[sdiy] MKS70 power supply issue

[w.james.meagher at gmail.com]

Thanks for the suggestions everyone, I'll investigate further when I'm back in town on Monday. 

What I do know off the top of my head is that the mains in these parts run at 120V, not 117V - I'll test for further particulars when I'm back.

I agree that it would be nice to know where the +7Vunreg is supposed to be going, but I really can't make it out on my poor copy of the assigner and other schematics. I'll see when I'm back if there's a JX10 service manual out there (that might be clearer than my MKS70 manual), to shed some light on the +7unreg's destination.

I also recall that there's a diode in that PSU I was eyeing suspiciously (as someone else here...or on AH...has suggested), so I'll also test that one when I'm back to make sure it hasn't failed.

Thanks for all the thoughts everyone!

Sent from my iPhone

On 2012-11-15, at 4:31 AM, rburnett at richieburnett.co.uk wrote:

> I'd check your local mains supply voltage coming out of the wall and check the setting of the tap changer on the transformer primary.  Your mains voltage might just be towards the top of its tolerance range, or the tap selector might incorrectly be set to 220V when the actual mains voltage is closer to 240V.  (Or 100V vs 117V in US!)
> 
> As Gordon said, it's probably fine.  The voltage regulators will just run a tad hotter.  But those are the things I'd investigate if I wanted to get to the bottom of it.
> 
> -Richie,
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