Compaq Armada M300 series Maintenance And Service Manual page 43

Table 2-15
Continued
Problem
Modem does not dial correctly.
Characters are garbled/transfer
rates are slow.
Phone line noise causing a
disconnection.
No dial tone
2-20 Troubleshooting
Possible Cause
Telephone number is not entered
correctly in the modem's dialing
software.
There is noise in the telephone
line.
Hang-up Delay S Register (S10)
set too low.
Phone service is not connected to
the telephone wall jack.
The modem is not responding to
commands from the computer
keyboard.
Solution
Make sure the telephone number
you dialed is correct if you are using
the dialing directory or the terminal
mode.
Dial 1 if using dialing long distance.
The other line could be busy or not
answering.
Make sure call waiting is disabled.
The modem may not recognize an
international dial tone. Try the
ATX3DT command and the
telephone number.
Check your telephone and modem
cable connections. If they are a
little loose, they can cause noise
on the line.
Check with your local telephone
company for a phone line filter.
Change S10 default to 150.
To set S10=150:
1. Select Start Å Programs Å
Accessories Å HyperTerminal,
then go to Command Mode.
2. Type ATS10=150 and press
Enter.
This command causes the modem to
take longer to disconnect even if there
is no noise on the line.
Verify that service from the local
phone company by following these
steps:
1. Unplug the telephone cable from the
telephone wall jack.
2. Connect a telephone to the jack,
pick up the handset, and listen for a
dial tone. If there is a dial tone,
reconnect the modem to the
telephone wall jack with the
telephone cable and make sure all
connections are secure.
3. If there is still no dial tone, contact
your local phone company or
building manager.
Verify the modem and computer are
connected:
1. Select Start Å Programs Å
Accessories Å HyperTerminal, then
go to Terminal Mode.
2. Type AT and press the Enter key. If
the modem displays OK, the modem
and computer are working together.
If the modem displays ERROR, or
does not respond, restart the
computer and repeat step 1.
3. Type ATDT and listen for dial tone.
4. Type ATH0 to hang up.
Continued