HP Color LaserJet Managed MFP E77422a E77422dv E77422dn E77428dn Service Manual and Parts List Manual

Service Manual and Parts List Manual HP Color LaserJet Managed MFP E77422a E77422dv E77422dn E77428dn;
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 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 Managed photocopier.
To see what contain, please read table of contents:

1. PRODUCT SPECIFICATIONS AND DESCRIPTION
Printer views
Printer front view
Printer back view
Interface ports
Control-panel view
How to use the touchscreen control panel
Printer specifications
Technical specifications
Supported operating systems
Printer dimensions
Power consumption, electrical specifications, and acoustic emissions
Operating-environment range
Mobile printing solutions
General specifications
Print specifications
Scan specifications
Copy specifications
Maintenance and Consumable Life
Paper handling specifications
Pickup, feed, and delivery system
Feeding system overview
Main components and functions
Cassette (Tray 2, 3, 4, 5)
Pickup unit
Registration unit
Tray 1 feed assembly
Image formation system
Image formation process overview
Imaging unit
Imaging unit overview
Drum drive
Developer unit
Image Transfer Belt (ITB) Unit
Image transfer belt (ITB) unit overview
Image transfer belt (ITB) drive
Image transfer belt (ITB) cleaning
Fuser unit
Fuser unit overview
Fuser unit drive
Fuser unit temperature control
Laser scanning unit assembly (LSU)
Laser scanning unit assembly (LSU) overview
Laser scanner assembly overview
Laser synchronizing detectors
Automatic CPR adjustment
Drive system
Drive motors
Main drive unit (OPC/DEVE/ITB/Transfer Roller/Disengage/Engage motors)
Pickup drive
Registration/Tray 1 drive
Feed drive
Fuser/exit drive
Toner collection unit drive
Toner supply drive
Flatbed scanner system
Scanner system overview
Scanning system components
Full rate (FR) carriage components
Half rate (HR) carriage (mirror unit) components
Imaging unit components
Driving wire
Flatbed(Platen) glass
Drive motor
Timing belt
Automatic Paper Size(APS) sensor
Home sensor
Cover open sensor #1
Cover open sensor #2
ADF glass
Shading sheet
Precautions for unpacking and moving the scanner
Automatic document feeder (ADF)
Automatic document feeder (ADF) overview
Electrical parts location
Automatic document feeder drive system
Automatic document feeder(ADF) drive system overview
Automatic document feeder(ADF) original pickup assembly
Automatic document feeder(ADF) registration drive assembly
Automatic document feeder(ADF) feed drive assembly
Automatic document feeder(ADF) exit drive assembly
Automatic document feeder(ADF) original return drive assembly
Hardware configuration
Engine controller board(ECB)
Formatter
Low voltage power supply (LVPS; Type 5H) / Switching mode power supply (SMPS)
Fuser drive board (FDB)
High-voltage power supply (HVPS) PCA
Eraser PCA
Waste sensor PCA
Toner CRUM joint PCA
Paper size sensor PCA
Power key PCA
Walkup USB PCA
Dual cassette feeder
Dual cassette feeder (DCF) block diagram
Dual cassette feeder (DCF) components
Dual cassette feeder (DCF) paper path
Dual cassette feeder (DCF) electrical parts location
Dual cassette feeder (DCF) sensors and signals
Dual cassette feeder (DCF) paper feeding system
Dual cassette feeder (DCF) plug and jack locations

2. PARTS, DIAGRAMS, REMOVAL AND REPLACEMENT
For additional service and support
Order parts by authorized service providers
Ordering
Orderable parts
Supplies parts numbers
Accessories part numbers
Related documentation and software
How to use the parts lists and diagrams
Electrostatic discharge
Service approach
Before performing service
After performing service
Post-service test
Maintenance
Clean the printer
Check the scanner glass for dirt and smudges (MFP)
Cleaning the laser scanner assembly window
Main parts
Main assembly 1 (Right side and rear side)
Main assembly 1 (Right side and rear side)
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Formatter PCA
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Engine controller board (ECB)
1st Exit assembly
1st Exit assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: 1st exit assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Fuser unit
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Intermediate transfer belt (ITB) cleaner
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Intermediate transfer belt (ITB) unit
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: LVPS fan
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: LVPS board
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Fuser drive board (FDB)
Main assembly 2 (Front side and left side)
Main assembly 2 (Front side and left side)
Remove and replace the toner collection unit
Remove and replace the toner cartridge
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Laser scanning unit assembly (LSU)
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: High-voltage power supply (HVPS) board
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Imaging drum unit
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Developer unit
Frame assembly
Main engine frame 1
Main engine frame (1/2)
Fuser & Exit drive assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Pickup drive units
Registration & MP tray drive assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Paper feed drive assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Toner supply drive assembly
Main drive assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Toner collection unit drive assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Fan, type7 fuser
Main engine frame 2
Main engine frame (2/2)
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Toner duct assembly
Registration assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Feed sensor 1
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: Feed sensor 2
Main frame pickup assembly
Main frame
Main frame parts
Front frame
Rear frame
Color plane registration (CPR) assembly
Frame main middle plate LSU
Covers
Control panel assembly
Control panel assembly (4.3 inch model)
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Control panel assembly (4.3 inch), USB host PCA, and humidity & encoder sensor
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Control panel assembly, USB host PCA, and humidity & encoder sensor
MP right door assembly
MP right door parts
ENWW ix
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: MP right door assembly
Tray 1 (MP) parts
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: Tray 1 main rollers
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: Tray 1 (MP) unit and Tray 1 (MP) solenoid
Right door output
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: Fuser out sensor
Right door feed guide parts
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Transfer roller assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Duplex sensor and loop sensor
Scanner assembly
Scanner assembly
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Scanner whole unit for control panel assembly 109mm (4.3in)
HP Color LaserJet Managed MFP E77422, E77428 – Removal and replacement: Scanner whole unit for control panel assembly 203mm (8in)
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: Scanner Glass
Scanner lower parts
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: Scanner imaging unit
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: Scanner APS sensor
Automatic document feeder (ADF) assembly
Automatic Document Feeder (ADF) upper parts
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: ADF whole unit
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: ADF open cover
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: ADF stacker
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: ADF PCA
Automatic Document Feeder (ADF) main frame parts
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: ADF registration, cover, and detect sensors
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: ADF motor
Document lid assembly
Document lid assembly
HP LaserJet Managed MFP E72425, E72430, E77422, E77428 – Removal and replacement: Document lid assembly
Optional dual-cassette feeder (DCF)
Removal and replacement: Dual-cassette feeder (DCF) rear cover
Removal and replacement: Dual-cassette feeder (DCF) right door
Removal and replacement: Dual-cassette feeder (DCF) PCA
Removal and replacement: Dual-cassette feeder (DCF) motor
Removal and replacement: Dual-cassette feeder (DCF) motor
Removal and replacement: Dual-cassette feeder (DCF) motor

3. PROBLEM SOLVING
Error code and control panel message troubleshooting overview
Error codes
How to search for printer documentation
Troubleshooting process
Determine the problem source
Power subsystem
Power-on checks
Control panel checks
Control panel diagnostic flowcharts
Individual component diagnostics
Tools for troubleshooting: LED diagnostics
Tools for troubleshooting: Engine diagnostics
Tools for troubleshooting
Tools for troubleshooting
Problem-solving checklist
Step 1: Check that the printer power is on
Step 2: Check the control panel for error messages
Step 3: Test print functionality
Step 4: Test copy functionality
Step 5: Test the fax sending functionality
Step 6: Test the fax receiving functionality
Step 7: Try sending a print job from a computer
Step 8: Test the plug and print USB drive printing functionality
Factors that affect printer performance
Print menu map
Print current settings pages
Print event log
Pre-boot menu options
Open the Pre-boot menu from a touchscreen control panel
Cold reset using the Pre-boot menu from a touchscreen control panel
Remote Admin
Required software and network connection
Connect a remote connection
Disconnect a remote connection
Control panel menus
Reports menu
Settings menu
Copy menu (MFP only)
Scan menu (MFP only)
Fax menu (fax models only)
Print menu
Supplies menu
Trays menu
Troubleshooting menu
Maintenance menu
Backup/Restore menu
Calibration/Cleaning menu
USB Firmware Upgrade menu
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
Clear paper jams
Paper jam locations
Clear paper jams in the document feeder – 31.13.yz
Clear paper jams in Tray 1 (multipurpose tray) – 13.A1
Clear paper jams in Tray 2, Tray 3, and the optional 2 x 520-sheet trays – 13.A2, 13.A3, 13.A4
Clear paper jams in the output bin – 13.E1
Clear paper jams in the right door and fuser area – 13.B9, 13.B2, 13.FF
Service mode (tech mode)
Entering service mode
Service mode menu tree
Information tab
General
Supply Status
Software Version
Fault Log
Print Reports
Maintenance Counts tab
Fault Count
Part Replacement Count
Diagnostics tab
Engine diagnostics
Scanner Diagnostics
Adjustment
Image management
Print Test Patterns
Service Functions tab
Main Memory Clear
Debug Log
Capture Log
TR Control Mode
Part Replacement Alert
Envelope Rotate
Drain
Print quality troubleshooting guide
Image quality problems and solutions
Vertical black band
Vertical white band, light band
Horizontal periodic black band or dot
Horizontal periodic light/dark band or dot
Foggy image
Light image
Blurred image
Incorrect color registration
Uneven pitch and jitter image
Skewed image
Blank copy
Poor fusing performance
Stain on back of paper
Duplex blur, white spot blur on color print-out
Solve connectivity problems
Solve wired network problems
Introduction
Poor physical connection
The computer is unable to communicate with the printer
The printer is using incorrect link and duplex settings for the network
New software programs might be causing compatibility problems
The computer or workstation might be set up incorrectly
The printer is disabled, or other network settings are incorrect
Other Errors
Image system problem
Fuser problem
Scanner and ADF problems
Drive unit problem
Feeding system problem
Laser scanning unit assembly (LSU) problem
Electrical circuit problem
Firmware upgrades
Adjusting the laser scanning unit assembly (LSU) skew error
Adjusting the ADF skew

4. SCHEMATIC DIAGRAMS
PCAs, Boards, and Laser Scanning Unit(LSU)
Formatter
Low Voltage Power Supply (LVPS) and Fuser Drive Board (FDB)
High Voltage Power Supply (HVPS) and Laser Scanning Unit Assembly (LSU)
Temp/Humidity sensor (4.3 inch CP)
Exit section
Exit assembly
Drive section
Main drive assembly
Registration & Tray 1 (MP) drive assembly
Fuser & Exit drive assembly
Paper feed drive assembly
Toner supply drive assembly
Paper pickup drive assembly
Paper handling section
First & Second pickup assembly
Registration assembly
Frame section
Front frame
Rear frame
Automatic color registration (ACR) assembly
Feed sensor
Fuser section
Fuser assembly
MP right door section
Right door assembly
Tray 1 (MP) assembly
Right door feed guide
Right door output
Scanner section
Scanner assembly (1/2)
Scanner assembly (2/2)
Automatic Document Feeder (ADF) section
Automatic Document Feeder (ADF) assembly (1/2)
Automatic Document Feeder (ADF) assembly (2/2)
Image formation section
Image transfer belt (ITB) assembly
Toner cartridges
TC Sensor
Toner crum & Eraser sensor

5. INNER FINISHER
Product Specification and Description
Inner finisher view
Specification
Inner finisher system
Overview
Punch unit (optional)
Entrance unit
Diverter unit
Exit unit
Paper support unit
Paddle unit
Tamper unit
End fence unit
Stapler unit
Ejector unit
Output tray & paper holding unit
PCA connection information
Service approach
Before performing service
ESD precautions
After performing service
Post-service test
Print-quality test
Order parts, accessories, and supplies
Ordering
Orderable parts
Parts, diagrams, removal and replacement (inner finisher)
Parts and diagrams (inner finisher)
Inner finisher (main)
Inner finisher (covers)
Inner finisher (main paddle unit, entrance unit, exit unit, paper holding unit, and output tray unit)
Inner finisher (paper support unit)
Inner finisher (tamper unit)
Inner finisher (stapler unit, end fence unit)
Inner finisher (stapler assembly, entrance unit)
Inner finisher (ejector unit)
Covers
Front cover (C1)
Rear cover (C8)
Middle cover (C3)
Top cover (C2)
PCA cover (C6)
Left cover (C7)
Entrance unit
Entrance sensor (S1)
Entrance motor (M10)
Exit unit
Exit sensor (S21)
Exit motor (M2)
Exit roller (R3)
Paper support unit
Front paper support
Rear paper support
Rear paper support
Paper support home sensor (S12)
Paper support motor (M8)
Paddle unit
Main paddle
Main paddle home sensor (S4)
Main paddle motor (M3)
Main paddle assembly
Sub paddle unit
Tamper unit
Front tamper
Front tamper
Front tamper home sensor (S5)
Front tamper motor (M9)
Rear tamper
Rear tamper
Rear tamper home sensor (S14)
Rear tamper motor (M5)
Stapler unit
Stapler
Stapler position sensor (S2)
Stapler position motor (M1)
Ejector unit
Ejector & paper support assembly
Ejector motor assembly (S11/ M6/ M7)
Ejector assembly (include end fence, S10/ S16)
End fence unit
End fence sensor (S17)
Output tray unit
Output tray
Output tray top of stack sensor (S8)
Output tray lower limit switch (S7)
Output tray motor assembly
Output tray motor assembly (M4)
Output tray motor sensor (S6)
Output tray motor
Paper holding unit
Paper holding
Paper holding sensor (S9)
Paper holding solenoid (SL1)
Punch unit
Punch cover
Punch waste full sensor (S19)
Problem solving
Control panel message document (CPMD)
Schematic diagrams (inner finisher)
Punch waste full sensor
Punch waste box sensor and finisher docking sensor
Entrance motor
Exit sensor
Exit motor, main paddle motor & home sensor, output tray lower limit switch, and paper holding solenoid
Paper support motor & home sensor
Front tamper motor and home sensor
Rear tamper motor and home sensor
End fence sensor
Stapler position motor and sensor
Ejector 1 motor and home sensor, ejector 2 motor, motor sensor, and home sensor
Output tray motor and sensor
Output tray top of stack sensor
Top cover switch
Front cover switch

Appendix A Glossary
Glossary of terms
Appendix B Revision History
Revision History
Appendix C Certificate of Volatility
Certificate of Volatility
Index.

HP Color LaserJet Managed MFP E77422a E77422dv E77422dn E77428dn CLJ MFP E77422 E77428