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HP LaserJet Pro MFP M428, M429, M479, M521, M570 - Improve fax quality

Use the steps in this document to improve fax quality.

Note:

The steps vary according to the type of control panel.

Touchscreen with white background

Touchscreen with black background

Click the section below for your control-panel type and then follow the steps provided.

Touchscreen control panel with white background

Follow these steps if your printer has a touchscreen control panel with a white background.

Touchscreen with white background

Check the scanner glass for dirt and smudges

Over time, specks of debris might collect on the scanner glass and white plastic backing, which can affect performance. Use the following procedure to clean the scanner.

In addition to the steps below, you can view the following video of how to clean the scanner glass.

Press the Power button to turn off the printer, and then disconnect the power cable from the electrical outlet.
Open the scanner lid.
Clean the scanner glass, the document feeder strips, and the white plastic backing (underneath the scanner lid) with a soft cloth or sponge that has been moistened with nonabrasive glass cleaner.

CAUTION:
Do not use abrasives, acetone, benzene, ammonia, ethyl alcohol, or carbon tetrachloride on any part of the printer; these can damage the printer. Do not place liquids directly on the glass or platen. They might seep and damage the printer.
Dry the glass and white plastic parts with a chamois or a cellulose sponge to prevent spotting.
Connect the power cable to an outlet, and then press the Power button to turn on the printer.

Check the send-fax resolution setting

Follow these steps to adjust the resolution of outgoing faxes.

Note:

Increasing the resolution increases the fax size and send time.

From the Home screen on the printer control panel, swipe right and touch the Fax icon.
Touch Send Now, and then touch the Settings icon .
Touch Resolution, and then touch the desired setting.

Note:
Try the Standard resolution setting if the fax will not send with a higher resolution.

Check the error correction setting

Usually, the printer monitors the signals on the telephone line while it is sending or receiving a fax. If the printer detects an error during the transmission and the error-correction setting is On, the printer can request that the portion of the fax be resent.

Note:

The factory-set default for error correction is On.

You should turn off error correction only if you are having trouble sending or receiving a fax, and you are willing to accept the errors in the transmission.

Turning off the setting might be useful when you are trying to send a fax overseas or receive one from overseas, or if you are using a satellite telephone connection.

From the Home screen on the printer control panel, swipe right and touch the Fax icon.
Swipe right and touch the Setup icon.
Touch Preferences.
Scroll to Error Correction Mode, and then touch the button to turn the setting off or on.

Send to a different fax machine

Send the fax job to a different fax machine.

If the fax quality is better, the problem is related to the initial recipient's fax machine settings or supplies status.

Check the sender's fax machine

Ask the sender to try sending from a different fax machine. If the fax quality is better, the problem is with the sender's fax machine.

If a different fax machine is unavailable, ask the sender to consider making the following changes:

Make sure the original document is on white (not colored) paper.
Increase the fax resolution, quality level, or contrast settings.
If possible, send the fax from a computer software program.

Touchscreen control panel with black background

Follow these steps if your printer has a touchscreen control panel with a black background.

Touchscreen with black background

Check the scanner glass for dirt and smudges

Over time, specks of debris might collect on the scanner glass and white plastic backing, which can affect performance. Use the following procedure to clean the scanner.

In addition to the steps below, you can view the following video of how to clean the scanner glass.

Press the Power button to turn off the printer, and then disconnect the power cable from the electrical outlet.
Open the scanner lid.
Clean the scanner glass, the document feeder strips, and the white plastic backing (underneath the scanner lid) with a soft cloth or sponge that has been moistened with nonabrasive glass cleaner.

CAUTION:
Do not use abrasives, acetone, benzene, ammonia, ethyl alcohol, or carbon tetrachloride on any part of the printer; these can damage the printer. Do not place liquids directly on the glass or platen. They might seep and damage the printer.
Dry the glass and white plastic parts with a chamois or a cellulose sponge to prevent spotting.
Connect the power cable to an outlet, and then press the Power button to turn on the printer.

Check the send-fax resolution setting

Follow these steps to adjust the resolution of outgoing faxes.

Note:

Increasing the resolution increases the fax size and send time.

From the Home screen on the printer control panel, touch the Setup button .
Touch the Fax Setup menu.
Touch the Advanced Setup menu.
Touch the Fax Resolution menu, and then touch the desired setting.

Note:
Try the Standard resolution setting if the fax will not send with a higher resolution.

Check the error correction setting

Note:

The factory-set default for error correction is On.

You should turn off error correction only if you are having trouble sending or receiving a fax, and you are willing to accept the errors in the transmission.

Turning off the setting might be useful when you are trying to send a fax overseas or receive one from overseas, or if you are using a satellite telephone connection.

From the Home screen on the printer control panel, touch the Setup button .
Touch the Service menu.
Touch the Fax Service menu.
Touch the Error Correction button, and then touch the On or Off button.

Send to a different fax machine

Send the fax job to a different fax machine.

If the fax quality is better, the problem is related to the initial recipient's fax machine settings or supplies status.

Clean the pickup rollers and separation pad in the document feeder

If the document feeder experiences paper-handling problems, such as jams or multiple-page feeds, clean the document-feeder rollers and separation pad.

Open the document-feeder cover.

Open the document-feeder cover
Use a moist, lint-free cloth to wipe both pickup rollers and the separation pad to remove dirt.

CAUTION:
Do not use abrasives, acetone, benzene, ammonia, ethyl alcohol, or carbon tetrachloride on any part of the printer; these can damage the printer. Do not place liquids directly on the glass or platen. They might seep and damage the printer.

Location of the pickup rollers and separation pad in the document feeder
Close the document-feeder cover.

Close the document-feeder cover