How to turn off find my device using the iCloud so the iPad can be repaired

Remotely erase a device

To prevent anyone else from accessing the data on your missing device, you can erase it remotely. When you erase your device, all of your information (including credit, debit, or prepaid cards for Apple Pay) is deleted from the device, and you won't be able to find it using Find My:

1. Open the Find My app and tab the Devices tab.
2. Select the device you want to remotely erase.
3. Scroll down and choose Erase This Device.
4. Select Erase This [device].

After you erase a device, you can't track it. If you remove the device from your account after you erase it, Activation Lock will be turned off. This allows another person to turn on and use your device.

One cannot turn off an iPad via iCloud. Are you asking about signing out of the iPad?