[HECnet] VS4000/60 power supply dead... or not?

[Hans Vlems]

The grey things are resistors, 15 kOhms and 20 kOhms from what i can see on the picture. The 10% indicates the margin of error (so the 20 k one may actually be 18--22 kOhms). They are rated at 2 Watts. They may be defect, I've seen these things break down in Teac tape decks.


Verzonden vanaf mijn BlackBerry 10-smartphone.
  Origineel bericht  
Van: Jordi Guillaumes i Pons
Verzonden: maandag 15 februari 2016 19:53
Aan: HECnet Mailing List
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] VS4000/60 power supply dead... or not?

>> 
>> Some things never change.. ;)
>> 
> 
> ATX PSUs are far more abundant. ;)


Well, I have replaced the fuse and it is still dead. I have double checked the PCB and I have found a part that seems to be charred.

http://i.imgur.com/4hpUKpb.jpg

I’m not sure what the big grey things are. I’d guess those are some kind of resistors (labeled 2W10% 15K), but I have not seen something like that before. If so, the one horizontally in the pic seems to be burnt. The PCB is charred underneath it, and no current goes thru it accordint to my multimeter.
‎
On the other hand, I will have a stupid trouble: I can’t remove the PCB from the chassis, because one of the TORX screws is… well… screwed. The turndriver does not fix onto its head. I guess I’ll have to do a compraption taking a derivation from the (suposed) resistor out of the PCB. Unless there is any kind of magic for a broken screw head (and no, I can’t vandalize this one).