Panasonic UF-490 Service Manual page 72

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
Replace the SC 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.
72
No
END
No