Lexmark C720 User's Guide - Page 135

24 Solving printing problems Some printer problems are very easy to solve. If your printer is not responding, first make sure: • The printer cable is securely attached to the printer and the host computer. • The power cord is plugged into the printer and a properly grounded electrical outlet. • The printer is turned on. • The electrical outlet is not turned off by any switch or breaker. • The printer front, top, and rear doors are completely closed. • All printer options are properly installed. Once you've checked each of these possibilities, turn the printer off and back on. This often fixes the problem. If a message appears on the operator panel display, see Understanding printer messages for more information. If the message indicates the printer has a paper jam, see Clearing paper jams. If you are having trouble determining the source of the problem, see Print quality problems for other suggestions. The information in the following tables may help you solve printing problems. If these suggestions do not correct the problem, call for service. You may have a printer part that requires adjustment or replacement. Toner cartridge problems Problem You cannot insert a toner cartridge into the printer. Toner accumulates inside the printer. Action Make sure the toner cartridge is aligned properly and is being installed in the correct location. See Replacing toner cartridges for more information. Replace the toner cartridge that matches the color of the toner that has accumulated inside the printer. See Replacing toner cartridges. 135