You need to press the following keys in quick succession – MENU # 1 9 3 4. Then you should see a message on your display saying ‘TECH.’ Then again select the MENU key followed by ENTER. The display will now show ‘TECH MODE.’
Then select the ‘<’ key two times. Your operator panel should show ‘NEW CARTRIDGE’. Then select ENTER. Now the panel will show [YES]. Select ENTER key again. You can exit from this mode by pressing MENU # 1 9 3 4 again one after another.