On mine there was one value of cap in particular that seemed to leak everywhere there was one the PCB. The others did not show signs of leaking, but I decided to just replace them all at once.
The legs of the caps that go to the + or – rails tend to have pads that are not thermally isolated which makes them a PITA. I had to preheat the PCB with a small heatgun to get the caps to desolder nicely. Jeff_Birt (Hey Birt!) From: M100 <[email protected]> On Behalf Of Ed Graffius Sent: Sunday, May 19, 2019 9:38 AM To: [email protected] Subject: [M100] A few thoughts on the power supply (again) When I was diagnosing my 100, I had come up with a 122Khz-ish oscillation frequency on the primary side. Is this normal? I know that in some link somewhere I had seen a scope trace of proper primary side, perfectly asymptotic around the .5-.7 turn on voltage of the transistors that make it happen, but I will be darned if I can find the link now or remember the time period involved. (122Khz is 8micro seconds-ish) I am curious about what the spec should be cuz as caps age, they go DOWN in uF-ness and this might speed things up. Whereas mine works, how well is it working? as frequency goes up coil saturation becomes a problem (not unlike ignition breakdown on your car if you significantly increase rpm on a stock point/coil system) Has anyone ever probed the frequency? This makes the video by 'hey Birt' productions even more salient to follow...Im gonna hunt up the link to the new SM scan and delve which caps affect this to make them priority
