(Topic ID: 295296)

Gottlieb MPU replacement by Swemmer Electronics ***HELP NEEDED***

By J_Striker

4 months ago



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  • Latest reply 4 months ago by G-P-E
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#1 4 months ago

Looking for some help, I emailed Swemmer electronics and getting I reply back.

I had someone reach out to me to help fix their Diamond Lady. They said they had a new MPU installed and everything was working, moved from NY to NC and now game will not boot. There are no manuals for the board and I have never messed with them.

Game will power on and GI comes on, no display lights and the only lights that are sequencing are the 4 or 5 spade insert lights that will blink down the line, but that’s it. All the led lights on the MPU are lite up as if it is working correctly. I checked all connections and reseated all chips and same issue.

Thanks for anyone’s help

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#2 4 months ago

bumping this again for any help

#3 4 months ago

Check all the voltages on the power supply. It's possible the display or other voltage is out.
Have you checked all the fuses in the cabinet? People assume that nothing happens in a move but it can cause problems to surface:
Loose fuse clips can make fuses fall out.
The destination may have slightly higher or lower mains voltage.
Basically what I'm getting at is something has changed (location, environment, time) so it is possible a fuse has opened.

#4 4 months ago

First suspect; MPU voltage / power supply. (Check for +5V ----- +5.2V max.)
Slam switch in coin door............
Reseat all fuses, check solder connections..........

#5 4 months ago

Put a Swemmer board in a Monte Carlo and it didn't work until I upgraded the 5vdc supply ....I had the old style one same as the one you have shown in your pics ...new one cost 65 bucks and you have to set dead on 5 volts on the Swemmer MPU card. The Swemmer card draws more current then the original MPU

#6 4 months ago

With at least 23 LEDs and if using about 10mA per LED then his board is wasting nearly a quarter of an amp just lighting LEDs. On an old power supply that was already nearly maxed out - this extra load doesn't help.

#7 4 months ago

I see an auxiliary supply power board and a regular power supply board.... both capable for Diamond Lady.... do I just need one or both?

https://www.marcospecialties.com/pinball-parts/MA-767

https://www.marcospecialties.com/pinball-parts/MA-645

#8 4 months ago

I really wish Marco would revise the "Features" and "Specifications" on the board in the 2nd link. Their listing was verbatim lift of text from my System 80/80A board's listing and does not apply to this reduced capability board that they have listed.

Anyways, to answer your question - board 2 will work.

If you need to replace the power supply then you would need to replace the one in the upper left hand corner of your 5th picture. Skinny board, large black heat sink with two cables going to it. The replacement would be board #2 in your links.
But first make sure you really need to replace it. Did you measure the voltages as mentioned by others above? $70 is quite a bit to pay if it doesn't help your problem at all (e.g. problem ends up being bad connector contacts). Measure the voltage directly across that yellow capacitor on the left side of your CPU board. You said problem started after game was moved -- that problem screams "Connectors!".

And reseat the EPROM that appears to be popping out of the socket in photos 2 and 6 above.

Hey there! Got a moment?

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