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C-13980-A2-GB30-40 October 1998
Troubleshooting
Overview
Appendix B, Result Codes, points out basic problems
that can occur when operating a 3800Plus modem. Use
Tables C-1 through C-6 to check out these problems. If
you are having data communication difficulties, such as
periodic character loss, random errors, or constant format
errors, use the loopback tests described in Chapter 7, Test
Branch. With these tests you can usually isolate the fault
in your system by using the process of elimination. If
problems continue to occur, contact your service
representative.
Table C-1
Modem Integrity
Symptom
Action
Modem did not pass power-up self-test Contact your service representative.
Power LED does not light
LCD does not display
Make sure the modem’s ON/Off switch is in the ON position.
Make sure the ac power transformer is connected to the ac power receptacle.
If Power LED and/or LCD do not operate, contact your service representative.
A problem is suspected after the
power-up self-test
Perform a self-test via the modem’s DCP or type AT&T9 if using AT
commands.
Perform a local analog loopback with a Pattern test. If the modem consistently
registers errors, contact your service representative.
If the modem passes the above tests and a problem still exists, then the
problem is likely not with your modem.
C