Canon iPF685 Series Basic Manual page 128

Mail box full. Delete unwanted data
Cause
100 jobs are stored in the Personal Box.
128
Delete print jobs from the queue.
(See "Managing the Job Queue (Deleting or Preempting Other Jobs).")
Delete unneeded jobs stored in personal boxes.
(See "Deleting Saved Jobs.")
Corrective Action
User's Guide
➔
iPF685 Series
User's Guide
➔
Basic Guide