Panasonic DX-2000 Service Manual page 140

4.3.6. Information Code: 434
START
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.
END
No
Yes
Replace the FCB PCB.
No
Can the transmitter in question
Yes
transmit to the other units?
Change the parameter in Service Mode 1.
(Refer to Sect. 5.2.)
No
for transmitter : #010 : Increase Tx Level
for receiver : #011 : Reduce Rx Sensitivity Level
140
Yes
Check the remote unit in question.
(Remote unit is defective)