Chapter 77-27.1.3 Pre-Transfer Exposure LED 0010-8037The 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 a photosensitive drum capable of a high chargingefficiency and a pre-exposure lamp emitting light of a short wave length (660 mm). A high process speedcan also adversely affect static separation, which would lead to poor separation if left alone, and pre-trans-fer 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 poten-tial (background potential) in advance so as to reduce the static bonding between the photosensitive drumand 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 ex-posure LED until the trail edge of the image moves past the point.7.2 Image Formation Process7.2.1 Overview 0011-3423The machine's image formation process consists of the following 8 steps:F-7-2step 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 cleaning8. Drum charging1. Pre-exposure2. Primary charging 3. Laser exposure4. Development5. Transfer6. Separation7. FixingDeliveryDeck/cassetteRegistrationManual feed trayflow of paperdirection of drum rotationStatic Image Formation Block
