Oki Data CONFIDENTIAL43967002TH Rev. 1 342 /7. Troubleshooting7.5.2. (14) Option unit cannot be recognized.(14-1) Duplex unit cannot be recognized.Check item Check work Action to be taken at NG(14-1-1) Duplex PCBDuplex motor Check if the Duplex unit of MC860specification is being used or notReplace the Duplexmotor.(14-1-2) Check the system connectionCheck the systemconnection fromthe PU PCB to theDuplex PCB (V7YPCB).Check that the cable between the PU PCBoption connector to the Duplex PCB isnormally connected.Correct theconnections.Square connectorconnecting theDuplex unit to theprinter.Check if any foreign material exists in theconnecting portion of the square connector.Remove the foreignmaterial.Square connectorconnecting theDuplex unit to theprinter.Is the terminals of the square connectordamaged?Replace theconnector.(14-1-3) Check the control signals.Check the controlsignal that is outputfrom the PU PCBto the Duplex PCB(V7Y PCB).Check the control signal that is output fromthe PU PCB option connector .pin-6: TXD (PU DUP)pin-4: RXD (DUP PU)Replace the PUPCB.(14-2) 2nd tray unit cannot be recognized.Check item Check work Action to be taken at NG(14-2-1) 2nd PCB2nd tray unit Check if the 2nd tray unit of MC860dnspecification is being used or not.Replace 2nd trayunit.(14-1-2) Check the system connectionCheck the systemconnection from thePU PCB to the 2ndtray unit (V7Y PCB).Check that the cable between the PU PCBoption connector to the 2nd tray unit isnormally connected.Correct theconnections.Square connectorconnecting the2nd tray unit to theprinter.Check if any foreign material exists in theconnecting portion of the square connector.Remove the foreignmaterial.Square connectorconnecting the2nd tray unit to theprinter.Is the terminals of the square connectordamaged?Replace theconnector.(14-2-3) Check the control signals.Check the controlsignal that is outputfrom the PU PCBto the 2nd tray unit(V7Y PCB).Check the control signal that is output fromthe PU PCB option connector .pin-5: TXD (PU 2nd)pin-3: RXD (2nd PU)Replace the PUPCB.
