# Turning On the Wrench

1. On the back of the MTRwrench 85 HMI, pull back the locking lever on the battery housing's door and open the door.

2. Insert the battery into its housing.

   Make sure that the lace edge is visible to make removal easier.

3. Close the battery housing door.

   Make sure that the edge of the lace remains inside.

Once the MTRwrench 85 is on, the Progress LEDs on the HMI start blinking with white light show that a MTRwrench 85 requires a zerozero adjustment is required.

The Radio Communication LED on the HMI starts blinking to notify the MTRwrench 85 wireless communication is ON.

Relevant Information

- Performing a Zero Adjustment