I just finished replacing the playfield (and a bunch of other stuff) on my Monopoly. I was having issues with the pop bumpers not being sensitive enough, so I attempted to adjust them....and...guh...zapped something. Yes, not smart..I know.
At any rate, the lower 3 pops are not working at all. I can fire the solenoid through the service menu, but none of the switches work (testing underneath with my finger).
Does anyone have any ideas how to troubleshoot this problem? I looked through the manual for fuses, but I don't see anything about a fuse that would control just these switches.
Thanks for the help. If it's a fuse (and I really hope it is), wouldn't all coils stop working? ..and the coils are firing when I test through the service menu..
Do the following switches work?
I had a similar issue to this but it was with a flasher. The manual should show the fuse that controls the pops and whatever else. See if the (whatever else) other stuff works and if so, start with the last thing on the trunk and work backwards from that (towards the connection to the board) until you find the first thing that still works. The problem will be between that and the first thing that's out (moving away from the board).
Must give credit to TaylorVA (Reese Rails) for teaching me this..
Its not a fuse because they work in test. Its a switch problem, you shorted out the switch matrix.
Quoted from Pin_Guy:Do the following switches work?
And the pop switches do not work.
Thanks, that's helpful. The obvious next question is how do I fix it?
This is the rest of the switches in switch column 6 along with the 3 lower pop bumper switches. If you had a logic probe you can tell if the column is being strobed or not. If its not being strobed you probably took out the drive transistor Q6 (2N3904). If you have any working switches its not going to be a fuse, besides this is a 5V matrix and if you blew the 5 volt fuse you would know it. Since you said you zapped something I'm assuming you saw sparks or know you shorted something to something you shouldn't have.
Replace Q6 on the CPU Sound board.
Thanks very much. Yeah, I saw sparks...of shame! ..no, I really did see sparks.
Should I find a logic probe first? or does it matter at this point?
A logic probe would tell you for sure, I can only assume that the driver is blown; you probably can't tell if Q6 is bad by looking at it but it could be shorted from collector to emitter which is something you may be able to measure with your ohm meter. You can compare the resistance of Q6 with that of Q1-Q8 since they should all be similar.
I really did see sparks.
Then take a pic of Q6 it may show signs of a voltage spike.
Yes, I examined the transistor last night after Pin_guy's very helpful post. There's obvious damage..
Looks like the magic smoke leaked out. Have you read Terry B soldering guide? Hopefully Q6 stopped any further damage. Replace Q6 and retest it.