COPYRIGHT © 2000 CANON INC. 2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000 2-3 TCHAPTER 2 IMAGE ADJUSTMENT BASIC PROCEDURE3. Making Checks on the Printer Unit (2/2)Generate a halftone image.End.ATo check a copier image,See if No. 6 and No. 7 (halftone) of the Test Chart isreproduced to the more or less the same density.To check a printer (PDL) image,See if the density of the halftone area represents theoriginal data properly.Is the halftonedensity optimum?NOIs the densitytoo low or too high (toolight or too dark)?Are thereadings ± 6 V of thetarget value?(*1)Adjust the offset of the VD target potential.YESYESNONOYESNOYESYESNOGenerate a solid black print.Check the following readings in service mode:COPIER>DISPLAY>DPOT>VL1M (for copier image)COPIER>DISPLAY>DPOT>VL1M-P (for printer image)Check the following readings in service mode:COPIER>DISPLAY>DPOT>VL2M (for copier image)COPIER>DISPLAY>DPOT>VL2M-P (for printer image)Check the following readings in service mode:COPIER>DISPLAY>DPOT>VDM (for copier image)COPIER>DISPLAY>DPOT>VDM-P (for printer image)Check the following, and replace them ifnecessary:1. Laser (for output)2. Potential control system3. Photosensitive drumCheck the following, and replace them ifnecessary:1. Laser (for output)2. Potential control system3. Photosensitive drumCheck the primary chargingsystem; if normal, replace thephotosensitive drum.Adjusting the Offset Value of the VD Target Potential(VD-OFFSET/VD-OFFSET-P)COPIER>ADJUST>V-CONT>VD-OFST (for copier image)COPIER>ADJUST>V-CONT>VD-VD-OFST-P (for printer image)DefaultLighter image Darker imageAre thereadings ± 6 V of thetarget value?(*2)Are the readings70 ± 15 V?-5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5REF.*1:VD target valueCOPIER >DISPLAY >DPOT >VDT (for copier image)COPIER >DISPLAY >DPOT >VDT-P (for printer image)*2:VL1 target valueCOPIER >DISPLAY >DPOT >VD1T (for copier image)COPIER >DISPLAY >DPOT >VD1T-P (for printer image)Download Free Service Manual at http://printer1.blogspot.com
