Brody Radford wrote: > > Well as far as I know it is an Australian clone (of perhaps a Tektronix but > I'm not sure). I'm up for the challenge of fixing it, and need it any way > since I'm a student. > I'll test the transformer outputs, and my use a step down transformer > connected to the high v outputs to test them. I'm pretty sure that�s the > problem, I don't want to put my head and ear too close to the circuit when > its on but I'm sure the sound comes from the transformer (EHF or inverter > transformer? Not named in diagram) There is no smoke and as far as I can > tell it doesn't get overly hot. You're exactly right though Declan, I have > never fixed a scope or power supply. All I'm going by is my superficial > knowledge of electronic circuits to locate and solve the prob by looking at > the schematic. Like I said it would help if I had a scope to fix it ;) > Thanks for inputs and I'll try your suggestions. > > Brody
Hi Brody, since you have the diagram, you should be able to locate the problem. Hoever, I don't think that testing the HV with a step-down transformer is a good idea. This transformer would need a kV rating on the primary in order to test your HV. It would be better to build a resistive voltage divider. Normal metal film resistors and most carbon film ressitors are rated for 500-1000V, if you take ten of those in series and glue them into a plastic tube with one of those cheap thermal glue guns, it will make a nice 10:1 high voltage divider. One other point from own experience: did you have a look at the solder joints underneath the HV transformer? I have seen more than one monitor with one of the joints burnt off or loose, giving rise to a buzzing noise.... You say there is no smoke. Is there a smell of ozone when running it and the transformer is buzzing? If not, you might not have arcing either.... Uwe. -- Author: Uwe Zimmermann 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).
