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 37
• “Gray background or toner fog on prints” on page 38
• “Repeating defects” on page 39
• “Printer is printing blank pages” on page 39
• “Printer is printing solid black pages” on page 40
• “Shadow images appear on prints” on page 40
• “Skewed print” on page 41
• “Streaked horizontal or vertical lines appear on prints” on page 43
• “Toner rubs off” on page 44
• “Toner specks appear on prints” on page 45
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 developer (toner) cartridge.
Initial print quality check
Before troubleshooting specific print problems, complete the following initial print quality check:
1 The printer must be in a location that follows the recommended operating environment specifications. See
“Operating environment” on page 380.
2 Check the life status of all supplies. Any supply that is low should be replaced.
3 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.
4 Print a Menu settings page. Be sure to keep the original Menu settings page to restore the customer's custom
settings if needed.
5 Verify on the Menu settings page if the following are set to their default values:
• Print resolution: 600 dpi
• Toner darkness: 8
6 Inspect the transfer roll for damage. Replace if damaged.
7 Inspect the toner cartridge and imaging unit for damage. Replace if damaged.
8 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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