Hi wa4aos, I didn't notice any obvious damage on the board ( A60 ). The board in my units are different than the ones in my manuals ( A60 revision B ) . There is one 22 uf cap across the supply rail that checks ok. I was surprised there were not that many bypass caps on this board ( many SN74LSXX low power schottky ). Without extender cards it is difficult to troubleshoot live. The manuals are extremely detailed. A lot to digest . This is the controller board containing the processors and ROM. It may be beyond my ability to repair.
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Did you see any obvious issues on the original A6 pcb, possibly a tantalum cap.
Hi wa4aos, I didn't notice any obvious damage on the board ( A60 ). The board in my units are different than the ones in my manuals ( A60 revision B ) . There is one 22 uf cap across the supply rail that checks ok. I was surprised there were not that many bypass caps on this board ( many SN74LSXX low power schottky ). Without extender cards it is difficult to troubleshoot live. The manuals are extremely detailed. A lot to digest . This is the controller board containing the processors and ROM. It may be beyond my ability to repair.