HP Officejet J5740 All-in-One Printer - Manual (Page 176)

check the sound quality 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 or Slow.
To change the ECM setting from the control panel
1. Press Setup.
2. Press 5, and then press 6.
This selects Advanced Fax Setup and then selects Error Correction Mode.
3. Press to select On or Off.
4. Press OK.
To set the fax speed from the control panel
1. Press Setup.
2. Press 5, and then press 7.
This selects Advanced Fax Setup and then selects Fax Speed.
3. Press to select one of the following settings, and then press OK.
Fax speed setting Fax speed
Fast v.34 (33600 baud)
Medium v.17 (14400 baud)
Slow v.29 (9600 baud)
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.
Chapter 12
174 Troubleshooting