Multi-Tech Systems MTA128NT - Manual (Page 36)

Troubleshooting
MTA128ST/NT 36
None of the LEDs light when the MTA128ST/NT is on
When you turn on the MTA128ST/NT, the LED indicators on the front panel should flash briefly as the TA
runs a self-test. If the LEDs remain off, the TA probably is not receiving power.
• Make sure the MTA128ST/NT’s power switch is on, especially if you normally turn on the TA by turning
on a power strip.
• If the power supply is plugged into a power strip, make sure the power strip is plugged in and its power
switch is on.
• Make sure the power supply module is firmly connected to the MTA128ST/NT and to the wall outlet or
power strip.
• If the power strip is on and the MTA128ST/NT is switched on, try moving the TA’s power supply to
another outlet on the power strip.
• Test that the outlet is live by plugging a lamp into it.
• The MTA128ST/NT or power supply may be defective. If you have another Multi-Tech MTA128ST/NT, try
swapping MTA128ST/NTs. If the problem goes away, the first MTA128ST/NT or power supply may be
defective. Call Tech Support for assistance.
Caution: Do not under any circumstances replace the power supply module with one designed for
another product, as it may damage the MTA128ST/NT and void your warranty.
The MTA128ST/NT does not respond to commands
• Make sure the MTA128ST/NT is plugged in and turned on. (See None of the LEDs Light When the
MTA128ST/NT Is On.)
• Try resetting your MTA128ST/NT by turning it off and on.
• Make sure you are issuing the MTA128ST/NT commands from the data communications software, either
automatically, or manually in terminal mode. (You cannot send commands to the MTA128ST/NT from the
DOS prompt.)
• Make sure you are in terminal mode in your data communications program. Then type AT and press
ENTER. If you get an
OK response, your connections are good and the problem likely is in your
phonebook entry or session settings.
• If you don’t get an OK, the problem may still be in the communications software. Make sure you have
done whatever is necessary in your software to make a port connection. Not all communications pro-
grams connect automatically to the COM port. Some connect when the software loads and remain
connected until the program ends. Others, like MultiExpress Terminal, can disconnect without ending the
program (make sure the Connect icon looks plugged in). MultiExpress Terminal also allows multiple
terminals to be open, but only one can access the MTA128ST/NT at a time. If MultiExpress Terminal
reports that it cannot make a connection, yet the MTA128ST/NT’s
TR indicator is on, click on the Window
menu to see if more than one terminal is open. The MTA128ST/NT’s TR indicator shows that the
software has made a connection with the TA through the COM port.open, but only one can access the
MTA128ST/NT at a time. If MultiExpress Terminal reports that it cannot make a connection, yet the
MTA128ST/NT’s
TR indicator is on, click on the Window menu to see if more than one terminal is open.
The MTA128ST/NT’s TR indicator shows that the software has made a connection with the TA through
the COM port.
• Your communications software settings may not match the physical port the MTA128ST/NT is connected
to. The serial cable may be plugged into the wrong connector—check your computer documentation to
make sure. Or you may have selected a COM port in your software other than the one the MTA128ST/
NT is physically connected to—compare the settings in your software to the physical connection.
• If the MTA128ST/NT is on, the cable is plugged into the correct port, the communications software is
configured correctly, and you still don’t get an
OK, the fault may be in the serial cable. Make sure it is
firmly connected at both ends.