HP LaserJet Pro M521 Multifunction Printer series - Manual (Page 216)

3. In the For product box, enter the product model number, and then click the Go button.
4. Click the link for your operating system.
5. Scroll to the Firmware section of the table.
◦ If the listed version matches the version on the configuration page, you have the
most current version.
◦ If the versions are different, download the firmware upgrade file and upgrade the
firmware on the product following the on-screen instructions.
NOTE: The product must be connected to a computer with internet access to
upgrade firmware.
◦ Resend the fax.
4. Verify that the fax was set up when the product software was installed.
From the computer, in the HP program folder, run the Fax Setup Utility.
5. Verify that the telephone service supports analog fax.
● If using ISDN or digital PBX, contact your service provider for information about configuring
to an analog fax line.
● If using a VoIP service, change the Fax Speed setting to Slow(V.29) from the control panel.
Ask if your service provider supports fax and for the recommended fax modem speed. Some
companies might require an adapter.
● If you are using a DSL service, make sure that a filter is included on the phone-line connection
to the product. Contact the DSL service provider, or purchase a DSL filter if you do not have
one. If a DSL filter is installed, try another filter because filters can be defective.
6. If the error persists, find more detailed problem-solving solutions in the sections that follow this one.
Perform a fax diagnostic test
From the product control panel, you can run a diagnostic test that provides information about the
product fax settings.
1. From the Home screen on the product control panel, touch the Setup button.
2. Open the following menus:
● Service
● Fax Service
3. Touch the Run Fax Test button to start the test. The product prints a test page that shows test results.
202 Chapter 9 Solve problems ENWW