Hi again,

I am experiencing a new issue with my HS2 machine. The game was working fine for a few days after I fixed the ball lock, but now I am having an issue where all solenoids in the machine will just stop working. This has happened 3 times so far. Two were during gameplay where both flippers suddenly stopped working along with all other coils (when the ball drained, the solenoid never fired to kick it into the trough even though the switch was registering.

When I enter the debug menu while this is happening and begin the solenoid test, they don't work from there either. Not a single coil fires during the test. The only thing that works in the solenoid group is the mars lamp motor.

Rebooting the machine does not change anything. After a reboot the game still fails to ever file a coil for as long as the problem persists.

So far, this issue has resolved itself within 5-15 minutes. After a little, the game suddenly starts working again. I've entered the switch diagnostic menu, and everything there seems to be OK. All the expected switches are registering at any given time. If I poke the slingshots, I see the switch register but they do not fire. Same with the pop bumpers, etc...

While this is happening, I don't notice any other odd behavior with the machine. The dot matrix still behaves as expected, the mars lamp still works fine, and all the switches sounds and lights behave normally.

I'm guessing this is some sort of bad connection since the problem comes and goes. Can anyone suggest how to approach diagnosing this? I currently do not have the full wiring diagram for HS2, but I ordered it yesterday. I was unable to find it online after looking for a few minutes.

Thanks,
DML1001

Thanks for the advice. I have my multimeter ready to go, and I will post here if I get the issue to happen and manage to check the voltage before it corrects itself.

Just noticed (7 years late) that I never posted the solution to this issue, just in case anyone else encounters the same problem. In my case, the problem was actually a faulty main power relay on the power driver board which would intermittently release momentarily, causing a loss of power to the solenoids and other system components. I eventually found this when it progressed and got much worse. I was able to replace the relay and repair the board.