I hope that doesn't mean you don't plan on opening the case again. Aside from the fan, your analogue board is showing signs of age, despite adjusting your voltages the Mac is exhibiting symptoms that need to be addressed. It is only a matter of time before it begins to fail again. Think seriously about following Dr. Lee's capacitor upgrades. There is no way to be a vintage Mac enthusiast without routinely opening the case and general maintenance, assuming you actually want to use it. Of course a fan will go a long way toward extending the time between case crackings.
I don't see how the changing the capacitors at this stage is going to help considering the ones on the analog board are only
3 weeks old as I mentioned across the forums. I replaced them already to repair the board with great success. There is only one possible capacitor I can think of that could need replacement (and
could have been overlooked in the initial repair), and maybe I could tackle that down next week some time, but we'll see if it makes a difference or not.
Also, G. Younk's Mac512 instructions are for installing an AC Boxer fan. It appears to me that you tried to install a DC fan to the AC power supply (CR23 & 24). Even reversed wires should not melt an AC fan (Could the fan have been a 115V installed on an international 220V PS?). Younk also shows a 12V AC fan, where Pina specifies a 115V or 220V model (not sure if Younk actually installed the pictured 12V fan as he often reports things he has not himself tested), if you followed it to the word, that would explain a few things as well. Fan installation is a normal routine procedure for those who know what they are doing, but it's your call.
AC and DC. Yes... that would be it. Unfortunately probably the one thing I overlooked during the installation was whether CR23 and 24 are AC or DC lines. The good news is that the fan was nothing special and the analog board was well protected. Always good to have precautions when working on hardware like this, right?
I've studied the pinouts for each connector and I can see where the fan would connect now. Otherwise very simple. However I may or may not add a fan, that's yet to be determined, but i'd imagine i'd have the case open again at some point (especially if I found a capacitor was overlooked and needs replacement) so i'll definitely have it on the "to do" list.
