This service manual cover models:

HP LaserJet Managed E42540
HP LaserJet Managed E40040
HP LaserJet Enterprise MFP M431
HP LaserJet Enterprise MFP M430
HP LaserJet Enterprise M407
HP LaserJet Enterprise M406

Language and Format: English/PDF
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Table of content:
1) Printer information, configurations, configurations, configurations, configurations, and specifications specifications specifications
Information (document feeder and scanner)
Document feeder and scanner front view
Specifications Specifications Specifications (document feeder and scanner)
Technical specifications specifications specifications
Information (base printer)
Printer front view (SFP)
Printer back view (SFP)
Printer front view (MFP)
Printer back view (MFP)
Configuration Configuration Configuration Configuration (base printer)
Configuration Configuration Configuration Configuration (base printer SFP)
Configuration Configuration Configuration Configuration (base printer MFP)
Specifications Specifications Specifications (base printer)
Technical specifications specifications specifications (M406/M407)
Technical specifications specifications specifications (E40040)
Technical specifications specifications specifications (M430/M431)
Technical specifications specifications specifications (E42540)
Printer dimensions (SFP)
Printer dimensions (MFP)
Printer space requirements
Power consumption, electrical specifications, specifications, specifications, and acoustic emissions
Operating-environment range
Information (input devices)
550-sheet paper feeder front view


2) Printer installation and maintenance
Document feeder / scanner
Clean the pickup rollers and separation pad in the document feeder (MFP)
Check the scanner glass for dirt and smudges
Base printer
Remove and replace the cartridge
Print a cleaning page
Automatic cleaning page
Clean the Tray 1 roller and separation pad
Clean the Tray 2 rollers
Input devices
Clean the Tray 3 rollers


3) Theory of operation
Document feeder / scanner
Document feeder simplex operation
Scanning and image capture system
Base printer
Basic operation
Formatter-control system
Engine-control system
Engine laser/scanner system
Input devices
Tray 3


4) Solve problems
Service and support
Determine the problem source
Pre-troubleshooting checklist
Troubleshooting flowchart flowchart flowchart flowchart
Firmware upgrades
Comprehensive list of troubleshooting tools
Engine test
Pre-boot menu options
Advanced configuration configuration configuration configuration with the Embedded Web Server (EWS)
Print menu (SFP) and Copy/Print menu (MFP)
Defeating interlocks
LED Diagnostics (formatter)
Disable cartridge check
Print/stop test
Individual component diagnostics
Diagrams: Block diagrams
Diagrams: External plug and port locations
Diagrams: Major component locations
Diagrams: General timing chart
Diagrams: General circuit diagrams
Internal test and information pages
Reports menu
Settings menu
Supplies menu
Trays menu
Support Tools menu
Service menu
Printer resets
Format Disk and Partial Clean functions
Troubleshooting power-on or blank control panel problems
Troubleshooting an unresponsive printer
Engine diagnostics
Engine test
Defeating interlocks
Control panel troubleshooting
Control panel system diagnostics (MFP)
Control panel messages document (CPMD)
How to search for printer documentation
Error-code and control-panel-message troubleshooting overview
Solve paper handling problems
Clear paper jams (SFP)
Clear paper jams (MFP)
Printer feeds incorrect page size
Printer pulls from incorrect tray
Printer will not duplex or duplexes incorrectly (duplex models)
Paper does not feed from Tray 2-X
Output is cur led or wrinkled
The printer does not pick up paper
The printer picks up multiple sheets of paper
The document feeder jams, skews, or picks up multiple sheets of paper (MFP)
Paper does not feed automatically
Image-quality troubleshooting
Print-quality troubleshooting
Copy-quality troubleshooting
Performance and connectivity troubleshooting
Solve fax or email problems
Solve performance problems
Solve connectivity problems


5) Removal and replacement
Service and support
Order parts, accessories, and supplies
Ordering
Orderable parts
Supplies and accessories
Customer self-repair parts
Service and support
Assembly locations
Printer front view (SFP)
Printer back view (SFP)
Printer front view (MFP)
Printer back view (MFP)
Customer self-repair (CSR) A parts and accessories
Removal and replacement: RM2-5392-010CN 250-sheet paper input tray
Removal and replacement: RM2-5413-000CN optional Tray 3 cassette
Removal and replacement: 3PZ15-67966 multipurpose tray roller
Removal and replacement: 3PZ15-67965 Tray 2 paper pickup roller assembly
Removal and replacement: 3PZ15-67964 Tray 2 separation roller assembly
Removal and replacement: 3PZ15-67968 optional Tray 3 paper pickup roller assembly
Removal and replacement: 3PZ15-67967 optional Tray 3 separation roller assembly
Removal and replacement: Document feeder / scanner
Removal and replacement: Document feeder top cover assembly with rollers
Removal and replacement: ISA lift assembly and slider pin (MFP)
Removal and replacement: Integrated scanner assembly (MFP)
Removal and replacement: External panels, covers, and doors (base printer)
Removal and replacement: Damper sheets
Removal and replacement: Support shaft
Removal and replacement: Cartridge door assembly
Removal and replacement: Pressure-release link
Removal and replacement: Left cover
Removal and replacement: Right cover
Removal and replacement: Rear door assembly
Removal and replacement: Cassette rear cover
Removal and replacement: Control panel mount top cover (MFP)
Removal and replacement: Top cover (MFP)
Removal and replacement: USB cable guide (MFP)
Removal and replacement: Integrated scanner assembly (ISA) FFC cover
Removal and replacement: Top cover (SFP)
Removal and replacement: Keypad cover and indication cover (SFP)
Removal and replacement: Paper delivery tray (output bin)
Removal and replacement: Internal parts and assemblies (base printer)
Removal and replacement: Fuser
Removal and replacement: Registration assembly
Removal and replacement: Main motor (M1)
Removal and replacement: Power switch printed circuit assembly
Removal and replacement: Fax PCA and cable (MFP)
Removal and replacement: Fax cable guide (MFP)
Removal and replacement: USB port and cable (MFP)
Removal and replacement: Island of Data (IOD)
Removal and replacement: embedded Multi-Media Card (eMMC)
Removal and replacement: Formatter PCA
Removal and replacement: Fan (FM1)
Removal and replacement: Fan holder (FM1)
Removal and replacement: Laser scanner assembly
Removal and replacement: Formatter FFC
Removal and replacement: DC controller
Removal and replacement: Connecting PCA
Removal and replacement: Laser scanner FFC
Removal and replacement: High-voltage power supply
Removal and replacement: Low-voltage power supply
Removal and replacement: Control-panel assembly (SFP)
Removal and replacement: Control panel assembly (MFP)
Removal and replacement: Control panel interconnect board (MFP)
Removal and replacement: Control panel mount base and interconnect board chassis (MFP)
Removal and replacement: Control panel cable and cable cover (MFP)
Removal and replacement:RM2-5375-000CN Tray 2 sensor assembly
Removal and replacement: 550-sheet paper feeder
Removal and replacement: D9P29-67018 optional 550-sheet paper feeder
Removal and replacement: RM2-5413-000CN optional Tray 3 cassette
Removal and replacement: 3PZ15-67968 optional Tray 3 paper pickup roller assembly
Removal and replacement: 3PZ15-67967 optional Tray 3 separation roller assembly


6) Parts and diagrams
Service and support
Order parts by authorized service providers
Ordering
Orderable parts
Supplies and accessories
Customer self-repair parts
How to use parts lists and diagrams
Document feeder and image scanner
Parts and diagrams: Covers (M406/M407/E40040)
Parts and diagrams: Covers (M430/M431/E42540)
Parts and diagrams: Internal assemblies (1 of 3)
Parts and diagrams: Internal assemblies (2 of 3)
Parts and diagrams: Internal assemblies (3 of 3)
Parts and diagrams: 550-sheet paper feeder covers
Parts and diagrams: 550-sheet paper feeder main body
Alphabetical parts list
Numerical parts list

Appendix A Certificate Certificate Certificate Certificate Certificate of Volatility
Certificate Certificate Certificate Certificate Certificate of Volatility
Appendix B Glossary of terms
Index