Ivan Stewart Off Road

More reviving of an old thread...

I have one I'm working on, and when I put my DMM on AC mode and test the 5v line, it's showing 10volts? This is with a brand new power supply that is giving me the prescribed 5.2volts on the board.

What I would like to know is if I'm reading the AC wrong? Do I just check it with the DMM in 200v AC mode, and red to red, black to black on the board? I never really understand AC power testing. If I'm reading it right and I really am getting 10v AC on the 5vdc line then that would be a problem.

Are you sure it is 10 volts and not a decimal (or some other way your meter is representing what 10 is?) Are you getting any symptoms? Game not working? Etc?
 
Are you sure it is 10 volts and not a decimal (or some other way your meter is representing what 10 is?) Are you getting any symptoms? Game not working? Etc?
It was registering as 10.10 or around there, but I'm pretty sure it was 10.something. I am getting multicolored garbage on the screen and the game isn't booting. The manual says this is a symptom of AC voltage getting onto the 5vdc line. I can't figure out why that voltage would be there being that it's a new power supply, and the 5volts are right on 5.20 volts. I must be reading it wrong or something, I'm not sure.
 
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Are you sure it is 10 volts and not a decimal (or some other way your meter is representing what 10 is?) Are you getting any symptoms? Game not working? Etc?
I used a different DMM to measure AC voltage and got a reading of 00.1 but I think that's still too high right? I'm not sure I trust either of my DMM's though, might be time to invest in a new one.
 
I used a different DMM to measure AC voltage and got a reading of 00.1 but I think that's still too high right? I'm not sure I trust either of my DMM's though, might be time to invest in a new one.

Different meters measure things (and display the results) differently. It might be helpful to post a screenshot of the reading so we could see if the 00.1 represents something else (i.e. do we have to move zeros to interpret the measurement). The manual that you are looking at says it should not be more than .005 volts AC or you may get garbage on the screen.

My gut tells me AC on the line (if it is 00.1 volts) is not likely your problem. These boards are known to have issues so my money would be on something else especially given you have a brand new switching power supply in there with the same results. Still makes sense to be sure about how much AC is on the line though just to rule it out and move on.
 
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