At 2002-12-12 22:23 -0800, Brody Radford wrote: >2) I just bought a faulty oscilliscope (model bwd 540 if that helps - quite old...) >which has a problem in the powersupply area, but control panel lights still come on >so I'm quessing its not the main transformer. There's a smaller transformer (say >4x4x4 cm) which as far as I can tell is the source of a buzzing/spluttering sound >when powered up. It outputs several different voltages, 2 or 3 are around 15 to 30v, >one is 4.5Kv and one is ~1.5Kv (fortunately I have a service manual for it). There >was a 2200u, 25v cap in the rectification part of the low voltage outputs which has >some crusty blue stuff around the terminals and had a very low resitance (something >like 150 or 200 ohms instead of the 500-odd Kohm of the surrounding caps). I replaced >this but to no avail, so my conclusion is thus : the cap dried up and caused a short >in a particular transformer coil which >took out one or two of the others, perhaps one of the high voltage ones and this is >now arcing. So what can I do to fix it from here? Does it sound like I've tracked >down the problem correctly? I really need an oscilliscope to fix it...
If it's indeed the transformer, there are companies that will wind customer defined transformers. The core is probably still good, so they can use that. Perhaps the lacquer of the insulation of the wires became brittle? They should be able to unwind the old wires and measure their length. Perhaps you can call such a company and ask them for advice? Greetings, Jaap -- Chip Directory -- http://www.chipdir.biz/ -- http://www.chipdir.info/ -- http://www.chipdir.net/ -- http://www.chipdir.nl/ -- http://www.chipdir.org/ -- And about 30 other mirror sites world-wide. -- -- To subscribe to a free 'chip issues, questions and answers' -- mailing list, send a message to [EMAIL PROTECTED] with -- in the body 'subscribe chipdir-L'. About 500 experts are -- willing to think with you about electronics problems etc. -- Author: Jaap van Ganswijk INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
