[sdiy] MKS70 power supply issue

[Gordon JC Pearce]

On 15/11/12 05:27, james meagher wrote:
> Hey Paul - thanks for that funny thought. Indeed my multimeter is
> reading peak to peak (max, min, or avg).
>
> Here's what the "7V unregulated" leg looks like on my scope, and with
> it is how the +5V leg looks for comparison.
>
> http://www.flickr.com/photos/63824598@N04/8187601216/in/set-72157632011080469/

Without seeing how the 'scope is set up (AC/DC coupling, volts per 
division) it's difficult to interpret.  It looks like it's showing 
around 1V of ripple, if I've read the LCD correctly.  It's worth 
checking the rectifier for that rail, as one of the diodes may have 
failed.  That's far more common than a faulty capacitor.

If it's a "rough" unregulated rail and intended to feed a regulator 
somewhere else on the board, it may well be just fine.

-- 
Gordonjcp MM0YEQ