I was playing my machine earlier this week after flipper rebuilds, and I managed to air ball up under the deadworld... It fell into that well.. and then rolled down to the standard subway exit. So it might have been a safety in case of the odd air ball.

My Dredd has developed a case of gremlins. If the coin door is shut (high power on), the shooter coil energizes as soon as the machine is turned on, and stays on until the F105 fuse blows. I thought maybe the coil was shorted against the bracket, but I took it apart and moved it away from everything and I still get the same behavior.

Also the deadworld motor and crane just run constantly even when in the test menus. If I unplug J130 from the driver board, it no longer blows the fuse, so I know it's something on that power line. I've traced the wires and don't see anything obvious that would be causing a short. I'm tempted to pull the driver board out and start testing everything on that, but not sure where to start.

Looks like Q70 is the culprit. the wires on the plug all test fine, but one pin is buzzing on my meter when I connect to ground. It's the number 9 pin (violet-grey). Touching the metal tab on Q70 with meter also buzzes.

I'd be down for paying for this mod as well. I dearly hope Soren does push out an official rom, but until then....

Thanks for the help. Q70 replaced and everything is working as expected.

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L1AT boot up

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Anyone have a great lakes opto board that they can tell me what size capacitor it has?

I've already replaced it, but I'd like to repair the old one. I hate throwing stuff out that's repairable.

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Sounds like you might have a bad transistor on the driver board. I had a similar issue with the right shooter coil that was causing the fuse to blow. Ended up replacing a transistor and that fixed the issue.

When I got my machine, the deadworld was not working correctly. The PO bent out the guide so that the ball would just drop onto the playfield. 90% of the time it worked. When it didn't I had to pull the glass off to get the ball out.

I just got my rom upgraded from L1AT to L1D. So far the best bonus is that you can actually complete left ramp loops during modes that require it when you have the ball locks activated. When the mode is running, it ignores the ball locks.

I had Matt's Basement Arcade burn the rom for me. Choose a custom rom, select chip 27c040 and either send the binary or give him a link. Meldenhut send me the binary file.

Of note, if anyone wants one, I accidently had two roms burned so I have a spare. If anyone wants it, shoot me a message and I'll mail it off.

My JD is starting to turn into a problem child, lol. Was playing fine yesterday, then all of sudden fuse F105 blew. Now the globe just rotates constantly and if I put a new fuse in, it bangs the knocker then blows again.

I took the board out and checked the J130 pins, and none are holding to ground. The solenoid transistors all test fine. I'm starting to suspect Q1 went bad. Any thoughts on how to test it?

When I last replaced rubbers, I put silicon rings on those posts. They take a bunch of abuse without breaking, and they are cleanable. It does make the subway shot a bit more difficult too, as they tend to stick to the ball a bit more so they don't allow the ball to go in unless you really get it dead on. I kind of like the challenge.

Since I switched to L1-AT, and now L1-D, I've been having a problem that crops up on super games from time to time. If I get all the targets down during super game, and it start shooting all 6 balls out I sometimes get 2-3 balls stuck in the shooter lane. The game will go on until I loose all balls in play then nothing further will happen. No ball search happens, and I just have balls sitting there in the shooter. The only way to get past this is to tilt the machine, at which time the balls auto-shoot and then drain and the next ball starts like normal.

Has anyone else seen this? I know L-7 supposedly had some shooter logic improvements and I wonder if this was a fix for the issue. I really like the way L1-D plays though, other than this.

Matt's basement arcade has it.

L1 was for proto-type machines. You want L1-AT or even better L1-D, which is an un-official release that improved on L1-AT:

https://pinside.com/pinball/forum/topic/dredd-owners-thread-members-only/page/85#post-6658665

I have a copy of L1-D I can send you. That's a custom rom based on L1AT that has some rule fixes.

Mine was doing that at one point. Turned out the ground screws for the boards were loose. Tightening all the board screws to the backplane fixed it for me.

Welp, leaving the club (ish). Had to make roome for Twilight Zone, and my father in law said he would like to have JD. As such, I'll still get to visit it

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The left fire button has two functions. One to select modes, and other is to launch the ball when it gets dropped into the left lane from the Air Raid ramp. It doesn't launch a second ball.

If the ball just happens to end up in that lane randomly, it will auto shoot. It only has you fire it if you've gone up the air raid ramp, and dropped it into that lane.

Pretty much un-obtanium new. However if you call Steve at https://www.pbresource.com/, he rebuilds them. You send in your broken one, with a check for the rebuilt one, and he sends it to you. His work is impeccable.

I ran into this a few times. if the switch doesn't reset it no longer knows that a ball is still there. I'm guessing you are running L1-AT or L1-D? L-7 had some better shooter lane logic to fix this, but of course doesn't do the ring locks.

When I had my Dredd, I was able to mitigate the issue by adjusting the switch so that it released quicker. But it would still occasionally get hung up until I tilted the machine.