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Such failure occurs , you should first make routine checks to see Lord with electrical appliances and the transfer belt is obvious damage, such as the corona wire Bengduan , plastic parts breakdown , as well as the drum is rotating , scanning lamp brightness how . Meanwhile , also inquires skill model used toner , the time of adding the carrier and the like. If you exclude the above factors , you should do the following: Open the front fuselage cover, switch plate to the door switch is turned on , so that the equipment is properly energized . Place the originals on the glass , let the power go paper when paper fed to the bottom of the drum , turn off the machine , remove the drum , to check whether there is an image on the drum , if any image , indicating that the problem lies in the transfer section If no image , indicating that the electrical part of the problem lies in the developing part of the main belt.2J9service manual download site
Developing part failure, mainly for two reasons : ( 1 ) developing roller drive clutch failure , the developing roller can not rotate , it may be due to improper adjustment , resulting in a gap between the blade and the developer roller is too small , causing the clutch can not be driven by developing roller. ( 2 ) For some models of copiers , such as Canon np-270, developed by the locking lever is pressed against the photosensitive drum ( to maintain a certain gap ) , due to the rotation of the locking lever operator , the action too much too fast , causing distortion of the lock lever , the developer can not lock , the photosensitive drum and the developing roller gap is too large , the toner is not attracted to the photosensitive drum , the copy will appear blank .
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