3 Sep
2025
3 Sep
'25
4:43 a.m.
-----Original Message-----
From: Wayne S <Wayne.Sudol(a)hotmail.com>
Sent: 03 September 2025 09:47
To: rob(a)jarratt.me.uk
Cc: General Discussion: On-Topic and Off-Topic Posts
<cctalk(a)classiccmp.org>rg>; Robert Jarratt <rob_j37(a)hotmail.com>om>; Scott Baker
<smbaker(a)gmail.com>
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-…
Thanks
Rob
