Panasonic KX-TG2480BXS Service Manual page 31

8.1.3. Test Link Mode
Note:
(*1) When you check test mode, connect to the external Buttons because Base Unit has only LOCATOR key. Refer to "For Test
Mode" in Base Unit Reference Drawing (P.38). -Insert AC adaptor during checking.
(*2) for factory use only
(*3) Refer to Check Table for RF part (P.26) and Test Link Mode (P.35) for proper Handset Settings.
(*4) If you enter the test mode correctly, GHARGE LED flashes once. Line1 is selected and you are in "Select Antenna mode".
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KX-TG2480BXS / KX-TGA248BXS