Weird Jamma wiring harness question

kcchief59

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I am building a 48 in 1 for a raffle at our local high school. I have the everything working but a couple of areas. The 8 slot on the parts and solder side of the Jamma Harness is for coin doors. I have 2 coin slots so I am using both of these along with the 2 in the 16 slot. This set up works. However, when I go to the 10 slot for speakers it was connected with others going to a old style monitor. I am using an old curved glass pc monitor, so I cut the 2 wires for the speaker that were in slot 10 and there is no sound. However, when I disconnect the 2 wires coming from the 8 slot and hook them to the speakers I have sound, and no wires to put for the coin doors? Does this make sense to anybody?


The other issue which I have a seperate thread on that was started yesterday is regarding this one joystick game with 3 buttons on each side of the stick. I am trying to get both buttons to work for each player, so they can choose to fire, etc, with their left or their right. I have a seperate thread on this also, if you can help.

Thanks!
 
so. pin 8 should be for the coin counters, if you're using them. pin 16 is for the coin switches. but as far as getting sound on pin 8, that doesn't make sense. what kind of jamma harness are you using? is it possible pin 10 is jumped to pin 8?

and when you say you 'cut' the wires on pin 10 and there is no sound, what do you mean by that? was there sound before?
 
No there wasn't sound before, slot 10 wires were combined with the wires from 12 and 13 and were combined in a plug that would go to the monitor. I cut the 2 from the 10 slot-speakers away and there was no sound. The two wires from 8 work the coin door and work the speakers. I could just splice, but that doesn't make any sense.
 
Thanks Ken. My 48 in 1 came with a pinout as well. It is the same, except I do not have a 9 or an 11, they are empty. The 8 works the coin door, and it also works the speakers, the 10 was combined on a connector with 12 and 13, I assume going to the monitor. I removed the 10's and connected them to the speaker with no results. I could use the 8's for both the speakers and coin doors via a splice, but it just doesn't make any sense why and how it is doing this...

Thanks!!!
 
There isn't. This is a brand new 48 and 1 board straight out of the package. I have another I will plug into tonight to see if it is a board issue. It seems like they have to joined for them to work in both spots... If so, I should be able to splice these wires and run up to the speaker and to the coin door. As long as it works... it should be good.
 
Are you sure this is a JAMMA harness? There are other 56-pin (28-row) connectors that are NOT JAMMA. If you're getting sound on Pin 8, then it sounds like it's not JAMMA...
 
It's definitely a jamma... I believe it's the boards I bought. The 8 and 10 slots must be traced together somewhere. I just spliced the 8 and ran to the speakers and to the coin doors and they both work fine. Go figure.
 
What game was originally in this cabinet ?
Like Mod said, there are other games that use the same 56 pin "JAMMA" connector but are wired totally different.

Does this cocktail have a Nintendo Sanyo or Sharp monitor in it by chance ?
(just trying to figure out why audio would be wired towards the monitor)

I just breezed through this post and immediately got confused, so lets start back to basic JAMMA wiring pinouts.

The 8 slot on the parts and solder side of the Jamma Harness is for coin doors.

The 8 and J slots are for coin COUNTERS, not the coin door switches.
They operate differently from anything else.
Most people won't even bother to wire those up, so I would just leave those slots out of the equation for now.

I have 2 coin slots so I am using both of these along with the 2 in the 16 slot.

You should be using slot 16 for one switch and slot T for the second coin switch. (plus a common ground for each) The ground can be daisy chained from one switch to the other and shared with the coin door lights if you wish.

when I go to the 10 slot for speakers it was connected with others going to a old style monitor.

JAMMA only outputs mono sound directly from the harness. So your speaker should be connected to slot L (negative side) and slot 10 (positive side).

The other issue which I have a seperate thread on that was started yesterday is regarding this one joystick game with 3 buttons on each side of the stick. I am trying to get both buttons to work for each player, so they can choose to fire, etc, with their left or their right.

If I'm understanding you correctly, what you are wanting to set up are ambidextrous controls. (same layout on both sides of the stick)
Just wire up your first set of buttons as you normally would and then daisy from those buttons over to the second set of buttons.

If you suspect any problems with the 48in1 board, wire it up like it is supposed to be according to JAMMA specifications and then try ANY JAMMA board in there to see if you have sound and such working.

EDIT: well, KLOV resized my image to a useless size, so here is the direct link.
http://wiki.arcadecontrols.com/wiki/Image:Jamma-pinout.gif
 

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