When to Replace the Toner Cartridge
When a Message Appears on the Screen of the Operation Panel or Remote UI
Follow the message on the screen to prepare a new toner cartridge and replace the old one. Print quality
may suffer if you continue using the toner cartridge without replacing it.
For details about the message and how to resolve it, see the following:
When Print Quality Deteriorates
If printouts show any of the symptoms below, the toner cartridge is near the end of their lifetime. It is
recommended to replace the toner cartridge even if a message does not appear.
Streaks appear
Printing is uneven
Toner smudges and splatters appear
White spots appear
Partially faded
The entire background is darkened
Before Replacing Toner Cartridge
Perform the following procedure before replacing the toner cartridge. The message on the screen may disappear, and
the print quality may improve.
1
Close the paper stopper, and then open the toner cover.
Maintenance
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Summary of Contents for imageCLASS LBP121dn
Page 1: ...imageCLASS LBP122dw LBP121dn User s Guide USRMA 7917 00 2023 02 en Copyright CANON INC 2023 ...
Page 7: ...Notice 358 Trademarks and Copyrights 359 Third party Software 361 VI ...
Page 47: ... Shared Key Encryption for WPA WPA2 TKIP AES CCMP IEEE 802 1X Authentication Setting Up 40 ...
Page 65: ... The settings are applied Setting Up 58 ...
Page 100: ...Paper with logo in landscape orientation Basic Operations 93 ...
Page 105: ... The custom paper is registered Basic Operations 98 ...
Page 138: ...6 Log out from Remote UI Linking with Mobile Devices 131 ...
Page 159: ...8 Log out from Remote UI Security 152 ...
Page 207: ... Off On Settings Menu Items 200 ...
Page 250: ... Off On Settings Menu Items 243 ...
Page 284: ... When you select On the printing speed may decrease Troubleshooting 277 ...
Page 353: ...Manual Display Settings 95LW 08H Appendix 346 ...