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of the phone line by plugging a phone into the telephone wall jack and listening for static or
other noise. If the problem persists, turn Error Correction Mode (ECM) off and contact your
telephone company.
If you are still having problems faxing, set the Fax Speed to a slower rate such as Medium
(14400) or Slow (9600).
Cause Other equipment that uses the same phone line as the HP All-in-One might be in use.
Solution Make sure extension phones (phones on the same phone line, but not connected
to the HP All-in-One) or other equipment are not in use or off the hook. For example, you cannot
use the HP All-in-One for faxing if an extension phone is off the hook, or if you are using a
computer dial-up modem to send e-mail or access the Internet.
Cause The HP All-in-One shares the same phone line with a DSL service and a DSL filter is
not connected.
Solution If you use a DSL service, make sure that you have a DSL filter connected or you
will not be able to fax successfully. The DSL service sends out a digital signal on the phone
line that can interfere with the HP All-in-One, preventing the HP All-in-One from sending and
receiving faxes. The DSL filter removes the digital signal and allows the HP All-in-One to
communicate properly with the phone line. To check if you already have a filter installed, listen
to your phone line or dial tone. If you hear noise or static on the line, you probably do not have
a DSL filter installed, or it is installed incorrectly. Obtain a DSL filter from your DSL provider. If
you already have a DSL filter, make sure it is connected correctly.
Cause Another process has caused an error in the HP All-in-One.
Solution Check the display or your computer for an error message providing information
about the problem and how to solve it. If there is an error, the HP All-in-One will not send or
receive a fax until the error condition is resolved.
You can also check the status of the HP All-in-One by clicking Status in the HP Solution Center.
Cause You are using either a PBX or an ISDN converter/terminal adapter.
Solution
● Make sure the HP All-in-One is connected to the port that is designated for fax and phone
use. Also, make sure that the terminal adapter is set to the correct switch type for your
country/region, if possible.
Note Some ISDN systems allow you to configure the ports for specific phone
equipment. For example, you might have assigned one port for telephone and
Group 3 fax and another port for multiple purposes. If you have problems when
connected to the fax/phone port of your ISDN converter, try using the port
designated for multiple purposes; it might be labeled "multi-combi" or something
similar.
For more information on how to set up the HP All-in-One with a PBX phone system or
ISDN line, see Case C: Set up the HP All-in-One with a PBX phone system or an ISDN
line.
● Try setting the Fax Speed to Medium (14400) or Slow (9600).
Cause The Fax Speed setting is set too fast.
Solution You might need to send and receive faxes at a slower rate. Try setting the Fax
Speed to Medium (14400) or Slow (9600) if you use one of the following:
● An Internet phone service
● A PBX system
Chapter 5
84 HP Photosmart C7100 All-in-One series
Troubleshooting and support