I have a -35 modified for 2-2732 EPROMs for U2 and U6. The board is on the bench with known good U2, U6, U9, and U11 chips. When power up the LED is locked on.
This is a board I repaired two years ago with some corrosion damage. It worked fine until recently. Suspecting the original ROM's were bad I purchased the 2732 EPROMs and modified the board. It still doesn't work. Any troubleshooting repair advice? I have a logic probe and DVM, but limited knowledge of circuits. I can follow instructions