Canon LBP7780CX User Manual page 916

E1 Prep. waste toner ctn.
<Cause> The waste toner container needs to be replaced soon.
Although you can continue to print for a while, have ready a new waste toner container.
Solution
"Consumables"
EM E-Mail access error.
<Cause> The printer could not connect to the POP3 server because an error had occurred in its hard
disk.
Solution Clear the hard disk error on the POP3 server.
EM POP3 server error.
<Cause> The printer could not connect to the POP3/SMTP server when printing e-mails, or the settings
for the POP3/SMTP server are not correct.
Check the error in detail using the Remote UI or Network Status Print.
Solution
"Receiving E-mail Data on the Mail Server and Printing (E-mail Print)"
FD Check firmware.
<Cause> There is an old version of the file inside the firmware.
Update the firmware.
Solution
"[Setup] Menu ([User Maintenance] Options)"
IE An unknown error has occurred.
<Cause> An unknown IEEE802.1X authentication error has occurred.
Restart the printer. If the error message still appears after restarting this printer, contact your local
Solution
authorized dealer.
IE Cannot analyze the certificate.
<Cause> During IEEE802.1X authentication, analysis of the certificate received from the authentication
server failed.
Solution Check the authentication server's certificate.
IE Change the password.
<Cause> The password used for IEEE802.1X authentication has expired.
Change the password registered in the authentication server, and reset the IEEE802.1X authentication
Solution password.
"Setting IEEE802.1X Authentication"
IE Check auth. settings