HP 2600n Service Manual - Page 67

SR4 Fuser delivery paper sensor SR5 Pre-fuser paper sensor SR8 Paper width sensor SR9 Pressure alienation sensor M1 Main motor M2 Fuser/Delivery motor M3 Pickup motor SL1 Cassette pickup solenoid SL2 Magenta, cyan, and yellow developing cylinder drive solenoid SL3 Black developing cylinder drive solenoid Manual feed slot pickup mechanism This mechanism picks up one sheet of paper only that is inserted into the manual feed slot and then into the printer. This printer does not have a pickup roller in the manual feed slot. Instead of a pickup roller, the registration roller picks up paper. The presence of paper in the manual feed slot is detected by the manual feed slot paper sensor (SR3). The following is the operational sequence of the manual feed slot pickup. 1 If paper is set into the manual feed slot during STBY mode, the manual feed slot paper sensor (SR3) detects it. 2 When the paper is detected, the DC controller drives the pickup motor (M3) for 5 seconds. The paper is fed approximately 5 mm (0.2 inch) and is then caught by the registration roller. 3 After the above operational sequence, the paper is fed by the drive of the registration roller. Paper feed mechanism This mechanism feeds one sheet of picked up paper to the fuser. There is a paper width sensor in the paper transport path to prevent temperature rise at the end of the fuser. It detects paper with widths of shorter than 190 mm (7.5 inches). The following is the operational sequence of paper feed. 1 Paper skew is corrected by the registration shutter when the paper is fed into the printer. 2 Toner is transfered to the paper from the photosensitive drum and then the paper is fed to the fuser/delivery stage. Skew correction by the registration shutter If the paper fed into the printer is skewed, when it hits the registration shutter, it will be adjusted. Figure 4-13 Skew correction illustrates how skewed paper is corrected by the registration shutter. ENWW Pickup and feed system 53