KX-TG5511CAB, KX-TG5511CAJ, KX-TGA550RUB, KX-TGA550RUJ, KX-TGA551RUB, KX-TGA551RUJ (serv.man2) - Panasonic Telephone Service Manual (repair manual). Page 31

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KX-TG5511CA/KX-TGA550RU/KX-TGA551RU
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 in the Operating Instructions.
1. Prepare Regular HS (Handset) and Regular BU (Base unit).
2. a. Re-register regular HS (Normal mode) to Base Unit (to be checked).
        If this operation fails in some ways, the Base Unit is defective.
    b. Re-register Handset (to be checked) to regular BU (Normal mode). 
        If this operation fails in some ways, the Handset is defective.
Base Unit is defective
Handset is defective
START
Registration of 
Regular HS to
Base Unit
Registration of 
Handset to
Regular BU
(other checkings)
Registration of Handset to Base Unit 
(checked ones)
Registration of Regular HS to Regular BU
Yes
No
No
Yes
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