Re: VAX 4000 PSU (H7874) Schematics

2018-06-09 Thread Aaron Jackson via cctalk
Hopefully you have changed the caps before the leak all over your board :) Bill Degnan writes: > I have one or two mostly new 4000 supplies here, plus two working 4000's. > Did not know until recently this was an issue, I guess I have been lucky. > b > > On Fri, Jun 8, 2018 at 9:04 AM, Holm Tiff

Re: VAX 4000 PSU (H7874) Schematics

2018-06-08 Thread Bill Degnan via cctalk
I have one or two mostly new 4000 supplies here, plus two working 4000's. Did not know until recently this was an issue, I guess I have been lucky. b On Fri, Jun 8, 2018 at 9:04 AM, Holm Tiffe via cctalk wrote: > Aaron Jackson via cctalk wrote: > > > > On Thu, 7 Jun 2018, Aaron Jackson wrote: >

Re: VAX 4000 PSU (H7874) Schematics

2018-06-08 Thread Holm Tiffe via cctalk
Aaron Jackson via cctalk wrote: > > On Thu, 7 Jun 2018, Aaron Jackson wrote: > >> The VAX turns on and the status LED stays on F. The DC lamp does not > >> illuminate on the PSU. 5V rail appears fine but there is nothing from > >> the 12V rail. There were some *very* dodgy looking caps which I hav

Re: VAX 4000 PSU (H7874) Schematics

2018-06-08 Thread Aaron Jackson via cctalk
Thanks Bill. I emailed him, some decent advice but mostly prices :) Aaron Bill Degnan writes: > There is a guy named at Joel from global-itcorp.com who has experience with > these, he may have an idea. Tell him you spoke with Bill Degnan. > b > > On Thu, Jun 7, 2018 at 3:49 PM, Aaron Jackson v

Re: VAX 4000 PSU (H7874) Schematics

2018-06-08 Thread Aaron Jackson via cctalk
> On Thu, 7 Jun 2018, Aaron Jackson wrote: >> The VAX turns on and the status LED stays on F. The DC lamp does not >> illuminate on the PSU. 5V rail appears fine but there is nothing from >> the 12V rail. There were some *very* dodgy looking caps which I have >> replaced, and some *very* exploded M

Re: VAX 4000 PSU (H7874) Schematics

2018-06-08 Thread Christian Corti via cctalk
On Thu, 7 Jun 2018, Aaron Jackson wrote: The VAX turns on and the status LED stays on F. The DC lamp does not illuminate on the PSU. 5V rail appears fine but there is nothing from the 12V rail. There were some *very* dodgy looking caps which I have replaced, and some *very* exploded MOSFETs, whic

Re: VAX 4000 PSU (H7874) Schematics

2018-06-07 Thread Bill Degnan via cctalk
There is a guy named at Joel from global-itcorp.com who has experience with these, he may have an idea. Tell him you spoke with Bill Degnan. b On Thu, Jun 7, 2018 at 3:49 PM, Aaron Jackson via cctalk < cctalk@classiccmp.org> wrote: > I am trying to repair a VAX 4000 power supply. Does anyone hav

VAX 4000 PSU (H7874) Schematics

2018-06-07 Thread Aaron Jackson via cctalk
I am trying to repair a VAX 4000 power supply. Does anyone have the schematics? I can't find anything on BitSavers and I'm not completely convinced it was even designed by DEC. The VAX turns on and the status LED stays on F. The DC lamp does not illuminate on the PSU. 5V rail appears fine but ther