check the diode for that control room switch? It may be remotely mounted on the playfield.

check all the trough switches, including #7 on the right side of the trough?

The diodes are on the switch in all versions I've seen.

Don't suspect the MPU yet. It is 99% likely to just be a faulty tough switch or it just needs to be adjusted.

Diodes, diodes, diodes!
If you have a shaker motor in the game, disable it in test mode. My girlfriends JP has an unreasonably powerful shaker motor, and it literally kills the diodes. All of the problems she had were diode related, which is good, because that is the easiest element to replace.
Usually, the diodes are the first things to go. Make sure the solder connections look good, and like thedefog says, check the switches. Maybe the outhole switch is being activated by ball 6 in the trough?

To me, this sounds like a diode issue on the kick-out solenoid.

The ball not kicking out to the shooter lane? That could be dimples in the ball trough that need smoothing or could be magnetized balls if they are chromium...

anyone know off hand what diodes are on the trough switches?

I think they are 1N4001 (112-5001-00).

I think you need to measure your 5 volts on the MPU board. Anything lower than 4.76 volts, you will get a lot of random things happen. If it is low, then replace the c2 100uf 25 volt cap on your power supply with either 25 volt or 50 volt cap. Do not go any lower than 25 volts.

The ball trough switches going bad on JP is all too common. This is the biggest issue the game has. So if not the diode, you may just have a failing microswitch.

Yeah those trough switches are in a place that's easy to bang them on the lockbar area when putting the playfield up and down to work on it. I mangled a couple of mine before I learned how vulnerable they are. Also that diode on the control room switch get's solder joint breaking and diode breaking all the time. Service bulletin says put a dab of scilicone on it to absorb vibration. I did that on mine after it was borken and cracked replace and it's been fine since...

Tom

Okay, i found another post that said they are 1N4004, ill just have to look when I get home from work but im having major trough issues and I need to get my JP back up and running

Another problem area in that machine is the switch that signals the machine that a ball is in the kicker to kick a ball into the trough. That one gets out of alignment quite easily, sounds like that might be your problem.

sorry to the OP for thread jacking with my issues

I have changed that switch and the solenoid already and it doesnt work, i think i have something further up in the daisy chain that is not registering so i got all new switches for the trough from marcos and picked up some 1n4004 resistors on my lunch break as the electronics store is closed when i get off. Hoping I can isolate the problem this weekend. ive reflowed some solder joints but now im just gonna replace these and see if i can figure it out