The New York Times's When Voyager 2 Calls Home, Earth Soon Won’t Be Able to Answer explains that because Voyager 2's trajectory has taken it way below the ecliptic, of the three 70 meter dishes in the DSN only Canberra's can talk to it. So when it undergoes renovation soon, there'll be no more talking.
However, the article points out that reception of Voyager's transmissions will still possible.
Question: Why exactly is this so? Is it only the 70 meter dish's transmitter that's being fixed? Why can't a pair of 34 meter dishes do the task but at a lower data rate? What is the technical explanation for receive-only?
While the team won’t be able to command Voyager 2, they will still be listening to the spacecraft. By combining the power of the other antennas in Canberra, they will be able to collect its scientific observations.
“The Canberra site will still be getting data back from the spacecraft,” Ms. Dodd said. “The science data will still be coming down.”
Being able to only listen could prompt some anxiety. While Voyager 2 will keep collecting and sending back science data, should something go wrong, members of the team will be powerless to help it, and will just have to watch with their hands tied.
“We’ve been planning on this for over a year,” Ms. Dodd said. “I think like any good planning, we’re prepared for it. And we’ve done our best, you know, we’ve done the best that we can.”
note aspherical cows in foreground:
Antennas belonging to the Deep Space Network complex in Canberra, Australia. Credit: Canberra Deep Space Communication Complex, By Shannon Stirone
below: data for the Sun, planets, Pluto, Voyager 1 and Voyager 2, from January 1, 1969 (a good year to start things) until now. Dots are now. Data is from NASA JPL Horizons. Reposted from this question, where additional details are given.