Out of nowhere my Torpedo Alley has a funky issue: the outhole kicker won't work. Neither does the associated "scope" (sinking ship) flashers.
Unfortunately there is no smoking gun here, so this might be a challenging one. Troubleshooting, symptoms, and leads are as follows:
- When the outhole switch is triggered, the PPB relay just clickclickclickclickcliks. If you release the outhole switch, it stops. Game plays perfectly fine otherwise.
- Solenoid test confirms the coil/flasher - Solenoid 7 - for this does not work.
- Transistors for Solenoid 7 look fine and meter fine
- As it happens, I had some cold solder joints on the PPB circuit for this last April, so that was the first place I looked. But near as I can tell, the PPB components are all OK... despite the evidence of heat on this one specific circuit. But all components are in spec. I replaced the relay diode.
- Is the MPU Solenoid 7 transistor bad despite testing OK? Well, if I disconnect that solenoid's harness from the MPU, the PPB relay still clickclickclicks... so it IS in the PPB somehow?
- Looking at the PPB diagram in the manual, there are several I/O connectors... maybe something else is escaping me. Let's disconnect all the connectors and try to narrow down the fault source. Well, one by one... ultimately disconnecting ALL of them, it still clicks! Well that of course isn't true: I have to connect power to it at CN6, which all goes through the relay. But absent all other signals via the connectors, what the heck is telling it to click the relay at that point?? Because yes, if I release the outhole switch, the clicking stops!
- If I disconnect the both switch matrix connectors from the MPU, the PPB clicking stops. Ah... is it a switch matrix issue....?
- ...testing the matrix, all board components test in spec, including the ones for the outhole. But it occurs to me, since I have to unplug BOTH switch connectors to clear the fault, that it might really not be the switch matrix as much as me essentially disconnecting the switch itself... which is also what would happen if the coil would fire and kick the ball off it... so yes, it's still essentially a coil fault, but not really?
- FWIW the Diode on switch tests fine.
So... what am I missing here? I'm still baffled as to why the PPB clicks only with its power harness connected, when that outhole switch is triggered. Switch tells the game to fire the coil but it can't... so the switch stays triggered... that much makes sense... but I disconnected all coil signals in the PPB so what is the routing I am missing in the schematic? And what could the problem be?