• “Toner smear check” on page 57
• “Toner specks check” on page 58
Initial print quality check
Before troubleshooting print problems, perform the following:
• Clean the photoconductor unit and printhead. For more information, see “Cleaning the charger and the printhead
lens” on page 537.
• Make sure that the printer is located in an area that follows the recommended operating environment and power
requirement specifications.
• Check the status of supplies. Replace supplies that are low or empty.
• Load 20‑lb plain letter or A4 paper. Make sure that the paper guides are properly set and locked. From the control
panel, set the paper size and type to match the paper loaded in the tray.
• Print and keep the menu settings page. The original menu settings page will be used to restore the customer’s
custom settings if necessary.
• Make sure that the Print resolution and Toner darkness on the menu settings page are set to their default values.
• Check the transfer roller, toner cartridge, and transfer belt for damage, and replace if necessary.
• Print the print quality pages to see if the problem remains. Use tray 1 to test print quality problems. Look for
variations in the print from what is expected.
• Make sure that the correct print driver is used to prevent print problems. If the wrong print driver is installed,
incorrect characters could print, and the copy may not fit the page correctly.
Gray background check
ABCDE
ABCDE
ABCDE
Leading edge
Trailing edge
Actions Yes No
Step 1
a Navigate to Settings > Allow Background Removal.
Make sure that the value is set to On.
b Navigate to Settings > Print Settings > Quality Menu.
Decrease the toner darkness (8 is the default value).
Does the problem remain?
Go to step 2. The problem is solved.
7421
Diagnostic information
46
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