Description: The cassette is open in the option paper feeder.
Code: -
Display: Top cover Open
Description: Interlock (SW2 on KP-373/418 [AC] board) is open.
Code: -
Display: Opt. feeder 1 (2) rear cover Open
Description: The rear cover of the frist (second) option feeder is open.
Code: -
Display: Developer unit connection error
Description: The developer connector is loose or not connected.
Code: -
Display: Replace Toner kit TK-12 feeder.
Description: Toner in the developer has been exhausted and the toner concentration in the developing powder is not restorable. The printer does not operate when this message is displayed.’c