The dial is probably locked. Look for a little padlock symbol on the display. Check the user manual for Dial or keyboard lock. Generally on Yaesu radios you use the function key plus a keyboard key. If the keyboard is labeled, you should see something that looks like a padlock next to the correct function key.
SOURCE: YAESU HAM RADIO FT270R DIAGRAM
http://www.radioamateur.eu/schemi/FT270_sch.pdf
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