Check The Rf Part - Panasonic KX-TG8421EB Service Manual

KX-TG8421E/KX-TG8422E/KX-TG8423E/KX-TG8424E/KX-TGA840E
9.1.4.

Check the RF part

9.1.4.1. Finding out the Defective part
After All the Checkings or Repairing
1. Re-register the checked Handset to the checked Base Unit, and Regular HS to Regular BU.
Note:
If you need to register a handset, refer to Registering a Handset to a Base Unit (P.22)
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