apple Apple PLW 300 320 & LW 4 600 PS Service Source free download

File name Apple PLW 300 320 & LW 4 600 PS Service Source.pdf

K Service Source PLW 300 & LW 4/600 PS Personal LaserWriter 300, Personal LaserWriter 320, LaserWriter 4/600 PS K Service Source Basics PLW 300 & LW 4/600 PS Basics Paper Paths - 1 Paper Paths There are two paper paths in this family of printers. Paper is fed from the paper cassette or manual-feed slot and delivered to the face-down tray or the face-up delivery slot. When the paper delivery selector is in the up position, paper is delivered face-down. When the selector is in the down position, paper is delivered face-up. Default delivery is face-down at the top of the printer. Basics Paper Paths - 2 Delivery Roller Toner Cartridge Paper Delivery Selector Transfer Roller Fuser Pickup Roller Face-Down Path Toner Cartridge Transfer Roller Fuser Pickup Roller Face-Up Path Basics Sensing System Theory - 3 Sensing System Theory There are four paper sensors in this family of printers: PS304, PS303, PS302, and PS301. PS301 Controller Assembly PS303 PS304 PS302 Basics Sensing System Theory - 4 Each consists of an actuator and a U-shaped photo interrupter that is soldered to the controller assembly. If the actuator is present inside the U, the circuit closes; if the actuator is absent, the circuit opens. In ready state the appropriate circuit is closed. The paper sensors are actuated as an arm or lever swings against the paper as it moves through the printer. Sensor Functions The cassette empty sensor PS304 detects whether there is paper in the cassette tray. If the printer is set for cassette feed and the cassette is empty, sensor PS304 determines that a paper-out condition exists. Registration paper sensor PS302 detects the presence of paper in the manual-feed slot and detects misfeeds of both Basics Sensing System Theory - 5 cassette-fed and manual-fed paper. If the paper does not reach the top position of this sensor in the required time, the printer determines that a pick-up delay jam has occurred. Winding pape