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Hi !! Thanx for the replies ... infact this amp is in my workbench in the last 30 days ... I've tried all mods and tips from the Marshall JCM2000 TSL repair page and none worked at all. So I decided to built my own Bias board off the mainboard ... and it doesn't worked either. So I suggested to...
José Pedro you also need to check the ground connection between both jacks (in bold black) and the wiring between the jack switching (tip to tip - grey wire on the schematic #1). Worked fine on my amp !!
Thanks The Creator for sharing it !! Works great !!
Updating: for any reason this mod...