Hi all, I just picked up a Gottlieb Hot Shot that was apparently a re-import from Germany. Previous owner had not tried to turn it on or do anything with it. Anyway, I'm trying to figure out what I need to do to get it working in the US and I am in over my head.

The first thing I ran into is a mystery box:

The line cord enters this box. Black wire then goes to main 5 amp slow blow fuse. Blue wire goes to COM on the transformer. Yellow is grounded on a transformer leg.

mystery (resized).jpg

There is also a free floating wire attached to this leg of the transformer, as well as 1 other wire that goes to the main wire harness.

wire (resized).jpg

Here's a picture of the full transformer (there are no wires on the other side).

transformer (resized).jpg

I notice that the 230v is unused and that 2 115v are used instead. How will I convert this to a single 115v for the US?

I picked up a B-3235 Gottlieb transformer.

UST (resized).jpg

But I have not found any info on how to wire it up. I noticed the schematic calls for a 6831...will I need to get that instead? It looks like the difference might be a second 6v line? Relevant portion of the schematic schematic (resized).jpg

Thanks for the help! This is my second EM and the first that will need more work than replacing a relay.

Hi Rolf! I am not sure how to tell whether my score motor is 50 hz or 60 hz. Is there a place on the motor that will say? I cannot see a part number listed.

Yes there is a 6VAC solder lug on the US transformer but only one. It appears from the schematic that there should be 2 6VAC lines. One white and one white/black. So perhaps the transformer I purchased won't be able to power all of my lamps. The schematic calls for a B-6183 and I purchased a B-3235.

Here is what I think I need to do...but as you can see I have a few I am not sure of:

transformercombined (resized).jpg

Super helpful info on the radio interference filter. Unfortunately my game does not have a voltage select jones plug. That would have made my life a lot easier.

I also figured out the weirdness with the 3 wire from the line cord. It looks like a previous owner had started to set up a ground but hadn't wired them up to anything. One wire goes all the way through the harness to the coin door. The schematic does not have a ground wire listed. I will purchase some ground braid to finish this project.

Thanks for your help!

The original transformer is a 7986 so I suppose I don't need the new one. Thank you for your help so far. Does anyone have a diagram to help me make sure it is wired for 115?

The motor is unfortunately the 11550 50 Hz. I suppose I will have to figure out what to do about that once I have the transformer figured out.

To revisit my original picture of the transformer:

transformer (resized).jpg

Does this look like it could be the correct wiring for US? To me it seems like there should not be 2 115V lines but I am definitely not knowledgeable about this. I realize that the picture doesn't show a white wire connected to a 0 lug behind the black/white ones on the right side.

Hi Rolf, I asked a local group about wiring this, and they were able to help me out. My picture does not show that there is another lug (marked 0) on the bottom. This lug is #3 in your diagram. I think if I had taken a better picture this all would have been easier. Thank you for your help regardless! You have helped me gain a much better understanding of transformers.

I now have power to the game, but it does not want to score points. I will continue troubleshooting and start a new thread if I need more help.

Thanks again.

Unfortunately that's the same 50 hz motor that I've got.

So I am now able to start a game. Scoring features are working but the score reels are having a hard time going from the 9s-0s positions.

For Player 1 my 10,000s reel is working well

My 1000s works great until the 9-0 transition.

Same for the 100s reel.

They both struggle to reset (the 100s has thus far required me to manually move it from 9-0).

I have already removed the reels and cleaned them up with alcohol. As far as I can tell the mechanisms are working well. When I manually activate them they work fine all the way through from 1-0.

I had started trying to de-tension the switches but I am wondering if part of the problem could be the motor and perhaps I should wait until I get a new 60 hz one. Anyone want to chime in on the effect of an out-of-phase motor on score reel performance?

Sounds like I need to do some more work on lowering the switch tension then. Painful.

This is what I am concerned about with my current issues with the 1000s and 100s score reels. But the 10,000s reel resets and scores correctly. To me that indicates that it should be possible to have the game work with a 50 hz motor as others have said above, the tolerances for the score reels might just be tighter.

For now I am going to chase down a few other bugs (locked on 10 pt relay, bonus not scoring, and ball and player counts not always advancing correctly) and come back to the score reels later.

This game has been an interesting experience as a first EM major project, but I am making progress and have already learned a lot thanks to the advice I have gotten here.

Well I have the 1000s reel working correctly now. But the 100s reel refuses to cooperate. Does anyone have any tips for adjusting it? Thus far I have:

Cleaned coil plunger
Cleaned underside
Removed dried lubricant from gear
Switched spring for a stiffer one
Switched reels with P4 reel

The hangup seems to actually be going from 8-9 rather than 9-0. I know the switches go from all but middle runout open to all closed but it doesn’t make sense to me that it would be harder to go from 8-9 than 9-0.

I removed a plastic white spacer from above the reel below the clip/washer and the 100s reel is now working perfectly. Wish I hadn't wasted so much time messing with the switch ratchet trying to de-tension it. You live and you learn.