(Topic ID: 320390)

Nuova Bell COBRA pinball repair

By cfh

3 months ago

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  • 12 posts
  • 4 Pinsiders participating
  • Latest reply 3 months ago by dvs626
  • Topic is favorited by 1 Pinsider


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#1 3 months ago

Have a Nuova Bell Cobra pinball from 1987 that does not work. It was designed for 220v, have that all handled so it's running with proper voltages at 120 volts. Also the power board in the backbox has the infamous "black box" voltage regulator replaced with an LM323. So that seems to be OK.

But the game won't fully boot. I get 6 LED mpu board flashes, but then it stops...

Does anyone know what the flash codes represent? i suspect it's Bally like... and yes there is coil voltage (if it's doing a Bally -35 check for coil voltage)... but i can't find any flash code information anywhere on the Web. Does anyone have this info?

Leon at one point was working on this, and a Test EPROM for the mpu board. But i can't find that info any where either.

[email protected]

#2 3 months ago
Quoted from cfh:

Does anyone know what the flash codes represent?... i can't find any flash code information anywhere on the Web.

The MPU LED flash codes for Nuova/Bells Cobra are exactly the same as Bally - they basically ripped off the Bally design.

#3 3 months ago

thank you!
is there any documentation about their flash codes?

#4 3 months ago

Schematics show 2 pias?

First flash=rom checksum pass (this ALWAYS passes, looks like they have the check NOP'd out)
Second flash=main ram check
Third flash=nvram check (although based on the cursory look I took in pinmame, there's more ram in this game vs. a bally)
Fourth flash=pia check
fifth flash=pia 2 check
sixth flash=display interrupt check
seventh flash=zero cross interrupt check

So same as bally, in fact, it's the bally code stolen from one of their games and hacked.

Some more indepth analysis could probably reveal which game or at least family of games.

#5 3 months ago
Quoted from slochar:

Some more indepth analysis could probably reveal which game or at least family of games.

The power on self test looks like Bally system ROM -52 / -53. You can see it in the battery backed RAM U8 test.

Nuova/Bell were doing their own releases of Bally games and modified the code for extra display digits. Then they started making their own playfield layouts, one of them using Eight Ball Deluxe code as a base and got more into coding mods.
Then they moved to their own boardset which was just enhanced Bally-35 architecture (more RAM/ROM support).

#6 3 months ago

someone sent me a wayback link to the leon info on this. I have done some light updating of the file, and will do more later....

#7 3 months ago

i updated the bell website with new pictures of the boards. Leon's pics were pretty old and small. just trying to make it easier to look at...

#8 3 months ago

Does anyone have a real schematic to bell Cobra?
that thing on IPDB is junk...
thanks! [email protected]

#9 3 months ago

Got the 1987 Bell Cobra working tonight, it will be ready for the Ann Arbor VFW pinball show. What a freakin trip that game is! The thing plays "Don't you want me baby" by Human League. Also interesting ball load for multi-ball play. Who would have thought??

2 weeks later
#10 3 months ago

Hi cfh, I too have a Bell Cobra that I am working on bringing back to life.
Would I be able to trouble you for some pictures of the wiring on your working game?

Thankfully I am grateful that I have most the playfield elements on my game.

Hope to hear from you soon.

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#11 3 months ago

need to know exactly what you need

#12 3 months ago

Hey cfh, I had a bit of a read of the page you mentioned you did some light updates to http://pinrepair.com/bell/ (Thank you for updating)
I noticed that the schematic of the Power Module had more information than the previous one I had found around the CNT1 area.
I had already assumed that the boxes and numbers down the right hand side were going back to the Solenoid Regulator Board - Power Module pins but there was no headings written on the schematic to indicate this so I was uncertain of my translation.

This is my first restore project and I've thrown myself in the deep end with getting a machine that needs re-wiring, also fairly new to reading schematics at the moment so I thought photos might help me clear this up, hence why I asked for photos earlier.

Its amazing how a couple of extra written points can clear up some of the confusion I was having around the wiring. I should be ok now I think.

I would love to see any photos you have of your Cobra if your happy to share? The more photos I gather the easier it will be to get the right direction to get mine back to original condition.

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