Present Service Manual contain: Service Repair Manual and Service Troubleshooting Manual HP Color LaserJet Managed E75245 E85055, HP Color LaserJet Enterprise M751 M856 MFP M776;
This manual is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your HP copier.
You can print, zoom or read any diagram, picture or page from this 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 photocopier.
Content for REPAIR MANUAL:
1. REMOVAL AND REPLACEMENT
Conventions used in this guide
HP service and support
Removal and replacement strategy
Introduction
Considerations during removal and replacement
Electrostatic discharge
Required tools
Fasteners used in this printer
Service approach
Before performing service
After performing service
Print quality test
Removal and replacement procedures
Customer self-repair (CSR) A parts and accessories
Field replaceable units (FRUs)
2. PARTS AND DIAGRAMS
HP service and support
Order parts by authorized service providers
Ordering
Orderable parts
Supplies and accessories
Customer self-repair kits
HP service and support
Assembly locations
Printer front view (M751/E75245)
Printer back view (M751/E75245)
Printer front view (M856/E85055)
Printer back view (M856/E85055)
Printer front view (M776)
Printer back view (M776)
How to use the parts lists and diagrams
Parts and diagrams: Document feeder and image scanner (M776)
Parts and diagrams: Printer components
Parts and diagrams: Printer components (M751/E75245)
Parts and diagrams: Printer components (M856/E85055/M776dn/M776z)
Parts and diagrams: Printer components (M776zs)
Parts and diagrams: Inner finisher components
Parts and diagrams: Printer covers (Inner finisher)
Parts and diagrams: Printer internal assemblies (inner finisher; 1 of 3)
Parts and diagrams: Printer internal assemblies (inner finisher; 2 of 3)
Parts and diagrams: Printer internal assemblies (inner finisher; 3 of 3)
Parts and diagrams: 550-sheet tray components
Parts and diagrams: 550-sheet tray covers
Parts and diagrams: 550-sheet paper tray internal assemblies
Parts and diagrams: 2×550-sheet tray components
Parts and diagrams: 2×550-sheet tray covers
Parts and diagrams: 2×550-sheet paper tray internal assemblies (1 of 2)
Parts and diagrams: 2×550-sheet paper tray internal assemblies (2 of 2)
Parts and diagrams: High-capacity input (HCI) tray components
Parts and diagrams: High-capacity input (HCI) tray covers
Parts and diagrams: High-capacity input (HCI) tray internal assemblies (1 of 2)
Parts and diagrams: High-capacity input (HCI) tray internal assemblies (2 of 2)
Alphabetical parts list
Numerical parts list
Index
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Content for TROUBLESHOOTING MANUAL:
1. THEORY OF OPERATIONS
Conventions used in this guide
HP service and support
Basic operation
Sequence of operation
Formatter-control system
Sleep mode
Printer job language (PJL)
Printer management language (PML)
Control panel
Easy-access USB port
CPU
Input/output (I/O)
Memory
Engine-control system
DC controller
Low-voltage power supply
High-voltage power supply
Fuser control
Engine laser scanner system
Laser scanner failure detection
Safety
Image-formation process
Toner cartridges
Intermediate transfer belt (ITB) unit
Paper handling system
Paper handling functional blocks
Photo sensors and switches
Motors, clutches, and solenoids
Paper trays
Input accessories
550-sheet paper tray
2×550-sheet paper tray
HCI paper tray
Output accessories
Inner finisher
Document feeder system (M776)
Document feed system
Scanning and image capture system (M776)
2. SOLVE PROBLEMS
HP service and support
Solve problems checklist
Use the solve problems checklist
Print the Settings menu map
Print the current settings page
Print the event log
Pre-boot menu options
Troubleshooting process
Determine the problem source
Power subsystem
Control panel checks
Tools for troubleshooting
Individual component diagnostics
Diagrams
Internal test and information pages
Control panel menus
Error code and control panel message troubleshooting overview
Resolve print-quality problems
Introduction
Resolve print-quality problems
Print quality troubleshooting guide
Repetitive image defect ruler
Clean the printer
Clean the paper path
Print a cleaning page
Enable and configure auto cleaning
Check the scanner glass for dirt and smudges
Solve paper handling problems
Printer feeds incorrect page size
Printer pulls from incorrect tray
Printer will not duplex or duplexes incorrectly
Paper does not feed from Tray 2-X
Output is curled or wrinkled
Printer does not pick up paper or misfeeds
Inner finisher adjustments (M776zs only)
Clear paper jams
Paper path jam sensor locations
Auto-navigation for clearing paper jams
Experiencing frequent or recurring paper jams?
Clear paper jams in the document feeder – 31.13.yz (M776)
Clear paper jams in Tray 1 (13.A1)
Clear paper jams in Tray 2 (13.A2)
Clear jams in the fuser (13.B9, 13.B2, 13.FF)
Clear paper jams in the output bin (13.E1)
Clear jams in the duplex area (13.D3)
Clear paper jams in the 550-sheet paper tray (13.A3, 13.A4)
Clear paper jams in the 2×550-sheet paper tray and stand (13.A4, 13.A5)
Clear paper jams in the 2,700-sheet HCI paper tray and stand (13.A3, 13.A4, 13.A5, 13.A7)
Change jam recovery from the control panel
Solve performance problems
Factors affecting print performance
Print speeds
The printer does not print
The printer prints slowly
Solve connectivity problems
Solve USB connection problems
Solve wired network problems
Service mode functions
Open the service menu from an LCD control panel (M751/E75245)
Open the service menu from a touchscreen control panel (M856/E85055/M776)
Service menu items
Printer resets
Format Disk and Partial Clean functions
Firmware upgrades
Determine the installed revision of firmware
Perform a firmware upgrade
Solve fax or email problems
Appendix A Printer specifications
Printer dimensions
Printer space requirements
Power consumption, electrical specifications, and acoustic emissions
Operating-environment range
Certificate of Volatility
Index.