[Solved]Issue with COIN1 Wire on SEGA JVS REV3

[freddiefiasco]

I have a SEGA JVS REV3 board that is showing some odd behavior.
In test mode, the normal behavior I should be getting for COIN1 is '0000'. As I trigger this pin with a switch, the value is incremented.

Unfortunately, when I power it up I get the value of '8000'. Triggering the pin with a switch does not change the value.

Can someone give me a hint as to what might be causing this behavior?

COIN1 (Yellow/Blue) on the switch is wired to PIN45 on the JVS board.
Other wire on the switch looks to be wired to +5V according to the diagram.

This leads me to assume that COIN1 needs to be linked to +5V to register.

Am I missing something here or is there a loose/disconnected wire causing COIN1 to show '8000' instead of '0000'?

Both setups read ~5V.

 

[PascalP]

usually your coin mech connects the coin1 (pin45) to ground, the coin counter needs 5V

 

[invzim]

The JVS command returns 2 bytes, but only 14 bits are the count.
The two upmost bits is a status field. From my notes:

0	Normal
1	Coin jam (still coin present)
2	Counter disconnected
3	Busy (during the process, such as a card system)

So it's telling you counter is disconnected.

 

[freddiefiasco]

If I ground PIN45 it should show '0000'?

 

[nam9]

I believe you need to spoof the coin meter by connecting the coin meter pin to 5v through a 100ohm resistor.
I can't find the image I want to show here, but this is the idea:



Taken from JammaPlus

Edit: Found it.

 

[freddiefiasco]

The JVS command returns 2 bytes, but only 14 bits are the count.
The two upmost bits is a status field. From my notes:

0	Normal
1	Coin jam (still coin present)
2	Counter disconnected
3	Busy (during the process, such as a card system)

So it's telling you counter is disconnected.

This makes the most sense. I failed to check the voltage going into the counter. I will check this today. Thanks @invzim!

 

[freddiefiasco]

I believe you need to spoof the coin meter by connecting the coin meter pin to 5v through a 100ohm resistor.
I can't find the image I want to show here, but this is the idea:



Taken from JammaPlus

Edit: Found it.

I will probably do this if I can't get my coin meter connected properly. As I have an actual coin meter, I will troubleshoot from there. If worst case, I will spoof it. Thank you for the suggestion @nam9

 

[freddiefiasco]

Works now. Thanks all

 

[poekiepoekie]

...and almost a year later this post helped me as well. Many thanks!

 

[mR_CaESaR]

...and almost a year later this post helped me as well. Many thanks!

Almost two years on, it's just helped me too!

I didn't have the coin counter connected in mine

 

[adgenet]

According to the Sega Naomi Deluxe Universal cabinet manual, they're supposed to be 120ohm 1/4W resistors, not 100 ohm.
https://wiki.arcadeotaku.com/images/6/6f/Naomidxschem.pdf

Of course this is a different board, but it's the only actual documentation I've seen straight from Sega regarding the coin meter bypass.

 

[mR_CaESaR]

...and almost a year later this post helped me as well. Many thanks!

Almost two years on, it's just helped me too!

I didn't have the coin counter connected in mine

Well I spoke too soon!

I have no idea why it's being so temperamental, but I can't get the coin mech to work again.

Sometimes it's 8000 in the JVS test, sometimes it's 0000 but when I drop a coin through, it'll go all the way down the chute (and not the coin return) but it won't register a credit.

Is coin assignments registered to the mobo or the game? (I'm assuming mobo)