COPYRIGHT © 2000 CANON INC. 2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000 3-35 TCHAPTER 3 STANDARDS AND ADJUSTMENTS8.4 Checking the Potential SystemTurn off the main power switch.1) Short CP106 and CP105 on the DC controller PCB.2) Disconnect the connector (J9010) used to connect betweenthe DC controller PCB and the potential control PCB.1) Disconnect the cable used to short CP106 and CP105 onthe DC controller PCB.2) Connect the connector (J9010) used to connect betweenthe DC controller PCB and the potential control PCB.Check to make sure that the potential control PCB issupplied with power; then, check the potential sensorusing the electrode designed for making checks.Turn off the main power switch.Turn on the main power switch.Forced executionof potential controlEnable potential control: COPIER>OPTION>BODY>PO-CNT=1.Check the laser output.Replace the laser unit.STARTNOYESNOYESYESNOTurn on the main power switch.NOChecking the Laser OutputIs the image better? AIs the laser output alimit value?YESReplace the photosensitive drum. If theproblem is not corrected, go to thechecking the laser output.Make the following selections in service mode(level of current of the primary charging assembly):COPIER>DISPLAY>HV-STS>PRIMARY.Convert the reading (mA) indicated during printinginto a control voltage with reference to 8.5"Potential Control Conversion Table."YESNOYESIs thedifference betweenthe actual measurement ofPR-CNT and 'PRIMARY' inservice mode ±10%?NOReplace thehigh-voltage transformer. Isthe problem corrected?Checking the Primary OutputReplace the DC controllerPCB.Replace the DC controllerPCB.Is the readingbetween 0 and 30?ENDMake the following selections inservice mode, and enter '1':COPIER>FUNCTION>DPC>DPC.Is the indication70 ± 15 V?Check the following indications:for copier images:COPIER>DISPLAY>DPOT>VL2Mfor printer images:COPIER>DISPLAY>DPOT>VL2M-PDisable potential control: COPIER>OPTION>BODY>PD-CNT=0Make the following selections in service mode:COPIER>DISPLAY>DPOT>DPOT-K.Disable potential control: COPIER>OPTION>BODY>PO-CNT=0Measure the voltage PR-CNT during copyingof J102A-11 on the DC controller PCB.Download Free Service Manual at http://printer1.blogspot.com
