[. . . ] Align the notch on the end of the toner cartridge with the tab (a) in the image drum, then lower the toner cartridge into the image drum. [. . . ] Align the notch on the end of the toner cartridge with the tab (a) in the image drum, then lower the toner cartridge into the image drum. Use of a power cord NOT supplied with this printer, or an extension cord, may result in overheating, and could be a safety hazard. In order to reduce electromagnetic interference--"noise" that interferes with TVs or other appliances--you must place the included ferrite core on the network cable. If your printer has an optional second paper tray, duplex unit, hard disk drive, or additional memory installed, you must open the printer driver and activate the device. Note: Printer operation is not assured if another USB compatible device is connected concurrently with it. Note: If you are using USB, select BARTSCHER USB and disrepard step 4. [. . . ] Note: Printer operation is not assured if another USB compatible device is connected concurrently with it. [. . . ]