Getting error c630 on a kycera mita1525

Hello sir; C630 require reset, procedure as follow;
1, press these key by order and keep holding down.
2 these keys are "stop/reset", "start", "left copy density"
3, press "stop/reset" key again.
4, enter 163, press start.
5, window will show out "CLE"
6, press start to clear.
7, press "stop/reset"key and 001 to exit.