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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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Solenoid - shorted turns.
Not where I've ever seen one before, the trigger actuator for power take off
in an audio cassette deck. Obviously overheating but no obvious burning , probably buried. Measures 4.1 ohm but by calculation for 38swg wire and possible range of inner core diameter and layup packing factor between regular Pi/4 and stagered layup optimum of (sq root 3)/2 comes out to be range 16 to 43 ohm. So will have to countoff/rewind. 38 swg enamelled Cu wire data 0.018 sq mm area and .776 ohm / m I was exploring use of polyswitch / reset fuse MF-R110 , 5mm 1.1 amp hold current in its PTC thermal properties to lay on the outside added in series as a protector. In olden days of bulky VCRs there was 2 coils , the pull-in and the hold, to avoid heat build up. Anyway data for this particular type of small polyswitch , as I can see being useful in other non mains fuse situations. 20 to 42 deg C, 0.2 ohm 66 deg , .3 92 , .4 100, .45 108 , .5 118 , .7 122, 1 123, 2.5 126 deg C, 11 ohms then goes shooting off |
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