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prefabpeti

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I have a Sega JVS IO that is being detected by games. Coin counter and mechanism is connected and working (luckily an old £1 coin was in the machine!).

However if I load the BIOS menu up with the TEST button (on CAB), the SERVICE button doesn't work (in the game it adds a credit). If I try the buttons on the motherboard, its the same. If I unplug the JVS IO from the motherboard, the SERVICE button on the motherboard works again. I'm also finding the START button won't work either. Somehow the game has gone in a couple of times and it seems to register some presses, but it's rather random.

I did check without a game in and its the same. I mostly want to see the IO menus and test all the buttons.

I had to dismantle the machine to get it in my house, but I'm pretty confident I've hooked up everything bar anything screen related (as I don't have a tube or chassis).

Has anyone else had this problem? Am I missing something?
 
I would look for short circuits on the cables, but i guess something is wrong with the I/O.

Do you have another I/O PCB available?

Provide some Photos of the PCB (with plugged in cables) maybe we see something which causes the issue.
 
Sadly I only have another Sega JAMMA IO - that's working fine.

I have used a DMM to confirm the wiring looms have continuity.

I did some playing and found hitting the service button does eventually respond when I tried with my N2 (its incredibly laggy). It seems the N2 also behaves differently as games don't detect the IO. However I was able to get into the INPUT TEST on the BIOS finally where it sees it. The attached is with digital and analog bundles disconnected.
20230409_184118.jpg

I'm fairly sure my IO is busted now. I've attached a photo of it all plugged in just in case (both LED are on).

20230409_135325.jpg

Thanks for the advice though!
 
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