Hey Guys,

Thanks for the replies, ill be honest, i should have tried the most basic fix first, replace the fuse with the right one, have since put the MP4 back together and its been singing beautifully !!

Cheers

--- In korg_mono-poly@yahoogroups.com , "biggiemoog" <daniel.eden@...> wrote:
>
> About a month ago my Mp4 died half way through playing an arp in poly mode. It completely shut off, didnt make a bang and wouldnt turn back on. I opened her up the other day and found that the 2x 250v 1A fuses on the power supply had blown. To test if i could get it back on i replaced these with 3.15A just for a second to turn it on, it did come on but then i fried VR19 Semi-fixed Resistor (104J), it was quite apparent, smoke only came from the filter board and when i dismantled it you can see quite easy that its burnt out. Prob not the best of idea to put a 3.15A fuse in but im an impatient prick so i paid the price for that. All that aside, im trying the following ;
>
> Replace the burnt resistor (im 99% sure its a 100KOhm, i checked the service manual and according to the VR18, the resistor right next to VR19, on the schematics, it says "100K").
>
> Replace the fuses with 1A 250V, i have these but i think that they will blow again straight away.
>
> Replace SSM2044 on the filter board, i have come to this conclusion (correct me if im wrong) that there is an issue with the the filter chip, possibly faulty, that is causing the short along the trace to the semi-fixed resistor.
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> I would also like to say thanks alot for having me on board here, im stoked to be able to post my drama's with people of like minded nature. I hope there is someone that can point me the right way.
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> My Mp4 is Japanese but i use a step up transformer to have it run here in Australia. My last question before i finish the post is, is it possible to have a Australian PSU put into the MP4 to eliminate the Step up transformer
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> Many thanks
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> Daniel
>