Basic Printer Functions, Printer Functional Block Diagram | HP 6L

Basic Printer Functions

This chapter presents a generalized functional overview of the printer and the printing processes. The following printer systems are discussed:

∙DC Controller System/ Power System

∙Formatter System

∙Image Formation System

∙Paper Feed System

∙Laser/Scanner System

Figure 5-1 is a generalized block diagram of the printer:

Figure 5-1

Printer Functional Block Diagram

5 Functional Overview

Functional Overview 5 - 3

Image 54

HP 6L, 5L manual Basic Printer Functions, Printer Functional Block Diagram

Contents

Page HP LaserJet 5L HP LaserJet 6L C3941A C3990A Warranty Conventions Here are required statements regarding RFI and laser safety Chapter Descriptions List of Figures Figure B-1 Vcci Statement Japan List of Tables Viii Contents Product Information Product Information Features Descriptions Printer FeaturesPrinter Features Paper Capacities and Sizes Identification Model and SerialHP LaserJet 5L Model and Serial Numbers HP LaserJet 6L Model and Serial Numbers Electrical Specifications SpecificationsPerformance Specifications Acoustic Emissions Product Overview Front/Side Views of the Printer Front Door Assemblies Back View of the Printer Ordering Parts Service ApproachParts Exchange Program Ordering Consumables Related Documentation Description Online Services for Technical Assistance Worldwide Support North American Response Center Warranty Warranty Exclusions Products sold within one country to another country Warranty LimitationsVoltage Conversions Regulatory requirements Product Information Site Requirements Site Requirements Operating Environment Consider the following points before installing the printerSite Requirements Environmental Requirements Printer Space Requirements Printer Dimensions Description DimensionPrinter Space Requirements HP C3906A/F Toner Cartridge Storage ConditionsStoring Opened Toner Cartridges Toner Cartridge Handling Suggestions Toner Cartridge Distribution Operating Overview Operating Overview Using the Control Panel Control Panel Layout LED Lights Indicator Lights 1When this Indicator It means this Do this Indicator Lights 2 Hardware Error There is an Front Panel Button Front Panel Button UsageFunction Lights Action Result Printing a Self-Test Self-test Page for HP LaserJet 5L To print a self-test Self-test Page for HP LaserJet 6L Continuous Self Test Printer’s rated speed Printing an Engine Test Useful for checking and adjusting registrationRefer to Engine Test in for the engine test procedure Engine Test Button Resetting the Printer To Reset the Printer Operating Overview Printer Maintenance Printer Maintenance Life Expectancy of Consumables Life Expectancy of Consumables Toner cartridge box Toner Cartridge LifeSaving Toner with EconoMode Five Percent Text Coverage Recycling Toner Cartridges Some software applications may refer to this as draft modeRefilled Toner Cartridges Information Cleaning the Printer Cleaning Printer Components Contaminants on the roller can cause print quality problemsCleaning Printer Components Cleaning Spilled Toner Stains into fabric Functional Overview Functional Overview Printer Functional Block Diagram Basic Printer Functions DC Controller/Power System DC Controller Loads Print Engine Control System Laser and Scanner Drive Power System on DC Controller PCA T e Functional Overview Resolution Enhancement REt Control Panel EconoMode vs Normal Mode EconoModeMemory Enhancement technology MEt Functional Overview 5 Image Formation Block Diagram Image Formation System Drum Conditioning Drum CleaningToner Cartridge Image Writing Image Fusing Image DevelopingImage Transferring Paper Feed System Simplified Paper Path Solenoid and Sensors Solenoid and Photosensors Name Description Paper Jam Detection Printer Timing Refer to Timing Diagram on the nextBasic Sequence of Operation Period Timing Purpose General Timing Diagram HP LaserJet 5L General Timing Diagram HP LaserJet 6L Functional Overview Removal and Replacement Removal and Replacement Removal and Replacement Strategy Removal and Replacement Installing Memory Cards Dram MByte card MByte total Back Cover Ease of replacementCovers and Doors Remove the 3 screws -2, callout Make certain the Input Extender is up Back Cover Removal 2 EP Door Assembly EP Door Assembly Removal Memory Door Memory Door Removal Remove the toner cartridge Remove memory door Main Cover and Paper Input AssemblyMain Cover and Paper Input Assembly Removal Without removing the memory door Internal Assemblies Control Panel Removal Exit Roller Assembly Exit Roller Removal Delivery Assembly Delivery Assembly Removal 1 Delivery Assembly Removal 2 Fuser Pressure Plate Fuser Pressure Plate Removal Fuser Pressure Plate Replacement Heating Element Heating Element Removal 1 Heating Element Removal 2 Make sure the connectors are properly reattached Lift the Heating Element outHeating Element Removal 3 Pressure Roller On the right side of the shaft. Refer to for a part numberPressure Roller Guide Removal Unchanged. -17 shows the lever from an HP LaserJet 5L Face-Up/Face-Down Lever ReplacementFace-Up/Face-Down Lever Release mechanism Fuser Exit Roller Assembly Shows the white tab from an HP LaserJet 5LFuser Exit Roller Removal Reinstalled to exactly this position Paper Exit Sensor Flag ReplacementPaper Exit Sensor Flag Laser/Scanner Assembly Laser/Scanner Assembly RemovalTop Assemblies Solenoid Solenoid Removal 1 Only one way Solenoid Removal 2 Pickup Roller Assembly Pickup Roller Assembly Removal 1 Pickup Roller Assembly Removal 2 Assembly Figure Paper Pickup Roller Assembly Replacement Inside/Front View Paper Feed Frame Paper Feed Frame Removal 1 Paper Feed Frame Removal 2 Paper Feed Frame Removal 3 Release the sensor unit connector Figure Paper Feed Frame Removal 4 Transfer Roller Guide & Transfer Roller Kick Plate Kick Plate Removal Kick Plate Spring Replacement Separation Pad Separation Pad Removal Place your index finger on the subpad SubpadsAt the same time Press toward the top of the printer Feed Assembly Feed Assembly Removal 1 Remove the Feed Assembly Feed Assembly Removal 2 Feed Assembly Removal 3 Bottom Assemblies Memory Door GuideMemory Door Guide Removal Motor Motor Removal DC Controller DC Controller Removal 1 ESD Sensitive DC Controller Removal 2 DC Controller Removal 3 Formatter PCA Correct pieces should you need to replace themFormatter Board Removal Removal and Replacement Troubleshooting Troubleshooting General Troubleshooting Flowchart Start Exit Paper Path and Components Paper Path and Components DC Controller Diagram ∙ Status Messages ∙ Service and Error Messages Printer Error TroubleshootingPriority of Errors Persists Printer Status Messages Printer Status Messages 1LEDs Description Recommended Action Happens, troubleshoot using -3 below Unclearable ErrorPrinter Status Messages 2 Service and Error Messages Service and Error Messages 1 Beam Error. There are a number of causes Service and Error Messages 3 Formatter Error Image Formation Troubleshooting Check the Toner CartridgeOz grams Image Defect Examples ∙ Replace the DC Controller Vertical Lines Character Voids ∙ Your paper may not meet the requirements for the printer Dropouts ∙ Replace the DC Controller Troubleshooting Is completely blank. If you get occasional blank pages White Horizontal Line Distorted Image or BD Failure Troubleshooting Checks Engine TestEngine Test Troubleshooting Drum Rotation Functional Check Toner Cartridge High Voltage Connection Points 1 High-Voltage Power Supply CheckHigh-Voltage Power Supply Check Checks Action Toner Cartridge High Voltage Connection Points 2 Paper Curl Troubleshooting Paper CurlPossible Cause Recommended Action Remove the Printer Covers Figures 6-2, 6-3, Troubleshooting ToolsPaper Path Check Overriding PS204 and SW101 Repetitive Image Defect Ruler Repetitive Image Defect Ruler Main Wiring Diagram Troubleshooting Connector Signal Name Remarks Cable Pinouts Frsth Troubleshooting Parts and Diagrams Parts and Diagrams How to Use the Part Lists and Diagrams Parts and cannot be ordered through SMO Accessories and Supplies Accessories and SuppliesProduct Number Description Common Hardware Example Description Major Assembly Locations Covers and Doors Qty Description Internal Components 1 LaserJet 5L Part No Internal Components 2 LaserJet 5LPart No Internal Components 3 Parts and Diagrams DC Controller/Formatter and Cables DC Controller Case Pickup Roller Assembly Parts and Diagrams Feed Assembly Parts and Diagrams Separation Guide Assembly Parts and Diagrams Delivery Assembly Parts and Diagrams Parts and Diagrams Parts Index Parts Index A-1 Alphabetical Parts List Parts IndexParts Index Parts Index A-3 Index Parts Index Parts Index A-5 501/502 Parts Index A-7 Numerical Parts Index Numerical Parts List Parts Index A-9 Parts Index Parts Index A-11 Parts Index Laser Safety U.S.A Regulatory Information Laser Statement Finland Regulatory Information Toner Safety Ozone EmissionRegulatory Information B-3 FCC Statement Class B Figure B-1 Service Notes C-1 Fuser Accordian JamsC3941A-01 Service Notes Solution Service Notes C-3 Fuser Jam Clearing CountermeasureC3941A-02A Service Notes Index Index-1 Index-2 Safety Index-3 Index-4 C3990-90991