From: noone@nospam.com   
      
   On 9/4/2017 1:05 πμ, Anthony Stewart wrote:   
   > On Friday, 7 April 2017 10:53:18 UTC-4, Tzortzakakis Dimitrios  wrote:   
   >> A client left a faulty microwave oven at my friend's shop, I opened it   
   >> up and first thing I checked was, of course the HV fuse. It was open so   
   >> a new one. Nothing. Checked with my HV probe, at the transformator   
   >> secondary 3.5 kV(AC). At the magnetron nothing, no DC at all. Thought it   
   >> was the HV capacitor or the HV diode.Took them home, measured the   
   >> capacitor with my capacitance meter, 1 μF ok. Checked with my insulation   
   >> tester that can put up to 1000 volts, the diode, forward bias 0 Ω,   
   >> reverse bias >10 ΜΩ ok.Of course I didn't do anything as when you repair   
   >> household appliances you must be absolutely sure you'll repair it,   
   >> there's no room for experiments.Anyone with a brainwave? Again, the   
   >> trafo AC ok, DC nothing-something wrong with the magnetron?   
   >   
   > I fixed mine last week as the breaker kept tripping randomly and then the   
   fuse and it was the Cap shorted.   Check coil on hipot then magnetron tube for   
   leakage   
   >   
   so you think it would be hte capacitor??(that's a rhetorical question as   
   we gave the oven to the customer back as I wasn't sure). we found a new   
   capacitor but if that wasn't the case we would be left with a useless   
   capacitor and at least with 15 euros less. the fuse didn't blow again,   
   1.7 kV at the secondary, AC but no DC at the magnetron so it must have   
   been something at the voltage doubler.   
      
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