Canon i-SENSYS LBP5300 Series Service Manual

Also see for i-SENSYS LBP5300 Series: User guide User guide

Contents

Chapter 22-282.5.2.5 Warp control 0013-8260/ i-SENSYS LBP5360 / i-SENSYS LBP5300The purpose of the warp control is to prevent an image defect and paper transport defect by keeping with specified paper warp before fixing unit.If the rotational speed of the fixing pressure roller is slower than that of the ETB, the paper warp is increased and image defect or paper crease possibly occurs.Conversely, if the rotational speed of the fixing pressure roller is faster than that of the ETB, the paper warp is decreased and color misregistration in sub-scanningdirection occurs, as the fixing pressure roller pull the paper running.In order to solve above problems, the paper warp sensor (SR6001) is equipped in the fixing/delivery unit in order to keep the fixing motor (M1) speed properlydepending on the output signals from the SR6001.The DC controller determines the paper warp is small, when the paper warp sensor (SR6001) is OFF, and it slows the rotational speed of the fixing motor (M1).Conversely, it rotates the M1 at regular speed, when the SR6001 is ON in order to speed up the the fixing pressure roller.Accordingly it maintains the paper warp at specified amount by changing the feeding speed of the fixing pressure roller.F-2-362.5.2.6 Fixing roller pressurizing/release control 0013-8270/ i-SENSYS LBP5360 / i-SENSYS LBP5300This printer controls the pressure between the fixing sleeve and the fixing pressure roller in three stages: "pressurized", "released", and "slightly pressurized".The "pressurized" condition is for during normal printing operation.The "released" condition is for the purpose of preventing the fixing sleeve damage in case of jammed paper is pulled out forcibly as well as preventing deformationof the fixing sleeve and the fixing pressure roller in case of leaving them for a while. When a jam occurred in the fixing unit, the DC controller switches the conditionto the "released" before it stops the printer under jam status. It also switches to the "estranged", when going into the SLEEP mode and turning OFF the power switch.The "slightly pressurized" is the intermediate condition between pressurized and released, and used for printing envelopes.The fixing motor can rotate clockwise and can also reverse. It drives the fixing pressure roller when rotating clockwise, conversely, it drives the pressure releasemechanism of the fixing pressure roller when rotating counter clockwise.Fixing roller pressurized/estranged mechanismThe pressurized condition of the fixing pressure roller is controlled by the mechanism described above and the characteristic shape of the fixing pressure releasecam.- Pressurized conditionThe minimum radius position of the fixing pressure release cam does not engage with the pressure arm, so that the fixing sleeve is pressurized to the fixingpressure roller at maximum force by the pressure spring.- Estranged conditionThe maximum radius position of the fixing pressure release cam is engaged with the pressure arm, so that the fixing sleeve is pushed down by the pressurecam and estranged from the fixing sleeve.- Slightly pressurized conditionThe intermediate radius position of the fixing pressure release cam is engaged with the pressure arm, so that the fixing sleeve is slightly pressurized to thefixing pressure roller.The driving force of the fixing motor transmits to the fixing pressure release cam by the oneway mechanism. Therefore the rotational direction of the cam is one-way and the pressurized condition is switched in order of "pressurized", "estranged", and "slightly pressurized".Transparency Transparency 1/2Paper type Weight Paper type SpeedFixing pressure rollerFixing sleevePaper warp sensorPaper warp sensor flagETBPaperFixing pressure roller rotational speedis faster than ETB feeding speedFixing pressure roller rorational speedis slower than ETBfeeding speed