Fax troubleshooting checklist Laserjet printer HP МФП HP LaserJet Pro 400 M425

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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)

 or disable 

Fast(V.34)

 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 using a DSL service, ensure 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 since these filters can be defective.

6.

If the error persists, find more detailed problem-solving solutions in the sections that follow this one.

ENWW

Solve fax problems 101