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YAESU FTM-400DR 
Turning on the Digital Squelch
"Code and Break function"

​Using the "Touch screen and Dial knob".
1. Press and hold "DISP" ​(1 sec) ​until the Menu appears 
2. Press "TX/RX"
3. Press "DIGITAL"
4. Press "​2 ​SQL TYPE"
5. Press "​2 ​ SQL TYPE" till you see "BREAK"
6. Press "​3 SQL CODE"
7. Press "3 ​SQL CODE" rotate ​dial ​knob to choose "073"
8. Press "BACK", "BACK", "BACK", "BACK"

Note: In the Function menu change the Sql setting to "D-TRX"