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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Ashdown MAG 300
Blows mains fuses. Ashdown supplied replacement fuses to the owner, better
than FOAD I suppose. Survives long enough for the meter lamp to come on half a second. Nothing found obviously suspect in ps or pa probing around cold and inspection. Not looked at prea yet. Will power up on variac tomorrow with lower rated fuses and prea disconnected initially. Bad internal AC supply fuse holder contacts , arcing burn marks on the fuse barrels. Both are 5 amp rating but neither blown or showing stress on the fusewire. The mains primary of the torroid measures 6 ohm which seems reasonable for 300W amp and no other filter items . Anyone ever found bad ac rail fuse contacts leading to mains fuse rupture ? perhaps inductive back?/forward? emf kicks, surely not. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
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