HP Color LaserJet Enterprise M750n, M750dn Service Manual & Parts List

Service Manual & Parts List HP Color LaserJet Enterprise M750n, M750dn;
This manual is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your HP.
You can print, zoom or read any diagram, picture or page from this Service Manual & Parts List. 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. 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)
1×250 cassette
Paper pick-up assembly
Paper delivery assembly
Printed circuit assemblies
1×500 paper feeder
1x500PF external components
1x500PF internal components
1x500PF PCA
3×500 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.