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studiomaster powerhouse vision 8

Discussion in 'Troubleshooting and Repair' started by George, Aug 18, 2009.

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  1. George


    Aug 18, 2009
    Help desparatly required please,
    studiomaster vision 8. unit running fine for last 12months but suddenly developed loud sqeal both speaker cabs,only one guitar on at time.
    Master straight to off, lost display and squeal continued.powered down, left 10mins tried again same result !
    carried out detailed inspection, all pcbs ok visually, ribbon cables and pins ok,
    power souce good polarity ok, all fuses ok,
    transformer appears ok but I dont know what voltages at which pins I should be measurig?
    (Have suspected for some time fan not doing it's stuff so been using external fan just to be sure there was some positive cooling tacking place)
    any clues
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