69TroubleshootingPaper source selection isinappropriate. z You cannot load paper other than A4, Letter, or B5-sized plain paper in theFront Feeder. When using any other type of paper, load it in the Auto SheetFeeder.z Make sure that the proper paper source is selected. If not, change the papersource using the Paper Feed Switch or the printer driver. For details, see“Changing the Paper Source” on page 11.NoteWhen printing from your computer, if a setting other than Paper Feed Switch isselected for Paper Source in the printer driver, the printer driver settings takesprecedence when printing. For details on paper source selection using theprinter driver, refer to the Printer Driver Guide on-screen manual.Too much plain paper loaded. You can load approximately up to 150 sheets of 17 lb / 64 gsm plain paper in theAuto Sheet Feeder (0.52 inches / 13 mm in stack height) and up to 110 sheetsof 17 lb / 64 gsm plain paper in the Front Feeder (0.39 inches / 10 mm in stackheight). However, proper feeding of paper may not be possible at this maximumcapacity depending on the type of paper or environmental conditions (eithervery high or low temperature and humidity).In such cases, reduce the sheets of paper you load at a time to around half(around 0.2 inches / 5 mm in paper stack height).For details on loading paper, see “Loading Paper” on page 12.Foreign object in the Auto SheetFeeder or Front Feeder.Make sure that there are no foreign objects in the Auto Sheet Feeder or FrontFeeder.Envelopes not prepared or loadedproperly. z Refer to “Envelopes” in the User’s Guide on-screen manual, and prepare theenvelopes before printing.Once you have prepared the envelopes, load them in the Auto Sheet Feederin portrait orientation. If the envelopes are placed in landscape orientation,they will not feed properly.z If the Paper Support is extended, retract it.z Set the Paper Thickness Lever to the right.Rear Cover is not attached properly. If the Rear Cover is not reattached properly after it has been removed, it cancause paper jams. Press firmly on the Rear Cover until it is fit squarely in therear of the machine.Cause Action