Hello,
First, thanks to all the members who respond answers from the other people, I was able to repair most of my pinball by readings lots of messages.
Because Covid restrictions, I decide to restore my old pinball machines I got a few years ago for mostly free.
I have 3 machines to work on: Stern Trident, Stern Stars and Bally Harlem Globetrotters
Because I'm not familiar with the pinball and low knowledge in electronics, I bought one new set of Alltek MPU and Solenoid driver.
Once the machine will function, I will swap card with the old one. If still work, good, if not i will try to fix the card.

The Trident is almost functional now.

I have a question about the sound card, didn't found lot of information.

I didn't connect the connector to the MPU card,
When powering the pinball machine, the speakers is doing a strange sound, like high cam engine running at idle and little hum.
Is this is normal of sign of problem with the card?
Any things i could check?
As I wrote, I didnt connect the connector, dont want to cause any dammage

Your input is appreciated
Thanks
Jean-Francois from Canada

Thanks for your response, didnt saw your reply, i taught i had received email.

I plug the card, now i have sound but the sound is quite low, sound distort, have hum and background noisy higher than the sound i got each time i hit a target.

I measured 4,9 a tp1 and 15,4 at tp7 (as pin wiki i should have 11.6) didnt found the tp8 and tp9, are they on the sound card?