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Some obscure jamma questions

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Ummon:

The first thing has to do with using an audio amp. In my cabinet, it looks like the +12 volt leads from the edge connector go to the audio amp. Does this mean powering it is dependent upon the board connected? What's happening here?

The next question is simpler and repair-oriented. I was doing something ridiculous and disconnected the wires from the harness. In soldering them back on, I bent and broke one of the connections off the wire side of the harness. How would you suggest fixing this?

CheffoJeffo:


--- Quote from: Ummon on October 29, 2008, 11:15:51 pm ---The first thing has to do with using an audio amp. In my cabinet, it looks like the +12 volt leads from the edge connector go to the audio amp. Does this mean powering it is dependent upon the board connected? What's happening here?
--- End quote ---

Are you talking about an off-board audio amp that you want to run w/o a game board ? (It's early and I may be missing the point of your question).


--- Quote from: Ummon on October 29, 2008, 11:15:51 pm ---The next question is simpler and repair-oriented. I was doing something ridiculous and disconnected the wires from the harness. In soldering them back on, I bent and broke one of the connections off the wire side of the harness. How would you suggest fixing this?
--- End quote ---

Remove the pin and put in a new one. You may need a pin extractor to remove the pin cleanly. I think Bob Roberts and Mikes Arcade sell them.

* CheffoJeffo slaps his head and remembers that he needed one this weekend to rewire a harness and forgot to put it on his order list

Ummon:


--- Quote from: CheffoJeffo on October 30, 2008, 07:18:19 am ---
--- Quote from: Ummon on October 29, 2008, 11:15:51 pm ---The first thing has to do with using an audio amp. In my cabinet, it looks like the +12 volt leads from the edge connector go to the audio amp. Does this mean powering it is dependent upon the board connected? What's happening here?
--- End quote ---

Are you talking about an off-board audio amp that you want to run w/o a game board ? (It's early and I may be missing the point of your question).
--- End quote ---

I'm just trying to figure out what is required for the amp to operate.



--- Quote ---
Remove the pin and put in a new one. You may need a pin extractor to remove the pin cleanly. I think Bob Roberts and Mikes Arcade sell them.

--- End quote ---

Ah, thanks. I couldn't tell by looking at the board side that the pins were separate.

Ummon:

Bumping this. It looks as if the audio amp requires something kind of input from the board connected to the JAMMA interface, as the +12 goes from somewhere in the harness (I'm assuming it's coming from the PS), to the edge connector and then to the amp. Is this the case?

Bleagh:

It sounds like someone took one of the 12 v wires and ran it from the jamma harness to the amp instead of the power supply.  Since all the 12v wires are connected at the jamma harness when a game is inserted, the amp will then be powered.  You would be best off if you ran the 12v to the amp directly from the power supply.  Honestly, you don't even need the amp unless you have some weird setup.  You don't want to power your cabinet without a board installed, if the power supply has no load it can burn up.

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