Panasonic KX-TCD420BXM

Symptom Remedy*
The movement of Battery Low indicator is wrong.
Make confirmation in
item
(
A
)
~(
C
(F)~(G)
The handset does not respond to a call from base unit.
Make adjustments in item
(
A
)
~(
C
(H), (J)~(N)
The handset does not transmit or the transmit frequency is off.
Make adjustments in item
(
A
)
~(
C
(H)~(K), (M)
The transmit frequency is off.
Make confirmation in
item
(
A
)
~(
C
(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
(
I
)
,
(
L
)
The reception sensitivity of base unit is low with noise.
Make confirmation in
item
(
L)
Does not link between base unit and handset.
Make confirmation in
item
(
A
)
~(
C
(H)~(N)
The reception level is high or low.
Make adjustments in item
(
O
)
The transmit level is high or low.
Make adjustments in item
(
P
)
* : Refer to Adjustment ()
15.1. Adjustment
Please follow the items below when BBIC or EEPROM are replaced.
Items
Adjustment
Point
Procedure
Check
Replace
Parts
(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,
C17
47
www.freeservicemanuals.info
1/2/2015
Digitized in Heiloo, Holland