3. OPERATION AND TIMINGCOPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)3-72F. Laser DriverFigure 3-417 shows the laser driver PCB used to generate the laser drive signal from video signals. Thecircuit drives the semiconductor laser units, and the laser power adjustment PCB monitors and controls theintensity of the laser beam. Each of these PCBs has the following functions:Laser Driver PCB1 Generates the laser drive signals for 400 lines/200 lines/266 lines.2 Turns ON/OFF the laser.3 Selects activation mode.Laser Power Adjustment PCB1 Monitors laser intensity.2 Generates activation current.3 Detects errors in activation current.Figure 3-417+5VLaser beamIntensity monitorLaser power settingActivation current generationSignal generation for 200 lines/266 lines8Video signalSignal generation for 400 linesLaser drive signalError signalLaser driver PCBLaser power adjustment PCBMode signalVideo controller PCBSelector
