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Title: Blowing 2 amp Fuse, Faulty Power Tranny? Post by: NitPicker on March 29, 2012, 10:05:33 AM My 50w, built by Nik June 2008 is blowing the 2amp fuse. Its a 240v model. I have pulled all the tubes and it still blows so it may be the power tranny. To test if its the power tranny do I disconect ALL the wires off the tranny except the 240v wall voltage and star earth. The posts I could find didnt actually say if all/which wires had to be disconnected. Thanks for any help, AJ
Title: Re: Blowing 2 amp Fuse, Faulty Power Tranny? Post by: erwin_ve on March 29, 2012, 10:38:47 AM With no power: disconnect all secondaries and measure the 345-0 and the 0-345 taps in Ohms.
Both sides should be the same; if you got around 20 Ohm difference the PT is gone. They should measure around 40-50 Ohms per side. When measuring both 345 taps it should be around 90-100 Ohm. Title: Re: Blowing 2 amp Fuse, Faulty Power Tranny? Post by: NitPicker on March 30, 2012, 07:27:56 AM With no power: disconnect all secondaries and measure the 345-0 and the 0-345 taps in Ohms. There is a heavy paper? cover with the various voltages marked on it covering the bottom of the transformer. Is there any easy way to remove this without damaging it or do I just cut through it and peel it back. The soldered terminals seem to be well under the cover. I dont want to destroy or damage it if there is an easy way to remove it. Thanks AJBoth sides should be the same; if you got around 20 Ohm difference the PT is gone. They should measure around 40-50 Ohms per side. When measuring both 345 taps it should be around 90-100 Ohm. Title: Re: Blowing 2 amp Fuse, Faulty Power Tranny? Post by: erwin_ve on March 30, 2012, 08:21:02 AM With no power: disconnect all secondaries and measure the 345-0 and the 0-345 taps in Ohms. There is a heavy paper? cover with the various voltages marked on it covering the bottom of the transformer. Is there any easy way to remove this without damaging it or do I just cut through it and peel it back. The soldered terminals seem to be well under the cover. I dont want to destroy or damage it if there is an easy way to remove it. Thanks AJBoth sides should be the same; if you got around 20 Ohm difference the PT is gone. They should measure around 40-50 Ohms per side. When measuring both 345 taps it should be around 90-100 Ohm. If this too difficult: consult a local tech. |