VAX 4000 PSU (H7874) Schematics

[Aaron Jackson]

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 via cctalk <
> cctalk at classiccmp.org> wrote:
>
>> 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 there is nothing from
>> the 12V rail. There were some *very* dodgy looking caps which I have
>> replaced, and some *very* exploded MOSFETs, which I have also
>> replaced.
>>
>> If anyone has schematics, or know where I might find them, it would be
>> much appreciated.
>>
>> Thanks,
>> Aaron.
>>
>>


-- 
Aaron Jackson
PhD Student, Computer Vision Laboratory, Uni of Nottingham
http://aaronsplace.co.uk