Here is a link to a problem like the one you are having Shapeoko XL Initialization problems - #2 by avetrano
This is the text that I posted
Sounds like you may have an issue with the wiring for the limit sensors or the connectors for the sensors.
I would power up the machine but don’t initialize it and check the sensors to see if the red light on the sensor come on. Use your collet wrench and place it on the sensor. the light should illuminate red on the sensor and the indicator light on the control board should also light up.
Red on the sensor = it sensed the object
Blue on the control board (or another color) = the PC board received the signal
If either or both of the lights don’t light up first check all connectors and pins. Place a metal object on the sensor and wiggle each connector one at a time and see if the lights work. Open up each connector and look for pins that have been pushed out or damaged.
Usually it is a connector issue if you do find a bad connector or if you still have a problem contact support@
Hope this helps.
Anthony
There are two indicator lights that need to light up
One is the RED led on the proximity switch…When Lighted this indicates the sensor has sensed an object in its sensing area.
The second light that is in the circuit board that the proximity sensor is connected to. This light should be BLUE (thats the color on my board). When this light is Light it indicates the wiring from the sensor has sent a signal to the control board. If this Light Is not lit when there is an object in the sensors path and the red light on the sensor is on there is in issue with the wiring and or a connector has an open circuit.
To test this follow the steps above and wiggle test the connectors and look at the control board to see if the blue Led lights up or flickers. If it does either of these two there is an issue at or near the connector you were wiggling.
Inspect the terminals on the connector for damaged pins or burnt pins.
Sorry I had pictures of the lights but have no idea where they have been placed.
Anthony