In article ,
Joe McElvenney wrote:
Currently I'm taking the easy way out and am checking everything, as
far as I can, and replacing all the semiconductors on the input side
of the PSU; the multiple output regulator circuits being a nightmare,
I'm hoping the fault isn't in there. I've tried hard to find the
schematic for this unit but don't now ever expect to do so; the HP
'so-called' service manual does not contain any useful information.

IMHO the most common failures are some of the electrolytics at the front
end, so if you have an ESR meter check these first. Then any Schottky
diodes. Then the opto-isolator.

--
*In some places, C:\ is the root of all directories *

Dave Plowman London SW
To e-mail, change noise into sound.