Panasonic KX-TG6641B Service Manual page 39

10.1.6. Check the RF part
10.1.6.1. Finding out the Defective part
1. Prepare Regular HS(*1) and Regular BU(*2).
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.
After All the Checkings or Repairing
1. Re-register the checked handset to the checked base unit, and Regular HS to Regular BU.
Base unit is defective
Note:
(*1) HS: Handset
(*2) BU: Base Unit
No
Registration of
Regular HS to
base unit
Yes
(other checkings)
Registration of Regular HS to Regular BU
Registration of handset to base unit
KX-TG6641B/KX-TG6643B/KX-TG6644B/KX-TG6645B/KX-TGA660B
START
Registration of
handset to
Regular BU
Yes
(checked ones)
39
No
Handset is defective