Quote Originally Posted by depronman View Post
I suspect with no resistor you have blown the new optical sensors
Take the pin 12 and touch it to ground. See if this triggers the pin in mach3
If it does then you have likely popped the new sensor

Paul


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Have tried that and the yellow light goes out so sounds like I am stuck until I get some resistors .
Will look out for my mail early in the week.

Had a look on RSwww and literally pence each but with £4.95 postage