Chapter 77-2F-7-17.1.3 Pre-Transfer Exposure LED 0010-8037iR7105 / iR7095 / iR7086The machine's processing speed is set to 500 mm/sec, thus enabling 105 prints/min (A4, 100%; iR7105). To make up for a drop in charging, the machine uses aphotosensitive drum capable of a high charging efficiency and a pre-exposure lamp emitting light of a short wave length (660 mm). A high process speed can alsoadversely affect static separation, which would lead to poor separation if left alone, and pre-transfer exposure LED is used to ensure correct separation.Reference:Pre-Transfer ExposureFunction: In the initial state of the transfer process, the machine decreases the photosensitive drum potential (background potential) in advance so as to reduce thestatic bonding between the photosensitive drum and the transfer medium, thus facilitating separation.Timing: 100 msec before the lead edge of the image reaches the point of activation of the pre-transfer exposure LED until the trail edge of the image moves pastthe point.7.2 Image Formation Process7.2.1 Overview 0011-3423iR7105 / iR7095 / iR7086The machine's image formation process consists of the following 8 steps:step 1 pre-exposurestep 2 primary charging (positive DC)step 3 laser exposurestep 4 development (AC + positive DC)step 5 transfer (negative DC)step 6 separation (AC + positive DC)step 7 fixstep 8 drum cleaning
