Panasonic UF-580 Service Manual page 91

4.3.1. Information Codes: 400, 420
400
START
Enable the monitor
speaker. (Refer to Sect.
5.1 Parameter No. 008)
Perform a transmission
test to the remote unit in
question.
Does the remote unit
send the CED and 300
bps Fax signal ?
Yes
Does the remote unit
repeat the 300 bps
signal every 3 sec.?
Yes
Is transmission to the
reference unit successful?
Yes
1. Refer to Sect. 4.6.
2. Check the remote unit.
(Remote unit is defective)
END
Is reception from a
reference unit
successful?
1. Misdialed call.
2. Check the remote unit.
(Remote unit is defective)
3. Refer to Sect. 4.6.
No
1. Check the remote unit.
No
(Remote unit is defective)
2. Check the telephone
number to the remote unit.
No
1. Replace the MJR PCB.
2. Replace the SC PCB.
Does the trouble still occur?
Yes
420
START
No
Yes
END
No
END
91
Check the line
connection from the wall
jack to the "Line" on the
MJR PCB.
Replace the SC PCB.