M7020打印机显示我Open the front Cover and remove the Drum then rem

M7020打印机显示我Open the front Cover and remove the Drum then rem 打印机显示“open the front cover and remove the Drum,then remove j 兄弟一体机DCP-7010,打印机显示“open the front cover and remove the Drum Open the front Cover and remove the Drum then remove jammed open the front cover and remove zhe drum,then remove jammed 联想M3120显示:open the front cover and remove the drum.clean the M3120更换硒鼓墨盒后显示Dust on drum open the front cover and remove t 联想(lenovo M3120)打印机显示：Dust on Drum.Open the front Cover and Dust on Drum.Open the front Cover and remove the Drum.Clean Front cover and remove the drum,then remove jammed paper翻译成中 Open the Front Covrr and remove the Drum,then remove jammed m7020联想打印机出现以下提示:cover is open close the front cover请问是什么意思,