Panasonic UF-890 Service Manual page 122

4.3.3 Information Codes: 404, 405, 407
Is communication with reference
unit successful?
Change Function Parameter #010:
Reduce Tx Attenuation Level
No
Does the problem still occur?
Change Function Parameter #017:
Reduce Tx Modem Speed
No
Does the problem still occur?
Change Function Parameter #025:
Communication Startup to 2nd
Does the problem still occur?
START
No
Yes
Yes
Yes
Yes
No
END
1. Replace the LCU PCB.
2. Replace the FCB PCB.
Does the problem still occur?
Yes
Check the telephone line condition.
Check the remote unit.
(Recording paper may have run
out or paper may have jammed.)
Does the problem still occur?
Yes
Refer to Sect. 4.6.
122
No
END
No