Euro Kitchen Appliances PS101-36 Service Manual

HP LaserJet 4000 and 4050 Series Printers Service ManualHP LaserJet 4000 and4050 Series PrintersService ManualPrinted on at least50% Total Recycled Fi

Contents-6

5-4 Functional InformationHigh-voltage Power DistributionFigure 5-2 Engine Controller BoardIn response to the instructions from the microprocessor (CP

Power Supply System 5-5 Toner Cartridge DetectionThe Toner Cartridge has a Toner sensor. The circuit compares the output value of the developing AC bi

5-6 Functional InformationEngine Controller SystemThe following systems and functions are controlled by the engine controller board:●DC power distribu

Engine Controller System 5-7 Figure 5-3 Engine Controller Board

5-8 Functional InformationEngine Controller Board Inputs and OutputsFigure 5-4 Engine Controller Board I/O (1 of 4)

Engine Controller System 5-9 Figure 5-5 Engine Controller Board I/O (2 of 4)

5-10 Functional InformationFigure 5-6 Engine Controller Board I/O (3 of 4)

Engine Controller System 5-11 Figure 5-7 Engine Controller Board I/O (4 of 4)

5-12 Functional InformationLaser and Scanner DriveBased on information received from the Formatter, the Engine Controller Board sends signals to the L

Engine Controller System 5-13 MotorsSee “Timing Diagram” on page 5-50 for specific timing details for the printer motors.The Main Motor, MT1, is contr

Overview 1-11Printer DescriptionOverview This chapter discusses the following:●Printer Features●Identification●Site Requirements●Paper Specifications●

5-14 Functional InformationThe Scanner Motor is controlled and monitored by the Engine Controller Board. It rotates the Scanner Mirror during the init

Formatter System 5-15 Formatter SystemThe Formatter PCA is responsible for the following:●Controlling the PowerSave mode●Receiving and processing pri

5-16 Functional InformationNote Printer error messages override the PowerSave message. The printer will enter PowerSave mode at the appropriate time,

Formatter System 5-17 Input/OutputParallel InterfaceThe Formatter PCA receives incoming data through its Bidirectional Interface (IEEE 1284). The I/O

5-18 Functional InformationDiskThe disk accessory is mounted on the rear of the Formatter PCA. The optional greater than 1 GB EIO-based hard drive is

Formatter System 5-19 Random Access Memory (RAM)The RAM contains the page and I/O buffers and the font storage area. It stores printing and font infor

5-20 Functional InformationPage ProtectPage complexity (rules, complex graphics, or dense text) may exceed the printer’s ability to create the page im

Formatter System 5-21 PMLPML is a Printer Management Language that allows remote configuration and status readback through the I/O ports.Control Panel

5-22 Functional InformationImage Formation SystemThe image formation system is the main system in the printer. It consists of six stages:When the Form

Image Formation System 5-23 Figure 5-9 Image Formation SystemAfter the image has been transferred to the paper, it is then fused onto the paper by hea

1-2 Printer DescriptionPrinter FeaturesTable 1-1. Printer Features for the HP LaserJet 4000 Series PrinterSpeed 17 pages per minute (ppm)100 MHz RISC

5-24 Functional InformationToner CartridgeFigure 5-10 Toner CartridgeA major portion of the Image Formation System is contained in the Cartridge as sh

Image Formation System 5-25 Photosensitive DrumThe special properties of the Photosensitive Drum allow an image to be formed on the Drum surface and t

5-26 Functional InformationCleaning the DrumThe cleaning blade is in contact with the surface of the Drum at all times. As the Drum rotates during pri

Image Formation System 5-27 Conditioning the DrumAfter the Drum is cleaned, it must be conditioned. This process consists of applying a uniform negati

5-28 Functional InformationWriting the ImageDuring the writing process, a modulated Laser Diode projects the beam onto the rotating six-sided Scanning

Image Formation System 5-29 Developing the ImageThe developing process develops the latent electrostatic image into a visible image on the Drum. The D

5-30 Functional InformationTransferring the ImageDuring the transferring process the Toner image on the Drum surface is transferred to the paper. A po

Image Formation System 5-31 Image Fusing/Variable Fusing TemperatureDuring the fusing process, the Toner is fused into the paper by heat and pressure

5-32 Functional InformationVariable Fusing TemperatureFigure 5-18 Fusing Temperature ControlVariable fusing temperature is a feature that gives the us

Paper Feed System 5-33 Paper Feed SystemFigure 5-19 Paper Feed Subsystem

Printer Features 1-3 Paper Trays 100-sheet Tray 1●Size: 3 by 5 in to legal (76 by 127 mm to 216 by 356 mm)500-sheet Tray 2 (HP LaserJet 4000/ 4000 N)●

5-34 Functional InformationFigure 5-20 Paper PathThe presence of paper in Tray 1 is detected by the Tray 1 Paper Sensor (PS105). Presence of paper in

Paper Feed System 5-35 and by the six switches (SW600, 601, 602, 603, 604, 605) on the Paper Size Detection PCA for the HP LaserJet 4000 T, 4000 TN, 4

5-36 Functional InformationPrinting from Tray 1The presence of paper in Tray 1 is detected by the Tray 1 Paper Sensor (PS105).When the Engine Controll

Paper Feed System 5-37 Figure 5-22 Tray 1 Pickup

5-38 Functional InformationPrinting from Tray 2When the Formatter inputs the /PRNT signal to the printer, the Main Motor (M1) starts rotation. When th

Paper Feed System 5-39 Figure 5-24 Tray 2 Pickup

5-40 Functional InformationMulti-Feed Prevention MechanismWhen feeding paper from Tray 2, the printer uses the Separation Roller to prevent multi-feed

Paper Feed System 5-41 Printing from the Optional 500-sheet Universal TrayThe operation sequences of the Paper Feeder are controlled by the Paper Feed

5-42 Functional InformationPickup and FeedingThe Paper Feeder picks up the paper from the installed trays and feeds the paper to the printer. The flow

Paper Feed System 5-43 The CPU on the Engine Controller Board monitors the conditions of the PS102 for a prescribed period of time after the pickup st

1-4 Printer DescriptionTable 1-2. Printer Features for the HP LaserJet 4050 Series PrinterSpeed 17 pages per minute (ppm)133 MHz RISC microprocessorFi

5-44 Functional InformationEnvelope FeederThe operation sequences of the Envelope Feeder are controlled by the Envelope Feeder Driver. A 4-bit micropr

Paper Feed System 5-45 is completed, the Envelope Feeder Driver PCA receives the pickup command from the Engine Controller Board and turns on the enve

5-46 Functional InformationDuplexerThe operation sequences of the Duplexer are controlled by the Duplexer Driver. A 4-bit microprocessor is used in th

Paper Feed System 5-47 Figure 5-31 Paper Path for the Duplexer

5-48 Functional InformationFigure 5-32 Paper Feed for the DuplexerPaper JamThere are four photointerrupters (PS102, PS103, PS106, PS501) in the paper

Basic Sequence of Operation 5-49 Basic Sequence of OperationThe Formatter PCA and the Engine Controller Board share information during printer operati

5-50 Functional InformationFigure 5-33 Timing Diagram

Overview 6-1 6Removing and Replacing PartsOverviewThis chapter discusses the following:●Removal and Replacement Strategy●Removing Covers●Removing Asse

6-2 Removing and Replacing PartsRemoval and Replacement StrategyThis chapter describes the complete disassembly of the printer. In every instance, tas

Removal and Replacement Strategy 6-3 Tools●Phillips #2 magnetized screwdriver with 6-inch shaft●Flat-blade screwdriver with 6-inch shaft●Needle-nose p

Printer Features 1-5 Paper Trays 100-sheet Tray 1●Size: 3 by 5 to legal (76 by 127 mm to 216 by 356 mm)500-sheet Tray 2 (HP LaserJet 4050/ 4050 N)●Siz

6-4 Removing and Replacing PartsTable 6-1. Screws Used in the PrinterDrawing and Description PurposeThreaded Phillips with captive star washerUsed to

Removal and Replacement Strategy 6-5 Hint To insert self-tapping screws, turn the screw to the left (counter-clockwise) until it clicks, then turn it

6-6 Removing and Replacing PartsRemoving CoversIt is usually best to remove and replace the covers in the order shown. Turn the printer off and unplug

Removing Covers 6-7 Top CoverOpen the Top Cover and remove the Toner Cartridge.CAUTION To prevent damage to the Toner Cartridge, do not expose it to l

6-8 Removing and Replacing PartsControl PanelFigure 6-4 Removing the Control Panel1 Using a flat-blade screwdriver, pry each side of the Control Panel

Removing Covers 6-9 Toner Cartridge Drive ArmFigure 6-5 Removing the Toner Cartridge Drive Arm1 Remove the Toner Cartridge Drive Arm by using needle-n

6-10 Removing and Replacing PartsFigure 6-6 Removing the Top Cover2 Remove the four screws holding the Top Cover (two are behind the Rear Output Bin,

Removing Covers 6-11 Figure 6-7 Releasing tabs to lift the Top Cover3 Squeeze the right front side of the Top Cover to remove it. It may be necessary

6-12 Removing and Replacing PartsLeft Side CoverFigure 6-8 Removing the Left Side Cover1 Open Tray 1.2 Release the latch on the left side cover from t

Removing Covers 6-13 Front Right Side CoverFigure 6-9 Removing the Front Right Side Cover1 Release the latch at the top center of the cover.2 Lift the

1-6 Printer DescriptionTable 1-3. Comparison of HP LaserJet 4000 Series PrintersHP LaserJet 4000HP LaserJet 4000 THP LaserJet 4000 NHP LaserJet 4000 T

6-14 Removing and Replacing PartsRear Cover/Rear Output BinFigure 6-10 Removing the Rear Cover/Rear Output Bin1 Facing the rear of the printer, pinch

Removing Covers 6-15 Tray 1Figure 6-11 Removing Tray 1 from the Front Cover1 Open Tray 1.2 Push outward on the two slot hinges to release the pins on

6-16 Removing and Replacing PartsFigure 6-12 Removing the Tray 1 Sensor Arm Cover4 Firmly pull both sides of the Tray 1 Sensor Arm Cover toward you un

Removing Covers 6-17 Figure 6-13 Detail of the Tray 1 Sensor Arm CoverHint When you reinstall the Tray 1 Sensor Arm Cover be sure the Sensor Arms move

6-18 Removing and Replacing PartsRemoving AssembliesThe order in which you replace the following assemblies depends on the part needing to be replaced

Removing Assemblies 6-19 Figure 6-15 Loosening the captive screws in the Fuser Assembly3 Loosen the two captive screws on the Fuser Assembly.4 Pull th

6-20 Removing and Replacing PartsFormatter Cage AssemblyFigure 6-16 Removing the Formatter Cage Assembly1 Print a Configuration Page. The information

Removing Assemblies 6-21 Output AssemblyFigure 6-17 Removing the Output Assembly1 Remove the Top Cover (page 6-7). The Output Assembly is on the top,

6-22 Removing and Replacing Parts2 Facing the rear of the printer, release the 2 latches as follows:Figure 6-18 Left end of Output Assembly (brass arm

Removing Assemblies 6-23 Laser ScannerFigure 6-20 Removing the Laser Scanner1 Remove the Top Cover (page 6-7). The Laser Scanner is on the top of the

Printer Features 1-7 Table 1-4. Comparison of HP LaserJet 4050 Series PrintersHP LaserJet 4050HP LaserJet 4050 THP LaserJet 4050 NHP LaserJet 4050 TNE

6-24 Removing and Replacing PartsFanFigure 6-21 Removing the Fan1 Remove the Top Cover (page 6-7) and the Left Side Cover (page 6-12). The Fan is on t

Removing Assemblies 6-25 Main MotorFigure 6-22 Removing the Main Motor1 Remove the Top Cover (page 6-7) and the Front Right Side Cover (page 6-13). Th

6-26 Removing and Replacing PartsTransfer RollerFigure 6-23 Removing the Transfer Roller1 Open the Top Cover and remove the Toner Cartridge. The Trans

Removing Assemblies 6-27 Tray 1 Pickup RollerFigure 6-24 Removing the Pickup Roller (shown with Envelope Entrance Cover removed)1 Open Tray 1. The Tra

6-28 Removing and Replacing PartsFigure 6-25 Detail of the Tray 1 Pickup Roller

Removing Assemblies 6-29 Tray 1 Pickup Assembly1 Remove the covers (starting on page 6-6): Top Cover, Left Side Cover, Front Right Side Cover, and Tra

6-30 Removing and Replacing PartsFigure 6-27 Removing the Tray 1 Pickup Assembly – Right Side5 Disconnect the solenoid cable on the right side of the

Removing Assemblies 6-31 Figure 6-28 Removing the Tray 1 Pickup Assembly – Left Side6 Unplug the connector to the Engine Controller Board on the left

6-32 Removing and Replacing PartsFigure 6-29 Removing the Tray 1 Pickup Assembly – Front Side9 Remove the 3 screws shown.10 Lift the black Toner Cartr

Removing Assemblies 6-33 Right Side Toner Cartridge GuideYou can lift aside the Right Side Toner Cartridge Guide (instead of removing it) to access th

1-8 Printer DescriptionIdentificationModel and Serial NumbersThe model number and printer serial number are listed on an identification label located

6-34 Removing and Replacing PartsRegistration AssemblyFigure 6-31 Removing the Registration Assembly1 Remove the following covers (starting on page 6-

Removing Assemblies 6-35 Figure 6-32 Detail of screws for the Registration AssemblyCAUTION Do not remove the silver screw closest to the Registration

6-36 Removing and Replacing PartsPaper Feed Assembly1 Remove the following covers (starting on page 6-6): Top Cover, Left Side Cover, Front Right Side

Removing Assemblies 6-37 Figure 6-34 Removing the upper screws from the Paper Feed Assembly3 Remove the 2 black upper screws.Hint After replacing the

6-38 Removing and Replacing PartsHint For replacement of the Paper Feed Assembly, orient the clutch properly by inserting it into the slot, as shown.F

Removing Assemblies 6-39 Formatter PanFigure 6-36 Removing the Formatter Pan1 Remove the Top Cover (page 6-7) and the Front Right Side Cover (page 6-1

6-40 Removing and Replacing PartsGear TrainFigure 6-37 Removing the Gear Train1 Remove the following covers (starting on page 6-6): Top Cover, Front R

Removing Assemblies 6-41 Delivery Drive AssemblyFigure 6-38 Removing the Delivery Drive Assembly1 Remove the covers (starting on page 6-6): Top Cover,

6-42 Removing and Replacing PartsSeparating the Engine Module from the Paper Feed ModuleThis procedure is the same for printers with a single 500-shee

Separating the Engine Module from the Paper Feed Module 6-43 Figure 6-40 Separating the Engine from the Paper Feed Module3 Remove the single black, se

Site Requirements 1-9 Site RequirementsThe following environmental specifications must be maintained to ensure the proper operation of the printer. Co

6-44 Removing and Replacing PartsEngine Controller BoardNote After you replace the Engine Controller Board, do not forget to readjust the top margin a

Separating the Engine Module from the Paper Feed Module 6-45 Facing the front of the Engine Module:3 Remove 7 screws (shown in Figure 6-41 on page 6-4

6-46 Removing and Replacing PartsAdjusting the Top MarginWhen you replace the Engine Controller Board, you must readjust the top margin as follows:Fig

Separating the Engine Module from the Paper Feed Module 6-47 Figure 6-44 Adjusting the top margin2 Measure the distance between the edge of the paper

6-48 Removing and Replacing PartsPaper Feed RollersThe following procedure is the same for all HP LaserJet 4000 and 4050 series printers; there are 2

Separating the Engine Module from the Paper Feed Module 6-49 Separation RollersFigure 6-46 Removing the Separation RollersThe Separation Rollers are i

6-50 Removing and Replacing PartsPaper Feed Module PlateRemove the Paper Feed Module Plate to access the Controller PCA. This procedure is the same fo

Separating the Engine Module from the Paper Feed Module 6-51 Paper Feed Module Gear Train AssemblyThis procedure is the same for one 500-sheet Tray or

6-52 Removing and Replacing PartsPaper Feed Module Side RailsRemove the Paper Feed Module side rails to access the PCA Controller. This procedure is t

Separating the Engine Module from the Paper Feed Module 6-53 Lower Paper Feed Module Plate (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN)Figure 6-50

1-10 Printer DescriptionSpace RequirementsFigure 1-2 Printer DimensionsPrinter Weight (without Toner Cartridge)●HP LaserJet 4000/4000 N and 4050/4050

6-54 Removing and Replacing PartsPCA Cover (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN)Figure 6-51 Removing the PCA Cover (HP LaserJet 4000 T/4000

Separating the Engine Module from the Paper Feed Module 6-55 PCA Cover (HP LaserJet 4000/4000 N and 4050/4050 N)Figure 6-52 Removing the PCA Cover (HP

6-56 Removing and Replacing PartsPCA ControllerThis procedure is the same for one 500-sheet Tray or two 250-sheet Trays.Figure 6-53 Removing the PCA C

Overview 7-1 7TroubleshootingOverviewThis chapter discusses the following:●Troubleshooting Process●Troubleshooting the Printing System●Reference Diagr

7-2 TroubleshootingTroubleshooting ProcessThe troubleshooting process is a systematic approach that addresses the major problems first, and then other

Troubleshooting Process 7-3 General Paper Path Troubleshooting(page 7-45)Is there a paper jam in the printer?This section gives information about solv

7-4 TroubleshootingTroubleshooting FlowchartFigure 7-1 Troubleshooting Flowchart (1 of 2)

Troubleshooting Process 7-5 Troubleshooting Flowchart (Continued)Troubleshooting Flowchart, continued

7-6 TroubleshootingTroubleshooting the Printing SystemPreliminary Operating ChecksPrior to troubleshooting a specific printer problem, you should ensu

Troubleshooting the Printing System 7-7 Power OnNote It is important to have the printer’s Control Panel functional as soon as possible in the trouble

Site Requirements 1-11 Environmental Requirements Table 1-6. Printer and Toner Cartridge Environmental ConditionsItem Operating StorageTemperature 50-

7-8 TroubleshootingNote The Fan only operates during initial power on and while printing, unless the temperature inside the printer is too high. If th

Troubleshooting the Printing System 7-9 Table 7-3. No AC PowerCause ActionNo correct voltage present at the outlet. Plug the power cord into another A

7-10 TroubleshootingTable 7-4. No DC PowerCause ActionNo AC power is supplied. Check the AC power supply. See Table 7-3, “No AC Power,” on page 7-9The

Troubleshooting the Printing System 7-11 Engine TestThe printer has one test pattern (vertical lines). When an image defect appears, a test print can

7-12 TroubleshootingFigure 7-2 Location of the Engine Test ButtonPrinting an Engine Test To print an engine test, use a non-metallic object (such as a

Troubleshooting the Printing System 7-13 Event LogUse the Event Log to diagnose and troubleshoot printer errors and intermittent failures. You can eit

7-14 TroubleshootingFigure 7-3 Sample Event LogMost recent error (up to 30)

Troubleshooting the Printing System 7-15 Display the Event LogIf the printer cannot print or move any paper, follow these steps to display the Event L

7-16 TroubleshootingInterpret the Event LogThe Event Log is the key tool in troubleshooting printer problems. Figure 7-3 shows a typical Event Log. Th

Troubleshooting the Printing System 7-17 Printer MessagesThe following tables explain messages that might display on the printer’s Control Panel. Alph

1-12 Printer DescriptionPaper SpecificationsThe following tables show paper specifications for the HP LaserJet 4000 and 4050 series printer.* The prin

7-18 TroubleshootingTable 7-5. Alphabetical Printer MessagesControl Panel MessageEvent Log MessageExplanation Recommended ActionACCESS DENIEDMENUS LOC

Troubleshooting the Printing System 7-19 CHOSEN LANGUAGE NOT AVAILABLEA print job requested a printer language that does not exist in the printer. The

7-20 TroubleshootingDISK IS WRITE PROTECTEDThe EIO disk is protected, and no new files can be written to it.Disable the write protection through HP Je

Troubleshooting the Printing System 7-21 ENV FEEDER LOAD[TYPE] [SIZE]There is no envelope in the feeder, the wrong size is loaded in the feeder, or th

7-22 TroubleshootingFLASH IS WRITE PROTECTEDThe flash DIMM is protected, and no new files can be written to it.Disable the write protection through HP

Troubleshooting the Printing System 7-23 LOADINGPROGRAM <NUMBER>alternates withDO NOT POWER OFFPrograms and fonts can be stored on the printer’s

7-24 TroubleshootingMEMORY SETTINGS CHANGEDThe printer changed its memory settings because it did not have enough memory to use the previous settings

Troubleshooting the Printing System 7-25 RAM DISK DEVICEFAILUREThe RAM disk had a critical failure and can no longer be used. 1. Turn the printer off,

7-26 TroubleshootingTRAY X EMPTYThe specified tray is empty, but the current job does not need this tray in order to print correctly.If this message a

Troubleshooting the Printing System 7-27 TRAY X LOAD [TYPE] [SIZE]One of the following occurred:There is no paper loaded in the specified tray, or the

Paper Specifications 1-13 * The printer supports a wide range of paper sizes. Check the printer software for supported sizes. ** Capacity may vary dep

7-28 TroubleshootingUNABLE TOMOPY JOBMemory or file system failures would not allow a mopy job to occur. Only one copy will be produced.UNSUPPORTED SI

Troubleshooting the Printing System 7-29 Table 7-6. Numerical Printer MessagesControl Panel MessageEvent Log MessageExplanation Recommended Action13.X

7-30 Troubleshooting13.5 PAPER JAM13.5 Paper delay jam at Fuser. For 13.5 and 13.6:1. Check the Transfer Roller and Small Media Belt to ensure they ar

Troubleshooting the Printing System 7-31 20 INSUFFICIENT MEMORYalternates withPRESS GO TOCONTINUEThe printer received more data than can fit in its av

7-32 Troubleshooting22 PARALLEL I/OBUFFER OVERFLOWalternates withPRESS GO TOCONTINUEToo much data was sent to the parallel port.This error can occur i

Troubleshooting the Printing System 7-33 40 BAD SERIAL TRANSMISSIONalternates withPRESS GO TOCONTINUEThe printer encountered an error while transferri

7-34 Troubleshooting41.3 UNEXPECTED PAPER SIZEThe paper size you are trying to print is not the same as the settings for the tray.1. Make sure that al

Troubleshooting the Printing System 7-35 50.X FUSER ERRORA Fuser error has occurred.X Description:1 = Low Fuser temperature2 = Fuser warm up service3

7-36 Troubleshooting51.X PRINTER ERRORA loss of beam detect occurred.X Description:1 = Beam detect error2 = Laser error1. Press [Go]. The page contain

Troubleshooting the Printing System 7-37 53.XY.ZZ PRINTER ERRORThere is a memory error with an accessory. The DIMM that caused the error will not be u

1-14 Printer Description* The printer supports a wide range of paper sizes. Check the printer software for supported sizes.** Capacity may vary depend

7-38 Troubleshooting55 PRINTER ERRORalternates withPRESS GO TOCONTINUEAn internal communications error occurred.1. Press [Go]. The page containing the

Troubleshooting the Printing System 7-39 59.X PRINTER ERRORA printing error occurred.X Description:0 = Motor error1 = Motor startup error2 = Motor rot

7-40 Troubleshooting68 NVRAM ERROR CHECK SETTINGSAn error occurred in the printer’s nonvolatile memory (NVRAM) and one or more printer settings has be

Troubleshooting the Printing System 7-41 79.XXXXPRINTER ERRORThe printer detected an error. The numbers (XXXX) indicate the specific type of error. 1.

7-42 Troubleshooting8X.YYYYThe EIO accessory in slot X has encountered a critical error as specified by YYYY.X Description:1 = EIO slot 1 – The printe

Troubleshooting the Printing System 7-43 The following table lists the disk error numbers reported on either the Printer Collation or Job Storage Disk

7-44 Troubleshooting59 The maximum number of directories has been reachedThere is a maximum number of directories that can be put on a disk. Stored jo

Troubleshooting the Printing System 7-45 General Paper Path TroubleshootingPaper jams occur in the printer when paper does not either reach or clear a

7-46 TroubleshootingThere are four photosensors (PS102, PS103, PS106, PS501) in the paper path for detecting arrival or passing of the paper.If the pa

Troubleshooting the Printing System 7-47 Paper Path TestTo perform a Paper Path Test:1 Press [Menu] until INFORMATION MENU appears.2 Press [Item] unti

Paper Specifications 1-15 * The printer supports a wide range of paper sizes. Check the printer software for supported sizes.** Capacity may vary depe

7-48 TroubleshootingInformation PagesFrom the printer’s Control Panel you can print pages that give details about the printer and its current configur

Troubleshooting the Printing System 7-49 Figure 7-5 Sample Menu Map (4000 series printer)

7-50 TroubleshootingFigure 7-6 Sample Menu Map (4050 series printer)

Troubleshooting the Printing System 7-51 Configuration PageUse the Configuration Page to view current printer settings, to help troubleshoot printer p

7-52 TroubleshootingFigure 7-7 Sample Configuration Page (4000 series printer)Printer InformationLists the serial number, HP JetSend IP addresses, pag

Troubleshooting the Printing System 7-53 Figure 7-8 Sample Configuration Page (4050 series printer)Printer InformationLists the serial number, HP JetS

7-54 TroubleshootingVerify Installed OptionsUnder “Installed Personality” on the Configuration Page, look for options such as hard disk or DIMM types

Troubleshooting the Printing System 7-55 Check the Toner CartridgeImage formation defects are often the result of problems with the Toner Cartridge. I

7-56 TroubleshootingNote Toner Cartridges are rated for 6,000 or 10,000 images at 5% coverage (depending on the model). It is possible to wear out the

Troubleshooting the Printing System 7-57 Image DefectsThe quality of the printer’s output is subject to the judgment of the user. This section of the

1-16 Printer DescriptionGuidelines for Using PaperFor best results, use conventional 20 lb (75 g/m2) paper. Make sure the paper is of good quality and

7-58 TroubleshootingHint If you find a defect that is not depicted, record the probable cause along with the conditions in the printing environment an

Troubleshooting the Printing System 7-59 Table 7-12. Blank PagePossible Cause ActionNo Toner is available for print.Remove sealing tape or replace the

7-60 TroubleshootingTable 7-13. Blank SpotsPossible Cause ActionPaper does not meet printer specifications or is stored improperly.1. Print a few more

Troubleshooting the Printing System 7-61 Table 7-14. CreasesPossible Cause ActionPaper does not meet printer specifications or is stored improperly.1.

7-62 TroubleshootingTable 7-15. CurlPossible Cause ActionPaper does not meet printer specifications or is stored improperly.1. Print a few more pages

Troubleshooting the Printing System 7-63 Table 7-16. Contamination on BackPossible Cause ActionContamination inside printer (Tray Separation Roller, F

7-64 TroubleshootingTable 7-17. Distorted ImagePossible Cause ActionPaper does not meet printer specifications or is stored improperly.1. Print a few

Troubleshooting the Printing System 7-65 Table 7-18. DropoutsPossible Cause ActionPaper might be too smooth.Check the paper (or other print media) typ

7-66 TroubleshootingTable 7-20. Gray BackgroundPossible Cause ActionPaper does not meet printer specifications or is stored improperly.1. Print a few

Troubleshooting the Printing System 7-67 Table 7-21. Horizontal Black LinesPossible Cause ActionDefective Laser Scanner Assembly or Engine Controller

Paper Specifications 1-17 Note Do not use letterhead paper that is printed with low-temperature inks, such as those used in some types of thermography

7-68 TroubleshootingTable 7-24. Light Print, Dark Print, or FadePossible Cause ActionWrong Toner density setting.From the print quality menu on the Co

Troubleshooting the Printing System 7-69 Table 7-25. Loose TonerPossible Cause ActionContamination in the printer.1. Print a few more pages to see if

7-70 TroubleshootingTable 7-27. SkewPossible Cause ActionPaper does not meet printer specifications or is stored improperly.1. Print a few more pages

Troubleshooting the Printing System 7-71 Table 7-29. Toner SpecksPossible Cause ActionContamination in printer.1. Print a few more pages to see if the

7-72 TroubleshootingTable 7-31. Vertical DotsPossible Cause ActionContaminated Static Eliminator teeth.Clean the Static Eliminator.Poor contact betwee

Troubleshooting the Printing System 7-73 Repetitive Defect RulerRepetitive print defects are usually associated with a specific roller within the prin

7-74 TroubleshootingImage System TroubleshootingHalf Self Test Functional CheckThe electrophotographic process can be subdivided into the following st

Troubleshooting the Printing System 7-75 Drum Rotation Functional CheckThe Photosensitive Drum, located in the Toner Cartridge, must rotate for the pr

7-76 TroubleshootingHigh-voltage Power Supply Functional CheckThe High-voltage Power Supply Assembly provides the necessary voltages for the printer’s

Troubleshooting the Printing System 7-77 Interface TroubleshootingThis section provides an overview of the printer’s interface requirements.Communicat

1-18 Printer DescriptionPaper Weight Equivalence TableUse this table to determine approximate equivalent points in weight specifications other than U.

7-78 TroubleshootingFigure 7-10 Sample JetDirect Configuration Page (4000 series printer)Network statisticsI/O card statusIP addressNode nameNovell st

Troubleshooting the Printing System 7-79 Sample JetDirect Configuration Page (4050 series printer)

7-80 TroubleshootingHP JetDirect Configuration●If the HP EIO JetDirect Card has successfully powered up and completed its internal diagnostics, the I/

Troubleshooting the Printing System 7-81 AUTOEXEC.BAT Standard ConfigurationsParallel DOS CommandsIf the previous check did not produce the desired re

7-82 TroubleshootingCommunications ChecksTable 7-34. Communications ChecksChecks ActionIs your computer configured to the parameters described in the

Troubleshooting the Printing System 7-83 If the host system and printer still are not communicating and you have addressed the issues in Table 7-34, r

7-84 TroubleshootingReference DiagramsLocations of ComponentsFigure 7-11 Components of the Paper Pickup and Feed System (HP LaserJet 4000/4000 N and 4

Reference Diagrams 7-85 Table 7-35. Components in Figure 7-11PS101 Tray 2 Paper Out SensorPS102 Pre-Feed SensorPS103 Top of Page SensorPS104 Top Outpu

7-86 TroubleshootingFigure 7-12 Components of the Paper Feed System (HP LaserJet 4000/4000 N and 4050/4050 N with Optional 500-sheet Universal Tray As

Reference Diagrams 7-87 Figure 7-13 Components of the Duplexer

Paper Specifications 1-19 LabelsCAUTION To avoid damaging the printer, use only labels recommended for use in laser printers.If you have problems prin

7-88 TroubleshootingFigure 7-14 Components of the Fusing and Delivery Unit

Reference Diagrams 7-89 Figure 7-15 Components of the Envelope Feeder

7-90 TroubleshootingPaper PathFigure 7-16 Paper Path (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN Shown)Figure 7-17 Paper Path with the Duplexer

Reference Diagrams 7-91 Figure 7-18 Paper Path with the Envelope Feeder

7-92 TroubleshootingFigure 7-19 Paper Sensors and the Paper PathTable 7-36. Paper Sensors in Figure 7-19PS102 Pre-Feed Sensor Sensor and flag located

Reference Diagrams 7-93 Engine Controller BoardFigure 7-20 Engine Controller Board LayoutTable 7-37. Engine Controller Board LayoutSW1 Power switchSW5

7-94 TroubleshootingPaper Size Detection SwitchesFigure 7-21 Paper Size Detection Switches (1 of 3), Tray 2 (HP LaserJet 4000/4000 N and 4050/4050 N)F

Reference Diagrams 7-95 Figure 7-23 Paper Size Detection Switches (3 of 3), Optional 500-sheet Universal Tray AssemblyTable 7-38. Paper Size Detection

7-96 TroubleshootingMotorsFigure 7-24 Location of MotorsTable 7-39. Motors in Figure 7-24M101 Main MotorM701 Reversing Motor (Duplexer)M702 Duplex Fee

Reference Diagrams 7-97 ConnectorsFigure 7-25 Connectors (1 of 3)

HP LaserJet 4000 and 4050 Series PrintersService Manual _____________

1-20 Printer DescriptionEnvelopesEnvelope ConstructionEnvelope construction is critical. Envelope fold lines can vary considerably, not only between m

7-98 TroubleshootingFigure 7-26 Connectors (2 of 3)

Reference Diagrams 7-99 Figure 7-27 Connectors (3 of 3)For locations of connectors see the wiring diagrams at the back of this manual.

7-100 TroubleshootingPCAsFigure 7-28 Location of PCAs

Reference Diagrams 7-101 Table 7-40. Location of PCAs1 Engine Controller Board Sequence control, High-voltage output, DC output, and Heater Drive.2 Pa

7-102 TroubleshootingSensors and ThermistorFigure 7-29 Location of Sensors and Thermistor (1 of 2)

Reference Diagrams 7-103 Figure 7-30 Location of Sensors and Thermistor (2 of 2)Table 7-41. Sensors and Thermistor in Figure 7-29 and Figure 7-30PS101

7-104 TroubleshootingPS703 Reversed Paper Sensor (Duplexer)PS801 Paper Feeder Paper Sensor (Paper Feeder)PS901 Envelope Sensor (Envelope Feeder)PS902

Reference Diagrams 7-105 Solenoids and ClutchFigure 7-31 Location of Solenoids and Clutch (1 of 2)

7-106 TroubleshootingFigure 7-32 Location of Solenoids and Clutch (2 of 2)

Reference Diagrams 7-107 Table 7-42. Solenoids and Clutch in Figure 7-31 and Figure 7-32CL102 Feed Roller ClutchSL101 Tray 2 Pickup SolenoidSL102 Tray

Paper Specifications 1-21 Envelopes with Double Side SeamsSome envelopes have vertical seams at both ends of the envelope, rather than diagonal seams.

7-108 TroubleshootingSwitchesFigure 7-33 Location of Switches

Reference Diagrams 7-109 Table 7-43. Switches in Figure 7-33SW101 Door open detection switchSW600 Tray 2 Paper size switchSW601 Tray 2 Paper size swit

7-110 TroubleshootingTimingFigure 7-34 Pickup Timing for Tray 2 (and lower trays)Figure 7-35 Pickup Timing for Tray 1

Overview 8-1 8Parts and DiagramsOverviewThis chapter discusses the following:●How To Use the Parts Lists and Diagrams●Accessories and Supplies●Illustr

8-2 Parts and DiagramsHow To Use the Parts Lists and DiagramsThe figures in this chapter illustrate the major subassemblies in the printer and their c

How To Use the Parts Lists and Diagrams 8-3 Note Parts that have no item number or part number listed are not field replacement parts and cannot be or

8-4 Parts and DiagramsAccessories and SuppliesThe following items are available through your local authorized HP dealer. To find a dealer near you, ca

Accessories and Supplies 8-5 * The maintenance kits can be ordered from Support Materials Organization(U.S.) or Support Materials Europe. See page 8-2

8-6 Parts and DiagramsCommon Screws and Replacement CablesTable 8-2. Screws Used in the PrinterDescription Part No.Screw, M4x10, self-tapping (black)

Accessories and Supplies 8-7 Table 8-3. Replaceable CablesDescription Part No. Table No. Item No.Cable and Power Receptacle RG5-3696-000CN Table 8-7 o

1-22 Printer DescriptionEnvelope MarginsThe following table gives typical address margins for a Commercial #10 or DL envelope.Note For the best print

8-8 Parts and DiagramsIllustrations and Parts ListsFigure 8-1 Assembly Location DiagramEngine Controller Board AssemblyTray 1 Pickup AssemblyTop Cover

Illustrations and Parts Lists 8-9 Table 8-4. Assemblies (Listed Alphabetically) and Their Part NumbersDescription Part No. Exchange No. Exploded View

8-10 Parts and DiagramsFigure 8-2 External Covers and Panels981346257

Illustrations and Parts Lists 8-11 Table 8-5. External Covers and PanelsItem No. Part No. Quantity Description1 RB1-8858-000CN 1 Panel, Formatter Cove

8-12 Parts and DiagramsFigure 8-3 Top Cover Assembly23415

Illustrations and Parts Lists 8-13 Table 8-6. Top Cover AssemblyItem No. Part No. Quantity Description1 RG5-2663-000CN 1 Top Cover Assembly2 RB1-8841-

8-14 Parts and DiagramsFigure 8-4 Internal Components (1 of 3)13127312456910111415816182021221719

Illustrations and Parts Lists 8-15 Table 8-7. Internal Components (1 of 3)Item No. Part No. Quantity Description1 RB1-8862-000CN 1 Guide, Formatter/CP

8-16 Parts and DiagramsFigure 8-5 Internal Components (2 of 3)1234569101112141516181917713208212223

Illustrations and Parts Lists 8-17 Table 8-8. Internal Components (2 of 3)Item No. Part No. Quantity Description1 RB2-2405-000CN 1 Plate, Control Pane

Paper Specifications 1-23 Card Stock and Heavy PaperMany types of card stock can be printed from Tray 1, including index cards and postcards. Some typ

8-18 Parts and Diagrams23 C4118-40002C4118-40007C4118-40020C4118-40008C4118-40009C4118-40010C4118-40011C4118-40012C4118-40013C4118-40015C4118-40017C41

Illustrations and Parts Lists 8-19 Notes:

8-20 Parts and DiagramsFigure 8-6 Internal Components (3 of 3)51234

Illustrations and Parts Lists 8-21 Table 8-9. Internal Components (3 of 3)Item No. Part No. Quantity Description1 RF5-1867-000CN 1 Pre-Transfer Ground

8-22 Parts and DiagramsFigure 8-7 Engine Controller Board Assembly1

Illustrations and Parts Lists 8-23 Table 8-10. Engine Controller Board AssemblyItem No. Part No. Exchange No. Quantity Description1 RG5-3693-000CN C41

8-24 Parts and DiagramsFigure 8-8 Delivery Drive Assembly12Table 8-11. Delivery Drive AssemblyItem No. Part No. Quantity Description1 RG5-3721-000CN 1

Illustrations and Parts Lists 8-25 Figure 8-9 Printer Drive Assembly213Table 8-12. Printer Drive AssemblyItem No. Part No. Quantity Description1 RG5-2

8-26 Parts and DiagramsFigure 8-10 Tray 1 Pickup Assembly1456237

Illustrations and Parts Lists 8-27 Table 8-13. Tray 1 Pickup AssemblyItem No. Part No. Quantity Description1 RG5-2655-100CN 1 Tray 1 Pickup Assembly2

1-24 Printer DescriptionSafety InformationLaser Safety StatementThe Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Admini

8-28 Parts and DiagramsFigure 8-11 Tray 1 Assembly1Table 8-14. Tray 1 AssemblyItem No. Part No. Quantity Description1 RG5-2656-000CN 1 Tray 1 Assembly

Illustrations and Parts Lists 8-29 Figure 8-12 Paper Feed Assembly1Table 8-15. Paper Feed AssemblyItem No. Part No. Quantity Description1 RG5-2651-000

8-30 Parts and DiagramsFigure 8-13 Registration Assembly1Table 8-16. Registration AssemblyItem No. Part No. Quantity Description1 RG5-2652-070CN 1 Reg

Illustrations and Parts Lists 8-31 Figure 8-14 Paper Feed Guide AssemblyTable 8-17. Paper Feed Guide AssemblyItem No. Part No. Quantity Description1 R

8-32 Parts and DiagramsFigure 8-15 Delivery Assembly3412

Illustrations and Parts Lists 8-33 Table 8-18. Delivery AssemblyItem No. Part No. Quantity Description1 RG5-2648-000CN 1 Delivery Assembly2 RG5-2650-0

8-34 Parts and DiagramsFigure 8-16 Fuser Assembly (1 of 2)12Table 8-19. Fuser Assembly (1 of 2)Item No. Part No. Exchange No. Quantity Description1 RG

Illustrations and Parts Lists 8-35 Figure 8-17 Fuser Assembly (2 of 2)123Table 8-20. Fuser Assembly (2 of 2)Item No. Part No. Exchange No. Quantity De

8-36 Parts and DiagramsFigure 8-18 Internal Components of 500-Sheet Feeder1234567811109121314

Illustrations and Parts Lists 8-37 Table 8-21. Internal Components of 500-sheet FeederItem No. Part No. Quantity Description1 RB1-8890-000CN 1 Guide,

Safety Information 1-25 FCC RegulationsThis equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Pa

8-38 Parts and DiagramsFigure 8-19 Paper Pickup Drive Assembly12345678

Illustrations and Parts Lists 8-39 Table 8-22. Paper Pickup Drive AssemblyItem No. Part No. Quantity Description1 RG5-2672-000CN 1 Paper Pickup Drive

8-40 Parts and DiagramsFigure 8-20 500-sheet Tray 126345789111210

Illustrations and Parts Lists 8-41 Table 8-23. 500-sheet Tray Item No. Part No. Quantity Description1 RB1-8947-000CN 1 Panel, Roller Access 2 RF5-2489

8-42 Parts and DiagramsFigure 8-21 Internal Components of 250-sheet Module (1 of 2)1234567891011612133

Illustrations and Parts Lists 8-43 Table 8-24. Internal Components of 250-sheet Module (1 of 2)Item No. Part No. Quantity Description1 XA9-0870-000CN

8-44 Parts and DiagramsFigure 8-22 Internal Components of 250-sheet Feeder (2 of 2)12345A675B8

Illustrations and Parts Lists 8-45 Table 8-25. Internal Components of 250-sheet Feeder (2 of 2)Item No. Part No. Quantity Description1 RG5-2679-000CN

8-46 Parts and DiagramsFigure 8-23 Upper Paper Pickup Drive Assembly12Table 8-26. Upper Paper Pickup Drive AssemblyItem No. Part No. Quantity Descript

Illustrations and Parts Lists 8-47 Figure 8-24 Lower Paper Pickup Drive Assembly12Table 8-27. Lower Paper Pickup Drive AssemblyItem No. Part No. Quant

1-26 Printer DescriptionLaser Statement for FinlandLASERTURVALLISUUSLUOKAN 1 LASERLAITEKLASS 1 LASER APPARATHP LaserJet 4000/4000 T/4000 N/4000 TN and

8-48 Parts and DiagramsFigure 8-25 250-sheet Tray 123456

Illustrations and Parts Lists 8-49 Table 8-28. 250-sheet Tray Item No. Part No. Quantity Description1 RF5-2505-000CN 1 each Mounting Assembly Separati

8-50 Parts and DiagramsFigure 8-26 Internal Components of Optional 500-sheet Universal Tray Assembly123456789101111121313

Illustrations and Parts Lists 8-51 Table 8-29. Internal Components of Optional 500-sheet Universal Tray AssemblyItem No. Part No. Quantity Description

8-52 Parts and DiagramsFigure 8-27 Optional 500-sheet Universal Tray Assembly41235687

Illustrations and Parts Lists 8-53 Table 8-30. Optional 500-sheet Universal Tray AssemblyItem No. Part No. Quantity Description1 RF5-2489-000CN 1 Sepa

8-54 Parts and DiagramsFigure 8-28 Envelope Feeder1243

Illustrations and Parts Lists 8-55 Table 8-31. Envelope FeederItem No. Part No. Exchange No. Quantity Description1 C4122A C4122-69001 1 Envelope Feede

8-56 Parts and DiagramsFigure 8-29 Internal Components of Duplexer234561

Illustrations and Parts Lists 8-57 Table 8-32. Internal Components of DuplexerItem No. Part No. Exchange No. Quantity Description1 C4123A C4123-69001

Safety Information 1-27 Toner SafetyNote Toner may stain clothing. Skin and clothing are best cleaned by removing as much Toner as possible with a dry

8-58 Parts and DiagramsAlphabetical Parts ListTable 8-33. Alphabetical Parts ListDescription Part Number Table Number and Page250-sheet Universal Repl

Illustrations and Parts Lists 8-59 Cable, Paper Feed/Tray 1 Pickup SolenoidRG5-3703-000CN Table 8-7 on page 8-15Cable, Sensor RG5-3711-000CN Table 8-2

8-60 Parts and DiagramsCover Feeder Right Assembly RG5-2668-000CN Table 8-21 on page 8-37Cover, Left with Connector RF5-1876-000CN Table 8-32 on page

Illustrations and Parts Lists 8-61 Font DIMM (8 MB Asian MROM)Traditional ChineseSimplified ChineseEuroC4292AC4293AC4210ATable 8-1 on page 8-4Foot RB1

8-62 Parts and DiagramsLevers, Tray Sensing Lower RB1-9034-000CN Table 8-25 on page 8-45Levers, Tray Sensing Upper RB1-9033-000CN Table 8-25 on page 8

Illustrations and Parts Lists 8-63 Paper Feeder Cable RG5-3822-000CN Table 8-29 on page 8-51Paper Pickup Drive Assembly, Optional 500-sheet TrayRG5-26

8-64 Parts and DiagramsRoller, Transport Pressure RB1-8922-000CN Table 8-24 on page 8-43Screw, M3x16, Feed Modules XA9-0917-000CN Table 8-21 on page 8

Illustrations and Parts Lists 8-65 Spring, Leaf RB1-8927-000CN Table 8-29 on page 8-51Spring, Pickup RS5-2632-000CN Table 8-22 on page 8-39Spring, Rea

8-66 Parts and DiagramsTray, Rear Extension RB1-8844-000CN Table 8-5 on page 8-11Upper Paper Pickup Drive Assembly (250-sheet)RG5-2683-000CN Table 8-2

Illustrations and Parts Lists 8-67 Numerical Parts ListTable 8-34. Numerical Parts ListPart Number Description Table Number and Page92215N Macintosh N

1-28 Printer DescriptionEnvironmental Product StewardshipProtecting the EnvironmentHewlett-Packard Company is committed to providing quality products

8-68 Parts and DiagramsC4127A Toner Cartridge (6,000 Pages) Table 8-1 on page 8-4C4127X Toner Cartridge (10,000 pages)Table 8-1 on page 8-4C4135-67901

Illustrations and Parts Lists 8-69 RB1-8690-000CN Retainer, Toner Sensing SpringTable 8-8 on page 8-17RB1-8693-000CN Spring, Toner Cartridge Drum Grou

8-70 Parts and DiagramsRB1-8858-000CN Panel, Formatter Cover Table 8-5 on page 8-11RB1-8860-000CN Clip, Right Side Panel Table 8-5 on page 8-11RB1-886

Illustrations and Parts Lists 8-71 RB1-9044-000CN Cover, Top Table 8-32 on page 8-57RB1-9045-000CN Panel, Rear Table 8-32 on page 8-57RB1-9047-000CN C

8-72 Parts and DiagramsRG5-2645-000CN Support, Top Cover, Right Table 8-7 on page 8-15RG5-2648-000CN Delivery Assembly Table 8-7 on page 8-15 and Tabl

Illustrations and Parts Lists 8-73 RG5-2685-000CN Feeder, Control PCA Table 8-25 on page 8-45RG5-2688-000CN Left Frame Assembly Table 8-29 on page 8-5

8-74 Parts and DiagramsRH7-5172-000CN Solenoid, Tray 1 Drive Table 8-13 on page 8-27RS5-0911-000CN Gear, Coupler Table 8-9 on page 8-21RS5-0946-000CN

Index-1 IndexNumerics250-sheet tray, paper specifications 1-13500-sheet tray, paper specifications 1-12AAC/DC power distribution 5-2accessories 8-4

Index-2Engine Controller Board Assembly 8-22removing and replacing 6-44engine controller subsystem 5-6Engine Module 6-42engine test 7-11Envelope

Index-3 Paper Pickup Drive Assembly 8-38Paper Pickup Drive assemblylower 8-47upper 8-46paper specificationscard stock 1-23envelopes 1-20guidelines f

Overview 2-1 2Service ApproachOverviewThis chapter discusses the following:●Service Approach●Parts and Supplies●Warranty Statement

Index-4Ttesting, engine 7-11thermistor 7-102timing diagrams 7-110tonercleaning spilled 4-4consumption 1-28toner cartridge 2-9, 5-22, 5-24detection

Wiring Diagram (HP LaserJet 4000/4000N)Printer controller PCAFuser paper delivery sensor 1Control PanelDuplexing unit driver PCADuplexing unitPS 106Fu

Wiring Diagram (HP LaserJet 4000 T/4000TN)Printer controller PCAFuser paper delivery sensor 1Control PanelDuplexing unit driver PCADuplexing unitPS 10

HP LaserJet 4000 and 4050 Series Printers Service ManualHP LaserJet 4000 and4050 Series PrintersService ManualPrinted on at least50% Total Recycled Fi

Hewlett-Packard Company11311 Chinden BoulevardBoise, Idaho 83714 USA© Copyright Hewlett-Packard Company 1999All Rights Reserved. Reproduction, adaptat

2-2 Service ApproachService ApproachRepair of the printer normally begins with use of the printer’s internal diagnostics in conjunction with the troub

Parts and Supplies 2-3 Parts and SuppliesOrdering InformationField replaceable and accessory part numbers are found in Chapter 8 of this manual. Repla

2-4 Service ApproachHelpful Documentation Table 2-1 lists part numbers to order documentation.Table 2-1. Helpful DocumentationItem Description or Use

Parts and Supplies2-5 Service and Support CD-ROM for the HPLaserJet 4050 PrintersAn interactive training CD-ROM for printer service representatives an

2-6 Service ApproachPhone Numbers for Ordering●SMO (Service Materials Organization)1-800-227-8164 (U.S. only)●SME (Support Materials Europe)(49 7031)

Parts and Supplies 2-7 HP Support Assistant Compact DiscThis support tool offers a comprehensive online information system designed to provide technic

2-8 Service ApproachEurope, Middle East, and AfricaAustria 0660-8218BelgiumDutch 0800 1 1906French 0800 1 7043Denmark 800-10453European International

Parts and Supplies 2-9 Toner Cartridge InformationThe Toner Cartridge is designed to simplify replacement of the major “consumable” parts. The Toner C

2-10 Service ApproachWarranty StatementThe warranty for this product gives you specific legal rights. There may also be other rights that vary from ar

Overview 3-1 3Printer OperationOverviewThis chapter discusses the following:●Using the Control Panel●Control Panel Menus●Service Mode●Testing the Prin

Contents-1Contents1 Printer DescriptionOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1Printer Fe

3-2 Printer OperationUsing the Control PanelControl Panel LayoutThe printer’s Control Panel consists of the following:Figure 3-1 Control Panel LayoutC

Using the Control Panel 3-3 Control Panel KeysTable 3-2. Control Panel KeysKey Function[Go]●Places the printer either online or offline.●Prints any da

3-4 Printer OperationSettings and DefaultsThe printer makes most printing decisions based on either temporary settings or permanent defaults. Note Set

Control Panel Menus 3-5 Control Panel MenusPress [Menu] for access to all Control Panel menus. When additional trays or other accessories are installe

3-6 Printer OperationQuick Copy Jobs MenuThis menu provides a list of the quick copy jobs stored on the printer’s hard disk. The user can print or del

Control Panel Menus 3-7 Private/Stored Jobs MenuThis menu provides a list of the private and stored jobs on the printer’s hard disk. The user can prin

3-8 Printer OperationInformation MenuThis menu contains printer information pages that give details about the printer and its configuration. To print

Control Panel Menus 3-9 Paper Handling MenuWhen paper handling settings are correctly configured through the Control Panel, you can print by choosing

3-10 Printer OperationTRAY 1 TYPE=PLAINFor supported paper types see page 1-12.This item appears only when TRAY 1 MODE= CASSETTE. Set the value to cor

Control Panel Menus 3-11 OVERRIDE A4/ LETTER=NONOYESChoose YES to print on letter size paper when an A4 job is sent, but no A4 size paper is loaded in

Contents-23 Printer OperationOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Using the Control Pa

3-12 Printer OperationPrint Quality MenuSome items in this menu can be accessed from a software application, or from the printer driver (if the approp

Control Panel Menus 3-13 RET=MEDIUM OFFLIGHTMEDIUMDARKUse the printer’s Resolution Enhancement technology (REt) setting to produce print with smooth a

3-14 Printer OperationTONER DENSITY=3 12345Lighten or darken the print on the page by changing the Toner density setting. The settings range from 1 (l

Control Panel Menus 3-15 Printing MenuSome items in this menu can be accessed from a software application, or from the printer driver (if the appropri

3-16 Printer OperationUNIT OF MEASURE=INCHES(110V printers)orMILLIMETERS(220V printers)INCHESMILLIMETERSThis item appears only when CONFIGURE CUSTOM P

Control Panel Menus 3-17 PCL FONTSOURCE=INTERNALINTERNALSOFTSLOT 1, 2, OR 3INTERNAL: Internal fonts.SOFT: Permanent soft fonts.SLOT 1, 2, or 3: Fonts

3-18 Printer OperationPCL SYMBOLSET=PC-8PC-8many othersSelect any one of several available symbol sets from the printer’s Control Panel. A symbol set

Control Panel Menus 3-19 APPEND CR TO LF=NONOYESSelect YES to append a carriage return to each line feed encountered in backward-compatible PCL jobs (

3-20 Printer OperationConfiguration MenuItems in this menu affect the printer’s behavior. Configure the printer according to your printing needs.Table

Control Panel Menus 3-21 RESOURCE SAVE=OFFOFFONAUTODedicate printer memory to save each language’s permanent resources. (You might need to add memory

Contents-3 5 Functional InformationOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1Power Supply S

3-22 Printer OperationPAGE PROTECT=AUTOAUTOONThis item appears only after a 21 PAGE TOO COMPLEX, PRESS GO TO CONTINUE message displays. Memory Enhance

Control Panel Menus 3-23 TONER LOW=CONTINUECONTINUESTOPDetermine how the printer behaves when Toner is low. The TONER LOW message will first appear wh

3-24 Printer OperationJAM RECOVERY=AUTOAUTOONOFFDetermine how the printer behaves when a paper jam occurs.AUTO: The printer automatically selects the

Control Panel Menus 3-25 QUICK COPYJOBS = 32(HP LaserJet 4050 series printer with hard disk installed only)1 to 50Specifies the number of quick copy j

3-26 Printer OperationI/O MenuItems in the I/O (input/output) Menu affect the communication between the printer and the computer.Table 3-11. I/O MenuI

Control Panel Menus 3-27 PARALLEL HIGHSPEED=YESYESNOSelect the speed at which data is transmitted to the printer.YES: The printer accepts faster paral

3-28 Printer OperationSERIAL ROBUST XON=ONONOFFThis item appears only when SERIAL PACING=XON/XOFF. Select the method for generating XONs.ON: The print

Control Panel Menus 3-29 EIO Menu (Networked Printers)EIO (enhanced input/output) Menus depend on the particular accessory product installed in an EIO

3-30 Printer OperationCFG TCP/IP=NO NOYESNO: The TCP/IP Menu is not accessible.YES: The TCP/IP Menu appears. In the TCP/IP Menu, you can specify BOOTP

Control Panel Menus 3-31 Resets MenuUse this menu with caution. You can lose buffered page data or printer configuration settings when you select thes

Contents-46 Removing and Replacing PartsOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1Removal a

3-32 Printer OperationService ModeService Mode should be used only by authorized service personnel. While in Service Mode, you can:●Verify and set the

Service Mode 3-33 Service MenuFigure 3-2 Service MenuSetting the Page Count, Maintenance Count, and Serial NumberThe page count and printer serial num

3-34 Printer OperationPage CountThe page count stored in NVRAM and displayed on the Configuration Page printout represents the number of pages which t

Service Mode 3-35 Maintenance Page CountThe maintenance page count should be reset only after a maintenance kit has been installed. This will reset th

3-36 Printer OperationMAINTENANCE COUNT in the Service Mode Menu sets the page count interval at which the next service is due for the printer. This i

Testing the Printer 3-37 Testing the PrinterWhen you print a Configuration Page, the printer checks its internal controller and I/O interface, and the

3-38 Printer OperationResetting the PrinterCold ResetCold reset clears all data from the printer memory and sets all the defaults back to the factory

System Configuration 3-39 System ConfigurationMS-DOS System ConfigurationTo communicate properly with the printer, the MS-DOS environment requires the

3-40 Printer OperationSerial MS-DOS CommandsMost IBM compatible computers default to a parallel printer port. To ensure that information is sent to th

Printer I/O Configuration 3-41 Printer I/O ConfigurationParallel MenuThe default setting for the HIGH SPEED PARALLEL I/O is YES. If it is set to NO, t

Contents-5 7 TroubleshootingOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1Troubleshooting Proce

3-42 Printer OperationPacing (Handshaking)Pacing (or “handshaking”) is a type of communication between the printer and the computer. This is an import

Overview 4-1 4Printer MaintenanceOverviewThis chapter discusses the following:●Cleaning the Printer and Accessories●Preventative Maintenance

4-2 Printer MaintenanceCleaning the Printer and AccessoriesTo maintain high print quality and performance, thoroughly clean the printer and the paper

Cleaning the Printer and Accessories 4-3 Table 4-1. Cleaning the PrinterComponent Cleaning Method / NotesOutside Covers Use a water-dampened cloth. Do

4-4 Printer MaintenanceUsing the Printer Cleaning PageIf Toner specks appear on the front or back side of your print jobs, follow the procedure below.

Preventative Maintenance 4-5 Preventative MaintenanceThe preventative maintenance cycle for this printer is every 200,000 pages. To order the maintena

4-6 Printer MaintenanceExpected Life of ComponentsThe following table shows the expected life of certain components in the printer. To order parts, se

Overview 5-1 5Functional InformationOverviewThis chapter presents a generalized functional overview of the printer and the printing processes. This ch

5-2 Functional InformationPower Supply SystemAC/DC Power DistributionAC power is supplied to the low-voltage power supply circuit in the Engine Contro

Power Supply System 5-3 Overcurrent Overvoltage ProtectionThe Fusing Heater Safety Circuit is located on the Engine Controller Board, and constantly m