I'm assuming you mean Coffin Multiball? It's possible something has shorted (either under PF or on a board somewhere) to lock the coil on.

I would disable all three magnets under the pf and test them out one by one or else you might just burn out fuses without being able to troubleshoot anything if something is latching on. If you're sure its the coffin magnet, disable the power to it and play on and see if the other magnets work well.

Possible. It could be shorted to ground through a number of sources. I'm not familiar with how often Stern boards have issues like this or how the circuits for the magnet(s) work exactly so to simplify it to 'Transistor' is a bit premature, but possibly valid.

There's a magnet control board under the PF as well that may or may not control how that magnet grabs and could also be suspect.

Since I am a noob, im going to replace the fuse and go from there, if it happens again, Ill contact stern, as I dont want to void my warranty by disconnecting stuff.
Thanks for your help!

In my opinion you are risking more by just plugging a fuse in and turning it on again. If you are worried at all, call Stern BEFORE doing that. Fuses are nice circuit protection, but they need overcurrent for a time duration, and they are not a guaranteed failsafe for damage.

Disconnecting the magnet is one plug under the PF if I'm not mistaken and it shouldn't void anything by plugging and unplugging it. People were having coffin magnets overheat bad awhile back and it's as simple as unplugging it from power. If you DON'T unplug it, putting a fuse in and having the problem repeat again puts the magnet at risk again.

Bottom line: I would call Stern before doing ANYTHING, or I would disconnect stuff and try troubleshooting (as I believe this is what Stern will get you to do anyway but may be better directed by them in your case).

Good to hear. It could be one of those ghosts in the machine. Maybe code related?

I do think its good you called. For me personally I'd have gone ahead with tinkering and replacing fuses but at a consumer level it's best if you call to ensure your warranty and servicing are aligning.

Feel free to talk to stern after the 60 days as well. They have a very good track record of customer service post-warranty

Funny I just saw this post this morning...

Last week, I turned Metallica on to play some games, and I noticed during what should have been a MB the magnet never grabbed the ball. I pulled the glass and activated the other MB, and no magnets were working. Pulled the translight and the fuse (F7) was blown. Changed the fuse and all was good played alot of games on it since then. Last night was playing a game, started Electric chair MB as normal, then during MB the coffin magnet grabbed the ball and held it, and it said ball is locked. It never hammered or dropped, but just held the ball then released it. I continued to play, and got cross MB, I got the MB but the magnet never grabbed the ball and held it. The fuse had blown again. I don't know what is causing it to blow but it seems odd that it has suddenly started this, and also to know that someone elses game is doing it as well?

Phoebe

Keep us posted in what you find, just in case others go through the same problems, it will come i handy

I'm serious. Call Pat at stern if you have problems. You'll be pleased.

I have an issue with my Opto board by the cross in the grave yard drop targets. Doesn't activate. If I switch the ribbon cables of the cross optos with the electric chair optos on the board the cross works. I am thinking its the board. Called Stern, they got right back to me. They are sending me a new opto board and optos. Stinks that a brand new game fails but I can't really ask anymore from Stern's customer service. With the three or four other issues I have had with the game the customer service has been great also. Wish I could say the same thing about programming the new code. lol

My game is now continually blowing F7 fuse on METLE. Did anyone ever figure out why this seems to be a problem? I didn't have any issues with it until the recent big code update.

Actually I hadn't had time to try a new fuse again until today, and alas, it just keeps blowing the fuse when turned on. Time to try and troubleshoot by unplugging shit. Ugh. Has anyone else figured out what is happening with this? It doesn't seem to be isolated to just my game.

Did you ever figure out the problem? I am having this exact problem.

It happens right away. I tried it twice. Plus the original. Did a visual inspection of the machine. Not seeing anything obvious.

Hopefully someone can chime in on how to trouble shoot.

Have you contacted stern yet?

I had this problem as well.
Don't keep replacing fuses until you check the magnet opto board.
Lift the play field and check the magnet opto board by the coffin lock. The large white resistor(I think its a resistor) has been known to snap off at the PCB which causes the coffin magnet to blow F7. If I can Find the broken one I can post a picture of what to look for. If you are handy with a soldering iron you can fix it yourself, or hope that Stern will send you a new one. (Mine was two months out of warranty, but they sent me a new magnet and a new board anyway. Thanks Stern!)
Good luck

Cool. I am going to check that board and go from there. I am going to call Stern today.

Thanks for your reply
Danny

Pat from Stern had me check by taking a ball and hold next to a magnet. Turn on and off quickly so not to blow the fuse. The coffin magnet held the ball. Long story short, as Buffaloatx had stated, Pat is sending a new magnet board. "Bad resister"

Thanks to Stern for sending new board without routing me through my distributer and even though my warranty is expired.

Hope you didn't burn your magnet up like I did, because replacing that thing is a real Mother F....
Seriously, I will buy a whole new assembly before I ever attempt that again.
Good luck with the boards guys, Flip ON....

Mine all 3 magnets just stopped working just tonight. Coffin magnet held the ball for a long time without the hammer coming down. Then noticed NO magnets were activating as I was playing. What do, check first? Thanks

1. Read *ALL* the posts in this thread you just bumped.

2. Remove fuse F7 and test it with a meter.

My first blown F7 this morning. My PREM was manufactured Aug 22, 2018. Everything looks fine on my MAG board visually..

Any update on what you found out ?

Happened to me once too. I replaced the fuse, everything worked except the magnet board. I contacted Stern, they sent me a new magnet board. Hasn't happened since...