Jamma Harness help

smitymike11

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I have a jamma dynamite duke and I think the harness is having problems. With the dynamite duke plugged in I have noticed very little problems. I just picked up a WWf Wrestlefest board and I am having the same problems and even worse. Sometimes the WWf game will not show the characters, if I wiggle the plug in everything works just fine. I figure the jamma harness might be a cheep one. So where do you get a good one and what is the difference? Also if I buy a standard jamma harness does it come wired for a 4 player game? If not what one is made for a 4 player game?
 
Bob roberts harness is very highly regarded. iirc no harness is wired for 4p, most 3/4p games use a kick/sub harness anyways.
 
The jamma harness is made specifically for 1 or 2 players.
The additional 3 player and 4 players are wired using a seperate harness that if you wish can be zip tied to the jamma harness.
I believe someone else can chime in on where exactly to pick these 3/4 player harnesses from.
I would check on your jamma harness too to make sure the wiring coming from the power supply are nice and tight.
Sounds like a possible loose wire going to the power supply.
 
4P games have pin connectors that plug into the boards that are separate from the Jamma harness. These connect to the joysticks and buttons for 3P and 4P respectively...and I should know I spent alot of time messing with those!
 
check the voltages at the harness? could be its low/high thats causing the issue with graphics, I have had that on a few boards on my test rig, where if the voltages are low/high it will be goofy, could also be a JAMMA harness pin issue, but before buying a new one, check your voltages
 
4P games have pin connectors that plug into the boards that are separate from the Jamma harness. These connect to the joysticks and buttons for 3P and 4P respectively...and I should know I spent alot of time messing with those!


Is that what the white things with the pins sticking out of them are for?
 
Probably just a bad connection at the board. Make sure you clean the edge connector on the WWF board, and I might even go as far as removing the pins from the connector and bending them out a bit. On my UMK3 the sound would cut in and out randomly. I cleaned the connector and bent the pins on the speaker wires out a little bit to make a better connection and the problem went away. Best part was I got the guy down from $275 to $140 since the sound wasn't working!!!
 
Games that use more inputs than what are supplied in the Jamma harness are known as "Jamma+" games.
 
Most if not all JAMMA harnesses on ebay are very cheaply made with poor quality connectors, thin wire, and poor quality soldering.

Bob Roberts harnesses aren't bad, but you can't beat buying a quality japanese JAMMA connector (eg Hirose or Sanwa) and making the harness up yourself.
 
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