Panasonic UF-890 - Page 124

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4.3.5 Information Codes: 408, 409, 417, 418, 490
START
END
Is communication with the
reference unit successful?
Is the unit transmitting or
receiving?
Yes
Transmitting
Receiving
No
Yes
No
Change Function Parameter #18:
Reduce Rx Modem Speed
Does the problem still occur?
1. Replace the LCU PCB.
2. Replace the FCB PCB.
Does the problem still occur?
Change Function Parameter #13:
Increase G3 Rx Equalization
Does the problem still occur?
END
Does the problem still occur?
Yes
Yes
No
Change Function Parameter #071:
Increase Error Tolerance
Change Function Parameter #011:
Reduce Rx Sensitivity Level
Does the problem still occur?
No
No
Yes
Yes
No
Does the problem still occur?
Change Function Parameter #010:
Reduce Tx Attenuation Level
Change Function Parameter #017:
Reduce Tx Modem Speed
level of white noise and/or frequent
The telephone line may have a high
impulse noise. Ask the telephone
company to check the line.
Does the problem still occur?
No
Yes
Yes
No
Check the telephone line condition.