Panasonic KX-TCD540NZM Service Manual page 90

The base unit does not respond to a call from cordless handset.
The base unit 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 cordless handset is less than normal.
The reception sensitivity of base unit is low with noise.
The transmit level is high or low.
The reception level is high or low.
The unit does not link.
* : Refer to Adjustment (Base Unit)
)
14.1. Adjustment (Base Unit)
Please follow the items below when BBIC or EEPROM or FLASH ROM are replaced.
Items Adjustment
(A) 4.0V Supply
Confirmation
(B) 4.0V Supply
Confirmation
Symptom
Point
1. Confirm that the voltage between TP14 and GND is 4.0V ± 0.2V.
TP14
1. Confirm that the voltage between TP3 and GND is 4.0V ± 0.2V.
TP3
(
Procedure
90
Remedy*
Make adjustments in item (A)~(H),
(J)~(P).
Make adjustments in item (A)~(G)
(J)~(P).
Make adjustments in item (A)~(G)
(J)~(P).
Make confirmation in item (J), (M)
Make confirmation in item (M).
Make confirmation in item (Q)~(S)
Make confirmation in item (Q)~(S)
Make adjustments in item (A)~(P).
Check or
Replace
Parts
CN2, L8, L9,
D1, C1, C2,
C211, C309,
IC1, C114,
C3,
C306
CN2, L8,
L9,
D1, C1, C2,
C211, C309,
IC15, C273,
C212, C308,
C310