Introductionx-12 cm35216 Specifications6.1 Specifications ....................................................................................6-2cm3521 ...........................................................................................6-2ADU .................................................................................................6-4Option specifications ......................................................................6-4Reverse automatic document feeder 9228 .....................................6-4Paper feed cabinet 9275 .................................................................6-6Paper feed cabinet 9276 .................................................................6-6Paper feed cabinet 9277 .................................................................6-6Finisher 9270 ..................................................................................6-7Punch kit 9278 ................................................................................6-8Saddle stitcher 9279 .......................................................................6-8Output tray OT-601 .........................................................................6-8Mailbin kit MT-501 ..........................................................................6-97 Copy paper/originals7.1 Copy paper .........................................................................................7-2Possible paper sizes .......................................................................7-2Paper types and paper capacities ..................................................7-4Special paper ..................................................................................7-5Precautions for paper .....................................................................7-7Paper storage .................................................................................7-7Auto tray switch feature ..................................................................7-8Order for Selecting the Paper trays ................................................7-87.2 Selecting the paper settings .............................................................7-9To automatically detect the paper size(“Auto Paper Select” setting) ..........................................................7-9To specify a paper size (Set Size settings) ...................................7-11To specify a non-standard paper size (Custom Size settings) .....7-13To store a non-standard paper size (Custom Size settings) .........7-16To specify a setting for oversized paper(Oversized Paper settings) ............................................................7-19To specify a setting for special paper ...........................................7-22To print double-sided copies manually ........................................7-247.3 Originals ...........................................................................................7-26Originals that can be loaded into the ADF ....................................7-26Precautions for loading originals into the ADF .............................7-28Originals that can be placed on the original glass ........................7-29Precautions for Positioning Originals on the Original Glass .........7-298 Application functions8.1 Inserting paper between OHP (“OHP Interleave” function) ...........8-2To copy using the “OHP Interleave” function .................................8-3