> -----Original Message----- > From: Wayne S <[email protected]> > Sent: 03 September 2025 09:47 > To: [email protected] > Cc: General Discussion: On-Topic and Off-Topic Posts > <[email protected]>; Robert Jarratt <[email protected]>; Scott Baker > <[email protected]> > Subject: Re: [cctalk] Re: Repairing an Olivetti M24 PSU > > Where is the scope connected? > Can you measure across the 5v connection and spread out the trace to see > the ripple? > When connected there you should a fairly square wave with no negative > going pulse. The top part of the trace should hsve the ripple. > > Sent from my iPhone >
It was connected to the GND and +5V outputs of the PSU, in the schematic it is the two outputs marked individually between J254 and J100. The AC coupled output on a shorter timebase is shown here, not sure if this is what you meant. https://rjarratt.wordpress.com/wp-content/uploads/2025/09/5v-output-ripple-after-replacing-caps-expanded.png Thanks Rob
