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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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On Sat, 20 Feb 2016 09:10:13 -0500, legg wrote:
On Sat, 20 Feb 2016 12:55:19 -0000 (UTC), Cursitor Doom wrote: On Sat, 20 Feb 2016 01:14:09 -0500, legg wrote: Recheck pin function before jumping to conclusions. Right; now re-checked. DC measurments proved (unsurprisingly) too close together so I re-tested using 100khz instead. These are the impedances WRT ground of the output taps of the long winding in the order they actually come out of the transformer: GND, 0.17ohms, 0.17ohms, 0.26ohms, 0.28ohms, 3.7ohms, 3.8ohms. So this doesn't seem to tally up with the schematic. Or does it? I need a pint of strong coffee to kick-start my head on this one. :-/ Anyway, later... If the transformer is removed from the board, which seems to be the case, you can probe the PCB for continuity between known component leads/schematic nodes and empty PCB transformer pin lands. Using a logical physical numbering scheme (if one is not allready present on the actual transformer body), you can assign numbers to the board and the schematic, for reference. RL I was really struggling trying to match up the pins to their particular outputs; fortunately JC has has posted the pin-outs for this transformer and saved me some brain cells (I can't afford to lose any more). Seems the voltages I'm getting are not far off what they should be after all. |
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