> -----Original Message-----
> From: Jon Elson <[email protected]>
> Sent: 06 September 2025 16:04
> To: [email protected]; 'General Discussion: On-Topic and Off-Topic Posts'
> <[email protected]>
> Subject: Re: [cctalk] Re: Repairing an Olivetti M24 PSU
>
> On 9/6/25 01:26, Rob Jarratt wrote:
> > Thanks Jon. In my case even when the outputs are at 0V, I can see the that
> the output transformer is producing outputs, if that is true would that
> confirm
> that startup is not the issue here?
>
> Well, maybe. If it is a steady ~20 KHz on the transformer, the startup
> circuit is
> OK. If it is an intermittent pulsing a few times a second, then the startup
> is
> "trying" but the converter is failing to power itself. (Or the crowbar is
> killing
> it.)
>
This is what I see on the output of the transformer on the anodes of the
rectifying diodes to the GND output
https://rjarratt.wordpress.com/wp-content/uploads/2025/08/diodes-on-5v-output.png
Regards
Rob
