[vcf-midatlantic] PDP-11/10 PSU Repair/Warning

systems_glitch systems.glitch at gmail.com
Thu Jun 6 15:05:50 EDT 2019

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.


On Thu, Jun 6, 2019 at 12:23 PM Jameel Akari via vcf-midatlantic <
vcf-midatlantic at 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

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