Category Archives: DECstation 5000/240

DECstation 5000/240 With the TURBOchannel Extender

Posted on October 7, 2018 by rjarratt

Recently I repaired the H7826 power supply in my TURBOchannel Extender. So now I wanted to get it working with the DECstation 5000/240 it came with. The trouble is, I don’t have the cable to connect the Extender to the … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | Leave a comment

H7826 Power Supply Repaired

Posted on September 23, 2018 by rjarratt

After a spell of concentrating on other things I have finally got round to looking again at the H7826 power supply from my TURBOchannel Extender. When I left it back at the beginning of the year I was waiting for … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | 3 Comments

Update on H7826 Power Supply Repair

Posted on January 1, 2018 by rjarratt

It has been a while since I last posted anything about what I have been up to. However, I have been busy trying to find out what is wrong with the H7826 power supply out of my TURBOchannel Extender. I … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | 2 Comments

Corroded H7826 Power Supply

Posted on October 23, 2017 by rjarratt

Now that I have got the DECstation 5000/240 working again it is time to move on to the TURBOchannel Extender that came with it. This is in a terrible state, with lots of corrosion all over the place. The worst … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | Tagged | 1 Comment

DECstation 5000/240 Running Ultrix

Posted on October 13, 2017 by rjarratt

Having recently fixed the DECstation 5000/240 PSU, I wanted to see that the machine actually runs properly and can run an operating system. I had previously had another DECstation 5000/240, which I had swapped for something else, but I had kept the … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | Tagged | 2 Comments

DECstation 5000 Model 240 PSU Fixed

Posted on October 1, 2017 by rjarratt

I have finally fixed the H7878 PSU from my DECstation 5000 Model 240. When I last posted about it, the PSU was not working very well, it was unable to sustain any load. Following that post I asked for suggestions … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | Tagged | 4 Comments

DECstation 5000 Model 240 PSU Failing Under Moderate Load

Posted on September 17, 2017 by rjarratt

The H7878 PSU in my recently acquired DECstation 5000 Model 240 had a shaky start and then stopped working altogether. I found a problem with the input rectifier smoothing capacitors, at least one of them anyway. It was a real job to … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | 1 Comment

DECstation 5000 Model 240 H7878 Possible Fault Found

Posted on August 28, 2017 by rjarratt

As previously reported, the H7878 PSU in my DECstation 5000 Model 240 has failed. Today I examined it more closely and I think that I know what at least one of the causes of the problem is. I started by … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | Leave a comment

DECstation 5000 Model 240 H7878 Power Supply Failure

Posted on August 27, 2017 by rjarratt

When I first got the DECstation 5000 Model 240 I noticed that it would power off after a period of operation. This suggested a problem with the H7878 power supply. I had already inspected it for any obviously leaky capacitors … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | Tagged | 1 Comment

DECstation 5000/240 Progress

Posted on July 19, 2017 by rjarratt

I have made a lot of progress in getting my newly acquired DECstation 5000/240 going again. Before doing anything I took it apart and opened up the power supply to inspect the electrolytic capacitors. They all looked fine. I then … Continue reading →

Posted in DECstation 5000/240, Retro-Computing | Tagged | Leave a comment