beeka wrote: ↑Tue Apr 27, 2021 9:01 pm
I recently got a kit from Exxos but it doesn't quite match up with the photo... I think the 22uF 25V, which the photo says to replace with a 10uF 50V, is meant to be populated by the 22uF 50V in the kit... but this is only by a process of elimination, so wanted to check. Everything else seems to match up.
C23 ? I originally change that to 10uF as the power supply I had at the time took 3 to 4 seconds to power up otherwise.. But then later I found other power supplies were powering up way too fast.. So I actually put back the original value of C23 which is 22uF.
beeka wrote: ↑Tue Apr 27, 2021 9:01 pm
With that in mind... do I need to replace the opto? And if so, is a generic PC111 from random ebay stores going to be worse, or is the CNY17 F the chip of the moment?
I don't recall offhand, but it is mentioned somewhere in the thread I think it was the one you mentioned. I have not personally tried or tested this Opto, but apparently it gives better performance.
beeka wrote: ↑Tue Apr 27, 2021 9:01 pm
PS: I measured the ripple of the PSU before I started by using the AC mode of my multimeter... on the basis that some figure is better than none. Has anyone compared the how well / badly this method matches up to an oscilloscope (where actual noise could be visualised).
It is unlikely multimeters will measure the frequency of the power supply on AC..
The only scope waveforms I have are here..
https://www.exxosforum.co.uk/atari/last/ ... tm#PSM5341
To my knowledge nobody else has tested a before and after recap, or before and after replacing the Opto.