公开(公告)号：US20170219975A1

公开(公告)日：2017-08-03

申请号：US15491276

申请日：2017-04-19

Applicant: S-Printing Solution Co., LTD.

Inventor： Chang-keun SEO ,  Jin-boo KIM ,  Youn-jae KIM

IPC: G03G15/00

CPC classification number: G03G15/50 ,  G03G15/0863 ,  G03G15/553 ,  G03G21/1882 ,  G06F1/08 ,  G06F3/0604 ,  G06F3/0629 ,  G06F3/0653 ,  G06F3/0673

Abstract: A customer replacement unit monitor (CRUM) unit that can be mounted in an image forming apparatus includes a decoder which receives first clock signals from the image forming apparatus and converts the first clock signals into second clock signals, a memory which stores data related with a consumable unit, and a controller which manages the memory based on data signals transmitted from the image forming apparatus and the second clock signals. The first clock signals are divided into a data section in which the data signals are transmitted and received and an idle section in which the data signals are not transmitted and received. The first clock signals have a first frequency on the data section while having a second frequency on the idle section, and the second clock signals are clock signals maintaining a high value or a low value on the idle section.