Panasonic KX-A143EXC, Service Manual

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Symptom Remedy
The movement of Battery Low indicator is wrong.
Make confirmation in item
(F)~(G)
The handset does not respond to a call from base unit.
Make adjustments in item
(H), (J)~(N)
The handset does not transmit or the transmit frequency is off.
Make adjustments in item
(H)~(K), (M)
The transmit frequency is off.
Make confirmation in item
(H)~(K), (M)
The transmit power output is low, and the operating distance between
base unit and handset is less than normal.
Make confirmation in item
The reception sensitivity of base unit is low with noise.
Make confirmation in item
Does not link between base unit and handset.
Make confirmation in item
(H)~(N)
The reception level is high or low.
Make adjustments in item
The transmit level is high or low.
Make adjustments in item
* : Refer to Adjustment (Handset) ()
15.1. Adjustment (Handset)
Please follow the items below when BBIC or EEPROM are replaced.
Items
Adjustment
Point
Procedure* Check
(A) 4.0V Supply
Confirmation
-
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.
IC1,F1,R21,
R4,C33,L2,
D1,C15,C2,
C14,Q1,R3,
R2,D2,R22,
C26,X1,C16,
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