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I'm in the middle of assembling the Serial Interface and Batt. Charger board but have run into a snag. While testing the serial circuit, I was able to see the +-9V values on pin 2 of U16. However, when testing the transmit and receive functions of (...) (23 years ago, 25-Aug-01, to lugnet.robotics.handyboard)
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| | Re: Serial LED is not lighting up during charger board assembly
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Hi Scott, as I mentioned before i only assembled some 6.270 boards, but no handyboard. So what's follwing is only what i guess. I can't check this out here. Are you able to measure (always with pin7 J9 as ground reference) +9V at pin2 U16 and -9V at (...) (23 years ago, 26-Aug-01, to lugnet.robotics.handyboard)
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| | Re: Serial LED is not lighting up = pilot error
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I believe I've determined the problem. It looks like pilot error. Upon closer inspection of the serial LED, I noticed that it was defintely backwards in comparison to the power LED. I know that the power LED works like it should so the serial LED (...) (23 years ago, 3-Sep-01, to lugnet.robotics.handyboard)
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| | Re: Serial LED is not lighting up = pilot error
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Hi Scott, the handyboard part-list says that this LEDs are from the HLMP17xx series. These LEDs are low-current LEDs and only need 2 mA current at (1.8V) 1.9V forward voltage. So your 10mA 3V LEDs doesn't fit. Have a look at : (URL) you can use LEDs (...) (23 years ago, 3-Sep-01, to lugnet.robotics.handyboard)
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