Tag Archives: H7842

Rainbow 100A Restoration

Posted on July 29, 2025 by rjarratt

I acquired a Rainbow 100A a while back. It had a few problems: It also came with a Floor Stand, an LA50, manuals and disks. PSU Inspection Before switching it on I checked the PSU visually, mainly for any bulging … Continue reading →

Posted in Retro-Computing | Tagged , | 1 Comment

Rainbow H7842 Finally Fixed

Posted on June 29, 2023 by rjarratt

I previously posted about the failure of the H7842 power supply in my DEC Rainbow. I reported that after replacing some parts I was getting an overcurrent detection in the -12V output. This was under bench test conditions using a … Continue reading →

Posted in Retro-Computing | Tagged , | 2 Comments

DEC Rainbow H7842 Power Supply Failure

Posted on November 20, 2022 by rjarratt

A couple of days ago, I received a request to format some RX50s in one of my Rainbow machines. So, I got this one out to check that it still works. I was happy that it just powered up fine. … Continue reading →

Posted in Retro-Computing | Tagged , | 3 Comments