Panasonic KX-TCD420GS Service Manual page 49

Items
Adjustment
(M RSSI Level
)* Confirmation
Point
- Follow steps 1 to 3 of (H) above.
4. Set DECT tester power to -88dBm.
5. Execute the command "readrssi".
6. Confirm: 29 < returned value < 3E (hex)
Procedure*
45
Check
Replac
Parts
IC6,IC4
C57,C61
C77,C78
C68,C69
R80,C63
R83,R84
L3,C79,C
C66,D10