COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)II. LASER CONTROL CIRCUITA. OutlineFigure 3-201The laser control circuit serves to control the laser mechanism according to the videosignals (DVDO0 through 7*) from the printer board. The GA (IC204) on the DC controllerPCB generates video data signals (VDATO0 through 7) and image mode setting signal(PWMF1) using video signals from the printer board *1 and the image mode switch sig-nals (VDATIN8*) coming by way of the D-CPU (IC201).CHAPTER 3 LASER EXPOSURE SYSTEM3-3+G. A.(IC204)PD LDPWM IC(IC208)PWMF1LVDS IC(IC209)VDATA*UBLON+5VDATA*SAMPLE*(IC206)BDO* PCLKPCLKDC controller PCBBD PCBLaser driver PCB(IC1001)(IC1002)C1004DTOP*DLSYNC*DPRNT*DCMD*DVDO0~7*DVCLKVDATIN8*BD* VDATO0 Å`7BD*BDATA*, BDATABSAMPLE*, BSAMPLELENB*VDATIN0~7*D-CPU(IC201)RAM(IC205)Receiver ICBD sync ICCurrent/voltageconversion circuitSwitchingcircuitLaser currentsetting circuitReference voltageLaser drive ICDownload free service manual at http://printer1.blogspot.com
