Panasonic KX-TCD430GC Service Manual page 45

The movement of Battery Low indicator is wrong.
The handset does not respond to a call from base unit.
The handset does not transmit or the transmit frequency is off.
The transmit frequency is off.
The transmit power output is low, and the operating distance between
base unit and handset is less than normal.
The reception sensitivity of base unit is low with noise.
Does not link between base unit and handset.
The reception level is high or low.
The transmit level is high or low.
* : Refer to Adjustment (Handset)
15.1. Adjustment (Handset)
Please follow the items below when BBIC or EEPROM are replaced.
Items
(A) 4.0V Supply
Confirmation
Symptom
()
Adjustment
Point
1. Confirm that the consumption current is < 200mA , that is, there is no short circuit.
-
2. Confirm that the voltage between TP14 and GND is 4.1V ± 0.2V.
Procedure*
45
Remedy
Make confirmation in item
(F)~(G)
Make adjustments in item
(H), (J)~(N)
Make adjustments in item
(H)~(K), (M)
Make confirmation in item
(H)~(K), (M)
Make confirmation in item
Make confirmation in item
Make confirmation in item
(H)~(N)
Make adjustments in item
Make adjustments in item
Check
IC1,F1,R21
R4,C33,L2
D1,C15,C2
C14,Q1,R3
R2,D2,R22
C26,X1,C16