Toner cartridge manufacturing codes Heat-stamped on the toner cartridge, opposite the label-end of the cartridge, is a manufacturing code. If a portion of the code does not match the list below, replace the toner cartridge. Use toner cartridges that contain any of the following manufacturing codes: 9I 9J 9K 9L any cartridge that begins with the numbers 0 through 6 in place of the 9 456 Chapter 7 - Troubleshooting EN