Quoted from Gogojohnnyquack:
Good morning fellow BKers. My Black Knight was left on overnight and now this morning the solenoids are not doing anything and the Black Knight is skipping words in his phrases. I'm sure that I can figure out the solenoid issue but does anyone have an idea of what might be happening with the speech?
I can't recall but alot of the older games use solenoid drivers to cue the speech from the sound board. The solenoids not firing could have some reason that the speech board is never telling those phrases/words to play back. You can look up the transistors in the manual to see what they fire and work your way back from there.
Alright, just looked into it. The system 3-6 get triggered that way, not System 7 like Black Knight. Here's what the pinrepair guide says:
When System7 came with Black Knight, driver board transistors were no longer used to trigger sounds. Instead the System7 CPU board had an additional PIA chip at IC36 which triggered the sounds (this freed up the driver board transistors for coils instead of triggering sound). The sounds were still generated by the same sound board in the same manner though, using the same pinout. Grounding sound board connectors 10J3 pins 2,3,4,5,7. Just this was now done by the CPU board's extra PIA chip at IC36 (and a new connector on the CPU board at 1J8). Here's the system7 CPU connector 1J8 pins. Note this connector also handles commas for the score displays:
1J8 pin1: Comma for displays 3 & 4 (Brown/White)
1J8 pin 2: Comma display players 1 & 2 (Violet)
1J8 pin 3: Key pin
1J8 pins 4-7: No Connection
1J8 pin 8: Sound Select 4 (Yellow) to sound board 10J3-7
1J8 pin 9: Sound Select 3 (Green) to sound board 10J3-4
1J8 pin 10: Sound Select 2 (Blue) to sound board 10J3-5
1J8 pin 11: Sound Select 1 (Red) to sound board 10J3-2
1J8 pin 12: Sound Select 0 (Red/Yellow) to sound board 10J3-3
With the sound board connector pinout info, some (not all!) of the individual sounds can be triggered by momentarily grounding the sound board Sound Select pin. You won't get all sounds this way (many sounds are triggered from a combination of pins being grounded), but at least you can do some prelim tests on the sound board. Also helpful is of course the sound board test switch, which should fire off most of the sounds at any time.