[. . . ] Lift-Off correcting cassettes have a yellow cut-out on the lower right. See "Supplies and Accessories. " H Correctable H Multi-Strike Film with Cover-Up Correction When using Multi-Strike film ribbon cassettes, use Smith Corona CoverUp correcting cassettes. See "Supplies and Accessories. " Smith Corona Corporation Care and Maintenance -- 7-1 Removing the Ribbon Cassette Replace the ribbon cassette when a different colored portion begins to unwind from it. [. . . ] Guide the correcting tape between the printwheel and the typing guide and position the left gear wheel on the left mount and the right gear wheel on the right mount. IMPORTANT: After the cassette is mounted, tighten the slack in the tape by moving the plastic lever toward the platen. The lever is located under the left side of the cassette towards the platen. Be sure it is closed securely. The unit should automatically reinitialize. If this does not occur, check to make sure the sound shield is closed securely and, if necessary, turn your machine off, and then on again. Smith Corona Corporation Care and Maintenance -- 7-3 Printwheels Removing the Printwheel 1. Pull the lever forward until the print hammer mechanism springs away from the printwheel. Drop the printwheel between the print hammer and the typing guide with the type style name facing you. 2. 4. Push the print hammer release lever back until the print hammer mechanism snaps into place. If this does not occur, check to make sure the sound shield is closed securely and, if necessary, turn your machine off, and then on again. 7-4 -- Care and Maintenance Smith Corona Corporation Cleaning Do not attempt to disassemble the typewriter to clean it. IMPORTANT: Always unplug the machine before using cleaning solutions on its surfaces. Printwheel To remove residue, dip the characters into a small container of ethyl or isopropyl alcohol (rubbing alcohol) and wipe with a clean dry cloth. Do not soak the printwheel. Platen Wipe the surface with a clean cloth dampened with ethyl or isopropyl alcohol (rubbing alcohol). Cover /Keyboard /Sound Shield To clean the cover or keyboard, sponge with a mild ammonia or soap solution. WARNING: Keep all solvents and petroleum distillates (gasoline, kerosene, lighter fluids, etc. ) away from plastic parts. Keep all cleaning solutions away from electrical components and moving parts. Check Points If your typewriter does not function properly, check the following: Is the typewriter plugged into a live socket? Are the printwheel, ribbon cassette and the correcting cassette properly installed?If the typewriter still does not work properly after checking the above, contact your nearest Smith Corona Service Center. Smith Corona Corporation Care and Maintenance -- 7-5 Obtaining Service If you are experiencing difficulty, before returning the unit for service, call Consumer Affairs, toll-free at 1- 800- 448- 1018, for assistance. Customer Service Representatives are available to assist you Monday through Friday, from 8:00 AM to 6:00 PM. [. . . ] In large letters, address the package for shipment to the nearest service location. Remember to include your return address and retain your shipping receipt. If you do not have the original packing materials: 1. Place at least 2" of packing material in the bottom of the box for cushioning. [. . . ]