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Make/Model Information:

  • Brand:   Hewlett-packard
  • Models included:
    • HP LaserJet 3050
    • HP LaserJet 3052
    • HP LaserJet 3055

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English
  • Number of pages:   406
  • File size:  ∼ 15.95  MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   BMHP-1059

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HP LaserJet 3050/3052/3055 All-in-One
Service Manual
Table of contents
1 Product information
All-in-one configurations
HP LaserJet 3050 all-in-one
HP LaserJet 3052/3055 all-in-one
All-in-one features
All-in-one parts
HP LaserJet 3050 all-in-one parts
Front view
Back view
Interface ports
Control panel
HP LaserJet 3052/3055 all-in-one parts
Front view
Back view
Interface ports
Control panel
Model and serial numbers
Software installation
Typical installation
Minimum installation
Printer drivers
Supported printer drivers
Additional drivers
Select the correct printer driver
Printer-driver Help (Windows)
Gaining access to the printer drivers
What other software is available?
Software for Windows
Software components for Windows
HP ToolboxFX
Embedded Web server (EWS)
Using Add or Remove Programs to uninstall
Software for Macintosh
HP Director
Macintosh Configure Device (Mac OS X V10.3 and Mac OS X V10.4)
PDEs (Mac OS X V10.3 and Mac OS X V10.4)
Installing software for Macintosh
Installing Macintosh printing system software for direct
connections (USB)
Installing Macintosh printing system software for networks
ENWW iii
To remove software from Macintosh operating systems
Choosing paper and other print media
Supported media weights and sizes
Media to avoid
Media that can damage the all-in-one
2 Operation
Site preparation
Prepare the location
Operating environment
Minimum system requirements
Contents of the HP LaserJet 3050 all-in-one box
Contents of the HP LaserJet 3052/3055 all-in-one box
Installing input devices
Installing the print cartridge
Loading media into the input trays
Loading documents to fax, copy, or scan
Loading input trays
Priority input slot
250-sheet input tray (tray 1)
3 Maintenance
Managing supplies
Life expectancies of print cartridges and parts that wear
Ordering supplies
Storing print cartridges
Replacing and recycling supplies
Changing the print cartridge
Changing the ADF pickup roller and load-arm assembly (HP LaserJet
3052/3055 all-in-one)
HP policy on non-HP supplies
HP fraud hotline
Cleaning the all-in-one
To clean the exterior
To clean the ADF scanner glass and white platen (HP LaserJet 3050 all-in-one)
To clean the flatbed glass and the ADF scanner glass (HP LaserJet 3052/3055 all-in-
To clean the lid backing (HP LaserJet 3052/3055 all-in-one)
To clean the ADF pickup-roller assembly (HP LaserJet 3052/3055 all-in-one)
Cleaning the paper path
To clean the paper path from HP ToolboxFX
To clean the paper path from the all-in-one control panel
Calibrating the scanner
Managing and maintaining the all-in-one
Information pages
Demo page
Usage page
Configuration page
Network configuration page
Fax logs and reports
HP ToolboxFX
To view HP ToolboxFX
Event log
Fax tasks
Fax phone book
Fax Send Log
Fax Receive Log
System settings
Device information
Paper handling
Print quality
Paper types
System setup
Device polling
Print settings
Network settings
Macintosh Configure Device (Mac OS X V10.3 and Mac OS X V10.4)
Embedded Web server
4 Theory of operation
Basic operation
Sequence of operation
Sequence of operation, HP LaserJet 3050 all-in-one scanner
Sequence of operation, HP LaserJet 3052/3055 all-in-one scanner
Sequence of operation, HP LaserJet 3050/3052/3055 all-in-one printer
(product base)
HP LaserJet 3050/3052/3055 all-in-one timing diagram—printer (product
Formatter system
Central processing unit
Line interface unit (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one
Standard startup process
All-in-one startup messages
USB interface
Control panel
Enhanced I/O
PJL overview
Printer (product base) functions
Engine control system (engine control unit and power-supply assembly)
Print-engine control system
Printer (product base) laser/scanner
Power system on the power-supply assembly
Ac power distribution
Dc power distribution
High-voltage power distribution
Image-formation system
The seven image-formation processes
Print cartridge
Printer (product base) paper-feed system
Jam detection in the all-in-one
Conditions of jam detection
HP LaserJet 3050 all-in-one unique components
Basic operation
ADF pickup-and-feed system
Optical scanning system
HP LaserJet 3052/3055 all-in-one unique components
Scanner and ADF functions and operation
Scanner functions
Scanner operation
ADF operation
ADF paper path and ADF sensors
ADF jam detection
Fax functions and operation (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one
Computer and network security features
PSTN operation
Distinctive ring function
Faxing with Voice over IP services
The fax subsystem
Formatter in the fax subsystem
LIU in the fax subsystem
Safety isolation
Safety-protection circuitry
Data path
Hook state
Downstream current detection
Hook switch control
Ring detect
Line-current control
Billing- (metering-) tone filters
Fax page storage in flash memory
Stored fax pages
Advantages of flash-memory storage
5 Removal and replacement
Removal and replacement strategy
Electrostatic discharge
Required tools
Before performing service
After performing service
Post-service tests
Test 1 (print-quality test)
Test 2 (copy-quality test)
Test 3 (fax-quality test)
Parts removal order
HP LaserJet 3050 all-in-one
Link assemblies and scanner support-frame springs
Scanner side covers
Separation-pad set
Control-panel bezel
Control-panel assembly
Media lever and media-lever torsion spring
Separation-pad assembly
Scanner assembly
Scanner assembly top cover
Top-cover assembly
Pickup roller
White platen
HP LaserJet 3052/3055 all-in-one
ADF input tray
Flatbed lid
Link assemblies and scanner support-frame springs
Control-panel bezel
Control-panel assembly
ADF separation pad
ADF input-tray flag
ADF pickup roller and load-arm assembly (HP LaserJet 3052/3055 all-in-one)
ADF scanner glass
Scanner assembly
Printer (product base)
Printer separation pad
Print cartridge
Printer pickup roller
Installing the scanner cushions
Media input tray
Transfer roller
Side covers
Print-cartridge door
Rear cover and fuser cover
Front cover
Speaker assembly
Power supply
Formatter and line interface unit (LIU)
Scanner support-frame
Engine controller unit (ECU)
Laser/scanner assembly
ENWW vii
Main motor
Paper-pickup assembly
6 Troubleshooting
Troubleshooting process
Troubleshooting checklist
Control-panel messages
Alert and warning messages
Alert and warning message tables
Critical error messages
Critical error message-tables
Event-log codes
Causes of jams
Tips to avoid jams
Where to look for jams
Print cartridge area
Input trays
Output bin
Solving print paper-feed problems
Paper-feed solutions, printing
Jams occur in the automatic document feeder (ADF)
Solving ADF paper-feed problems
Paper-feed solutions, scanning/copying
Print image-quality problems
Checking the print cartridge
To redistribute the toner in the print cartridge
Solving print image-quality problems
Print image-quality solutions
Scan/copy image-quality problems
Scan/copy image-quality solutions
ADF problems
Fax troubleshooting (HP LaserJet 3050/3055 all-in-one)
General fax troubleshooting
Fax receive troubleshooting
Fax send troubleshooting
DSL problems
PABX line problems
Control-panel-display problems
Functional checks
Control-panel test
Half self-test functional check
To perform a half self-test check
To perform other checks
Drum-rotation functional check
High-voltage contacts check
To check the print-cartridge contacts
To check the high-voltage connector pins
Service-mode functions
viii ENWW
Secondary service menu
To gain access to the secondary service menu
To print a list of all the fax data-store parameters
Developer’s menu
To gain access to the developer’s menu
To adjust fax data-store parameters
To scroll quickly to a particular data-store parameter
Changing the country/region code parameters
To change the country/region from one location to another
To set the language and location if none is set
Soft reset
Performing a soft reset
Super NVRAM init
To perform a super NVRAM init
NVRAM init
To perform an NVRAM init
System settings for localized products
Printer job language (PJL) software commands
Troubleshooting tools
Printing a configuration report, demonstration page, or menu structure
Printing all fax reports at once (HP LaserJet 3050/3055 all-in-one)
T.30 protocol trace (HP LaserJet 3050 all-in-one and HP LaserJet 3055 all-in-one only) 260
To print a T.30 protocol trace report
Fax error-correction mode (ECM) (HP LaserJet 3050 all-in-one
and HP LaserJet 3055 all-in-one only)
V.34 fax standard
Fax receive and fax send codes
Translating the fax trace report (HP LaserJet 3050 all-in-one and
HP LaserJet 3055 all-in-one only)
Repetitive image defect ruler
Firmware updates and recovery
7 Parts and diagrams
Ordering parts and supplies
Parts that wear
World-wide customer support
Common hardware
How to use the parts lists and diagrams
Replacing the printer engine assembly
Component locations, HP LaserJet 3050/3052/3055 all-in-one printer (product
Main wiring
Formatter PCA and LIU connectors
HP LaserJet 3050 all-in-one scanner assembly
ADF components, HP LaserJet 3050 all-in-one
Guide assembly, HP LaserJet 3050 all-in-one
HP LaserJet 3052/3055 all-in-one scanner assembly
Major assemblies, HP LaserJet 3052/3055 all-in-one
Scanner components, HP LaserJet 3052/3055 all-in-one
Printer (product base), HP LaserJet 3050/3052/3055 all-in-one
External covers, printer (product base)
Formatter and LIU
Internal components, printer (product base)
Alphabetical parts list
Numerical parts list
Appendix A All-in-one specifications
Physical specifications
Electrical specifications
Power consumption
Environmental specifications
Acoustic emissions
Appendix B Service and support
Hewlett-Packard limited warranty statement
Print Cartridge Limited Warranty Statement
Extended warranty
Appendix C Regulatory information
FCC compliance
Environmental Product Stewardship program
Protecting the environment
Ozone production
Power consumption
Toner consumption
Paper use
HP LaserJet printing supplies
HP Printing Supplies Returns and Recycling Program Information
U.S. returns
Non-U.S. returns
Material restrictions
Disposal of waste equipment by users in private household in the European Union
Material safety data sheet
For more information
Telephone Consumer Protection Act (United States)
IC CS-03 requirements
EU statement for telecom operation
New Zealand telecom statements
Declaration of conformity (HP LaserJet 3390, 3392, 3055, and 3050)
Declaration of conformity (HP LaserJet 3052)
Country-/region-specific safety statements
Laser safety statement
Canadian DOC statement
Korean EMI statement
Finnish laser statement
Power supply
1. Remove the rear cover and fuser cover. See Rear cover and fuser cover on page 170.
2. Disconnect one spade connector (callout 1) and remove three screws (callout 2).
Reinstallation tip The center screw in callout 2 is a ground screw and is different from
the others. When reinstalling the power supply, make sure that this screw is used in the
center hole.
Figure 5-116 Removing the power supply (1 of 5)
3. Disconnect one FFC (callout 3) and five wire-harne ss connectors (callout 4) and remove them from
the wire loom.
CAUTION Do not bend or fold the FFCs during the removal or reinstallation process.
Figure 5-117 Removing the power supply (2 of 5)
ENWW Printer (product base) 175
4. Remove four screws (callout 5).
Figure 5-118 Removing the power supply (3 of 5)
5. Unclip two clips (callout 6) and remove the switch cover.
Figure 5-119 Removing the power supply (4 of 5)
176 Chapter 5 Removal and replacement ENWW
V.34 fax standard
V.34 is the industry-wide fax standard for full-duple x modems that transmit at speeds up to 28,000 bps.
When V.34 is turned on, the product automatically adjusts the transmission speed based on the clarity
of the image. Turning V.34 off can resolve some fax transmission issues.
To change the V.34 setting
1. Press Menu.
2. Use the < or > button to select Fax setup, and then press
3. Use the < or > button to select All faxes, and then press
4. Use the < or > button to select V.34, and then press
5. Use the < or > button to select On or Off, and then press
to save the selection.
Fax receive and fax send codes
The following tables list the fax receive and fax send codes that appear in the fax call report.
Table 6-6 Fax receive codes
Code Description Recommended action
200 The fax session has been completed without
None required.
221 The user has pressed Cancel, which caused
the fax session to be prematurely halted.
Allow the product to receive the fax.
222 The product has answered a call but has been
unable to detect the presence of a fax
machine. Typically, this is caused by the
product answering a voice call.
The remote user canceled the fax
transmission by pressing Cancel immediately
before, or just as, the product answered the
The remote machine automatically ended the
call immediately before, or just as, the product
answered the call.
The remote (calling) fax machine identified a
feature incompatibility between the two
machines and disconnected immediately
before transmitting any additional fax tones or
T.30 frames. (This is a very rare and non-
standard behavior.)
1. Confirm that the remote caller is a fax machine and
not a voice call. (Typically the remote user must
inform the caller that the fax session failed.)
2. If the remote machine ends the call just as the
product starts receiving, reduce the ring count after
which the product answers. Or, suggest that the
remote user manually dial to the product and then
manually start the fax session by pressing Start
after fax tones have been heard from the product.
3. Confirm that the remote user is not inadvertently
attempting a poll transmission from the product
instead of transmitting to the product.
4. Reconfigure the local fax machine to use different
configuration settings, change ECM to the opposite
of the current setting, and/or select a slower
reception speed.
223 (ECM error) The product has been unable to receive an
entire page even after multiple attempts to
receive the parts of the page that contain
Attempt to receive the fax again after telephone-line
conditions have improved.
ENWW Troubleshooting tools 261


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