Safe Mode engine features Engine behavior Control panel behavior
Ignore standard bin full sensor Standard bin full messages are not
reported.
Standard bin full messages will not
occur.
Print at narrow media operating point Pages are printed slower. N/A
Ignore all input options Reports that only Tray 1 is installed. Only Tray 1 and the MPF are selectable.
Ignore all output options Does not any report installed finishing
options.
No finishing options are selectable.
Ignore rear door sensor Rear door open messages are not
reported.
Rear door open messages do not occur.
Reduce print speed Pages are printed slower. N/A
Reduce time to first print Slower time to first print. N/A
Fixing print quality issues
• “Initial print quality check” on page 55
• “Gray background on prints” on page 56
• “Printer is printing blank pages” on page 57
• “Printer is printing solid black pages” on page 58
• “Repeating defects” on page 58
• “Shadow images appear on prints” on page 59
• “Skewed print” on page 59
• “Streaked horizontal lines appear on prints” on page 61
• “Streaked vertical lines appear on prints” on page 62
• “Toner rubs off” on page 63
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:
• The printer must be in a location that follows the recommended operating environment specifications. See
“Environment” on page 882.
• 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.
4063
Diagnostic information
55
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