Oki Data CONFIDENTIAL43967002TH Rev. 1 352 /7. Troubleshooting7.5.3.(7) All black page print(7-1) All black page print on paperCheck item Check work Action to be taken at NG(7-1-1) High voltage supply contacting conditionCH terminal Confirm that the terminal coming from thehigh voltage terminal keeps contactingwith the high voltage terminal of the ID unitnormally by visual check.Replace theterminal of the MPF.CH terminal Check that the high voltage terminal isin the good contacting condition on thehigh voltage PCB. Open the left coverand remove the high voltage PCB. Checkthat the terminal is installed in the normalinstallation condition.Re-install theterminal into thenormal condition.ID unit terminal Confirm that the ID unit high voltageterminal keeps contacting with the highvoltage terminal by visual check.(Refer to Fig. 7-3.)ID unit replacementor high voltageterminal repair Ifany attempt of usingnew ID unit as atrial is going to bemade, be sure touse the SystemMaintenance MenuFUSE KEEP MODE.(7-1-2) High voltage supply contacting conditionCH output When the high voltage probe is availableas a maintenance tool, open the left coverand check the CH output during printingfrom the soldering side of the high voltagePCB with a high voltage probe. (The highvoltage probe is not a general maintenancetool.)Replace the highvoltage PCB.GroundCharge rollerDeveloper rollerToner feed rollerFig. 7-3
