Safe Mode engine features Engine behavior Control panel behavior
Ignore all input options Will report that only Tray 1 is installed. Only Tray 1 and the MPF will be
selectable.
Ignore all output options Will not report any installed finishing
options.
Finishing options will not be selectable.
Use large interpage gaps Pages will have large interpage gaps. N/A
Fixing print quality issues
• “Initial print quality check” on page 39
• “Gray background or toner fog check” on page 40
• “Repeating defects check” on page 41
• “Blank pages check” on page 41
• “Solid black pages check” on page 42
• “Shadow images check” on page 42
• “Skewed print check” on page 43
• “Streaked horizontal or vertical lines check” on page 45
• “Toner smear check” on page 46
• “Toner specks check” on page 47
The symptoms described in this chapter might require replacement of one or more CRUs (Customer Replaceable Units)
designated as supplies or maintenance items, which are the responsibility of the customer. With the customer's
permission, you might need to install a toner cartridge.
Initial print quality check
Before troubleshooting specific print problems, complete the following initial print quality check:
• The printer must be in a location that follows the recommended operating environment specifications. See
“Operating environment” on page 450.
• Check the life status of all supplies. Any supply that is low should be replaced.
• Load 20‑lb plain letter or A4 paper. Make sure 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 a menu settings page. Be sure to keep the original menu settings page to restore the customer’s custom
settings if needed.
• Verify on the menu settings page if the following are set to their default values:
– Print resolution: 600 dpi
– Toner darkness: 8
• Check the transfer roll for damage. Replace if damaged.
• Check the toner cartridge and imaging unit for damage. Replace if damaged.
• Print the print quality pages to see if the problem remains. Use Tray 1 to test print quality problems.
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Diagnostic information
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