Getting error messages "check opto switches 81,82,83 & 85." These are the 3 supercharger optos and the last opto made switch.
The game is blowing fuse 103. I tracked it down in the manual and have determined the fuse will only blow if any or all of the superchargers coils are connected. If however I disconnect connector J6 on the accelerator board fuse 103 will not blow even if one or all supercharger coils are connected.

Connector J6 is for power and drive to the supercharger coils. I'm kind if stuck on what to do next. Check continuity of the J6 wires to the supercharger coil wires? Any help would be appreciated . Thanks.

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Forgot to mention I did try and swap a known good accelerator board but did not help. The boards LEDs 3 are not coming on which I'm pretty sure they should. If it's sending power to the coils the lights should be on .. I am getting 73 volts at each connector that need to get plugged into the supercharger coils. This should be only 50 volts according to the manual.

Hi Grumpy. With J6 disconnected and game power off I put VOM ground lead on ground strap. The red lead I placed on each J6 pin on board. I am indicate. No resistance. I also noticed J 5 connector is now black. It was not like that when I swapped it in but the board I took out had the same burm area .

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On accelerator Board with game on J6 pins 1,2,3 I am reading 74 volts for power to coils. J6 pins ,5,6,7 which is coil drive is reading basically nothing. Millavolts. I'm guessing coil drives are the power for optos.

Getting no continuity on these three pins . What should I check next?

Did some research and I need to get the optos working for supercharger cooks to work but don't know how to fix the optos. 12 volts are leaving the accelerator board but I have no voltage at the optos .

Ok will do. How do I do that? Set on ohms and check to see if have continuity between transmitter top and the legs? What's weird is I swapped in a known good accelerator board .. But ok . Thanks Grumpy

Oh I get it ... You're saying I damaged the known good board when I installed it. Damm

I put black lead on cab ground strap and red lead on center leg of all TP 36 transisstors. Q9 beeped for continuity. The other transistors did not. Did same thing on spare board outside the game. None of those transistors beeped. I ohmed all three supercharger coils. They all read approx 3.3 ohms.they all beeped for continuity and no short.

Accelerator board seems to have Q9 controlling supercharger #2 but they are all reading same ohms. I'll recheck them.

Accelerator board schematic has Q9 controlling #2 supercharger coil but all coils are reading pretty much the same ohms...

All coils reading 3.3 or 3.2 ohms.

Used cab ground strap for black meter lead. Red lead to each J 6 wire at connector. Reading O.L. At all wires.

Interesting. I have a spare magnet / opto harness. I connected it yesterday and F103 still blew. This tells me the harness shouldn't be the problem. I have two spare magnets. Maybe I could try switching them out but fuse will blow if any magnet is blipped in with j6 connected.

Also the original board Q9 is not showing as shorted... Crazy. ..

Does F103 supply 12volt power to the accelerator board?

I'll look over the J6 wiring up to the coil/opto harness...

I have both boards out of the machine. Can you tell me exactly how to test the transitors? I think I am doing it incorrectly.

O.L from pins 2 to 3 on all of the TIP 36. This means they are good correct?

Q9,Q6,Q3 all read OL from leg 2 to 3.

Ohh. Oops. Ok.

I will follow your PM instructions. Thanks for your efforts and hopefully it function again.

Accelerator board needed repaired. Also Had too many mods running off j 118 . Repinned J-118 connector . Repinned accelerator board connectors. Thanks to Pinsider Grumpy optos and supercharger coils are working. Hope this helps someone .

That’s awesome!!

Great to hear. Love this game.

Separate power supply is the way to go.