With the supplies being switchers do not use a autotransfomer (Variac). If they were mine I would replace the caps even if it meant speing $100 or so and waiting. And being switchers they will need a minimum load to operate correctly.
-pete On Mon, Aug 1, 2016 at 7:12 PM, Lyle Bickley <lbick...@bickleywest.com> wrote: > Hi Hayden, > > On Mon, 1 Aug 2016 19:29:05 -0600 > Hayden Kroepfl <perlpow...@gmail.com> wrote: > > --snip-- > > > With regards to the power supply, I'm thinking my best bet would be > > to do a power on with no cards in the system. Though I'm not sure if > > all the power rails would even come up without a load on it, since it > > sounds like it may do some power sequencing from what I've read. I > > was wondering if anyone has some experience with testing a similar > > power supply that hasn't been run in at least 10 years? > > Those of us who have brought up HP2100s that have been stored (even in > military packaging) know the power supplies can be a "bear". The PS is > a "fold out" deal - and never used to be repaired in the field by FEs. > They were swapped with new units - and the failing supply sent back to > HP for refurbishing. The process was detailed to me by a person who sold > 2100's as an OEM for many years. > > That being said, they are a early design switching supply - and should > have a load when powering them on. > > > I'm not sure if using a variac to slowly warm up the supply and the > > caps would be wise on one of these power supplies. I'm not sure how > > the switching supplies would handle the low voltage at the start. > > I would definitely NOT use a variac on them. It's best to check the > caps (and reform if necessary) and then power it up with a load. You may > have to "gently" (as in slowly) turn the PS on and off a number of times > to work out the years of "dormancy" (reforming the capacitors that you > can't get to ;) > > > The only I/O card that was installed in both machines, besides a > > terminator board in only one of them, is a serial interface made by > > some company with the logo CMC. It uses a COM2502 UART which I was > > surprised to find a datasheet for, however I haven't found any > > information on the card itself. I have a photo of the card in the > > album linked below if anyone has any information on it. > > The 2100 has a weird I/O addressing scheme - so check the manual > carefully. Moving a card from one location to another in the mainframe > changes its address! That's very different from DEC (and many > others) who had switches or jumpers on boards to change addresses. > interrupts, etc. > > > I know this email is getting a bit long, but with regards to the > > memory both machines have a ID(16K) driver board, and two core > > modules. However one machine has both core modules marked 02100-60052 > > on the bridge, and the other has one marked 02100-60052 and the other > > 02100-60054. Is there any difference between these modules? I'd > > assume by the 16K driver in both, that all of the core modules are > > 8KW modules. Would that just be a later revision or is one a > > different size? > > Look on bitsavers: http://bitsavers.trailing-edge.com/pdf/hp/21xx/ > and start reading manuals (particularly the Maintenance and Drawings). > There a wealth of information to be found there - and it's what I used > to get my 2100S running. > > --snip-- > > > I'd very much appreciate any help or suggestions that peopleh ave. I > > really want to get at least one of these machines back into full > > working order to have some fun programming with. > > HP2100 restoration is very doable. > > And the 2100 has one of the best front panels going :) > Like how can you not like buttons that light up when you push them!? > > Most of my problems with my 2100S were related to the power supply - > and a few related to memory. > > Wishing you the best!!! > > Cheers, > Lyle > -- > 73 AF6WS > Bickley Consulting West Inc. > http://bickleywest.com > > "Black holes are where God is dividing by zero" > >
