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Make/Model Information:

  • Brand:   Hewlett-packard
  • Models included:
    • HP Color LaserJet CM4730 MFP CB480A
    • HP Color LaserJet CM4730f MFP CB481A
    • HP Color LaserJet CM4730fsk MFP CB482A
    • HP Color LaserJet CM4730fm MFP CB483A

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English
  • Number of pages:   876
  • File size:  ∼ 40.92  MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   BMHP-1021

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HP Color LaserJet CM4730 MFP
Service Manual
Table of contents
1 Product information
Product comparison
HP Color LaserJet CM4730 MFP
HP Color LaserJet CM4730f MFP
HP Color LaserJet CM4730fsk MFP
HP Color LaserJet CM4730fm MFP
Product features
Product walkaround
Front view
Back view
Interface ports
Serial number and model number location
Media specifications
Understand paper and print media use
Supported paper and print media sizes
Custom paper sizes
Special paper or print media guidelines
Information pages
2 Installation
Installation checklist
Unpacking the MFP
Connecting power
Installing print cartridges
Installing a new control panel overlay
Install memory and print server cards
Install memory and fonts
Install DDR memory DIMMs
Install a flash memory card
Enabling memory
Install an HP Jetdirect or EIO print server card
Test the MFP operation
Sleep and wake
Connecting to a computer or network
Parallel connection
USB connection
Auxiliary connection
Fax connection
Analog faxing
ENWW iii
Connecting the fax accessory to a phone line
Configuring and using the fax features
Digital faxing
Printer software
Software for Windows
Supported Windows versions
Install the printing-system software
Install Windows printing-system software for direct connections
(USB or parallel)
Install Windows printing-system software for networks
Use Windows-sharing on a network
Install the software after the parallel or USB cable has been
Supported printer drivers
Remove software for Windows
Select the correct printer driver
Universal printer drivers
Driver Autoconfiguration
Update Now
Priority for print settings
Open the printer drivers
Software for Macintosh
Software for Macintosh computers
Install software for Macintosh
Install Macintosh software for direct connections (USB)
Install Macintosh software for networks
Remove software from Macintosh operating systems
Software for other operating systems
HP Web Jetadmin
Network utilities
HP Web Jetadmin
Embedded Web server
HP Easy Printer Care software
Other components and utilities
Network configuration
Configure TCP/IPv4 parameters
Change the IP address
Set the subnet mask
Set the default gateway
Configure TCP/IPv6 parameters
Disable network protocols (optional)
Disable IPX/SPX
Disable AppleTalk
Disable DLC/LLC
HP Jetdirect EIO print servers
Security features
Secure the embedded Web server
Foreign Interface Harness (FIH)
Using the FIH
Enable the FIH portal
Disable the FIH portal
Secure Disk Erase
Data affected
Gaining access to Secure Disk Erase
Additional Information
Job storage features
DSS authentication
Locking the control panel menus
Locking the formatter cage
Optional output and input devices
3 Manage and maintain
Control-panel menus
Use the control panel
Control-panel layout
Home screen
Buttons on the touchscreen
Control-panel help system
Navigate the Administration menu
Information menu
Default Job Options menu
Default Options for Originals
Image adjustment
Default Copy Options
Default Fax Options
Default E-mail Options
Default Send to Folder Options
Default Print Options
Time/Scheduling menu
Management menu
Initial Setup menu
Networking and I/O
Fax Setup
E-mail Setup
Send Setup menu
Device Behavior menu
Print Quality menu
Troubleshooting menu
Resets menu
Service menu
Management tools
Information pages
HP Easy Printer Care software
Supported operating systems
Open HP Easy Printer Care software
HP Easy Printer Care software sections
Embedded Web server
Open the embedded Web server
Information tab
Settings tab
Digital Sending tab
Networking tab
Other links
HP Web Jetadmin software
HP Printer Utility for Macintosh
Open the HP Printer Utility
Print a cleaning page
Print a configuration page
View supplies status
Order supplies online and use other support features
Upload a file to the printer
Update the firmware
Activate the two-sided printing (duplexing) mode
Lock or unlock printer storage devices
Save or print stored jobs
Configure trays
Change network settings
Open the embedded Web server
Set up e-mail alerts
Approximate replacement intervals for supplies
ETB life under different circumstances
Managing print cartridges
HP print cartridges
Change print cartridges
Non-HP print cartridges
Print cartridge authentication
Print cartridge storage
Print cartridge life expectancy
Checking the supply level
Using the product control panel
Using the embedded Web server
Using HP Web Jetadmin
Replacing supplies
Locate supplies
Supply replacement guidelines
Making room around the MFP for replacing supplies
Replacing the ETB
Replacing the fuser
Replacing the stapler cartridge
Using the cleaning page
Clean the MFP
Clean the outside of the MFP
Clean the touchscreen
Clean the scanner glass
Cleaning the ADF delivery system
Clean the ADF delivery system
Clean the ADF rollers
Clean the mylar strip
Performing preventive maintenance
ADF maintenance kit
Calibrate the scanner
Set the real-time clock
Set the date format
Set the date
Set the time format
Set the time
4 Theory of operation
Basic operation
Operation sequence
Operation sequence (scanner)
Power on sequence
Formatter system
Sleep mode
Image Resolution Enhancement technology (REt)
Parallel interface
USB 2.0 connector
ACC accessory port
Hard disk
FIH (foreign interface harness)
MFP memory
Read-only memory
Random-access memory
DIMM slots
Flash memory
Nonvolatile memory
PJL overview
Control panel
Scanner interface
Engine control system
DC controller PCB
Block operation
Motors, fans, and environment sensor
Failure detection
Drum motor failure detection
Fuser motor failure detection
ETB motor failure detection
Rear exhaust fan failure detection
Cartridge fan failure detection
Delivery fan failure detection
Power supply fan failure detection
Scanner fan failure detection
ADF fan failure detection
Control fans #1 and #2 failure detection
ENWW vii
Sub power supply fan failure detection
ETB fan failure detection
Low-voltage power supply
Fuser control circuit
Low-voltage power supply circuit
Protective functions
Sleep mode
Power supply recognition
Heater temperature control
Initial rotation temperature control
Start-up temperature control
Print temperature control
Between-sheets temperature control
Temperature protective function
Protective function by the CPU
Protective function by the fuser heater safety circuit
Protective function by the thermoswitch
Temperature failure detection
Start-up failure (warm-up failure)
Abnormal low temperature of main thermistor (no conduction)
Abnormal high temperature of main thermistor
Abnormal low temperature of sub thermistor (no conduction)
Abnormal high temperature of sub thermistor
Drive circuit abnormality
High-voltage power supply
Generation of biases
Sub power supply assembly
Video interface control
Laser/scanner system
Laser control
.... 162
Scanner control
Image formation system
Image formation process
Electrostatic latent image formation block
Step 1: Pre-exposure
Step 2: Primary charging
Step 3: Laser beam exposure
Development block
Step 4: Development
Transfer block
Step 5: Attraction
Step 6: Transfer
Step 7: Separation
Fusing block
Step 8: Fusing
Cleaning block
Step 9: Drum cleaning
Print cartridges
Memory tag
viii ENWW
Cartridge presence detection
Memory tag detection
Photosensitive drum detection
Developing cylinder disengaging control
ETB (electrostatic transfer/transport belt)
Transfer roller (Y, C, M) engagement/disengagement detection
Transfer roller engagement/disengagement control
Calibration and cleaning
ETB cleaning
Color misregistration corrective control
Color misregistration detection
Image stabilization control
Environmental change control
Image density calibration control (DMAX)
Image halftone calibration control (DHALF)
Image density detection
Pickup/feed system
Pickup/feed unit
Cassette detection and cassette media size detection
Cassette pickup operation
Media lifting operation
Initial lift
Lift-up during printing
Multiple-feed prevention
Skew correction
Media detection
Feed speed control
Fusing and delivery block
Loop control
Fusing pressure release mechanism
Duplex feed unit
Duplexing reverse/duplexing feed operation
Jam detection
Pickup delay jam
Pickup stationary jam
Delivery delay jam
Door open jam
Residual paper jam
Reversing unit jam 1
Reversing unit jam 2
Duplexing pickup unit jam 1
Automatic delivery function
Scanner system
Electrical system
Motors and fans
Optical assembly
ADF feed system
ADF jam detection
Residual media jam
ADF pickup jam
ADF jam
Registration sensor jam
Read sensor jam
Exit sensor jam
ADF cover-open jam
ADF open jam
2 X 500-sheet paper feeder
Pickup and feed operations
2 X 500-sheet jam detection
Output devices
IPTU transfer operation
IPTU jam detection
Pickup delay jam
Pickup stationary jam
Delivery delay jam
Delivery stationary jam
3-bin mailbox system
Stacker mode
Mailbox mode
Function-separator mode
Jam detection
Feed-delay jam
Feed-stationary jam
Residual-media jam
Power-on sequence
MBM driver
MBM switches and sensors
MBM list of signals
Stapler/stacker system
Power-on sequence
Staple mode
Jogger operation
Jogger home-position detection
Stacker mode
Jam detection
Stapler unit
Staple home position detection
Self-priming detection
Staple level detection
Stapler/stacker switches and sensors
Stapler/stacker motors, solenoid, and fan
Stapler/stacker PCBs
Stapler/stacker driver PCB
Stapler/stacker driver list of signals
5 Removal and replacement
Removal and replacement strategy
Required tools
Before performing service
After completing service
Screws used in the MFP
Service approach
User-replaceable parts
Print cartridges
Control panel overlays
Control panel
Intermediate paper transfer unit (IPTU)
Staple cartridge
3-bin mailbox
ETB assembly, removing
MP tray pickup assembly
Trays 2, 3, and 4
ADF input tray
ADF pickup and feed rollers
ADF separation pad
ADF delivery guide (clear mylar sheet)
Face-down tray assembly
Tray 2, 3, or 4 pickup and feed rollers
MP tray pickup roller
Tray 2 separation roller
Tray 3 or 4 separation rollers
Scanner filter cover and scanner filter
ADF hinge flap
Formatter board
Hard drive
Flash memory card (firmware)
Fax accessory
Covers, doors, and external panels
Face-down tray assembly
Delivery cover assembly
Rear cover assembly
Left cover assembly
Front cover assembly
Tray 1
Right lower cover assembly
Delivery upper cover assembly
Right front inner lower cover assembly
Left rear inner cover assembly
Right front inner upper cover assembly
Right rear inner cover assembly
Main assembly (internal assemblies)
Paper feed assembly
Pickup drive assembly
Lifter drive assembly
Disengaging drive assembly
Main drive assembly
Rail holder assembly
Rail guide assembly
Formatter case assembly
Laser/scanner components
Duplexing assembly
Delivery assembly
Fuser drive assembly
Motors and fans
Drum motors
Fuser motor
Fuser pressure release motor
Developing disengaging motor
Pickup motor assembly
Power supply fan
Cartridge fan
Sub power supply fan
Delivery fan
Control fan 1
Control fan 2
Rear exhaust fan
ETB fan
DC controller PCB
Toner level PCB
High-voltage power supply PCB
Low-voltage power supply PCB
Memory controller PCB
Sub power supply PCB
Fan drive PCB
Switches, contacts, and sensors
High-voltage contacts
E-label memory contacts and cable
Power switch assembly
Door-open switch assembly
Environment sensor
ADF and scanner components
ADF assembly
Top covers
Scanner assembly
Scanner left cover
Scanner right cover
Scanner controller PCB
ADF components
ADF output bin extension
ADF white mylar backing
ADF front cover
ADF rear cover
ADF left side cover
ADF jam access cover and latch
xii ENWW
ADF leading-edge and paper-present sensors
ADF hinges
2 X 500-sheet paper input assembly components
Rear cover
Right front cover
Left front cover
Right cover
Left cover
Right lower cover assembly
Pickup motor assembly
Upper lifter drive assembly
Lower lifter drive assembly
Upper pickup drive assembly
Lower pickup drive assembly
Upper pickup assembly
Lower pickup assembly
Paper feeder door-open switch
Paper feeder driver PCB
Intermediate paper transfer unit (IPTU)
Front cover and front door
IPTU rear cover
Connector cover assembly
IPTU driver PCB
IPTU driver motors
Stapler/stacker components
Delivery tray
Front cover
Rear cover
Left cover
Top cover
Bottom cover
Stapler unit
...... 497
Jogger unit
Stapler/stacker driver PCB
3-bin mailbox components
Rear cover
Front cover
Delivery tray
Left cover
Upper cover
Right-door unit
Bottom cover
MBM driver PCB
6 Problem solving
Problem-solving process
Problem-solving checklist
Problem-solving flowchart
Power-on checks
Control-panel messages
ENWW xiii
Understand accessory lights for the 3-bin mailbox and stapler/stacker
Understand lights on the formatter
HP Jetdirect LEDs
Heartbeat LED
Replacement parts configuration
Formatter and DC controller
Formatter (new or previously installed in another MFP)
DC controller (new or previously installed in another MFP)
Paper path troubleshooting
Jam locations
Jam recovery
Clearing jams in the right covers
Jam in Tray 1
Jam in Tray 2, 3, or 4
Jam in the stapler/stacker
Staple jams
Jam in the 3-bin mailbox
Other jams in the output accessory bridge
Jam in the ADF
Solving repeated jams
Persistent jams
Basic troubleshooting for jams
Data collection
General paper path troubleshooting
Paper path checklist
Jams in Tray 1
Jams in tray 2
Jams in Tray 3
Jams in Tray 4
Jams in the paper path
Jams in the right upper cover
Jams in the duplex path
Jams in the ADF
Jams in the IPTU
Jams in the stapler/stacker
Jams in the 3-bin mailbox
Using the paper path test
Using the scanner tests
Correct print quality and copy quality problems
Print quality problems associated with media
Color printing problems
Printout color error
Incorrect shade
Missing color
Cartridge error
Color match error
Overhead transparency defects
Print quality problems associated with the environment
Print quality problems associated with jams
Print quality troubleshooting pages
xiv ENWW
Print quality troubleshooting tool
Image defect examples
Horizontal lines or streaks
Misaligned color
Vertical lines
Repetitive defects
Color fade in all colors
Color fade in one color
Fingerprints and media dents
Loose toner
Smeared toner
White areas on page
Media damage
Specs or stray toner
Skewed, stretched, or off-center page
Blank page
Horizontal lines
Page skew
Vertical lines
Image shifted
Unexpected image
Calibrate the MFP
Repetitive defect ruler
Manage color
Understand color variations
Use color
HP ImageREt 3600
Paper selection
Color options
Restrict color use
Restrict color printing
Restrict color copying
Print in grayscale
Automatic or manual color adjustment
Manual color options
Halftone options
Neutral grays
Edge control
RGB color
Adjusting color balance
Color selection process
Matching colors
PANTONE color matching
Swatch book color matching
Media transport problems
Solve e-mail problems
Validate the SMTP gateway address
Validate the LDAP gateway address
Solve fax problems
Network connectivity problems
Troubleshooting network printing problems
Loopback test
Ping test
Functional checks
Engine test
Formatter test
MFP resets
Cold reset
NVRAM initialization
Tools for troubleshooting
Individual component diagnostics
LED diagnostics
Engine diagnostics
Diagnostics mode
Diagnostics that put the engine into the special diagnostics
Diagnostic tests
Paper path sensor test
Manual sensor test
Scanner tests
Component tests
Service ID
Converting the service ID to an actual date
Troubleshooting the embedded HP Jetdirect print server
Firmware-stack trace
Diagrams for troubleshooting
DC controller connections
Scanner controller PCB connections
Locations of major components
Sensors and switches
Sensors and switches
Motors, fans, and solenoids
Motors and solenoids
Scanner and ADF components
ADF and scanner sensors
ADF pickup assembly sensors
ADF motors, fans, and solenoids
2 X 500-sheet feeder
General timing chart
General circuit diagrams
Upgrade the firmware
Determine the current firmware version
Download new firmware from the HP Web site
Transfer the new firmware to the MFP
Use FTP to upload the firmware through a browser
Use FTP to upgrade the firmware on a network connection
xvi ENWW
Use HP Web Jetadmin to upgrade the firmware
Use MS-DOS commands to upgrade the firmware
Use the HP Jetdirect firmware
7 Parts and diagrams
Ordering parts and supplies
Parts that wear
Customer support
Supplies and accessories
Assembly locations
Major components
External covers and panels
Internal components
ADF components
Scanner components
2 X 500-sheet feeder components
Optional devices
3-bin mailbox
Intermediate paper transfer unit (IPTU)
Alphabetical parts list
Numerical parts list
Appendix A Supplies and accessories
Order parts, accessories, and supplies
Order directly from HP
Order through service or support providers
Order directly through the embedded Web server
Optional output devices
Output accessory bridge
3-bin mailbox
Part numbers
Print cartridges
Maintenance kits
Customer replaceable units
Cables and interfaces
Appendix B MFP specifications
Physical specifications
Electrical specifications
Acoustic specifications
Environmental specifications
Image area
Skew specifications
ENWW xvii
Appendix C Regulatory information
Compliance with FCC regulations
Declaration of Conformity
Environmental product stewardship program
Protecting the environment
Ozone production
Power consumption
Toner consumption
Paper use
HP LaserJet print supplies
Return and recycling instructions
United States and Puerto Rico
Multiple returns (two to eight cartridges)
Single returns
Non-US returns
Material restrictions
Disposal of waste equipment by users in private households in the European Union
Material Safety Data Sheet (MSDS)
For more information
Certificate of volatility
Types of memory
Volatile memory
Non-volatile memory
Hard-disk-drive memory
Safety statements
Laser safety
Canadian DOC regulations
VCCI statement (Japan)
Power cord statement (Japan)
EMI statement (Korea)
EMI statement (Taiwan)
Toxic and Hazardous Substance Table
General telecom statement
Laser statement for Finland
xviii ENWW
6 Problem solving
? Problem-solving process
Control-panel messages
Understand accessory lights for the 3-bin mailbox and stapler/stacker
Understand lights on the formatter
Replacement parts configuration
Paper path troubleshooting
Correct print quality and copy quality problems
Manage color
Media transport problems
Solve e-mail problems
Solve fax problems
Network connectivity problems
Functional checks
MFP resets
Tools for troubleshooting
Diagrams for troubleshooting
Upgrade the firmware
ENWW 511
Problem-solving process
When the MFP malfunctions or encounters an unexpected situation, information on the control panel
alerts you to the situation. This section contains an initial troubleshooting checklist that helps to
eliminate many possible causes of the problem. The subsequent troubleshooting flowchart helps you
to diagnose the cause of the problem. The remainder of the chapter provides steps for correcting the
problems that have been identified.
? Use the initial troubleshooting checklist to evaluate the source of the problem and to reduce the
number of steps that are required to fix the problem.
? Use the troubleshooting flowchart to pinpoint the cause of malfunctions. The flowchart lists the
section within this chapter that provides steps for correcting the malfunction.
Before beginning any troubleshooting procedure, check the following:
? Are supply items (for example, the print cartridge, fuser, and rollers) within their rated life?
? Does the configuration page reveal any configuration problems?
NOTE: The customer is responsible for checking and maintaining supplies, and for using
supplies that are in good condition. The customer is responsible for media and print-cartridge
supplies. The customer is also responsible for replacing the fuser, transfer roller, and all paper
pickup, feed, and separation rollers (tray 1 has a separation pad instead of a roller) that are at
or near the end of their 225,000-page rated life.
Problem-solving checklist
If the MFP is not responding correctly, complete the steps in the following checklist, in order. If the
MFP does not pass a step, follow the corresponding troubleshooting suggestions. If a step resolves
the problem, you can stop without performing the other steps on the checklist.
1. Make sure the MFP Ready light is on and the display says Ready. If no lights are on, see
Power-on checks on page 516.
2. Check the cabling.
a. Check the cable connection between the MFP and the computer or network port. Make
sure that the connection is secure.
b. Make sure that the cable itself is not faulty by using a different cable, if possible.
c. Check the network connection. See
Network connectivity problems on page 615.
3. Ensure that the print media that you are using meets specifications. See
Media specifications
on page 13.
4. Print a configuration page. If the MFP is connected to a network, an HP Jetdirect page also
a. If the pages do not print, check that at least one tray contains print media.
b. If the page jams in the MFP, see
Paper path troubleshooting on page 554.
512 Chapter 6 Problem solving ENWW
7 Parts and diagrams
This chapter contains information about ordering parts, supplies, and accessories. It includes
diagrams of the major subassemblies of the MFP and includes the part numbers for replaceable parts.
Ordering parts and supplies
Assembly locations
External covers and panels
Internal components
ADF components
Scanner components
2 X 500-sheet feeder components
Optional devices
Alphabetical parts list
Numerical parts list
ENWW 663


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