Canon imageCLASS LBP121dn User Manual page 276

Cannot Print (Wireless LAN)
Cannot Print (Wired LAN)
Cannot Print (USB Connection)
Cannot Print (via Print Server)
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Printing Is Slow
Management Functions and Environment Settings
Cannot Access Remote UI
Changing the Time Until Sleep Mode
Lost Department ID or PIN for the Administrator
Checking the Items That Can Be Configured on the Machine and Their Settings
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A Message Appears
An Error Code Is Displayed
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If the Problem Persists
Troubleshooting
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