Do you have power at the coils?

There will always be power.

Ground the black lead of your meter, set it to DC and then put the red lead on the lugs to the coil. Should see around 28v on both sides.

If you don't have power it's probably a fuse, if you do the buffer chip that drives the 2n4401's is probably fried. I'd bet my money on the fuse.

Your transistors were probably fine honestly. The current path would've gone from the power supply thru the ground strap and not back to the board. That's why I think it was fuses.

Yeah this is bad. You're losing voltage to the coils. Check the fuses on the Aux power driver board. F1, F2, F3, F2A, F2C. Buzz them out with your meter. One of them is bad. Also reseat connector J11 on that same board.

You get to use one of the most common phrases when selling a pinball....”hmmm?? It’s never done that before”

Recheck voltages with the new fuses? Did you test the old fuses so you'd know which one(s) might be blown?

With game off, did you check continuity on the purple yellow power wire from coil to coil and to the backbox?

You likely destroyed a trace on the back of the Aux Power Driver for power to those coils.

And I agree with others, replacing all those drivers was completely unnecessary.

--
Rob Anthony
Pinball Classics
http://LockWhenLit.com
Quality Board Work - In Home Service
borygard at gmail dot com

There's one fuse you might not have checked because it's totally hidden under the playfield. If you raise the playfield and look near the center (both width and length of the playfield) you'll find a fuse/holder mounted behind a nest of wires. As far as I remember, that fuse protects the coils you are having issues with. It took me a while to find this issue when it happened to me but once I found that fuse and changed it I was all fixed up! Good luck and let me know if that was your issue.

Eric

It's VERY hard to see...you might have to move the wire looms around to actually find it. It's a single fuse holder that is typically mounted to the playfield but mine was loose. You'll find it, it's there...It just might take 30 mins of staring in that general vicinity. Haha

I grabbed this pic off Google and it’s a prototype but it should help you find where that fuse is. It’s hidden in the area I circled just behind the “Teams” lamp boards and before the drop target assembly. Good luck!

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GREAT NEWS!! I was so frustrated when the same thing happened to my Rollergames. I was at my wits end trying to trace what I thought was a broken wire under the playfield when VOILA, there’s a hidden fuse!! So glad to hear you’re up and running again!

Happy flippin’,
Eric

Apparetly Eric is the man. I owned a Rollergames and didn't even know that fuse was there either. That said, this is a great example of why you should always start at the mech or lamp that isn't working and work your way back towards the boards. Following the wiring schematic back SHOULD have shown that fuse existed, I would think, and testing the lugs at the start would've indicated there was not the proper voltages.

Also, if you ever run into something like this again, you can check for those voltages at the pins on the board itself as long as you're careful not to short them! That would've also eliminated the blown trace theory, I think. Though that was a good suggestion..I've totally had traces blow clean off the board near the big caps on a WPC power driver before...that was fun to figure out.

I know Earthshaker has a fuse under the playfield near the bumpers. Never owned a Rollergames, but I should probably check my other System 11 era games and see if there are any surprises.

For future reference - http://www.pinwiki.com/wiki/index.php?title=Rollergames#Several_Solenoids_Not_Firing.2C_But_All_Auxiliary_Driver_Board_Fuses_Test_Fine

And, if you own a Rollergames, it wouldn't hurt to get the updated flasher map. I pulled my hair out trying to find what was what, so I remade that page - http://www.pinwiki.com/wiki/index.php?title=Rollergames#Updated_Solenoid_Flasher_Map

Jim

And really important rule don’t be raising and lowering PF especially sys 11 games with power on. Glad you found the problem and it was not a serious issue.

I recently picked up a Rollergames. I will remember that there is a deeply hidden fuse under the PF from this thread. Good stuff to know! Great under rated game too.