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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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Electromagnetic Lens Repair
Hi,
I am not very sure whether this is the best suited forum for my query but still I am sure this is not totally off-topic. So here goes.. Our 1990-purchased JEOL 6400 Scanning Electron Microscope recently developed an intermittent problem of black bands randomly appearing/sliding on its display. This was traced to an oscillating 24V supply powering, among other things, its objective lens control board and the objective lens itself. We found both ends of the objective lens (basically an elaborate coil of insulated copper wire wound on a conical steel(?) core) winding were at ~1 ohm to the the instrument chassis while the coil itself ~2ohm across. Disconnecting the lens has stopped the supply oscillation etc but ofcourse now there is no image! We are guessing that either the condensation due to the running cooling water or the heating due to lack of it has shorted the innermost layers of winding to the core. While we are still hunting for a spare, I would like to enquire people here for pointers on design & rewinding of electromagnetic lens coils. The winding looks specially designed - with number of turns decreasing in each layer in a particular fashion as one goes up the core. Will just replicating the winding - wire gauge & the turn pattern - bring it back to function? Any info/pointers highly appreciated! -- tia, Aniruddh Sarkar Research Associate Dept of Electrical Engg IIT Powai Mumbai, India |
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