Hello everyone!
Bottom Line: Still not able to start a game.
Here is what I've done recently:
1. bridged the appropriate pins on J206/J208, acted like it did on the old board, in that it did not start a game-but did register as a start button push during switch tests.
2. bridged J212 pins 1 & 7; it did add service credits but did not start a game.
3. i tested continuity between appropriate pins on J1 and J212, tests passed.
4. took off the coin door interface board, cleaned it and checked it again, checked continuity between all of the appropriate pins, and nothing seems amiss. Checked all diodes with
MM, re-replaced the diode I used yesterday with the exact correct replacement (1N4004) checked with
MM, all the diodes are behaving as they should. Reconnected leads in the machine; made no difference, behaving exactly as before.
5. checked start button assembly and connections; replaced both the button assembly, and the switch itself, and re-terminated a didgy connector at the end of one of wires. Appears to be wired properly, I get a solid cluck, and it is still showing up properly on switch tests.
6. checked coin door switches and coin mechanism all seem to be working properly and nothing seems stuck.
Looking at the CPU now, seeing as I've checked and/or replaced damn near everything else.
At this point, I really don't think it's the start button or wiring/connections to the start button, because I've tested and checked that several times, replaced most of the components, and the switch continues to operate correctly in the tests.
Since I have replaced the board, the only components that haven't changed yet are the ASIC and the EF68B09 (U6), which weren't included with the new board.
I've ordered a new ASIC, and am looking for a replacement for the EF68B09.
If those don work, I don't know, the power driver board is just about the only thing left. That, or there is a short somewhere that is causing the system to fail its pre-game check.
Thanks again to everyone for your help so far! Welcome further ideas!