Xerox Phaser 3155 User Manual
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2 Chapter Theory of Operation In this chapter... • Operational Overview •Paper Path Downloaded From ManualsPrinter.com Manuals
2-2Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Operational Overview The Phaser 3140/3155/3160 is a monochrome printer that has a single-pass laser design architecture, which offers mono print speed up to 24 pages per minute (ppm), and resolution up to 1200 x 1200 dots-per-inch (dpi) image quality. The printer provides a USB interface for all models, and the 3160N supports 10/100 Base-TX ethernet. System Overview The location of the printer’s primary functional components is shown in the following illustration. s3160-065 Output Bin Full Sensor Paper Exit Sensor Paper Empty Sensor Tray Paper Feed Sensor Cover Open Sensor Manual Feed Sensor Transfer Roller Manual Feed Slot Print Cartridge Laser Unit Fuser Downloaded From ManualsPrinter.com Manuals
Phaser 3140/3155/3160 Printer Service Manual2-3 Theory of Operation Paper Path The media supplied from the Paper Tray is transported through the printer as shown in the illustrations below. Media fed from the manual feed slot enters the media path at the Feed Idle Roller. Paper Feeding The feeding mechanism consists of the manual feeder, Paper Tray, Pick Up Roller, Feed Rollers, and Holder Pad. The rollers and sensors in the paper feed path control paper registration and guide the paper through the image transfer, image development, image fusing, and exit assemblies. s3160-082 Output Bin Full Sensor Paper Exit Sensor Paper Empty SensorPaper Feed SensorCover Open Sensor Manual Feed Sensor Pick Up Roller Feed Roller Feed Idle Roller Manual Feed Slot Downloaded From ManualsPrinter.com Manuals
2-4Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Paper Tray In the Paper Tray, paper is separated by the Holder Pad mounted to the center of the tray. Both the side guide and the rear guide can be adjusted for various paper sizes. The Paper Empty Sensor detects when the Paper Tray needs to be loaded with paper. Tra y H o l d e r Pa d Individual sheets are separated by the Tray Holder Pad in the Paper Tray. When paper feeds into the printer, it passes over the Tray Holder Pad Assembly which uses a spring loaded friction pad to separate the sheets of paper. Manual Feeder The manual feeder is used to hold non-st andard or custom paper sizes and special media (envelopes, transparencies, etc.). The manual feeder can hold 1 sheet of paper or 1 envelope. s3160-077 s3160-153 Downloaded From ManualsPrinter.com Manuals
Phaser 3140/3155/3160 Printer Service Manual2-5 Theory of Operation Pick Up Roller The Pick Up Roller is used to pick up and feed paper into the printer and remove static charge on the paper. The Pick Up Roller is driven by the Pick Up Solenoid. Feed Roller (Registration) The Feed Roller controls paper registration and guides the paper into the printer. s3160-090 Pick Up Roller s3160-089 Downloaded From ManualsPrinter.com Manuals
2-6Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Drive Assembly The Drive Assembly receives power from the Controller Board. The Drive Assembly consists of the main motor and ge ar set mounted to a support plate. • Motor: 24V DC • Driving Frequency: 2200 rpm s3160-084 3155 & 3160 3140 Downloaded From ManualsPrinter.com Manuals
Phaser 3140/3155/3160 Printer Service Manual2-7 Theory of Operation Laser Unit The Laser Unit is the core part of the Phaser 3140/3155/3160 and is controlled by the video controller circuitry of the Controller Board. The Laser Unit converts video data received from the Controller Board into an electrostatic latent image on the surface of the OPC drum. This is achieved by controlling the laser beam and exposing the surface of the OPC drum to the laser light. A rotating polygon mirror reflects the laser light onto the OPC drum. Each face of the mirror produces one scan line. The OPC drum rotates at the same speed as the paper feeding speed. As the OPC drum turns, the laser sc ans creating the full page image. The Horizontal Sync (HSYNC) signal is created when the laser beam from the Laser Unit reaches the end of the polygon mirror and the signal is sent to the Controller Board. The controller detects the HSYNC sign al and adjusts the vertical line of the image on paper. After the HYSNC signal is detected, the image data is sent to the Laser Unit to adjust the left margin on the paper. Transfer Roller The Transfer Roller applies a positive char ge to the rear surface of the paper. The negatively charged toner image on the Printer Cartridge OPC drum is attracted to the positive charge on the rear surface of the paper, causing the image to be transferred from the surface of the drum onto the paper. For more information, see “Print Cartridge” on page 2-8. s3160-087 s3160-083 Downloaded From ManualsPrinter.com Manuals
2-8Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Print Cartridge The Print Cartridge is an integral unit containing the OPC unit and toner unit. The OPC unit consists of the OPC drum and charging roller. The toner unit consists of toner, supply roller, developing roller, and cleaning blade. • Developing method: Non-magnetic 1 element contacting method • Toner: non-magnetic 1 element shatter type toner • Toner Life: 1,000 pages/2,500 pages (ISO 19752 Pattern/A4 Standard) • Toner Residual Sensor: Dot count with CRUM(CRU Monitor) • OPC cleaning blade • Management of waste toner: Collects toner using the cleaning blade. • OPC drum protecting shutter: No • Toner CRUM reader: Identifies whether toner is Xerox branded toner or whether a non-Xerox Print Cartridge is installed. s3160-076 Cleaning Roller Cleaning Blade Max. -350V Max. -550V Max. +5KV Max -1.4KV Zener Diode -100V Charging Roller Laser V 0 : -720V V L : -150V Doctor Blade Developing Roller Supply Roller Transfer Roller OPC Drum s3160-088 Downloaded From ManualsPrinter.com Manuals
Phaser 3140/3155/3160 Printer Service Manual2-9 Theory of Operation Fuser The Fuser consists of a Halogen Lamp, Heat Roller, Pressure Roller, Thermistor, and Thermostat. The Heat Roller transfers he at from the lamp to the paper. The Pressure Roller adheres the melted toner to the media surface. The Thermistor and Thermostat monitor Fuser operating temperature. Halogen Lamp •Voltage • 120V: 115 V ± 5% • 220V: 230 V ± 5% • Capacity: 750 Watt ± 25 W Thermistor The Thermistor detects the temperature of the heating unit and feeds the data to the main processor. Thermostat When the Heat Lamp becomes too hot, the Thermostat cuts off power to the lamp to prevent overheating. Heat Roller The Heat Roller transfers heat from the lamp to the paper. As the paper passes between the Heat Roller and Pressure Rollers, the toner is melted and permanently fixed to the paper. The surface of the Heat Roller is coated with Teflon, so that toner does not stick to the surface. Thermistor Thermostat Heat Roller Pressure Roller Halogen Lamp (inside Heat Roller) Pressure Roller (behind Heat Roller) s3160-086 Downloaded From ManualsPrinter.com Manuals
2-10Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Pressure Roller The Pressure Roller is made of a silicon resin and the surface is coated with Teflon. When media passes between the Heat Roller and the Pressure Roller, toner is melted and permanently fixed to the surface of the paper. Safety Features Several protection devices are used to prevent Fuser overheating: • Hardware cuts off Fuser power when overheating is detected. • Software cuts off Fuser power when overheating is detected. • Thermostat cuts off power to the lamp. Interlocks disable the Fuser, motor, and Laser Unit. • Fuser power is cut off when the front cover is opened. • Fuser cover temperature is maintained at less than 80° C. Electrical Components The printer’s major electrical components consist of these boards: • Control Panel • Controller •Power Supply Controller Power SupplyControl Panel s3160-091 Downloaded From ManualsPrinter.com Manuals