macintosh analogue board reconditioning

In the pre SE analog boards (128, 512, 512ke, Plus... they all used essentially the same board), there were a few common problems. One was a cracked solder joint on the main power feed (?). I think its location was "J1", if I remember correctly. The joint looked broken, in that the pin sticking thru the back side would have a blob of solder around it that would have a crack in it, and possibly be seperated from the board. If I remember right, it was a red cable in a group of cables, located kind of in the center of the board. Another common problem was a bad high freq capacitor. It was a large capacitor located near the top of the analog board. I think it might have been the only large cap up there. Unfortuantly, it didn't tend to show any damage to a visual inspection. I can get specs on the cap and location when I am at work tomorrow. The final common problem was a bad diode near the bottom of the board. When it was bad, the machine would make a "flup flup flup" kind of noise when you try to turn it on (Ah HAH... sounds like what you might have). Again, it showed no signs of damage toa visual inspection, but would test bad. And again, I can get specs on it when I get to work tomorrow. An ever so handy book for fixing these problems is "The Dead Mac Scrolls", but good luck finding a copy, I think it has been out of print for some time (although, there may be an updated version, I just tend to doubt it will cover the old units). I happen to have a copy, and would be more than happy to skim thru it and work with you to find the problems and repair them. I will email again tomorrow with better details of where to check and what to test. -chris <http://www.mythtech.net>