Information to Have Ready When Contacting Us Have the following information ready to ensure smooth service. Product name (MF746Cdw / MF745Cdw / MF743Cdw / MF741Cdw / MF656Cdw / MF654Cdw / MF653Cdw / MF652Cw / MF644Cdw / MF642Cdw / MF641Cw / MF543dw / MF455dw / MF453dw / MF452dw / MF451dw / MF449dw / MF448dw / MF445dw) Dealer where you purchased the machine