Mac IIci rebooting over and over automatically

[reallyrandy]

If you check the schematics...

You can see that Pin 2 of UE13, goes to the positive side of C12, and to the resistors R44 and R43, that most likely are in the backside of the PCB and are connected to the pad you marked as "B", so, maybe this can help you to interpret the connections, but in general, if you see a trace that goes to a pin then you should always get connectivity between all ends of that trace, and if you don't, something needs to be fixed.

Thank you. Unfortunately, I know embarrassingly little about how to read a schematic. But this will help fix several issues I'm sure.

 

[Jamieson]

Did you get it going? If not clean around and under those 74HC132D devices really good with IPA. There's something gunky going on under there.

 

[reallyrandy]

I've not worked on it much. I did go through the area with a continuity meter and fixed a few things. I'll see if I can get under those ICs with something.