Lexmark X 850 Owners Manual
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General information1-69 7500-XXX Exit 2 Exit 2 drive motor The rotating force of the exit 2 drive motor is transmitted through the gears to components that need mechanical driving force as shown below. The transmitted driving force drives the exit 2 media transport roll assembly and the exit 2 media exit roll assembly through the gears. Exit 2 drive motor Exit 2 drive gear 19T Exit 2 drive gear 19/44T Exit 2 drive gear 19T Exit 2 media transport roll asmExit 2 drive gear 19T Exit 2 media exit roll asm
1-70MFP Service Manual 7500-XXX Media transport Media transport path With the exit 2 installed, media is supplied from the MPF, tray 1, or tray 2 and is transported to the printer along the media transport path shown below. MPF MPF pick roll MPF Transport Roll ASM MPF ASMMedia feed unit ASMMedia feed unit ASM Pick roll Pick roll Separation roll Separation roll Feed roll Media transport roll ASM Registration roll ASM Transfer roll ASM PC cartridge Drum Heat roll Pressure roll Fuser unit ASM Exit 1 media exit roll ASM Duplex media transport roll ASM Duplex mediaCenter transport roll ASM Exit 2 media transport roll ASM Exit 2 media exit roll ASMTray 1Tray 2 Exit 1 Exit 2Feed roll
General information1-71 7500-XXX Layout of media transport path The following figure illustrates the main components directly associated with the media path and transport with the exit 2 installed. Functions of Main Components Drive motor The drive motor is a stepping motor driving the transport roll assembly and media exit roll assembly. Forward rotation of this motor drives these rollers to feed media to the exit 2 standard bin. Reverse rotation of this motor drives the transport roll assembly to feed media to the duplex. Media shift motor The media shift motor is a stepping motor moving the media exit roll assembly frontward or rearward. Forward rotation of this motor moves the media exit roll assembly to the front side. Reverse rotation of this motor moves it to the rear side. Duplex media transport roll ASM MPF MPF Transport pinch roll MPF Transport roll ASM Transport roll ASM Media transport pinch roll Separation rollFeed roll Duplex media center transport roll ASM Duplex media transport pinch roll Duplex media transport roll ASM MPF pick rollRegistration roll ASM Pick rollRegistration pinch roll Drum Transfer roll ASM Heat Roll Exit 1 media exit pinch rolls Exit 1 media exit roll ASM Exit 2 media transport roll ASM Exit 2 media exit pinch rolls Exit 2 media exit roll ASM Pressure roll Exit 2 Duplex TR AY 4 TR AY 3 (TTM) Tandem tray S
1-72MFP Service Manual 7500-XXX Exit interface card assembly (located in the printer) The exit interface card assembly contains a CPU and controls media feed in the exit 2 upon receiving a command from the printer engine card assembly and sensor/switch information. Exit 2 left door assembly The left door assembly detects open/close of the exit 2. Sensor (exit 2) The sensor (exit 2) detects whether media is remaining in the exit 2. Sensor (Standard bin full exit 2) The sensor (exit 2 standard bin full) detects whether the standard bin is full. Sensor (exit 2 media shift HP) The sensor (exit 2 media shift HP) detects the media exit roll assembly position.
General information1-73 7500-XXX Exit 2 transport roll assembly and media exit roll assembly The exit 2 transport roll assembly and exit 2 media exit roll assembly are rollers used to eject media to the exit 2 standard bin or to feed media to the duplex. Tools required for service Flat-blade screwdriver #1 Phillips screwdriver, magnetic #2 Phillips screwdriver, magnetic #2 Phillips screwdriver, magnetic short-blade Needle nose pliers Diagonal side cutters Spring hook Analog or digital multi meter Parallel wrap plug 1319128 Twinax/serial debug cable (#1381963) Coax/serial debug cable (#1381964) 5.5 mm hexdriver (magnetic) Rear Exit interface card asm Switch (exit 2 left door interlock) Exit 2 media exit roll asmSensor (standard bin full exit 2) Exit 2 media transport roll asm Exit 2 drive motor Media shift motorSensor (exit 2) Sensor (exit 2 media shift HP)
1-74MFP Service Manual 7500-XXX Acronyms 2TM 2 Tray Module AC Alternating Current ADF Automatic Document Feeder APS Automatic Paper Size ASIC Application Specific Integrated Circuit CRU Customer Replaceable Unit CSU Customer Setup CCW Counterclockwise CW Clockwise DC Direct Current DIMM Dual Inline Memory Module DRAM Dynamic Random Access Memory EDO Enhanced Data Out EP Electrophotographic Process EPROM Erasable Programmable Read-only Memory ESD Electrostatic Discharge FRU Field Replaceable Unit GB Gigabyte GFI Ground Fault Interrupter HCF High-Capacity Feeder HVPS High Voltage Power Supply LASER Light Amplification by Stimulated Emission of Radiation LCD Liquid Crystal Display LD Laser Diode LED Light-Emitting Diode LEF Long Edge Feed LVPS Low Voltage Power Supply MPF Multi-Purpose Feeder MS Microswitch NVM Nonvolatile Memory NVRAM Nonvolatile Random Access Memory OEM Original Equipment Manufacturer OPT Optical Sensor PC Photoconductor PEL Picture element POR Power-on Reset POST Power-on Self Test PPM Pages Per Minute PSC Parallel Synchronous Communications PSD Position Sensing Device PWM Pulse Width Modulation RFID Radio Frequency Identification RIP Raster Imaging Processor ROM Read only Memory RPM Revolutions Per Minute SDRAM Synchronous Dual Random Access Memory SEF Short Edge Feed SIMM Single Inline Memory Module SOS Start of scan SRAM Static Random Access Memory TTM Tandem Tray Module
General information1-75 7500-XXX TVOC Total Volatile Organic Compound UPR Used Parts Return VVolts V ac Volts alternating current V dc Volts direct current
Diagnostic information2-1 7500-XXX 2. Diagnostic information Start CAUTION: Unplug the power cord from the printer or electrical outlet before you connect or disconnect any cable or electronic board or assembly for personal safety and to prevent damage to the printer. Disconnect any connections between the printer and PC peripherals. CAUTION: The MFP weighs approximately 106 kg (233 lb) and requires at least four people to lift it safely. Make sure your fingers are not under the MFP when you lift or set it down. CAUTION: If the printer is kept on, never touch the conductive parts while it is not specifically required. The power switch and inlet of the low voltage power supply card (LVPS card) assembly is live even while the power supply is cut off. Never touch the live parts. Warning:When operating the driving units using the diagnostics or other tools, be sure to keep them covered unless otherwise specified. Warning:When operating the driving units using the diagnostics or other tools, never touch the driving units. When operating the driving units using diagnostics or other tools, be sure to follow the procedures in this manual. CAUTION: Be careful to avoid burns by safely handling hot parts. Warning:Servicers should wear a wrist band or the like to remove static electricity from their body, grounding their body while working. Go to “Handling ESD-sensitive parts” on page 4-1. Using service checks To determine the corrective action necessary to repair a printer, look for the following information: •Verify the installation status. Go to “Confirm the installation status” on page 2-2. •Does POR (Power-on Reset) stop? Check the POR sequence. Go to “Power-on Reset sequence” on page 2-2. •If you get an error code message, go to “Error code messages” on page 2-13. —For detailed information on specific error codes and error messages, go to “Service checks” on page 2-40. •If you have an attendance message, refer to the User’s Guide. •For additional operator panel information, go to “Control panel” on page 2-3. Note: There may be printer error messages that are not contained in this service manual. Call your next level of support for assistance.
2-2MFP Service Manual 7500-XXX Confirm the installation status Be sure to check the following items before starting the troubleshooting procedures. •With the power cord unplugged from the wall outlet, check that the cord is free from breakage, short-circuit, disconnected wire, or incorrect connection in the power cord. •The printer is properly grounded. Check the power cord ground terminal. •The printer is not installed at a place subjected to extreme temperature, extreme humidity or rapid changes in temperature. •The printer is not installed close to water service, humidifier, heat generating unit, fire, in a very dusty place, or a place exposed to air flow from the air conditioning system. •The printer is not installed in a place where volatile gas or inflammable gas is generated. •The printer is not installed in direct sun. •The printer is installed on a level and stable surface. •Media meets specifications and is installed properly. •Customer maintenance parts have been replaced at the specified intervals. •Check all attached options for proper attachment and electrical connection. •Refer to the User’s Guide for proper installation. Power-on Reset sequence The following is an example of the events that occur during the POR sequence: 1.Turn the machine on. 2.The Lexmark splash screen appears with a progress bar in the center until the code is loaded. 3.The scanner exposure lamp flashes several times. 4.The fuser cooling fan turns on. 5.The fuser unit assembly lamps turn on. 6.The RIP card assembly cooling fan turns on. 7.Operator panel LED becomes solid. 8.The transport motor turns on. The following is an example of the screen that appears after the code is loaded. Copy E-Mail Fax FTP Menus Ready. Toner low. Touch any button to begin. Status/ Supplies