Oki Data CONFIDENTIAL43827101TH Rev.2 186 /(1-2)The first line is black display in LCDConnection between low-voltage power supply unit andPU PCBCord ASSY interconnectingthe low-voltage power supplyunit and the PU PCBConnection between PU PCBand operator panel PCBFFC interconnecting the PUPCB and the operator panelPCB.I/F signal from PU PCB tooperator panel PCBI/F signal from operator panelPCB to PU PCBConfirmation Items(1-2-1) Check of connections(1-2-4)Check of LSI operationConfirmation TasksCheck to see if the cord from the lower-voltage power supply isconnected properly to the POWER connector of the PU PCB.Check for any incomplete connection or skew insertion.Check to see if the cord has any wire breakage.Check to see if the cord has any peel-off of the covering.Check for any fault in the cord ASSY, such as dislocated wire,etc.Check to see if the wires are properly connected on a 1-pin to 1-pin basis.Check to see if the 7-pin FFC is properly plugged into the OPEconnector of the PU PCB.Check to see if the 7-pin FFC is properly plugged into the CNconnector of the operator panel PCB.Check for any incomplete connection or skew insertion.Check for wire breakage with a circuit-tester. Also, checkvisually for peel-off of the covering.Check to see if there is signal output through the OPEconnector of the PU PCBPin 1: CLKPin 4: Transmitting data (Transmission of PU PCB)Pin 6: CLRThe signal is permanently output if the PCB is normal.Check to see if there is signal output through the OPEconnector of the PU PCBPin 3: Receiving data (Reception of PU PCB)The signal is permanently output if the PCB is normal.Action at NGRedo the insertion ofthe cord properly.Replace the cord with anormal one.Redo the insertion ofthe cord properly.Replace the FFC with anormal one.Replace the operatorpanel PCB.Replace the operatorpanel PCB.
