mrjason
New member
I saw a couple threads here about using a multimeter to check voltages at the jamma edge connector.
I have my multimeter set to 20V DC mode.
My multimeter has a black lead plugged into a port called COM (common ground?), and red into one with all kinds of power symbols.
I put black with black, red with red, touching the inside of the jamma harness connector, and got a reading of 3.5v fairly steady (this without ever adjusting the pot on the back of the power supply).
Then I adjusted the pot on the back (a very minimal amount), this made the power supply's fan increase in speed but no sign of changing voltage, so i turned it back down to the "original fan speed".
I know nothing about electricity, so like an idiot i thought maybe my multimeter leads are backwards, so I plugged red with black and black with red on the jamma connector, the power supply instantly turned off. I didn't hear a pop, didnt hear anything funny, it just turned off.
Turning the machines power on/off does not bring the power supply fan back to life.
Is it dead? Did I just do something *really* bad, and if so, will just the power supply be fried, or is the jamma harness likely screwed up too or other parts like monitor etc..??
For reference this is an open ice 2 on 2 machine. Was trying to make sure my voltage was 5.2v for a test run of a new blitz board I received.
Also, is 3.6v a good reading at all? I've been running games on this thing (several PCBs) for months without issue, I can't see how 3.6v would be in the acceptable range to run something like my good blitz 99 board. (my multimeter is a $20 meter from fry's, by electro-tek). Testing a 9V battery before and after possibly killing the power supply reads 9.3v consistently..
I have my multimeter set to 20V DC mode.
My multimeter has a black lead plugged into a port called COM (common ground?), and red into one with all kinds of power symbols.
I put black with black, red with red, touching the inside of the jamma harness connector, and got a reading of 3.5v fairly steady (this without ever adjusting the pot on the back of the power supply).
Then I adjusted the pot on the back (a very minimal amount), this made the power supply's fan increase in speed but no sign of changing voltage, so i turned it back down to the "original fan speed".
I know nothing about electricity, so like an idiot i thought maybe my multimeter leads are backwards, so I plugged red with black and black with red on the jamma connector, the power supply instantly turned off. I didn't hear a pop, didnt hear anything funny, it just turned off.
Turning the machines power on/off does not bring the power supply fan back to life.
Is it dead? Did I just do something *really* bad, and if so, will just the power supply be fried, or is the jamma harness likely screwed up too or other parts like monitor etc..??
For reference this is an open ice 2 on 2 machine. Was trying to make sure my voltage was 5.2v for a test run of a new blitz board I received.
Also, is 3.6v a good reading at all? I've been running games on this thing (several PCBs) for months without issue, I can't see how 3.6v would be in the acceptable range to run something like my good blitz 99 board. (my multimeter is a $20 meter from fry's, by electro-tek). Testing a 9V battery before and after possibly killing the power supply reads 9.3v consistently..
