Communications - Panasonic DX-2000 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 troubleshoot-
ing 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?
No
To equalize loss (Amplitude Distortion) between the fax unit
and the phone company exchange
Transmitting Side
#014 : 0 dBm 4, 8, 12 dBm
To improve a poor S/N (signal-to-noise ratio)
Transmitting Side
#010 : -9 dBm 0 to -15 dBm
#032 : 33600 bps 31200 to 2400 bps
To cope with impulse noise
Receiving Side
#070 : 128 256 to 2048
To cope with shifted signal sequences caused by an echo
Transmitting Side
#025 : 1st 2nd
Perform a communication test after changing settings.
Yes
Transmitting Side
#021 : Off On
#025 : 1st 2nd
Receiving Side
#013 : 0 dBm 4, 8 or 12 dBm
Receiving Side
#011 : -43 dBm
#033 : 33600 bps
#023 : Normal Long
Receiving Side
#024 : 2100 Hz 1080 Hz
#030 : 75 ms 1 sec
#033 : 33600 bps
#024 : 2100 Hz
#030 : 75 ms
-33 dBm or -38 dBm
31200 to 2400 bps
166
Receiving Side
31200-2400/
TC9600/TC7200
1080 Hz
1 sec