Back in April, I wrote: > Robert Jarratt wrote: > > > > One of my DECserver 90M PSUs got dropped and stopped working as a result, > > possibly because it got pulled by the cable. That sounds like the kind of > > damage that might be repairable. I tried to open the enclosure and I found a > > hole under one of the labels, expecting it to be a screw hole, but it isn't. > > I am guessing you just have to pry the halves apart, but without knowing > > where the clips are inside it is easy just to break the thing. > > > > > > > > Does anyone know how you open these PSUs? > > > > As far as I recall, there are no clips - it is glued all the way around. > > Mine (actaully a 90TL, with H7082-AB PSU) failed too. Using a lot of > patience, > I pried it open without too much damage, fixed it (a capacitor in the startup > circuit IIRC) and glued it back together. The end result was only slightly > rough looking and would probably have been better with a more suitable glue. > The thing has a very Lego-like quality about it. > > It failed again some time later and I haven't had the enthusiasm to break it > open again since. >
I finally worked up the enthusiasm. It was easy to open this time as the glue I used to put it back together last time was not so good. While I was measuring voltages on the input side, out of the corner of my eye I noticed the LEDs on the front of the terminal server lighting up briefly. I found that I could get them to light up consistently by pressing a meter probe on one of the legs of the chopper transformer and after deploying the magnifying glass, I found a tiny crack in the print leading to it. That was a lot easier than I thought it was going to be. I hope it lasts a bit longer this time though. Now I find that the privileged password is not what I thought it is... Regards, Peter Coghlan.
