Jamma question

lopan2008

New member
Joined
Sep 21, 2008
Messages
166
Reaction score
0
Location
Strasburg, Virginia
I'm puzzled on this one: Picked up a Real Ghostbusters board from a friend. Tested it before bringing it home and it worked 100%. Wrapped it in bubble wrap and brought it home. Plugged it into my Jamma cabinet and I get nothing. Grabbed my DJ Boy board, same thing. Tried my Main Event board and got sound but no video.
I recently added a CGA/VGA converter board so that I could use a flat screen computer monitor (I have both vertical and horizontal games in the same cabinet) and I have a Red Box installed in my cabinet as well. In order to get the six button layout for the Red Box I had to wire the sixth button in place of one of the ground wires on the Jamma Harness (as per instructions in the manual).
I have check all wiring connections, and connected and re-connected the Jamma harness to the board several times. I plugged the Red Box back in and everything loads right up as it should. Could changing the wiring to add a button have caused this symptom for a normal Jamma board?
 
Sounds like you have one of two issues:

a) a power problem. Some JAMMA boards require -5v to work properly, and some don't. if you plug one that needs -5 into a harness that doesn't have it hooked up, it won't work.

b) A video problem. I've had issued with some of the VGA adapters not always wanting to convert certain boards, even though they are supposedly the same resolution type as others that work fine.

If you are sure your board works just fine, then check into these two possibilities...
 
Dug out an unmodified Jamma extender harness. I can get boards to work with that plugged in. The Main Event still plays blind (could be that compatability issue mentioned above?) and DJ Boy resets constantly after displaying the ROM check ok message and showing the very begining of the start up screen (it was occasionally glitching last time I played it.)
 
Back
Top Bottom