JAMMA Tester - Is this anything?

I just posted these in the for sale section today for $29 each.
I'd give a $3 discount for multiples... meaning $26 each after the first.

send funds to [email protected] and make sure you include your address. or contact me for a paypal invoice.

Thanks everyone!
 
Interesting thought for consideration as I'm pursuing adding the voltage accuracy LEDs:
I can make a circuit that only lights up when the 5V buss is >5V
I can also do the same for the 12V and -5V buss...

However, most of the PSU's I use these days only have 1 knob. So, I dial in the 5V to be 5.05V
Then I check the 12V and -5V to make sure they are somewhere in the neighborhood. It seems like they are often less than 12V and less than -5V

With that in mind, what voltage level should I pick to signify "good" for these?

12V buss:
  • >11 Volts
  • >12 Volts
  • something else?

Also, if you guys don't mind, I'd prefer to have these kinds of discussions about what you dislike here, as opposed responding to my ForSale posts. Thanks!
 
You'll need some sort of load for that to have any sort of meaning. It doesn't do any good to adjust your power supply to 5.05V with no load, then plug in a CPS2 board and have it end up at 4.7V. Since the voltage will depend on the board plugged into it, I personally would stick with it just being a "this cab is mostly functional" board, then the user will need to adjust the power supply once the desired board is installed.

Along the lines of a load... a lot of switchers require a minimum load (typically on the +5V line), usually around 0.5A. Without them, they can be damaged (though not usually, but will sometimes go into shutdown). You may want to put something like a ceramic 10 ohm resistor from 5V to GND (or at least pads for it as an option).

DogP
 
As I've had a few switchers go bad (spiking the 12v) in JAMMA cabinets, I prefer to check the voltages from time to time. That's why I would like LEDs for each voltage. I've been playing with the idea of making a similar board, but going a step further by adding pots to adjust the voltages on the adapter board. Therefore, if the adapter board reads 5.0v and the 12v shows 13v, then I can adjust the pot on the adapter board down to 12v.

Scott C.
 
As I've had a few switchers go bad (spiking the 12v) in JAMMA cabinets, I prefer to check the voltages from time to time. That's why I would like LEDs for each voltage. I've been playing with the idea of making a similar board, but going a step further by adding pots to adjust the voltages on the adapter board. Therefore, if the adapter board reads 5.0v and the 12v shows 13v, then I can adjust the pot on the adapter board down to 12v.

Scott C.

Seems like the pots would have to be pretty stout to handle that much of a load.
 
Trying out a passthrough tester.
This one shows 5V level and button inputs while any Jamma gameboard is active
 

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Trying out a passthrough tester.
This one shows 5V level and button inputs while any Jamma gameboard is active
Is this capable of also displaying the 12v? Maybe using a heavy duty switch.

Scott C.
 
This one just has it connected to 5v buss. For the right price i can put a meter on all 56 pins.
 
Continuing the insanity of Jamma testers.
This one has buttons and Surface mounted LEDs.
I also plan to add the voltmeter for the 5V buss.
 

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Star Tech Journal JAMMA test card

Continuing the insanity of Jamma testers.
This one has buttons and Surface mounted LEDs.
I also plan to add the voltmeter for the 5V buss.

I like this version, especially if you put in the volt meter. I have one of the old Star Tech Journal JAMMA testers. These were made around 1990. For the power section the green LED meant voltage was good. Either of the red LEDs being lit meant the voltage was either too high or too low.
 

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