- Monitor not showing anything (red LED on monitor board is lit, and seems to flash every 2 seconds)
Sounds like it's trying to power up but fails. The 6100 is one piece of ---steaming pile of meadow muffin--- IMHO compared to the Amplifone, but you can get it running with a lot of patience. Get a LV2000 or LV6100 (from Mark Spaeth). Every 6100 should have one. Further, the "usual" cap-kit and check ALL solderings. Yes ALL of them. Start with the deflection PCB. The connectors are the most likely to have bad solderings. Check them with a DVM or a magnifying glass. I suggest re-soldering all the connector points.
Same on the HV and neckboard, check/redo at least all connector solderings. The one I worked on had a particularly badly soldered neckboard. At one spot there even wasn't any solder at all, with the resistors' leg sticking through the hole ! I will have to resolder that entire board.
- With test switch in down position, on power up I get 16 beeps, a pause, then 16 again and it seems to repeat like this.
If all beeps are of a low tone than congratulations, it just passed the memory tests.
All board "single" LEDs are lit. The main board "group of 3" LEDs light on power up, then turn off after about 2 or 3 seconds.
Again, congratulations, that's perfectly normal behaviour for a working board-set.
- Voltages: +5 is at 5.03v, +12 is at 11.5v. Should I raise this?
NO ! The 5V is perfect and you can't separately regulate the 12V. It'll be fine.
- Coining up makes no sound. It does not even trigger my coin counter.
It's in free-play.
If free-play is off, you get "The force will be with you" at the first credit and "Always" at the second credit.
When it's in free play, it will say "The force will be with you" when it's powered up fully and you can start a game by pressing one of the fire buttons. You hear "Red 5 standing by" when you've entered the difficulty selection screen. Press a fire button at that time and you should hear the game sounds !
- Pressing the button next to the service switch doesn't make a sound or anything.
That's normal. In game running mode it doesn't do anything at all. In test-mode it will cycle through the various test-screens but of course you don't see that.
So, I think you're board-set is working and your WG is not. Not a bad start.