Quoted from GRUMPY:
So the upper jet bumper is fine and since the lower left jet bumper works in test but not during a game, most likely an activation switch issue. The switch is out of adjustment or has a broken wire. Now for the right jet bumper not working in test or game play, there maybe a board problem, a switch problem, a broken power wire/ground wire problem, a bad coil and or a combination of these issues. You can start by briefly grounding the metal tab of Q-73 transistor with a jumper wire to see if the coil fires. If it does fire then you know the power/ground wires and the coil are good. Then you will need to look for a board problem. let us know what you find.
Sorry for taking so long, but it’s been very busy over here in my world. 3 months ago I mentioned that two jet bumpers were not working. I had bought and installed a special solenoid fuse board to protect my main board. I found that one of the fuses blew out on the solenoid fuse board and this caused two jet bumpers not to work. The fuse that blew was on the solenoid board and it’s 2.5A. I inspected all fuses on my HS and found that the main power supply board F2 fuse was a 4A and not the 2.5A that is required per specifications. I did a continuity test to see if I had a short (TIP102s in the special solenoid section Q69/Q71/Q73/Q75/Q77/Q79) and all is good. Funny thing is the game works great without the solenoid board installed, but I’m afraid that I have a short somewhere on my HS and I don’t want to see it go up in flames. Any suggestions on where I should look? Grumpy said that a switch may be out of adjustment, but I’m not sure what switch he is talking about. I’m Tupid!