From: cd@notformail.com   
      
   On Sat, 22 Oct 2022 08:57:06 -0700 (PDT), "ohg...@gmail.com"   
    wrote:   
      
   >On Saturday, October 22, 2022 at 10:26:11 AM UTC-4, 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. The   
   >> new fuse blows again before I get to see any smoke coming from   
   >> anywhere at all. I'm linking to a diagram of the PSU as I'm not   
   >> familiar with this circuit topology. If anyone can spot a component   
   >> here that could have gone low-resistance and might be a good candidate   
   >> for out-of-circuit testing, by all means let me know.   
   >> Thanks,   
   >>   
   >> CD.   
   >>   
   >>   
   >> https://disk.yandex.com/i/UhxATIy-6Y0LIA   
   >   
   >   
   >Did you do any resistance checks like for a shorted rectifier(s) or power   
   transistor like Q1050? FWIW, installing a new fuse and waiting for smoke is a   
   terrible idea.   
      
   Yes, well, my options are limited due the to the *dumb* design   
   implementation here. Plus I can't probe the test points or look for   
   voltage drops when the power supply is constantly interrupted within   
   miliseconds of switch-on. Looks like I'll have to break out my dim   
   bulb tester (if I can find it).   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)