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HP Color LaserJet Printers
HP Color LaserJet 3550N Parts List
HP Color LaserJet 3550N (Q5991A)
MFG Part Number:
Q5991A
16ppm black, 600 x 600 DPI
Printer Support Links
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HP Color LaserJet 3500/3550/3700 series printer service manual
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Manual contents and shortcuts
Printer description
Chapter contents
Printer configurations
HP Color LaserJet 3500/3550 printer
HP Color LaserJet 3500n/3550n printer
HP Color LaserJet 3700 printer
HP Color LaserJet 3700n printer
HP Color LaserJet 3700dn printer
HP Color LaserJet 3700dtn printer
Printer features
Printer assemblies
Front and rear features
Site requirements
Space requirements
Electrical specifications
Environmental specifications
Printer specifications
Duty cycle
Print media specifications
Supported media weights and sizes
Hewlett-Packard warranty statement
HP's Premium Protection Print Cartridge Warranty Limited Warranty Statement
Premium Protection Warranty Color LaserJet Image Fuser Kit and Image Transfer Kit Limited Warranty S ...
Identification
Model and serial numbers
Power and regulatory information
Selecting paper
Paper that can damage the printer
Paper to avoid
Printing on special media
Colored paper
Glossy paper
Transparencies
Envelopes
Labels
Heavy paper
HP LaserJet Tough paper
Preprinted forms and letterhead
Media weight
Recycled paper
Environmental product stewardship program
Protecting the environment
Declaration of Conformities
Safety statements
Canadian DOC regulations
EMI statement (Korea)
Laser safety statement
VCCI statement (Japan)
Laser statement for Finland
FCC Regulations
Service approach
Chapter contents
Search approach
Parts and supplies
Ordering parts
Ordering supplies
Customer care reseller sales and service support center
Exchange program
HP service parts information CD-ROM
HP support assistant CD-ROM
Supplies
World Wide Web
Ordering related documentation and software
HP maintenance agreements
On-site service agreements
Installation and configuration
Chapter contents
Checking the package contents
Unpacking the printer
Installing the print cartridge
Loading paper into Tray 3 (optional)
Loading paper into Tray 2
Loading paper into Tray 1 (optional procedure)
Connecting power
Installing a new control panel overlay (optional)
Testing the printer operation
Using PowerSave Time
To disable/enable PowerSave
To set PowerSave Time
USB configuration
Connecting the USB cable
Parallel configuration (HP Color LaserJet 3700 series printer only)
Network configuration
Enhanced I/O (EIO) configuration (HP color LaserJet 3700 series printer only)
Available enhanced I/O interfaces
HP Jetdirect print servers
AppleTalk networks
NetWare networks
UNIX/Linux networks
Windows and Windows NT networks
Printer software
Printer drivers
Software for networks
Utilities
Setting security on the printer
Locking the control panel
Using an ASCII PJL escape sequence to set security
Printer memory for the HP Color LaserJet 3700 series printer
Installing memory and font DIMMs
Enabling memory
Enabling the language font DIMM (HP color LaserJet 3700 only)
Checking DIMM installation (HP color LaserJet 3700 only)
Installing an HP Jetdirect print server card in the HP color LaserJet 3700 series printer
To install the HP Jetdirect print server card
Installing an HP Jetdirect en3700 external print server
Printer maintenance
Chapter contents
Cleaning the printer and accessories
Cleaning spilled toner
Managing supplies
Approximate replacement intervals for supplies for the HP Color LaserJet 3500 series printer
Approximate replacement intervals for supplies for the HP Color LaserJet 3550/3700 series printer
Supplies life
Locating supplies and parts
Replacing supply items
Replacing the transfer unit
Replacing the fuser and pickup roller
Theory of operation
Chapter contents
Basic operation
Operation sequence
Power-on sequences
Engine control system
DC controller PCB
Low-voltage power supply circuit
Low-voltage power supply circuit
Laser/scanner system
Laser control
Scanner motor control
Image formation system
Print process
Developing section
Cartridge cleaning control
Transfer section
ITB cleaning control
Waste toner full detection
Transfer (ITB) unit detection
Transfer unit life detection
ITB self-aligning mechanism
Primary transfer roller engaging/disengaging control
Secondary transfer roller engaging/disengaging control
Secondary transfer roller engaging/disengaging detection
Color misregistration control
Image stabilization control
Pickup/feed system
Pickup/feed unit
Fuser/delivery unit
Duplexing feed unit (HP 3700 printer only)
Jam detection
Paper feeder
Pickup/delivery sequence
Paper jam detection
Removal and replacement
Chapter contents
Introduction
Caution regarding electrostatic discharge (ESD)
Removal and replacement strategy
Repair notices
Required tools
Types of screws
Supplies
Print cartridges and transfer unit
Covers
Front door removal
Left cover removal
Left front cover removal
Right cover removal
Top cover removal
Upper rear door removal
Lower rear door (rear output bin) removal
Rear cover removal
Tray 1 (multipurpose) removal
Main Assemblies
Transfer unit removal
Print cartridge removal
Fuser removal
Face-down delivery assembly removal
Laser/scanner assembly removal
Image drive assembly removal
Developing engaging drive assembly removal
Pick-up/feed assembly removal
Main assembly parts
Tray 1 pick-up roller removal
Tray 1 separation pad removal
Tray 2 pick-up roller removal
Tray 2 separation pad removal
Fuser sleeve unit removal
Main thermistor/sub-thermistor removal
Pressure roller removal
Secondary transfer charging roller removal
Thermoswitch removal
Feed guide unit removal
Swing guide removal, right
Swing guide removal, left
Switches
Door Switch (SW1) removal
Power switch (SW3001) removal
Test print switch (SW1001) removal
Sensors
Tray 1 (multipurpose tray) paper sensor (PS1) removal
Tray 2 (cassette) paper sensor (PS2) removal
Registration paper sensor (PS4) removal
Media sensor (PS5) removal
Fuser delivery paper sensor (PS7) removal
Fuser front paper sensor (PS6) removal
Face-down delivery paper sensor (PS8) removal
Reversed paper sensor (PS9) removal (HP 3700 only)
Duplex feed delivery paper sensor (PS10) removal (HP 3700 only)
Rear output bin paper sensor (PS11) removal
Color misregistration sensor (PS12) removal
Waste toner level sensor (PS13) removal
Developing engaging sensor (PS14) removal
Environment sensor (PS15) removal
Secondary transfer roller engaging sensor (PS16) removal
Solenoids and Clutches
Tray 1 (multipurpose tray) pick-up solenoid (SL1) removal
Tray 2 pick-up solenoid (SL2) removal
Secondary transfer roller engaging solenoid (SL4) removal
Duplex feed solenoid (SL5) removal (HP 3700 only)
Registration clutch (CL1) removal
Black (K) development clutch (CL2 - image drive) removal
Developing engaging drive clutch (CL3) removal
Motor and fans
Feed motor (M1) removal
Delivery motor (M2) removal
Drum motor (M3) removal
Developing motor (M4) removal
Primary transfer roller engaging motor (M5) removal
Exhaust fan (FAN1) removal
Circuit Boards
DC controller PCB removal
Formatter PCB removal
High-voltage power supply PCB removal
Low-voltage power supply PCB removal
Memory controller PCB removal
Control Panel PCB removal
Miscellaneous parts
Developing contact assembly
Swing rod guide, left removal
Swing rod/lock guide, right removal
Transfer contact assembly removal
Tray 2 (cassette) parts removal
Cassette (Tray 2) guide, right, removal
Tray 2 (cassette)
500-Sheet paper feeder (Tray 3) covers
Front cover removal - 500-sheet paper feeder
Left cover removal - 500-sheet paper feeder
Right cover removal - 500-sheet paper feeder
500-Sheet paper feeder internal parts
Pick-up roller removal - 500-sheet paper feeder
Pick-up drive unit removal - 500-sheet paper feeder
Separation pad removal - 500-sheet paper feeder
500-Sheet paper feeder sensor/solenoid/motor/PCB
500-Sheet paper feeder PCB removal - 500-sheet feeder
Pick-up clutch (CL4) removal - 500-sheet feeder
Pick-up solenoid (SL3) removal - 500-sheet feeder
Paper sensor (PS3) removal - 500-sheet feeder
Troubleshooting
Chapter contents
Introduction
Troubleshooting process
Pre-troubleshooting checklist
Troubleshooting flowchart
Troubleshooting power-on
Printer error troubleshooting
Alphabetical printer messages
Critical error messages
Error messages
Status messages
Warning messages
Numerical printer messages
Replacement parts configuration
Formatter (New) replacement configuration
Formatter and DC Controller replaced at the same time
DC Controller (New) replacement configuration
Formatter (previously installed in another printer) replacement configuration
DC Controller (previously installed in another printer) replacement configuration
Media sensor (PS5) replacement configuration
Color Misregistration Sensor (PS12) replacement configuration
Fuser replacement configuration
Laser/scanner Assembly replacement configuration
Transfer unit (ITB assembly) replacement configuration
Paper path troubleshooting
Paper jam error message
Paper path jam areas
Paper path areas jam troubleshooting
Avoiding paper jams
Paper jam recovery feature
General paper path troubleshooting
Persistent jams
Image formation troubleshooting
Overhead transparency defect
Print quality problems associated with media
Print quality problems associated with paper jams
Print quality problems associated with the environment
Print quality problems associated with toner buildup
Calibrating the printer
Print quality troubleshooting pages
Using Color
Color options (available for the HP Color LaserJet 3700 series printer)
HP ImageREt 2400
Paper selection
Standard red-green-blue (sRGB)
CMYK ink set emulation (PostScript only)
Printing in four-colors [CMYK (available for the HP Color LaserJet 3700 series printer)
Managing color
Automatic or manual color adjustment
Manual color options
Print in Grayscale
Matching colors
Swatch book color matching (HP Color LaserJet 3700 series printer only)
Adjusting color balance
Image defects
Light image
Dark image
Light color
All black or solid color
Completely blank image
Dark color
Dirt on back of paper
Dirt on front of paper
Dots in vertical lines
Vertical lines
White vertical lines
Horizontal line
White horizontal line
Blank spots
Color missing
Poor fusing
Color misregistration
Image distortion
Misplaced image
Smearing
Reversed color
Snail tracks
Repetitive defects troubleshooting
Interface troubleshooting
Communications checks
EIO troubleshooting
AUTOEXEC.BAT standard configurations
Printer Job Language (PJL) commands
@PJL COMMENT
@PJL INFO CONFIG
@PJL INFO ID
@PJL INFO PAGECOUNT
@PJL INFO USTATUS
@PJL ECHO
@PJL EOJ
@PJL JOB
@PJL USTATUS JOB=ON/OFF
@PJL USTATUSOFF
Control panel troubleshooting
Information menu
Printing a menu map
Paper handling menu
Configure device menu
Print quality menu
System setup menu
I/O menu
Diagnostics menu
Resets menu
Service menu
Tools for troubleshooting
Embedded Web server (HP Color LaserJet 3700 series printer only)
HP Toolbox
Printer configuration page
Supplies status page
Usage page (HP 3700 only)
Event log
Diagnostics
Diagnostics flowchart
Engine diagnostics
Diagnostics from the Control Panel
Diagnostics test menu
Printer display menu
Component Test – special mode test
Paper Path Test
Print/Stop Test
Configure device menu/print quality menu
Configure device menu/printing menu
Configure device menu/resets menu
Information menu
Test pages
Engine test page
Formatter test page
Engine resets
Cold reset
NVRAM initialization
Calibrate Now
Calibration bypass
Service menu
Accessing the Service menu
Diagrams
Main parts
Switches
Sensors
Solenoids and clutches
Motors and fans
PCBs
Connector locations
500-sheet paper feeder connectors
General circuit diagram
Parts and diagrams
Chapter contents
Introduction
Ordering parts
Supplies and accessories
Replacement parts configuration
Illustrations and parts lists
Alphabetical parts list
Numerical parts list
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