How to Change the Baud Rate on an HP LaserJet Fax

HP LaserJet all-in-one printers with fax capabilities have a high-speed V.34 fax modem designed to operate over traditional analog phone service. You can force your LaserJet's fax modem to use a slower speed if you know your telephone connection will not support the higher speed connection. This is necessary at many small businesses that use a digital or Internet telephone system with an analog bridge such as a voice-over-IP (VoIP) system from a company like Cisco, Avaya or Alcatel.

LaserJet Professional M1130/M1210

Press the "Setup" button, marked with a wrench, on the printer's control panel.

Press the arrows on the control panel's directional pad to select the "Fax Setup" option, then press the "OK" button to activate it.

Press the arrows on the control panel's directional pad to select the "All faxes" menu option, then select it by pressing the "OK" button.

Press the arrows on the control panel's directional pad to select the "Fax speed" menu option, then press the "OK" button.

Use the arrows to select your desired fax speed, then press the "OK" button to select it.

LaserJet Professional M425

Press the "Home" button on the printer's touch screen.

Touch the "Setup" button, denoted by an image of a wrench and a nut, on the control panel screen.

Touch the option labeled "Fax Setup."

Touch the option labeled "Advanced Setup."

Scroll the screen down and touch the button labeled "Fax Speed."

Touch the speed setting you want your LaserJet's fax modem to use.