Canon Color Image Reader - L1 Service Manual

Also see for L1: Installation procedures Instructions

Canon Color Image Reader - L1 Service Manual Manual pdf 17 page image

2-62-622 TechnologyTechnologyControlsScanner drive controlConfi guration of drive systemFollowing is the parts confi guration related with scanner drive system.ACOM, BCOMHPReader controller PCBScanner motor (M1)Scanner unitScanner home positionsensor (SR2)Component parts Symbol FunctionScanner motor M1 Control of the drive/stop, direction and speed of motor rotationScanner unit HP sensor SR2 Scanner unit HP detectionScanner unit - Image reading, analog image processingScanner motor controlFollowing is the control system confi guration related with the scanner motor control.Motor driver on the reader controller PCB controls the drive/stop, direction and speed ofscanner motor rotation in accordance with the signals from CPU.1) Backward operation after image scanningBackward operation after image scanning until shading position of scanner unit is control-led by 468 mm/sec regardless of color mode.2) Forward operation at image scanningAt image scanning, the following motor control controls the scanner unit operation.Start positionAccelerationImage leading edgeNormal speedImage trailing edgeDecelerationStopShiftspeedShift length[1] [2] [3] [4][1] Acceleration Zone: accelerates to suit the selected mode.[2] Approach Zone: moves for speed stabilization.[3] Image Read Zone: reads the image at a specific speed.(if black-and-white/SEND mode, twice as fast as in full-color mode.)[4] Deceleration Zone: past the image trailing edge, immediately decelerates and stops.