It would be a lot easier to replace the large circular regulator if you're
taking the shotgun approach, and much more likely that the regulator is a
source of faults.  and it's cheaper.  For the h744, 45, 54.  BUT measuring
things is the best way if you can do it.   Pull the values from the
backplane, there are test points that you can measure from.

On Thu, Jan 6, 2022 at 2:30 PM Wayne S via cctech <>

> So you want to replace capacitors just because they “whine” ?
> I’ll say that because you are learning, that is not good troubleshooting
> practice.
> Make a checklist of troubleshooting power supplies.
> There are a lot of good youtube videos  and other internet information  on
> how power supplies work, how to check them and repair them. There is danger
> when working  with power supplies.
> When working on electrical equipment do you know about the  “working with
> one hand in your pocket rule?” Doing this stuff, videos and reading, is not
> overly time consuming and may save your life!
> Sent from my iPhone
> > On Jan 6, 2022, at 07:50, Jon Elson via cctalk <>
> wrote:
> >
> > On 1/6/22 2:52 AM, Rob Jarratt via cctalk wrote:
> >> I think I may need to replace the two output capacitors in some of my
> H744
> >> regulators. These are screw terminal 6,000uF 10V parts. I have looked on
> >> Mouser, Farnell and Digikey and there don't seem to be any available,
> and
> >> any that are listed are really rather costly.
> >>
> >>
> >> Does anyone know where I might find some, preferably from a reputable
> >> supplier. Note that I am in the UK.
> >>
> >>
> >
> > Mouser is a good place to find big caps (or at least used to be).  You
> might have to get "snap in" caps and solder wires to them, that style seems
> to be more available.
> >
> > Jon
> >

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