Panasonic KX-TGP500B04 Service Manual page 71

10.1.6. Check the RF part
10.1.6.1. 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:
(*1) HS: Handset
(*2) BU: Base Unit
10.1.6.1.1. Deregistering All Handsets by the Base Unit
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KX-TGP500B04/KX-TPA50B04