Panasonic UF-E1 Service Manual page 72

UF-E1
4.3.6. Information Code: 434
Is communication with the
reference unit successful?
Does the trouble occur
regardless of the remote unit?
The telephone line may have a high
level of white noise and/or
frequent impulse noise.
Ask the telephone company to
check the line.
START
No
Yes
No
Yes
END
Replace the SC PCB.
Can the transmitter in question
transmit to the other units?
No
Change the parameter in Test Mode 1.
(Refer to Sect. 5.3.)
for transmitter : #20 : Increase Tx Attenuation Level
for receiver : #21 : Reduce Rx Sensitivity Level
68
Check the remote unit in question.
Yes
(Remote unit defective)