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Mark1960 · 11th Apr 2022, 8:11 pm

Maybe check that the mains plug has a reasonable fuse, not 13 amp, it might reduce the size of a bang. I wonder if that filter had let out some smoke in the past so someone bypassed it, did you check it for shorts and opens?

11th Apr 2022, 8:11 pm	#18
Mark1960 Octode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 1,294	Re: Commodore CBM 4040. Maybe check that the mains plug has a reasonable fuse, not 13 amp, it might reduce the size of a bang. I wonder if that filter had let out some smoke in the past so someone bypassed it, did you check it for shorts and opens?