Definitely have a go at it! Getting a 24 VAC transformer with sufficient current-supplying capacity for bench testing was really a huge step in the right direction for me. I've got the crimpers, pins, and shells for the various Mate-n-Lok connectors DEC used, so if you need a pigtail made up or something, let me know. I'll be building a permanent home for the 24 VAC transformer, with a current meter, so it's not just sitting on my desk with primary connections exposed and everything. Figure there's almost certainly more DEC power supply troubleshooting in my future :P Yeah, a lot of the stuff is already up, but do check that you don't have a more recent print, or one that includes a variant not currently shown! I personally prefer dead tree hardcopy to scrolling through schematics, so having a duplicate print set isn't the worst thing! Also, thanks for getting me the key to power this system on :) That's the copy you sent me, pictured in the writeup. Thanks, Jonathan On Thu, Jun 6, 2019 at 12:23 PM Jameel Akari via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
On Wed, 5 Jun 2019, systems_glitch via vcf-midatlantic wrote:
full writeup here: http://www.glitchwrks.com/2019/06/05/pdp1110-psu-repair
(Go read this, it has photos.)
I finally fixed the power supply in my PDP-11/10S, it turned out to be a shorted bridge rectifier on the 5411086 board, which provides +15 VDC, LTC, and AC LO/DC LO. Unfortunately, when it failed, the rectifier burned up the
Very cool, and not the worst thing to repair. My 11/05 has been sitting around for years with some sort of power problem which I've been dreading, but this encourages me to work on it.
I also appreciate the links to the archive.org scans of the manuals & prints. I have boxes full of physical copies and I'm reminded I should check before committing to scan any of them.
-- Jameel Akari