Canon imageCLASS D1650 All-in-One Monochrome Laser Printer - Manual (Page 625)

A Message or a Number Starting with "#" (an Error
Code) Is Displayed
3JX3-0AF
When a message appears on the machine's display, or a number (error code) prefixed with "#" appears, see the
following sections to check the solution.
Countermeasures for Each Message(P. 618)
Countermeasures for Each Error Code(P. 632)
Troubleshooting
617