've got no accurate schematic to work from only the studiomaster diamond 700D 900E schematic which is very similar except for the component numbers

    It came with one stereo channel out so I tested the power transistors on that side and found two of them short/c base&emit to collector MJ15003/4 and replaced them
    I also found something wrong with the next transistor back TR12 so I looked it up online

    its SM2184B in TO-220 case

    Totally confused is it a pnp transistor? or is it possibly a triac? The one from the other side (working) read funny on the meter but this one is short on all pins
    Also the relay had melted shut I've replaced that too

    I used a transistor rated above the one rated above (sm2184 in the only page on the internet seme) and popped another set of mj's just one side still have a set left also the relay showed signs of getting (abit) really hot
    This is without speakers hooked up

    I don’t want to waste another set of mj15s if I can help it

    so any help much appreciated


    going to test everything else right back to the mains plug......
    which I've done now and not found any problems
    I really need the 8-2 300b schematic so I can identifie this sm2184b seme thing
    Last edited: Nov 7, 2010
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