If you want, I can:

The red button usually serves as the power on/off switch. Press and hold to turn on; press briefly to access quick functions or illumination.

Use the Internet Archive to pull old Leica Geosystems support pages from the early 2000s. Some pages contained HTML-based versions of the quick start guides.

Leica Tcr805 Total Station User Manual ⟶ «GENUINE»

If you want, I can:

The red button usually serves as the power on/off switch. Press and hold to turn on; press briefly to access quick functions or illumination.

Use the Internet Archive to pull old Leica Geosystems support pages from the early 2000s. Some pages contained HTML-based versions of the quick start guides.