Panasonic KX-TG4753B - Check the RF part; Finding out the Defective part

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KX-TG4753B/KX-TG470B/KX-TGA405B
10.1.8. Check the RF part
10.1.8.1. Finding out the Defective part
Prepare Regular HS (*1) and Regular BU (*2) and Regular RE (*3). Handset is Power ON with “1“, “6“and “#“.
Note:
(*1) HS: Handset
(*2) BU: Base Unit
(*3) RE: Range Extender
START
(other checkings)
Registration of Handset and Range Extender to
Base Unit (checked ones)
Registration of Regular HS and Regular RE to
Regular BU
Use Regular HS
HS is defective
OK
NG
Use Regular BU
BU is defective
OK
NG
Use Regular RE
RE is defective
OK