Panasonic UF-490 Service Manual page 74

4.3.5. Information Codes: 408, 409, 417, 418, 490
START
Is communication with
the reference unit
successful?
Yes
Is the unit transmitting or
receiving?
Receiving
Change Function
Parameter #071: Increase
Error Tolerance
Does the problem still
No
occur?
Yes
Change Function
Parameter #011: Reduce
Rx Sensitivity Level
Does the problem still
No
occur?
Yes
Change Function
Parameter #018:Reduce
Rx Modem Speed
No Does the problem still
occur?
Yes
Change Function
Parameter #013: Increase
G3 Rx Equalization
No
Does the problem still
occur?
END
No
Transmitting
Change Function
Parameter #010: Reduce
Tx Attenuation Level
Does the problem still
occur?
Yes
Change Function
Parameter #017: Reduce
Tx Modem Speed
Does the problem still
occur?
Yes
The telephone line may have
Yes
a high level of white noise
and/or frequent impulse noise.
Ask the telephone company
to check the line.
74
1. Replace the SC PCB.
Does the problem still occur?
Yes
Check the telephone line
condition.
No
No
No
END