From: cd@notformail.com   
      
   On Sun, 23 Oct 2022 14:13:30 -0700 (PDT), whit3rd    
   wrote:   
      
   >On Saturday, October 22, 2022 at 7:26:11 AM UTC-7, Cursitor Doom wrote:   
   >> Hi all,   
   >>   
   >> So my main analogue scope, a Tek 2465A, has gone faulty. Keeps blowing   
   >> main fuses (the 2A one on the rear panel). I opened the case and found   
   >> two RIFA caps that had obviously blown, so replaced them, but it's   
   >> still blowing fuses. I can't be 100% certain, but I'm pretty sure   
   >> there's a fault with the PSU board as I get the briefest whiff of   
   >> burning from that area each time I put a new fuse in and power up.   
   >   
   >First thing to check is the rectifier; that diode bridge can fail, and   
   >apply AC to the filter capacitors, and... that'll take out the fuse.   
   >Not sure why the RIFA capa goes, though; maybe just a power surge some   
   >time last week?   
   >   
   >There seem to be some surge-suppressors (gas discharge?) in the diagram, they   
   might   
   >have failed short in a surge..   
      
   Yes, they're each showing about 70k ohms, so can't be responsible.   
      
   One thing I forgot to mention in my first post was that a wire had   
   come adrift from the cooling fan's supply (poor factory soldering   
   clearly) so this unit had been running for an unknown length of time   
   with no fan. Not sure if that's relevant to the fault here, but it   
   certainly *could* be....   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)