Cause Corrective ActionThe printer has detected that the Top Cover isopen. If the error occurs again, close the Top Cover, turn off the printer, and wait a whilebefore restoring power.Prepare for parts replacement.Prepare for parts replacement.Cause Corrective ActionIt is almost time to replace consumablesfor which service is required.You can continue to use the printer for some time until "Parts replacement time haspassed." will be displayed.Contact your Canon dealer for assistance.Parts replacement time has passed.Parts replacement time has passed.Cause Corrective ActionIt is past the recommended time to replace consumables for which service is required. Contact your Canon dealer for assistance.Unknown file.Unknown file.Cause Corrective ActionData sent to keep the printer up to date (such as pa-per information) is in the wrong format.Check the data. Turn off the printer and wait a while before restoring power,and then resend the data.You have uploaded firmware for a different model. Check the firmware version. Turn off the printer and wait a while before re-storing power, and then resend the firmware.If the message is displayed again, contact your Canon dealer for assis-tance.Multi-sensor errorMulti-sensor errorCause Corrective ActionDirect sunlight or strong lighting may be shining onthe printer and causing the sensor to malfunction.Take steps to ensure the printer is not used when exposed to direct sunlightor strong lighting.The performance of a sensor inside the printer maybe impaired.Turn off the printer and wait at least three seconds before restoring the pow-er.If the message is displayed again, contact your Canon dealer for assistance.iPF840 Series Prepare for parts replacement.Basic GuideError Message Other Messages145
