10-Digit Desktop Printing Calculator (650-0752) Care and Maintenance Faxback Doc. # 16962 Your Radio Shack EC-3029 10-Digit Desktop Printing Calculator is an example of superior design and craftsmanship. The following suggestions will help you are for your calculator so you can enjoy it for years. Keep the calculator dry. If it gets wet, wipe it dry immediately. Liquids might contain minerals that can corrode the electronic circuits. Handle the calculator gently and carefully. Dropping it can damage circuit boards and cases and can cause the calculator to work improperly. Use and store the calculator only in normal temperature environments. Temperature extremes can shorten the life of electronic devices and distort or melt plastic parts. Keep the calculator away from dust and dirt, which can cause premature wear of parts. Wipe the calculator with a damp cloth occasionally to keep it looking new. Do not use harsh chemicals, cleaning solvents, or strong detergents to clean the calculator. Modifying or tampering with the calculator's internal components can cause a malfunction and might invalidate your calculator's warranty. If your calculator is not performing as it should, take it to your local Radio Shack store for assistance. REPLACING THE ROLLER The printer in this calculator uses a disposable ink roller cartridge. To maintain clear printing, change the ink roller after using about eight rolls of printing paper. You can order additional ink cartridges from your local Radio Shack store. CAUTION: Never try to reuse the ink roller by adding a solvent or liquid ink to it. This could damage the printer. 1. Remove the printer cover by pushing it in the direction of the arrow. 2. Grasp the retainer pin marked PULL UP and lift it out. 3. Install the new retainer pin and ink roller cartridge. 4. Replace the printer cover.