Originally Posted by
haastec
Check in the diagnostics page to see if the pallet clamp switch is showing clamped or not and see if it toggles using M17/M18. If it is not showing clamped, run M17 (unclamp) and make certain that the locating pins are lined up. Sometimes the pallet will bounce back towards the pallet changer and not be in the correct position. Also, check to make sure chips are not in the locating hole for the pin. If you blow chips while changing pallets, this can happen.
While you have the pallet unclamped, check to see if you can toggle the clamp/unclamp switch manually. I believe it is at the front right side of receiver. If it does not toggle manually, check the wiring for the switch as it may have gotten damaged.
Hope this helps.