Communications - Panasonic UF-490 Service Manual

4.6.

Communications

This section explains general troubleshooting procedures for the 400 series of Information Codes. These
errors are primarily caused by poor telephone line quality (loss, noise, echo, etc.). This unit is furnished with
Service Mode 1 to assist in troubleshooting line quality problems.
It is suggested that both the transmitting unit and receiving unit be adjusted. This section gives relevant
parameters in Service Mode 1 for the transmitting and receiving sides. If no improvement is realized after
the parameters are adjusted, it is recommended that the parameters be returned to the default settings.
4.6.1. Communication Trouble
START
Is this an international
communication?
To equalize loss (Amplitude Distortion) between
the fax unit and the phone company exchange
Transmitting Side
#014 : 0 dBm
Transmitting Side
#010 : -9 dBm
#032 : 33600 bps 31200 to 2400 bps
To cope with impulse noise
Receiving Side
#070 : 128
To cope with shifted signal sequences caused by an echo
Transmitting Side
#025 : 1st 2nd
Perform a communication test after changing settings.
Yes
No
#021 : Off
#025 : 1st
Receiving Side
#013 : 0 dBm
4, 8, 12 dBm
To improve a poor S/N (signal-to-noise ratio)
0 to -15 dBm
256 to 2048
Receiving Side
#024 : 2100 Hz
#030 : 75 ms
Transmitting Side
On
2nd
4, 8 or 12 dBm
Receiving Side
#011 : -43 dBm -33 dBm or -38 dBm
#033 : 33600 bps 31200 to 2400 bps
#023 : Normal Long
1080 Hz
1 sec
107
Receiving Side
#033 : 33600 bps 31200-2400/
TC9600/TC7200
#024 : 2100 Hz
1080 Hz
#030 : 75 ms 1 sec