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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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Scored lines on speaker voice coil former
Due to dirt in use or at manufacture?
Carlsboro 10 inch ,open circuit, so burrowed in to explore. On the phenolic cylinder that is the former for the voice coil . 4 pairs of scored ines( stand out white against the amber colour of the phenolic). Each pair about 6 to 7mm apart and arranged pairwise diametrically. I suspect 4 pieces of sharp edged metal shim used in the original cone setting and scored on removal. All the lines go axially , fully from one end to the other , so if made in use would require the diaphragm (spider?) being driven 10 mm into the magnet housing. Apart from the nearly symetrical distribution of the lines. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
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