Canon LBP7780CX User Manual page 921

Allow print jobs with unknown IDs from the Remote UI.
Solution
"Specifying an ID for Each Department "
Change to Black, or change paper type settings. <Auto Error Skip>
<Cause> You have attempted to print color transparencies.
Perform the following procedure.
Solution
"Canceling the Process Currently Being Performed (Soft Reset)"
Change waste t. ctn.
<Cause> The waste toner container is full.
Replace the waste toner container with a new one.
Solution
"Consumables"
Check ITB unit. Remove packing material (sheet).
<Cause> There is packing material (sheet) remaining in the output area.
Turn OFF the printer, remove the packing material (sheet) from inside the right cover, and then turn the
Solution
printer back ON.
Check paper size.
<Cause 1> The size of the paper loaded in a paper source is different from the following settings.
Setting for [Output Size] in the [Page Setup] tab in the printer driver
[MP Tray Paper Size], [Drawer 1 Size] or [Drawer 2 Size] in the [Select Feeder] menu
Specify the setting properly.
Solution "Registering the Paper Size and Type"
"Configuring the Printer Driver and Printing"
<Cause 2> When the following settings in the [Select Feeder] menu are set to [Mixed Sizes], custom
size paper whose long edges are 215.9 mm or less is loaded in portrait orientation and printed (only
when the UFR II printer driver is used).
[MP Tray Paper Size]
[Drawer 1 Size]
[Drawer 2 Size]
Solution Load the paper in landscape orientation, and then print again.
<Cause 3> When the UFR II printer driver was not used, custom size paper was loaded in landscape
orientation to be printed.
Solution Load the paper in portrait orientation, and then print again.
1. Perform a soft reset.
"Canceling the Process Currently Being Performed (Soft Reset)"
2. Either prints them in black and white or uses paper other than transparencies.