1st off I would like to thank the group for the wealth of knowledge I have gained lurking, reading, and researching. Here is what I have going on at the moment..
What initially was happening, was the game turn on and fire up, then after a few minutes or longer, it would cut on and off. (3 Main board lights would come on and the monitor board light ) . This was somewhat intermittent to the point of " I need to see what is going on. " Tested Power brick and had issues with the 36v at Pin 6 and Pin 7. I was checking them correctly, not grounding at Pin 5, as that would give me half value. No blown fuses. I pulled the power supply and there was a burnt wire connected to the Bridge Rectifier. I checked the bridge rectifier between legs, both ways and all 4 diodes seemed fine in there. (checked with BB disconnected) I replace the wire connector and also put in a new Big Blue. Pulled 3 boards and edge boards and cleaned all the traces, nothing bad or burnt. After. that, all was good with the PS Voltages it seems and checked voltages at the ARII board. That is all fine and dandy. Cleaned main PCB board and it did have much dirty filth on one of the chips above the muffin fan. (* Note to self and others. * ~ Check your fan(s) occasionally. I have had this machine for 30 years with very minimal use and never thought it could get so gross with brown fuzz. Also replaced the power cord that was long overdue of being changed with the one I bought many years ago that was prewired with the Atari Molex. With all that said and done, i did have her back up and running for a good day. Was hoping all that good time was behind me. BUT...Yesterday, I had fired it back up and it was running, walked away for 15 minutes and came in to nothing going on.
I just Pulled PS out and checked to see if that same wire end that had fried before, and it looks fine. I did check the bridge rectifier again just now, but with the wires from BB still attached and BB to check that again. I think i need to take one side of wires off BB to accurately check that again correct?
I am still getting good Voltages to the main board as of now, but 3 lights Mainboard and Spotkiller light is on. Sidenote if helpful ( Board with the 3 red lights, there is 4 chips about centerish of that board that get hot, I know things get warm and hot, but those seem more warmer than the others ). Thanks for reading and your time.