The Error Code for Ricoh SP C720Hotsun Imaging Products Co., Ltd. is so pleased to find that the printer can identify the chip and page yield properly by the self-testing after being replaced by another chip, when testing the toner cartridge of Ricoh SP C720. When the sign of “ READY” displayed in the machine, the error code of SC681-X appeared immediately. The problem could not be solved by both a reset of the drum assembly and thermal transfer assembly. To have a further reset of fuser assembly, the problem still remained. At last, the problem was solved completely after changing another chip from another supplier’s. In a word, the error code for Ricoh SP C720 results from the chip.