KGLlewellyn
Well-known member
Hey there,
I've been having a bit of a nightmare trying to get my Macintosh II Rev. A to power up. My board is one of the older models which doesn't have the SMD electrolytic capacitors on, it's only got the axial caps which don't typically leak (info on this board here: https://recapamac.com.au/macintosh-ii-a/). I've been looking through all of the schematics for the power on circuitry, however it seems that they all reference the Rev. B board. Does anyone have any ideas how the batteries hook up in the original Mac II board so I can find out where to test continuity and voltages from the batteries? Even when the PSU wasn't giving me issues, installing known-good batteries would not resolve the issue, the Mac always had to be jump-started.
I used to be able to jump-start this Mac, however that stopped working around 3 years ago. I've since recapped the power supply to no avail. Has anyone tried doing any ATX conversion of these supplies or aware of any other components in it that are known to fail? My PSU is made by Sony, if that helps.
Thanks!
Kai
I've been having a bit of a nightmare trying to get my Macintosh II Rev. A to power up. My board is one of the older models which doesn't have the SMD electrolytic capacitors on, it's only got the axial caps which don't typically leak (info on this board here: https://recapamac.com.au/macintosh-ii-a/). I've been looking through all of the schematics for the power on circuitry, however it seems that they all reference the Rev. B board. Does anyone have any ideas how the batteries hook up in the original Mac II board so I can find out where to test continuity and voltages from the batteries? Even when the PSU wasn't giving me issues, installing known-good batteries would not resolve the issue, the Mac always had to be jump-started.
I used to be able to jump-start this Mac, however that stopped working around 3 years ago. I've since recapped the power supply to no avail. Has anyone tried doing any ATX conversion of these supplies or aware of any other components in it that are known to fail? My PSU is made by Sony, if that helps.
Thanks!
Kai