Hi all. I’m a newbie here and just bought my first pin (Big Guns) on Monday. It seemed to work just fine at his place (except for the invincibility light would never shut off so it was removed). I play tested all the switches. Sound, display, cannons, kickers, drop targets all worked. Only issue seemed to be the one light bulb. Drove home and set up. Everything still worked fine.
Drop target banks at the top “reset” four times (every time) upon start-up which I thought was odd, but since they worked, I let it go.
Less than 24 hours later, the left gun would not load. Right gun still worked fine.
Then the center “king” playfield “gun” would not fire into the shoot. Then both drop target banks quit resetting. Now the right gun will not fire when you load the second ball on the right side (loads once but won’t fire). All audio and score board plays as if the mechanical guns sequence was working. Bagatelle still works too.

Previously had codes for all drop targets on the top left bank but those cleared after I cleaned them (item 2 below). Now I’ve got a switch 45 code that I didn’t have before. I think that is the Kings chamber far right switch.

What I’ve done so far with no change:
1. Unplugged and replugged all connectors in the head.
2. Removed the drop target banks, cleaned and reassembled them. (Both banks have new blue lake boards in them. The original Williams boards came with the machine.) Both banks were real dirty and I tightened the springs a bit. Manually, they work perfect. Just no power to the solenoids (didn’t meter them though as I don’t yet own one.)
3. Carefully vacuumed the cabinet and head.
4. Resoddered a diode that was broken off the top right flipper (which worked fine before and after)
5. Checked all fuses.
6. Checked the physical switch connections visually to see if they made contact (they did).
7. Restet the machine to factory settings using code 70.

I have the complete manual with schematics (not sure how to read them yet)

Seems like someone might have been trying to upgrade the machine as many bulbs are LED, but not all. Five bulbs are missing completely.

Not sure what to do at this point because it seems like a bigger issue than just a coil or something simple. Worried an entire board or more is failing. Are these things all related?

Also, it does still have the original battery holder for high score memory and it looks perfect with no signs of leaking.

Any advice would be greatly appreciated. My four boys keep asking “did you fix it yet daddy?” And I’m starting to develop a sense of “did I just get suckered on my first machine?”

Happy Thanksgiving everyone.
-Jesse

No, I didn’t meter anything yet as I don’t have a meter. I visually inspected them. Only ones that looked odd were the two 1/10 amp fuses. I removed those and they both look the same with a very thin filament and then about a 1/4” of microfiliment off centered.

I will purchase a meter tomorrow... Black Friday special?!!
Dozer 1, also checked the J8 connector. Looks perfect.

Thanks for the ideas... please keep them coming. I really appreciate it!!

6C694A97-C856-41CB-98E7-84C51CECE5D1 (resized).jpeg

Just pulled batteries out, pulled J8 connector out and put back in (all while unplugged) and turned machine on. NEW message now. Only says “Adjust Failure”.
So, there’s progress... one way or the other )
Of course, I don’t know what this means.

8C8E4246-B8F2-4AD7-8CB5-0C9F2CAE4680 (resized).jpeg

Just put fresh batteries in and message remains.

I do have a manual, but don’t see anything in the “game adjustment procedure” section titled “adjust failure”

What should I be looking for?

Alright, here’s the status:
(Need to purchase a meter yet tomorrow but did everything else listed previously in this thread.

Learning lots and appreciate all the advice. Means a lot as I’m new to this community!

1. Right cannon will load but not fire.
2. Left cannon will not load.
3. Center “load gun” triggers audio/display sequence and bagatelle but will not fire back out.
4. Both drop target banks do not pop up.
5. Red troll guards (behind drop target bank) stay lit all the time.
6. There is no “triggering of solenoids to eject a ball trapped on playfield. Not sure if that feature is part of this game.
7. Relay 1 is continuously clicking. (See photo of relay).

72F1B3BD-00C3-4999-BC0C-2479D365CDD9 (resized).jpeg

The bulb is a 28 volt and removed. The plastic is already slightly melted on the underside (was like that when I bought it), but doesn’t affect the playfield surface.

Feel like the volt meter is going to be used all lot. Any recommendations on brand or feature list I should be looking for?

Alright guys... we’re up and going again!
Thanks for everyone’s ideas.

My background in fuses was in the automotive world. When they blow, it’s pretty obvious.

These slow Blow fuses look a lot different when they are bad. I’ve got a meter now and now I’m going to try to go through the machine and figure out the lighting issue.

Super happy and my boys are busy wearing out the flippers again.

0C68E705-3C03-4D6E-8033-3D61879B8625 (resized).jpeg

My father in law (who brought his meter over today) has been a mechanic his whole life and also sells/services electric golf cars. He said some of the fuses looked like they might have been “warm” because the connections are dirty. He said shining them up with some scotch brite would ensure the fuses have good connections and won’t get warm like that. So I’m going to do that next.
Also played about 30 games since the new fuse and all is well. I even made the 3rd place top score... which I’m sure is laughable for most of you reading this thread.