Hi folks, Thanks for the links, I should’ve said I work for a DEC/HPE reseller so I can get replacements through work but I thought there might be some folk here who’ve fixed one before and might have some tips.
Cheers again Adrian > On 27 Feb 2019, at 18:06, Electronics Plus via cctalk <cctalk@classiccmp.org> > wrote: > > https://shop.mitservices.com/product/digital-dec-server-700-psu-h7881-aa/ > in stock in the UK. > > -----Original Message----- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Gregory > Beat via cctalk > Sent: Monday, February 25, 2019 12:48 PM > To: binarydinosa...@gmail.com; cctalk@classiccmp.org > Subject: Re: DECserver 700 PSU fix, H7881-AA > > Adrian - > > ASTEC is now owned by Emerson Power (UK address below). > Emerson Power Catalog (find the 57 watt models): > https://www.mouser.com/catalog/supplier/library/pdf/Emersonpower_catalog.pdf > > PowerClinic in Dallas/Fort Worth area > services a large number of Switch-Mode power supplies. > http://portal.powerclinicinc.com/web/services > Power Clinic Inc. > 3732 Arapaho Rd > Addison, TX 75001 > USA > == > H7881-AA (Refurbished), $177.00 USD > https://www.tamayatech.com/parts.php?g=H7881AA > > H7881-AA Power Supply, 57 watt , $450.00 USD > https://www.ipsystemsinc.com/shopping/pgm-more_information.php?id=630 > > ASTEC - Europe (UK) > Waterfront Business Park > Merry Hill, Dudley > West Midlands, DY5 1LX > United Kingdom > Telephone: +44 (0) 1384 842 211 > Facsimile: +44 (0) 1384 843 355 > == > From: Adrian Graham > To: "General Discussion: On-Topic and Off-Topic Posts" > Subject: DECserver 700 PSU fix, H7881-AA > > Hi folks, > > My trusty DECserver has bitten the dust in a silent and non-violent way > with the fuse still intact so has anyone got tips on troubleshooting? I > know it's the PSU because I 'borrowed' another PSU from work and the unit > is running again. It's an ASTEC unit under the hood, and in my experience > of fixing the older types like the AC8151 (Memotech, TRS80 II/III, Osborne > etc) the chief culprits on an utterly dead PSU are the input caps and/or > the small 220uF or 330uF startup cap in the feedback circuit. > > I haven't checked bitsavers etc for a schematic yet, does such a thing > exist? > Hopefully the ASTEC board has a model number on it. > > Cheers > -- > adrian/witchy > Owner of Binary Dinosaurs, the UK's biggest private home computer > collection? > t: @binarydinosaurs > f: facebook.com/binarydinosaurs > w: www.binarydinosaurs.co.uk > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest private home computer collection? t: @binarydinosaurs f: facebook.com/binarydinosaurs w: www.binarydinosaurs.co.uk
