(Topic ID: 236862)

Help needed! Gottlieb Gladiators won’t boot


By jmountjoy111

7 months ago



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  • 41 posts
  • 4 Pinsiders participating
  • Latest reply 6 months ago by Impzilla
  • Topic is favorited by 1 Pinsider

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#1 7 months ago

I picked up this gladiators from a friend of mine locally that has had the machine for years. The game used to work as I played it at his home last year. The game was moved at some point by the previous owner and the head was taken off to move it. Upon reassembly he told me that he got two plugs crossed up on the boards. He said there was a huge puff of smoke when he powered it back up. He realized what plugs were crossed and put them back but the damage was obviously done. It burned the 20 pin ribbon cable connecting the driver to the cpu. I replaced the cable and am attaching pictures of what the game does when powered on.

Obviously there must be some serious board damage. I am pretty good at doing the repairs but am not very familiar with gottlieb at all and this will be the first system 3 I’ve had to repair. That being said I am needing some help on where to start. I do not have a manual for the machine so no schematics. I’d greatly appreciate some nudging in the right direction as I know most of you guys know way more than I do.

I am attaching some pics and can take any more that need to be taken. The plugs that were crossed were j1 on the power supply and p1 on the driver board.

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#2 7 months ago

Bump for the morning crowd. Anyone have any ideas of where to start?

#4 7 months ago

Well that stinks. I don’t have any way to burn the ROM. Is there someone who sells them? What type of damage is typical? I know that connector that was mixed runs through the driver into the cpu. Does it usually just destroy both boards

I did find a rescue 911 manual in my box of manuals that has schematics

#6 7 months ago

I unhooked every single connector from every board except the small power board. When I turn the machine on it does read 5v at any of the outputs on that board. It reads 0

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#8 7 months ago

I have 16.3 v to pins 1 and 5 and .25 me to pin 4. I checked it with the plug removed from the board. Here is the schematic from the rescue 911 manual.

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#10 7 months ago
Quoted from ralphwiggum:

Those voltages look okay... ohm out all the resistors and see that their readings match the schematics. Plug that lower connector back in, and try turning the adjustment pot... see if you can get the 5 volt output to move at all on the upper pins coming out.

For some reason my meter only wanted to read in kilo ohms but it .387kohm for r1 and .216 kohm for r2. R3 is the pot itself and it read .414 kohm.

I adjusted the pot both directions and tested the pins at j2. They all read 0 vdc.

#12 7 months ago

I have the ground clipped to the green and yellow ground coming from the cabinet. I added a pic to make sure it was in an ok position

Do I pull the power board to check that leg of the lm338k?

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#14 7 months ago

It reads 0 vdc so I guess that means order a new regulator?

#18 7 months ago

Thanks for that. I will check the traces tomorrow and order the parts. I’ll rebuild the board and then post back when I’m done.

1 week later
#20 7 months ago

So..... I am still waiting on the lm338k to come in. The tracking says Monday

1 week later
#22 7 months ago

So, after waiting for what seemed like forever… The voltage regulator finally came in. I rebuilt the power board and now have +5 VDC to every pin on J2. What do I do now?

#24 7 months ago

I just want to make sure before I plug them in that these are the ones I need to plug in. I have the ribbon cable connecting the dmd controller and the mpu connected as well as the ribbon cable to the dmd from the controller. Do I plug in both p1 and p2 on top of the controller board and p1 on the mpu

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#26 7 months ago

I still get the line across the dmd. Led1 on the mpu flashes. Led1 on the dmd controller is locked.

#29 7 months ago

The voltage on p1 going into the mpu is correct. The voltage on the 5 and 12 pins on p1 into the controller are only reading mv so no where near 5. Maybe I’m checking it wrong

#31 7 months ago

These are the ones I’m seeing. I’m not great at reading it but I tested pin 1 and 4 on p2 for +5 and +12 and it was mv

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#33 7 months ago

Pin 9 reads 5.

Pin 5 only reads 1.2

#36 7 months ago

Yes I think I get it.

So I probably need to go ahead and replace that bridge and the cap inside the cabinet?

I at least feel like I’m getting somewhere wth it. I am going to have shoulder surgery on Friday of this week which will put a bit of a delay in my going much further until it is healed.

#38 7 months ago

I will test the bridge rectifier tomorrow as soon as I get home from work and post what I find. I really appreciate the help

#39 7 months ago

I got swamped the last two days trying to get things lined out at work for me to miss tomorrow for surgery on my shoulder. I am not going to get to check this bridge till after I heal up a bit. Hopefully it won’t be too long. I really do appreciate the help

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