Panasonic KX-TG5621BXS Service Manual page 31

8.1.2. RX-CW TEST Mode
Note:
(*1) When you check test mode, connect to the external Buttons because Base Unit has only LOCATOR key. To short KIN3
to GND, refer to a method of connection of TEST_SW in "For Test Mode" in Base Unit Reference Drawing (P.39). -Insert AC
adaptor during checking.
(*2) Refer to Check Table for RF part (P.25) and Test Burst Mode (P.34) for proper Handset settings.
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KX-TG5621BXS / KX-TGA561BXS