Bruce,
Check the voltages with your -ve probe on the mother board. In case there is a ground fault in P1 or wire!
Raj
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At 11-03-18, you wrote:
I think my microBitx main board may be defective. When powered up (without the raduino attached), according to the wiring instructions, it only draws 60-80 micro amps, rather than 90-110 mA the instructions specify. I have checked twice that the sacrificial diode is installed correctly.
Any ideas how to proceed?
Thanks,
Bruce W1BWA