Canon C9075 PRO Operating Manual page 200

Empty the trim waste tray.
Cause The trim waste tray of the Inner Booklet Trimmer-A1 is full.
Remedy Remove the trim waste in the trim waste tray of the Inner Booklet Trimmer-A1. (See "Removing Trim Waste, " on p. 1-46.)
The hard disk needs to be replaced. (Call service rep.)
Cause The hard disk is not functioning properly, or is not attached.
Remedy1 Contact your local authorized Canon dealer.
Remedy2 If the optional Removable Hard Disk Kit is installed, check the hard disk.
2
2-112
List of Error Messages