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  1. B

    Stage Line 500W amp repair project

    Being stupid you already said collector and emitter
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    Stage Line 500W amp repair project

    Hi bob thanks for your reply but I am unsure I know what you mean about the diode check range? I assume PNP is positive neutral positive and visa versa ??
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    Stage Line 500W amp repair project

    Does the letters B C and E stand for bass collector and earth?
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    Stage Line 500W amp repair project

    Ok tested the first transistor with the meter set to 20k and results are Black probe on point B Red probe on point E Reading is 5.84 Red probe on point C Black probe on point B Reading 5.55 No reading from any other combinations This is the multi meter it am using Just bought it from...
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    Stage Line 500W amp repair project

    I also have the heatsink almost dismantled , and have the output transistors all de soldered, how should I test them ? Thanks for all your help so far, this is a really interesting project for me.
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    Stage Line 500W amp repair project

    ok khrisblueNZ, Is this correct ? whats my next move? Was I right with 2 LED's polarity reversed from each other ?
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    Stage Line 500W amp repair project

    after rectifying my earlier mistake and replacing 5 fuses ( 4 on the board and the main one in the back of the case) i now have both left and right fault led's lit, and it blows all 4 fuses on the board, only tryed this once! i now have fault left and righ led lit !! under side of moroco...
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    Stage Line 500W amp repair project

    Just looked back on some of the pictures I took before I removed the board, and yes my fault I have put the live and negative the wrong way round (doh!!!) will put them right later tonight and see what happens, going to have to stock up on fuses I think, will upload some more photos for everyone...
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    Stage Line 500W amp repair project

    Just had the board out and resoldered what I thought were some dry joints, I haven't accidentally joined more than one point at a time, as in soldered to together that are not supposed to be, however I also replaced a missing screw that holds the board to the chassis, now I have blown 4 fuses as...
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    Stage Line 500W amp repair project

    ok just to let everyone know there are no blown fuses, that was the first thing i checked, as for dry joints i will have a close look over the weekend, also the guy i got the amp off bought a newer stageline amp (higher power) and the fan is on instantly, also with it being the left channel, am...
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    Stage Line 500W amp repair project

    also dont know if its of any help but noticed the cooling fan does not spin up when the unit is switched on? or does it only come on when it starts to get hot??
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    Stage Line 500W amp repair project

    fantastic!! and thank you for all the replys, yes the only thing i can visibly see is the resistor leg in pick 2 post#4 that has discoloured, i have has the board out and could not see anything obvious, ie burned out tracks, i will take it out again and have a closer inspection and post my...
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    Stage Line 500W amp repair project

    looking inside the amp with it switched on, the fault left led is lit, but the burned resistor seems to be on the right side, the plugs where you connect the speaker cables are left and right chanel as your looking at the photo, right so where do i start,?? thanks :-)
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    Stage Line 500W amp repair project

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    Stage Line 500W amp repair project

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    Stage Line 500W amp repair project

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    Stage Line 500W amp repair project

    hi dave, done nothing yes this was my first stop, will get them pix umloaded asap
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    Stage Line 500W amp repair project

    hi all, just been given a stageline 500w power amp, the story is this, the amp used to belong to me a few years ago along with a nice set of warrior speakers, they were used regularly with no problems aprt from the volume knobs (potentiometers) if i spelt that correctly being a bit scratchy...
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