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Service Manual & Parts List HP Color LaserJet Enterprise M750n, M750dn; This service manual, is the full HP Color LaserJet Enterprise M750n, M750dn Service Repair Manual. This manual, HP Color LaserJet Enterprise M750n, M750dn, is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your HP Color LaserJet Enterprise M750n, M750dn copier. You can print, zoom or read any diagram, picture or page from this Service Manual. Every chapter on this manual is fully detailed and contain all the simulation codes, trouble codes, maintenance procedures, reset procedures, diagnose procedures of HP Color LaserJet Enterprise M750n, M750dn photocopier. You can find easily everything what do you need. To see what contain, please read table of contents: 1. THEORY OF OPERATION Basic operation Major product systems Product block diagram Sequence of operation Normal sequence of operation Formatter-control system Sleep mode Input/output CPU Memory Firmware Nonvolatile memory PJL overview PML Control panel Engine-control system DC controller Motors Fans Fuser-control circuit Fuser temperature control Fuser protective function Fuser failure detection Low-voltage power supply Overcurrent/overvoltage protection High-voltage power supply Laser scanner system Laser failure detection Image-formation system Electrophotographic process Image formation process Latent-image formation block Pre-exposure Primary charging Laser beam exposure Developing block Transfer block Primary transfer Secondary transfer Separation Fusing block ITB cleaning block Drum cleaning block Print cartridges Memory tag Cartridge presence detection Toner level detection Cartridge life detection Developing unit engagement and disengagement control ITB unit Primary transfer roller engagement and disengagement control ITB unit presence detection ITB cleaning mechanism Calibration Color-misregistration control Environment change control Image stabilization control Image density control (DMAX) Image halftone control (DHALF) Pickup, feed, and delivery system Photo sensors Motors and solenoids Pickup and feed block Tray 2 cassette pickup Tray 2 cassette multiple-feed prevention Tray 2 cassette media-size detection and Tray 2 cassette-presence detection Tray 2 cassette lift-up operation Cassette media-presence detection Tray 1 (MP tray) paper pickup Tray 1 (MP tray) last-paper detection Paper feed Skew-feed prevention Media detection Feed-speed control Fusing and delivery block Loop control Pressure roller pressurization and depressurization control Output bin full detection Duplex block (duplex models only) Duplex reverse and duplex feed control Duplex operation Jam detection Paper feeder Paper-feeder motors Paper-feeder paper pickup and feed Cassette media-size detection and cassette-presence detection Paper-feeder cassette lift operation Paper-feeder jam detection Optional 3X500-sheet paper deck Motor control Pickup-and-feed operation Cassette media-size detection and cassette-presence detection Cassette lift-up operation Jam detection 2. REMOVAL AND REPLACEMENT Removal and replacement strategy Cautions during removal and replacement Required tools Types of screws Service approach Before performing service After performing service Parts removal order Removal and replacement procedures Print cartridges Toner-collection unit Fuser Reset the New Fuser Kit setting at the control panel Pickup roller (Tray 1) Separation pad (Tray 1) Separation roller assembly (Tray 2) Pickup roller (Tray 2) Pickup roller, separation roller, and feed roller (1 x 500-sheet and 3 x 500-sheet paper feeders) Secondary transfer roller Intermediate transfer belt (ITB) Reset the New Transfer Kit setting at the control panel Formatter PCA Hard Drive Remove the encrypted HDD Remove the solid-state module Covers Identification and location Right-front cover and control-panel assembly Left cover Rear cover Remove the rear cover Toner collection unit access door Right-rear cover Reinstall the right-rear cover Top cover Remove the top cover Front-door assembly Right-door assembly Main assemblies Formatter case Remove the formatter case Laser/scanner assembly Remove the laser/scanner assembly Paper pickup assembly Remove the paper pickup assembly Reinstall the paper pickup assembly Registration sensor assembly Remove the registration sensor assembly Lifter-drive assembly Remove the lifter-drive assembly ITB front guide assembly ITB rear guide assembly Residual toner full sensor Remove the residual toner full sensor Main drive assembly Remove the main drive assembly Install the main drive assembly Fuser drive assembly Remove the fuser drive assembly Install a replacement fuser drive assembly Fuser gear assembly Remove the fuser gear assembly Install a replacement fuser gear assembly Paper delivery assembly Remove the delivery assembly Reinstall the paper delivery assembly Duplex drive assembly (duplex models) Remove the duplex-drive assembly Delivery drive assembly (simplex models) Remove the delivery drive assembly Residual-toner-feed assembly Remove the residual-toner-feed assembly ITB motor (M1) Remove the ITB motor Drum motor (M2) Remove the drum motor Developing motor (M3) Remove the developing motor Fuser motor (M4) Remove the fuser motor Developing-disengagement motor (M6) Remove the developing-disengagement motor Power-supply fan (FM1) Remove the power-supply fan Fuser fan (FM2) Remove the fuser fan Formatter fan (FM3) and ICB PCA Remove the formatter fan and ICB PCA DC controller PCA Remove the DC controller PCA Low-voltage power supply Remove the low-voltage power supply Imaging (developing) high-voltage power supply Remove the imaging (developing) high-voltage power supply First transfer high-voltage power supply Remove the first transfer high-voltage power supply Second transfer high-voltage power supply Remove the second transfer high-voltage power supply Driver PCA Remove the driver PCA Power switch PCA Remove the power switch PCA Environmental sensor Remove the environmental sensor 1 x 500-sheet paper feeder assembly 1 x 500 rear cover 1 x 500 left cover 1 x 500 right-front cover 1 x 500 front-upper cover 1 x 500 right door 1 x 500 right-lower cover 1 x 500 pickup assembly 1 x 500 lifter-drive assembly 1 x 500 pickup motor 1 x 500 driver PCA 3 x 500-sheet paper feeder (optional accessory) 3 x 500 rear cover 3 x 500 right and left cassette rails 3 x 500 paper deck controller PCAs 3 x 500 paper deck lifter-drive assembly 3 x 500 paper deck pickup motor 3 x 500 front-lower cover 3 x 500 left cover 3 x 500 right-corner cover 3 x 500 front-upper cover 3 x 500 right-door assembly 3 x 500 right-lower cover 1 3 x 500 right-lower cover 2 3 x 500 left-lower cover 3 x 500 rear-lower cover Remove the 3 x 500 rear-lower cover 3 x 500 paper deck pickup assembly Remove the 3 x 500 paper deck pickup assembly 3. SOLVE PROBLEMS Solve problems checklist Menu map Current settings pages Control panel menus Sign In menu Retrieve Job From USB menu Retrieve Job From Device Memory menu Supplies menu Trays menu Administration menu Reports menu General Settings menu General Print Settings menu Default Print Options menu Display Settings menu Manage Supplies menu Manage Trays menu Network Settings menu Troubleshooting menu Device Maintenance menu Backup/Restore menu Calibration/Cleaning menu USB Firmware Upgrade menu Service menu Troubleshooting process Determine the problem source Pre-troubleshooting checklist Troubleshooting flowchart Power subsystem Power-on checks Power-on troubleshooting overview Tools for troubleshooting Component diagnostics LED diagnostics Understand lights on the formatter Engine diagnostics Defeating interlocks Disable cartridge check Engine test button Paper-path test Manual sensor test Front-door opening/closing switch (PS14) Right-door opening/closing sensor (PS15) TOP (top-of-page) sensor (PS5) Fuser loop sensors 1 and 2 (PS7 and PS8) Fuser pressure-release sensor (PS9) Fuser output sensor (PS6) Developer alienation sensor (PS11) ITB alienation switch (SW5) Tray/Bin manual sensor test Tray 1 paper sensor (PS2) Tray 2 paper present sensor (PS1) Tray 2 paper surface sensor (PS4) Tray 2 paper size switches (SW7 and SW8) Tray 3 paper sensor (SR3) Tray 3 paper surface sensor (SR2) Tray 3 paper size sensors (SW2 and SW3) Tray 3 feed sensor (SR1) Tray 3 door opening/closing sensor (SW1) Tray 4 paper sensor (SR3) Tray 4 paper surface sensor (SR2) Tray 4 paper size sensors (SW2 and SW3) Tray 4 feed sensor (SR1) Tray 4 door opening/closing door sensor (SW1) Tray 5 paper sensor (SR83) Tray 5 paper surface sensor (SR82) Tray 5 paper size sensors (SW82 and SW83) Tray 5 feed sensor (SR81) Tray 5 door opening/closing sensor (SW1) Tray 6 paper sensor (SR93) Tray 6 paper surface sensor (SR92) Tray 6 paper size sensors (SW92 and SW93) Tray 6 feed sensor (SR91) Tray 6 door opening/closing sensor (SW1) Output-bin-full sensor (PS10) Paper-path sensors test Print/stop test Component tests Component test (special-mode test) Additional component tests Diagrams Block diagrams Plug/jack locations Location of connectors DC controller connections Product connections Locations of major components General timing charts General circuit diagram Internal print-quality test pages Print-quality-troubleshooting pages Diagnostics page Configuration page Configuration page HP embedded Jetdirect page Finding important information on the configuration pages Color-band test Print quality troubleshooting tools Repetitive image-defect ruler Calibrate the product Control-panel menus Administration menu Reports menu General Settings menu General Print Settings menu Default Print Options menu Display Settings menu Manage Supplies menu Manage Trays menu Network Settings menu Troubleshooting menu Device Maintenance menu Backup/Restore menu Calibration/Cleaning menu USB Firmware Upgrade menu Service menu Interpret control-panel messages and event log entries Control-panel message types Control-panel messages and event log entries 10.0X.Y0 Supply memory error 10.22.50 10.22.51 10.22.52 10.23.50 10.23.51 10.23.52 10.23.70 Printing past very low 10.39.50 New Document Feeder Kit 10.39.53 10.39.55 Clean Document Feeder Rollers 10.39.56 10.39.60 Document Feeder Kit low 10.39.69 Document Feeder Kit very low 10.39.70 Scanning past very low 10.39.71 Document Feeder has stopped 10.XX.34 Used supply in use 10.XX.40 Genuine HP supplies installed 10.XX.41 Unsupported supply in use 10.XX.70 Printing past very low 10.YY.15 Install 10.YY.25 Wrong cartridge in slot 10.YY.35 Incompatible 11.00.YY Internal clock error 13.00.00 13.A3.D3 13.A3.D4 13.A3.D5 13.A3.D6 13.A3.FF 13.A4.D4 13.A4.D5 13.A4.D6 13.A4.FF 13.A5.A5 13.A5.D6 13.A5.FF 13.A6.D6 13.A6.FF 13.AA.EE 13.AB.EE 13.B2.AX 13.B2.DX 13.B2.FF 13.B4.FF 13.B9.AZ 13.B9.CZ 13.B9.DZ 13.B9.FF 13.B9.YZ Fuser Area Jam 13.BA.EE 13.BB.EE 13.E1.DZ 13.FF.FF 20.00.00 Insufficient memory: To continue, touch "OK" 21.00.00 Page too complex To continue, touch "OK" 32.1C.XX 33.02.01 33.02.02 33.02.03 33.03.01 33.03.02 40.00.01 USB I/O buffer overflow To continue, touch "OK" 40.00.02 Embedded I/O buffer overflow To continue, touch "OK" 40.00.04 Unsupported USB accessory detected To continue, touch "OK" 40.00.05 Embedded I/O bad transmission To continue, touch "OK" 40.08.0X USB storage accessory removed 40.0X.05 USB storage accessory removed 41.01.YZ 41.02.00 Error 41.02.0Z Error 41.03.YZ Unexpected size in Tray 41.03.YZ Unexpected size in Tray To use another tray, touch "Options" 41.04.YZ 41.05.YZ Unexpected type in Tray 41.05.YZ Unexpected type in Tray To use another tray, touch "Options" 41.07.YZ Error To continue, touch "OK" 41.WX.YZ Error To use another tray, touch "Options" 42.XX.YY 47.00.00 47.00.XX 47.01.XX 47.02.XX 47.03.XX 47.04.XX 47.05.00 47.06.XX 47.WX.YZ Printer calibration failed To continue, touch "OK" 48.01.XX Error 49.XX.YY Error To continue turn off then on 50.WX.YZ Fuser error To continue turn off then on 51.00.YY Error To continue turn off then on 52.00.00 or 52.20.00 To continue turn off then on 54.0X.07 54.11.05 or 54.12.05 54.XX.YY Error 55.XX.YY DC controller error To continue turn off then on 56.00.01 Illegal Input Printer Error To continue turn off then on 56.00.02 Selected media output bin unavailable 56.00.03 Media input path operation error 57.00.0Y Error To continue turn off then on 58.00.02 environmental sensor malfunction 58.00.04 Error To continue turn off then on 59.00.YY Error To continue turn off then on 59.0X.50 Error To continue turn off then on 59.0X.60 Error To continue turn off then on 59.0X.70 Error To continue turn off then on 59.0X.80 Error To continue turn off then on 60.00.0Y Tray lifting error 60.10.0Y Media input source pickup mechanism malfunction 61.00.01 62.00.00 No system To continue turn off then on 69.11.YY Error To continue, touch "OK" 70.00.00 Error To continue turn off then on 80.0X.YY Embedded Jetdirect Error 81.WX.00 Wireless Network Error To continue turn off then on 81.WX.YZ Embedded Jetdirect Error To continue turn off then on 98.00.0X Corrupt data in X volume 99.00.01 Upgrade not performed file is corrupt 99.00.02 Upgrade not performed timeout during receive 99.00.03 Upgrade not performed error writing to disk 99.00.04 Upgrade not performed timeout during receive 99.00.05 Upgrade not performed timeout during receive 99.00.06 Upgrade not performed error reading upgrade 99.00.07 Upgrade not performed error reading upgrade 99.00.08 Upgrade not performed error reading upgrade 99.00.09 Upgrade canceled by user 99.00.10 Upgrade canceled by user 99.00.11 Upgrade canceled by user 99.00.12 Upgrade not performed the file is invalid 99.00.13 Upgrade not performed the file is invalid 99.00.14 Upgrade not performed the file is invalid 99.00.2X 99.01.XX 99.02.01 99.02.09 99.05.56 99.09.60 Unsupported disk 99.09.61 Unsupported disk 99.09.62 Unknown disk 99.09.63 Incorrect disk 99.09.64 Disk malfunction 99.09.65 Disk data error 99.09.66 No disk installed 99.09.67 Disk is not bootable please download firmware 99.09.68 99.XX.YY full Remove all paper from bin almost full low OR Supplies low very low OR Supplies very low lifting [File System] device failure To clear press OK [File System] file operation failed To clear press OK [File System] file system is full To clear press OK [File System] is not initialized [File System] is write protected Accept bad signature Bad optional tray connection Calibration reset pending Canceling Canceling Checking engine Checking paper path Chosen personality not available To continue, touch ?OK? Cleaning do not grab paper Cleaning Clearing event log Clearing paper path Close front door Close lower right door Close middle right door Close right door Close upper right door For help press ? Cooling device Data received To print last page, press OK Event log is empty Expected drive missing HP Secure Hard Drive disabled Incompatible Incompatible supplies Initializing Install Install Close rear door Install Fuser Unit Install supplies Install Transfer Unit Internal disk not functional Internal disk spinning up Load Tray : [Type], [Size] Load Tray : [Type], [Size] To use another tray, touch OK Loading program Manually feed output stack Then touch "OK" to print second sides Manually feed: [Type], [Size] To continue, touch "OK" Manually feed: [Type], [Size] To use another tray, touch OK Moving solenoid Moving solenoid and motor No job to cancel Paused Performing Color Band Test Performing Paper Path Test Please wait Printing CMYK samples Printing Color Usage Log Printing Configuration Printing Demo Page Printing Diagnostics Page Printing Engine Test Printing Event Log Printing File Directory Printing Font List Printing Fuser Test Page Printing Help Page Printing Menu Map Printing PQ Troubleshooting Printing Registration Page Printing RGB Samples Printing stopped Printing Supplies Status page Printing Usage Page Processing duplex job Processing job from tray Processing Processing Ready Ready Remove all toner cartridges Remove at least one toner cartridge Remove shipping lock from Tray 2 Replace Replace supplies Restore Factory Settings Restricted from printing in color Rotating motor Rotating Motor Size mismatch in Tray Supplies in wrong positions Tray empty: [Type], [Size] Tray open Tray overfilled Troubleshooting Type mismatch Tray Unsupported drive installed To continue, touch "OK" Unsupported supply in use OR Unsupported supply installed To continue, touch "OK" Unsupported tray configuration Unsupported USB accessory detected Remove USB accessory USB accessory needs too much power Remove USB and turn off then on USB accessory not functional Used supply installed To continue, touch "OK" OR Used supply in use Wrong cartridge in slot Event log messages Print or view an event log Clear an event log Clear jams Common causes of jams Jam locations Clear jams in the upper-right door Clear jams in the lower-right door Clear jams in Tray 1 Clear jams from Tray 2, Tray 3, or an optional tray Clear jams in the output bin area Jam causes and solutions Jams in the output bin Jams in the fuser and transfer area Jams in the duplex area (duplex models only) Jams in Tray 1, Tray 2 and internal paper path Jams in Tray 3, 4, 5, and 6 Change jam recovery Solve paper-handling problems Product feeds multiple sheets Product feeds incorrect page size Product pulls from incorrect tray Paper does not feed automatically Paper does not feed from Tray 2, 3, 4, 5, or 6 Product will not duplex or duplexes incorrectly Use manual print modes Solve image-quality problems Print quality examples Clean the product Clean the paper path Solve performance problems Solve connectivity problems Solve direct-connect problems Solve network problems Service mode functions Service menu Product resets Restore factory-set defaults Preboot menu options Product updates Determine the installed revision of firmware Perform a firmware upgrade Embedded Web Server USB storage device (Preboot menu) USB storage device (control-panel menu) 4. PARTS AND DIAGRAMS Order parts by authorized service providers Order parts, accessories, and supplies Related documentation and software Supplies part numbers Customer self repair parts Service replacement parts Accessories part numbers How to use the parts lists and diagrams Assembly locations External covers, panels, and doors Right door assembly Internal components (1 of 9) Internal components (2 of 9) Internal components (3 of 9) Internal components (4 of 9) Internal components (5 of 9) Internal components (6 of 9) Internal components (7 of 9) Internal components (8 of 9) Internal components (9 of 9) 1x250 cassette Paper pick-up assembly Paper delivery assembly Printed circuit assemblies 1x500 paper feeder 1x500PF external components 1x500PF internal components 1x500PF PCA 3x500 paper feeder 3x500PF external components 3x500PF internal components 3x500PF cassette 3x500PF PCAs Alphabetical parts list Numerical parts list Appendix A Service and support Hewlett-Packard limited warranty statement HP's Premium Protection Warranty: LaserJet toner cartridge limited warranty statement Color LaserJet Fuser Kit, Transfer Kit, and Roller Kit Limited Warranty Statement Data stored on the toner cartridge End User License Agreement Customer self-repair warranty service Customer support Appendix B Product specifications Physical specifications Power consumption, electrical specifications, and acoustic emissions Environmental specifications Appendix C Regulatory information FCC regulations Environmental product stewardship program Protecting the environment Ozone production Power consumption Toner consumption Paper use Plastics HP LaserJet print supplies Return and recycling instructions United States and Puerto Rico Multiple returns (more than one cartridge) Single returns Shipping Non-U.S Paper Material restrictions Disposal of waste equipment by users Electronic hardware recycling Chemical substances Material Safety Data Sheet (MSDS) For more information Declaration of Conformity Certificate of Volatility Safety statements Laser safety Canadian DOC regulations VCCI statement (Japan) Power cord instructions EMC statement (China) Power cord statement (Japan) EMC statement (Korea) EMI statement (Taiwan) Laser statement for Finland GS statement (Germany) Substances Table (China) Restriction on Hazardous Substances statement (Turkey) Restriction on Hazardous Substances statement (Ukraine) Eurasian Conformity (Belarus, Kazakhstan, Russia) INDEX Numbers of pages: 668.