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I made some test on roms board and i find ok by then, for some reason i was wrong. I know today the roms boards is bad. Today i test the roms chips with two set and it is ok. I swap the special chip and the are ok. There's few components and will check with my friend electronic frindly or...

No sorry, i my project soon. I maybe try this week !🙂

Thanks a lot for the suggestion, i will replace this chip and see what happen. I also have 0 on the rom board and when the black screen appear the "C"

Hi klovers ! Here's the problem, When powered on it run test, i have normal rug patern and message "all system go" but the second the attract mode start i lost the picture, no message on rom board. Thanks for your help !!

Any opinions !

MH repro cab almost completed. Would like to use a wg6100 + dedicated wiring repro harness + MH pcb that comes from a SD conversion. What to expect, plug and play ? Thanks for advices ! 🙂🙂

Thanks a lot everyone for your help, yes it was a bad 40 pins pia C10 Now sounds are working 100% perfect !

Thanks for the advice, i will remove it this week end !

It does same sounds than a working sound board.

Yes i'm sure switches are ok, i can hear sounds when i install a working sound board.

Yes the test switch on the sound board play 3 differents small "song", same as a working board. I think the missing sounds on gameplay are the same from the line sound test. Is it possible to diagnose this pia before removing it ?

Yes in test mode from the coin door switches, no sounds from the "line sound" test

Hi, i try to fix an issue with a Robotron Williams sound board. Sounds are working when playing but a few missing, some correct and some incorrect/mixed. When i try the sound board test (line sound) from the front door, i can't ear no sounds at all. I suspect pia C10 chip 40 pins. But before i...

Thanks a lot Andrew for this infos. 24 years in this hobby and still lot to learn! 🙄🙄🙄

Problem solved, i would like to thanks everyone for your patience and your help. The problem was the 12v missing. Ok i should have solve this easily but here's what happen, it's strange. First when i power Star Wars, nothing dead. I swapped the ar2 with the one working in Tempest, same...

Thanks you are right there's no 12v, i can see 3 3904 i assume one for each color and another 3904 near that position.

No logic probe in hand, any recommandation? I checked amazon and saw tons of models!

I set up the test bench. Scope set up in xy mode to see the picture of the game. I will look at 14b soon but i don't know for the moment how to diagnose this chip or use the scope correctly. I'm learning, thanks for your help! I have the ESB multigame, i hope it is not damaged. Is it better to...

Ok here's some results Defective board 1 Ohms mode trigger at 200k +15 to ground 1.4 -15 to ground 11.0 Defective board 2 +15 to ground 1.4 -15 to ground 10.7 Working board +15 to ground 1.4 -15 to ground 10.7 I tested C56 and board 1 it's ok, same result as the working board. Board 2...

Thanks for this great and clear explanation! I understand much more how the power supply chain is working now!🙂🙂