Jamma harness question

kpkube

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Noob with a question. Sorry if this has been asked before. I have a jamma harness and I'm
trying to figure it out. There seems to be a discrepancy in the harness. The icade chart for the harness is numbered on both sides and no color codes. I have a copy of jammaboards pinout which has the color codes. on my connector Pin 15 test switch is red and pin R is orange. According to jammaboards pin 15 should be orange and pin R should be red. Is it common to find some of these wires to be switched. Also pin 8 and J are missing wires for the coin counter. Should there be a key at pin 7/H, if so where can I find one to put in so the board does not get installed backwards. I have a couple of scans of the harness just to make sure I have it correct.
 

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The pinout is standard, the colors not as much. Rely on connecting the proper pin number/letter to the proper place, not the colors.

Did you intend to hook up a coin counter? These were primarily for acutual money-earning applications, for bookkeeping and cash box verification type things. For home use, lack of a coin counter isn't really a big deal to most people.

Yes, there should be a key in 7/H. http://www.therealbobroberts.net/key.jpg You'll pay more than one is worth in shipping to buy one. Perhaps some generous soul will just mail you one...

Next time, get a Bob Roberts Fully Loaded, or other good-quality JAMMA harness rather than a chepo-Chinese-sweat-shop import, and it'll come fully populated, with a key, decent length wires, etc.
 
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i wouldn't worry terribly about wire color. different harness makers use different colors. as far as the missing wires, that is a cheaper harness. you can probably get the key from bob roberts.
 
All that matters is the pinouts. The only wire colors that seem to follow any standards are the +5 volts being red and the ground being black.
 
All that matters is the pinouts. The only wire colors that seem to follow any standards are the +5 volts being red and the ground being black.

And even then... I've seen redemption games where ground is WHITE and +12, not +5, is red... that particular game didn't have a +5 period.

Moral of the story: don't rely on wire colors unless the game's manual specifically tells you certain colors are certain things.
 
And even then... I've seen redemption games where ground is WHITE and +12, not +5, is red... that particular game didn't have a +5 period.

Wonder Wheel ? (Baytek)



Everyone has pretty much said it all......IGNORE THE COLOR OF THE WIRE.
They could be all the same color, wire is wire.
FROM where TO where is all that matters.
 
Thanks for the replys.
Did I lay out the connector in the images the right way. The first image I labeled parts side (the numbered tape) and the second solder side(alphabet). I took out the pins where the key should be.
 
Bay-Tek does the "red = +12" thing, but they at least use black for ground...

Not always. ;)
Seen white for +12v and Green or Black for Ground. (even the manual is confused)

Anyways, the point for the OP was to go by a schematic or pinout and trace the wires, never trust a color code.
 
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