Panasonic UF-E1 Service Manual page 67

4.3.1. Information Codes: 400, 420
400
START
Enable the monitoring circuit.
(Refer to Sect. 5.3 Parameter
No. 08)
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 defective)
END
Is reception from a reference
unit successful?
1. Misdialed call.
2. Check the remote unit.
(Remote unit defective)
3. Refer to Sect. 4.6.
No
1. Check the remote unit.
No (Remote unit defective)
2. Check the telephone
number to the remote unit.
No
1. Replace the SC PCB.
2. Replace the NCU PCB.
Does the trouble still occur?
Yes
420
START
No
Yes
END
No
END
63
Check the line connection
from the wall jack to the "Line"
on the NCU PCB.
Replace the SC PCB.
UF-E1