Check The Rf Part - Panasonic KX-TG2873BXS Service Manual

10.1.8. Check the RF part

10.1.8.1. Finding out the Defective part
After All the Checkings or Repairing
1. Re-register the checked CL-HS to the checked BU, and Standard CL-HS to Standard BU.
Note:
(*1) CL-HS: Cordless Handset
(*2) BU: Base Unit
10.1.8.1.1. Re-registering the Cordless Handset
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KX-TG2873BXS/KX-TGA280BXS