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Unread 02-18-2008, 09:41 AM
adam2177 adam2177 is offline
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RC +5V Pin Voltage

Has anyone actually measured the +5V pins on their RC under normal operating conditions? I was curious and measured ours and both our 2007 and 2008 RC output 6.9V on these pins under no load. I thought the RC had an onboard 5V regulator which should mean these pins are at 5V, not 6.9. If the output from these pins is not actually regulated, then this would make more sense.
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Unread 02-18-2008, 09:44 AM
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Re: RC +5V Pin Voltage

The positive voltage on the PWM outputs is connected to the backup battery not to the internal 5 volts supply. The voltage pin on digital and analog inputs is connected to the internal 5 volt supply.
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Unread 02-18-2008, 09:45 AM
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Re: RC +5V Pin Voltage

Al is correct. Are you sure you measured the pins claiming to be 5V and not the ones claiming 7.2V?
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Unread 02-18-2008, 09:54 AM
adam2177 adam2177 is offline
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Re: RC +5V Pin Voltage

No, I measured the +5V pins in the analog and digital banks. I am aware that the PWM pins are connected to the backup battery.
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Unread 02-18-2008, 10:08 AM
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Re: RC +5V Pin Voltage

the gnd to Positive (black and red lines) should be 5v +- .25v. Ours is usually within that range.

As a side note, on our bot the gnd and 5V was shorted without harming the RC, but of course things did not work.
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Unread 02-18-2008, 10:11 AM
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Re: RC +5V Pin Voltage

Thanks for the info. I'm concerned we either have a bad regulator our the gear tooth sensor lines are shorting and sending 12V into the 5V lines.
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Unread 02-18-2008, 12:07 PM
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Re: RC +5V Pin Voltage

Quote:
Originally Posted by adam2177 View Post
Thanks for the info. I'm concerned we either have a bad regulator our the gear tooth sensor lines are shorting and sending 12V into the 5V lines.
AHHHH! Remove the GTS and check the voltage again. I am betting a wiring error on the GTS swapping the 12 volt and 5 volt supply lines. Breaker should have been tripping.
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All is better now, NOS parts are working fine. Why does this year's game remind me of Violet in Willie Wonka? Hmmmm, I see blueberries!
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