Originally Posted by
netboss
Ken,
Not saying this is your problem, but some circuits are so sensitive that the current flow through the LED will give a 'false' non-touch condition. The reason reversing the leads caused Mach3 to work is that the LED then became a blocking diode.
Try bumping the resistor value up to 1k or even 1.5k. LED may be dim, but it may allow both LED and probe to work.
IMHO it is very unlikely that the LED is the problem. LEDs are pretty generic and most have the same electrical characteristics. Since is lit up on the 1st Econo-Probe, it's not blown.
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