Chapter 1313-9F-13-10Turn off the main power1. Disconnect the cable used to short the check pinson the DC controller PCB.2. Connect the connector used between the DCcontroller PCBs of the potential control PCB.turn off the main powerturn on the main powerStartNOYESturn on the main powerNOIs the imagebetter?YESYESNOYESIs the differencebetween the measured PR-CNTand 'PRIMARY' shown in servicemode +/-10%?NOTry replacing thehigh-voltage transformer. Isthe problem corrected?replace the DCcontroller PCB. replace the DCcontroller PCB.Is the value between0 and 30?EndADisable the potential control mechanismby entering '0' for the following:COPIER>OPTIONAL>BODY>PO-CNT.1. short CP33 on the controller PCB and GND.2. disconnect the connector used between DCcontroller PCBs of the potential control PCB.Make the following selections in service mode:COPIER>DISPLAY>DPOT>DPOT-KTurn off the potential control mechanismby entering '0' for the following:COPIER>OPTION>BODY>PO-CNT.Make the following selections in service mode(primary charging assembly current level):COPIER>DISPLAY>HV-STS>PRIMARY.Convert the value (in uA) indicated while printingis under way into a control voltage using thePotential Control Conversion Table.Try replacing the photosensitive drum.If the problem is not corrected, go to'Checking the Laser Output'.Measure the voltage HVT_PRIMARY ofJ102A-11 on the DC controller PCB whilecopying is under way.Check to make sure that the potential measurementPCB is supplied with power, and check the potentialsensor using a checking electrode.
