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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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Mackie SRM 450 powered speaker
How to separate the 2 main body parts.
I have to get to the speaker and have so far only removed one screw. They are 2 inch long, twin start, that bite too much in the bulk of the plastic. I'm aware of this situation before, in other kit, and the screw shank snapping due to the excess torque required to undo, not just the first turn but perhaps half the thread length. Previously I've heated the head of the screws with a soldering iron to partially soften the plastic , then when extracted, drill out the plastic a little. But these are recessed 8 inches down. So is it a matter of the shaft of a long philips screw driver with the plastic handle removed , replaced with something metalic and a soldering iron heater slid over the shaft to heat the recessed screw. Anyone tried extending an impact driver to break the binding ? Any other ideas ? |
#2
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Mackie SRM 450 powered speaker
N Cook wrote in message
... How to separate the 2 main body parts. I have to get to the speaker and have so far only removed one screw. They are 2 inch long, twin start, that bite too much in the bulk of the plastic. I'm aware of this situation before, in other kit, and the screw shank snapping due to the excess torque required to undo, not just the first turn but perhaps half the thread length. Previously I've heated the head of the screws with a soldering iron to partially soften the plastic , then when extracted, drill out the plastic a little. But these are recessed 8 inches down. So is it a matter of the shaft of a long philips screw driver with the plastic handle removed , replaced with something metalic and a soldering iron heater slid over the shaft to heat the recessed screw. Anyone tried extending an impact driver to break the binding ? Any other ideas ? whoops just as i'd found a soldering iron heater to slide over a long philips I decided to see if there was access via the front grill, bolts without spring washers so surprising none were actually loose, accessible from the front. No apparent reason for failure of the speaker and cold tests of the driver trannies look ok, not shorted to DC rails. Was working normally , not overdriven according to the owner . Then next power up there was horn output but no bass driver, just as though a wire had come loose, no big thump or noise. |
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