HP m402, m403, m426, m427 Troubleshooting Manual

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Troubleshooting Manual

www.hp.com/support/ljM402 www.hp.com/support/ljM403 www.hp.com/support/ljM426MFP www.hp.com/support/ljM427MFP

For printer theory and troubleshooting information, see the Repair Manual.

HEWLETT-PAC

KARD

M402d M402n M402dn M402dw M403n M403d M403dn M403dw

M426dw M426fdn M426fdw M427dw M427fdn M427fdw

LaserJet Pro MFP M426, M427

LaserJet Pro M402, M403

HP LaserJet Pro M402, M403 and HP LaserJet Pro MFP M426, M427

Troubleshooting Manual

Trademark Credits

Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws.

The information contained herein is subject to change without notice.

The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.

Edition 1, 9/2015

Microsoft®, Windows®, Windows® XP, and Windows Vista® are U.S. registered trademarks of Microsoft Corporation.

Conventions used in this guide

TIP: Helpful hints or shortcuts.

Reinstallation tip: Reinstallation helpful hints, shortcuts, or considerations.

NOTE: Information that explains a concept or how to complete a task.

IMPORTANT: Information that help the user to avoid potential printer error conditions.

CAUTION: Procedures that the user must follow to avoid losing data or damaging the printer.

WARNING! Procedures that the user must follow to avoid personal injury, catastrophic loss of data, or

extensive damage to the printer.

ENWW iii

iv Conventions used in this guide ENWW

For additional service and support information

HP service personnel, go to the Service Access Work Bench (SAW) at http://h41302.www4.hp.com/km/saw/

home.do.

Channel partners, go to HP Channel Services Network (CNS) at https://h30125.www3.hp.com/hpcsn.

At these locations, nd information on the following topics:

●

Install and congure

●

Printer specications

●

Up-to-date control panel message (CPMD) troubleshooting

●

Solutions for printer issues and emerging issues

●

Remove and replace part instructions and videos

●

Service advisories

●

Warranty and regulatory information

To access HP PartSurfer information from any mobile device, go to http://partsurfermobile.hp.com/ or scan the Quick Response (QR) code below.

ENWW v

vi For additional service and support information ENWW

Table of contents

1 Theory of operation ....................................................................................................................................... 1

Related documentation and software ................................................................................................................... 2

Basic operation ...................................................................................................................................................... 3

Sequence of operation ........................................................................................................................ 4

Engine-control system .......................................................................................................................................... 5

DC controller ........................................................................................................................................ 6

Motor control ..................................................................................................................... 8

Fan control ........................................................................................................................ 8

Low-voltage power supply .................................................................................................................. 9

Over-current/over-voltage protection ........................................................................... 10

Safety ............................................................................................................ 10

Low-voltage power supply functions ........................................................... 10

High-voltage power supply ............................................................................................................... 11

High-voltage power supply circuits ................................................................................ 12

Fuser bias ........................................................................................................................ 12

Fuser control ..................................................................................................................................... 12

Fuser circuits ................................................................................................................... 13

Fuser control functions ................................................................................................... 14

Fuser heater protection .................................................................................................. 15

Engine laser/scanner system .............................................................................................................................. 16

Laser/scanner failure detection ........................................................................................................ 17

Safety ................................................................................................................................................ 17

Image-formation process ................................................................................................................. 18

Step 1: Primary charging ................................................................................................ 21

Step 2: Laser-beam exposure ......................................................................................... 22

Step 3: Development ...................................................................................................... 22

Step 4: Transfer ............................................................................................................... 23

Step 5: Separation ........................................................................................................... 24

Step 6: Fusing .................................................................................................................. 24

Step 7: Drum cleaning ..................................................................................................... 24

Toner cartridges ................................................................................................................................ 25

Design ............................................................................................................................. 25

ENWW vii

Memory chip .................................................................................................................... 27

Toner level and cartridge life detection .......................................................................... 27

Pickup, feed, and delivery system ....................................................................................................................... 27

Sensors and switches ........................................................................................................................ 29

Motors, clutches, and solenoids ........................................................................................................ 31

Jam detection/prevention ................................................................................................................. 31

Paper feeder (optional Tray 3) ............................................................................................................................. 35

Basic operation .................................................................................................................................. 35

Paper path ....................................................................................................................... 35

Paper feeder controller ................................................................................................... 35

Motor control .................................................................................................................. 36

Pickup and feed operation ................................................................................................................ 36

Electrical components, pickup and feed ......................................................................... 36

Other functions ............................................................................................................... 37

Jam detection .................................................................................................................. 38

2 Solve problems ............................................................................................................................................ 39

For additional service and support ..................................................................................................................... 40

Solve problems checklist ..................................................................................................................................... 41

Solve problems checklist ................................................................................................................... 41

Print the menu map ........................................................................................................ 42

Print a conguration page .............................................................................................. 42

Print the service page (includes the event log) .............................................................. 43

Print the demo page ....................................................................................................... 43

Troubleshooting process ..................................................................................................................................... 44

Determine the problem source ......................................................................................................... 44

Pre-troubleshooting checklist ........................................................................................ 44

Determine the problem source ....................................................................................... 46

Power subsystem .............................................................................................................................. 47

Power-on checks ............................................................................................................. 47

Control panel checks ......................................................................................................................... 47

Tools for troubleshooting .................................................................................................................................... 49

Component diagnostics .................................................................................................................... 49

LED diagnostics ............................................................................................................... 49

Network LEDs (network models only) ......................................................... 49

Control panel LEDs ....................................................................................... 49

Engine diagnostics .......................................................................................................... 50

Engine test .................................................................................................... 50

Diagrams ........................................................................................................................................... 51

Diagrams: Block diagrams .............................................................................................. 51

Cross-sectional view of printer .................................................................... 51

viii ENWW

Cross-sectional view of 550–sheet paper feeder ........................................ 52

Diagrams: Printed circuit assembly (PCA) connector locations ..................................... 53

Diagrams: DC controller connections ........................................................... 53

Paper feeder controller PCA ......................................................................... 54

Diagrams: External plug and port locations ................................................................... 54

Diagrams: Locations of major components ................................................................... 56

Major components (printer base) ................................................................. 56

Motor and fan ............................................................................................... 57

Rollers and pads (printer base) .................................................................... 58

PCAs (printer base) ....................................................................................... 59

Diagrams: Timing chart .................................................................................................. 60

Diagrams: Circuit diagrams ............................................................................................. 61

Advanced conguration with HP Embedded Web Server (EWS) and HP Device Toolbox

(Windows 7) ....................................................................................................................................... 62

Internal print-quality test pages ....................................................................................................... 64

Clean the paper path ....................................................................................................... 64

Clean the paper path (LCD control panel) .................................................... 64

Clean the paper path (touchscreen control panel) ...................................... 65

Print the conguration page ........................................................................................... 65

Print the conguration page from an LCD control panel ............................. 65

Print the conguration page from a touchscreen control panel ................. 65

Print-quality troubleshooting tools .................................................................................................. 66

Repetitive image defect ruler ......................................................................................... 66

Use a ruler to measure between repetitive defects ..................................... 66

Control panel menus ......................................................................................................................... 70

HP Web Services menu ................................................................................................... 70

Reports menu ................................................................................................................. 70

Quick Forms menu .......................................................................................................... 71

USB Flash Drive menu ..................................................................................................... 71

System Setup menu ........................................................................................................ 72

Service menu ................................................................................................................... 74

Network Setup menu ...................................................................................................... 77

Control panel message document (CPMD) ....................................................................................... 79

Control-panel message types ........................................................................................ 79

Control-panel messages and event log entries ............................................................. 79

30.XX Error Messages ................................................................................... 79

49.XX.YY Error Messages ............................................................................. 80

50.XX fuser errors ........................................................................................ 80

51.XX and 52 Laser/Scanner Errors ............................................................. 81

55.XXXX Error Messages .............................................................................. 82

57.XX Error Messages ................................................................................... 83

ENWW ix

58.XX Error Messages ................................................................................... 83

59.XX Error Messages ................................................................................... 84

79 Errors ....................................................................................................... 85

Alpha Error Messages ................................................................................... 85

Event-log messages .......................................................................................................................... 96

Print the event log .......................................................................................................... 96

Print the event log (LCD control panel) ........................................................ 96

Print the event log (touchscreen control panel) .......................................... 97

Show an event log ........................................................................................................... 97

Event-log messages ....................................................................................................... 97

Clear paper jams ................................................................................................................................................ 101

Clear paper jams (M402, M403) ...................................................................................................... 101

Introduction .................................................................................................................. 101

Experiencing frequent or recurring paper jams? ......................................................... 101

Jam locations ................................................................................................................ 102

Clear paper jams in Tray 1 ............................................................................................ 103

Clear paper jams in Tray 2 ............................................................................................ 104

Clear paper jams in optional Tray 3 .............................................................................. 108

Clear paper jams in the fuser ........................................................................................ 111

Clear paper jams in the output bin ............................................................................... 115

Clear paper jams in the duplexer .................................................................................. 117

Clear paper jams (M426, M427) ...................................................................................................... 119

Introduction .................................................................................................................. 119

Experiencing frequent or recurring paper jams? ......................................................... 119

Jam locations ................................................................................................................ 120

Clear paper jams in the document feeder .................................................................... 122

Clear paper jams in Tray 1 ............................................................................................ 125

Clear paper jams in Tray 2 ............................................................................................ 126

Clear paper jams in optional Tray 3 .............................................................................. 130

Clear paper jams in the fuser ........................................................................................ 134

Clear paper jams in the output bin ............................................................................... 137

Clear paper jams in the duplexer .................................................................................. 140

Solve paper-handling problems ........................................................................................................................ 142

The printer picks up multiple sheets of paper ................................................................................ 142

The printer does not pick up paper ................................................................................................. 142

Solve image quality problems ........................................................................................................................... 143

Print quality examples .................................................................................................................... 143

Clean the printer ................................................................................................................................................ 150

Clean the pickup and separation rollers ......................................................................................... 150

Clean the paper path ....................................................................................................................... 150

Clean the paper path (LCD control panel) ..................................................................... 150

x ENWW

Clean the paper path (touchscreen control panel) ....................................................... 150

Clean the touchscreen ..................................................................................................................... 150

Solve performance problems ............................................................................................................................ 152

Factors aecting print performance ............................................................................................... 152

Print speeds .................................................................................................................. 152

The product does not print or it prints slowly ................................................................................ 153

The product does not print ........................................................................................... 153

The product prints slowly ............................................................................................. 154

Solve connectivity problems ............................................................................................................................. 155

Solve direct-connect problems ....................................................................................................... 155

Solve network problems ................................................................................................................. 155

Poor physical connection .............................................................................................. 155

The computer is using the incorrect IP address for the product .................................. 155

The computer is unable to communicate with the product ......................................... 156

The product is using incorrect link and duplex settings for the network .................... 156

New software programs might be causing compatibility problems ........................... 156

The computer or workstation might be set up incorrectly .......................................... 156

The product is disabled, or other network settings are incorrect ............................... 156

Solve wireless network problems ................................................................................................... 157

Wireless connectivity checklist ..................................................................................... 157

The control panel displays the message: The wireless feature on this product has

been turned o ............................................................................................................. 157

The product does not print after the wireless conguration completes ..................... 158

The product does not print, and the computer has a third-party rewall installed ... 158

The wireless connection does not work after moving the wireless router or

product .......................................................................................................................... 158

Cannot connect more computers to the wireless product ........................................... 158

The wireless product loses communication when connected to a VPN ...................... 159

The network does not appear in the wireless networks list ........................................ 159

The wireless network is not functioning ...................................................................... 159

Service mode functions ..................................................................................................................................... 160

Service menu ................................................................................................................................... 160

Service menu settings .................................................................................................. 160

Restore the factory-set defaults .................................................................................. 160

Restore the factory-set defaults (LCD control panel) ................................ 160

Restore the factory-set defaults (touchscreen control panel) .................. 161

Secondary service menu ................................................................................................................. 161

Open the secondary service menu ............................................................................... 161

Open the secondary service menu (LCD control panel) ............................. 161

Open the secondary service menu (touchscreen control panel) ............... 161

Secondary service menu structure ............................................................................... 162

ENWW xi

Developer's menu ............................................................................................................................ 162

Open the Developer's menu (LCD control panel) ......................................................... 162

Open the Developer's menu (touchscreen control panel) ........................................... 163

Product resets ................................................................................................................................. 164

NVRAM initialization ..................................................................................................... 164

Solve fax problems (fax models only) ............................................................................................................... 165

Introduction ..................................................................................................................................... 165

Fax troubleshooting checklist ......................................................................................................... 165

Solve general fax problems ............................................................................................................ 166

Faxes are sending slowly .............................................................................................. 166

Fax quality is poor ......................................................................................................... 167

Fax cuts o or prints on two pages .............................................................................. 168

Solve email problems (M426, M427 printes) .................................................................................................... 169

Cannot connect to the email server ................................................................................................ 169

Validate the SMTP gateway (Windows) .......................................................................................... 169

Validate the LDAP gateway (Windows) ........................................................................................... 169

Manually update the rmware .......................................................................................................................... 170

Manually update the rmware (LCD control panel) ........................................................................ 170

Manually update the rmware (touchscreen control panel) .......................................................... 170

Appendix A Printer specications .................................................................................................................. 171

Printer dimensions M426 and M427 ................................................................................................................. 172

Printer dimensions M402 and M403 ................................................................................................................. 174

Printer space requirements ............................................................................................................................... 176

Power consumption, electrical specications, and acoustic emissions ........................................................... 176

Operating-environment range .......................................................................................................................... 176

Certicate of Volatility ....................................................................................................................................... 177

Index ........................................................................................................................................................... 181

xii ENWW

List of tables

Table 1-1 Sequence of operation .......................................................................................................................................... 4

Table 1-2 Motors ................................................................................................................................................................... 8

Table 1-3 Fans ....................................................................................................................................................................... 8

Table 1-4 List of DC voltages ................................................................................................................................................ 9

Table 1-5 Low-voltage power supply functions ................................................................................................................. 10

Table 1-6 High-voltage power supply circuits .................................................................................................................... 12

Table 1-7 Fuser components .............................................................................................................................................. 13

Table 1-8 Fuser control functions ...................................................................................................................................... 14

Table 1-9 Sensors ............................................................................................................................................................... 20

Table 1-10 Image formation process ................................................................................................................................. 21

Table 1-11 Toner cartridge functions ................................................................................................................................. 26

Table 1-12 Pickup, feed, and delivery system functions ................................................................................................... 28

Table 1-13 Photo sensors and switches ............................................................................................................................. 30

Table 1-14 Motors, solenoids, and clutches ....................................................................................................................... 31

Table 1-15 Jams that the printer detects ........................................................................................................................... 32

Table 1-16 Electrical component list, paper feeder ........................................................................................................... 36

Table 1-17 Motors, paper feeder ........................................................................................................................................ 36

Table 1-18 Electrical components, pickup and feed .......................................................................................................... 37

Table 1-19 Other functions, paper feeder .......................................................................................................................... 37

Table 2-1 DC controller connectors .................................................................................................................................... 53

Table 2-2 Paper feeder controller PCA connectors ............................................................................................................ 54

Table 2-3 M402, M403 external plugs and ports ............................................................................................................... 54

Table 2-4 M426, M427 external plugs and ports ............................................................................................................... 55

Table 2-5 Major components (printer base) ....................................................................................................................... 56

Table 2-6 Motor and fan (printer base) .............................................................................................................................. 57

Table 2-7 Rollers and pads (printer base) .......................................................................................................................... 58

Table 2-8 Main PCAs (printer base) ..................................................................................................................................... 59

Table 2-9 Repetitive defects ............................................................................................................................................... 66

Table 2-10 Event-log messages (X=0: black cartridge) ..................................................................................................... 97

Table 2-11 Fax event log codes ........................................................................................................................................ 100

Table 2-12 Print quality examples ................................................................................................................................... 143

Table 2-13 Secondary Service menu ................................................................................................................................ 162

ENWW xiii

Table A-1 Operating-environment specications ............................................................................................................ 176

xiv ENWW

List of gures

Figure 1-1 Relationship between the main printer systems ............................................................................................... 3

Figure 1-2 Engine-control system ........................................................................................................................................ 5

Figure 1-3 DC controller block diagram ................................................................................................................................ 6

Figure 1-4 Low-voltage power-supply circuit ...................................................................................................................... 9

Figure 1-5 High-voltage power supply circuits .................................................................................................................. 12

Figure 1-6 Fuser components ............................................................................................................................................ 13

Figure 1-7 Fuser control ..................................................................................................................................................... 14

Figure 1-8 Laser/scanner system ....................................................................................................................................... 16

Figure 1-9 Image-formation system .................................................................................................................................. 18

Figure 1-10 Fuser motor (M1) and image formation components .................................................................................... 19

Figure 1-11 Toner-level sensor .......................................................................................................................................... 20

Figure 1-12 Image-formation process ............................................................................................................................... 20

Figure 1-13 Primary charging ............................................................................................................................................. 21

Figure 1-14 Laser-beam exposure ..................................................................................................................................... 22

Figure 1-15 Development ................................................................................................................................................... 22

Figure 1-16 Primary transfer .............................................................................................................................................. 23

Figure 1-17 Separation ....................................................................................................................................................... 24

Figure 1-18 Fusing .............................................................................................................................................................. 24

Figure 1-19 Drum cleaning ................................................................................................................................................. 25

Figure 1-20 Toner cartridge system ................................................................................................................................... 26

Figure 1-21 Pickup, feed, and delivery system .................................................................................................................. 28

Figure 1-22 Sensors and switches for the pickup, feed, and delivery system .................................................................. 29

Figure 1-23 Motors, solenoids, and clutches ..................................................................................................................... 31

Figure 1-24 Jam detection sensors .................................................................................................................................... 32

Figure 1-25 Optional Tray 3 paper path ............................................................................................................................. 35

Figure 1-26 Paper feeder controller ................................................................................................................................... 36

Figure 1-27 Electrical components, pickup and feed ......................................................................................................... 37

Figure 2-1 Cross-sectional view of printer ......................................................................................................................... 51

Figure 2-2 Cross-sectional view of 500–sheet paper feeder ............................................................................................ 52

Figure 2-3 DC controller PCA connectors ........................................................................................................................... 53

Figure 2-4 Paper feeder controller PCA connectors ........................................................................................................... 54

Figure 2-5 M402, M403 external plugs and ports locations .............................................................................................. 54

ENWW xv

Figure 2-6 M426, M427 external plug and port locations ................................................................................................. 55

Figure 2-7 Major components (printer base) ..................................................................................................................... 56

Figure 2-8 Motor and fan .................................................................................................................................................... 57

Figure 2-9 Rollers and pads (printer base) ......................................................................................................................... 58

Figure 2-10 Main PCAs (printer base) ................................................................................................................................. 59

Figure 2-11 General timing chart ....................................................................................................................................... 60

Figure 2-12 General circuit diagram (printer base) ............................................................................................................ 61

Figure 2-13 Examples of repetitive defects ....................................................................................................................... 67

Figure 2-14 Place the ruler on the page ............................................................................................................................. 68

Figure 2-15 Locate the next repetitive defect ................................................................................................................... 68

Figure 2-16 Determine the defective assembly ................................................................................................................. 69

Figure A-1 Dimensions for the M426 and M427 models ................................................................................................. 172

Figure A-2 Dimensions for the optional 550-sheet tray .................................................................................................. 172

Figure A-3 Dimensions for the printer with the optional 550-sheet tray ....................................................................... 173

Figure A-4 Dimensions for the M402 and M403 models ................................................................................................. 174

Figure A-5 Dimensions for the optional 550-sheet tray .................................................................................................. 174

Figure A-6 Dimensions for the printer with the optional 550-sheet tray ....................................................................... 175

Figure A-7 Certicate of Volatility M402/M403 (1 of 2) ................................................................................................... 177

Figure A-8 Certicate of Volatility M402/M403 (2 of 2) ................................................................................................... 178

Figure A-9 Certicate of Volatility M426/M427 (1 of 2) ................................................................................................... 179

Figure A-10 Certicate of Volatility M426/M427 (2 of 2) ................................................................................................ 180

xvi ENWW

1 Theory of operation

●

Basic operation

Engine-control system

Laser scanner system

Image-formation system

Pickup, feed, and delivery system

Accessory

Engine-control system

Laser scanner system

Image-formation system

Pickup, feed, and delivery system

Accessor

The printer routes all high-level processes through the formatter, which stores font information, processes the print image, and communicates with the host computer.

The basic printer operation comprises the following systems:

●

Engine-control system

●

Laser/scanner system

●

Image-formation system

●

Pickup, feed, and delivery system

●

Accessory (optional paper feeder)

Figure 1-1 Relationship between the main printer systems

ENWW Basic operation 3

Sequence of operation

The DC controller PCA controls the operating sequence, as described in the following table.

Table 1-1 Sequence of operation

Period Duration Description

Waiting From the time the power is turned on, the door is

closed, or when the printer exits Sleep mode until the printer is ready for printing.

Standby From the end of the waiting sequence or the last

rotation until the formatter receives a print command, or until the printer is turned o.

Initial rotation From the time the formatter receives a print command

until the paper enters the paper path.

Printing From the time the rst sheet of paper enters the paper

path until the last sheet passes through the fuser.

●

Heats the fuser lm in the fuser

●

Detects the toner cartridge

●

Rotates and stops each motor

●

Rotates and stops each fan

●

Cleans the transfer roller

●

Is in the Ready state

●

Enters Sleep mode if the formatter sends the sleep command

●

Rotates and stops each fan

●

Rotates each motor

●

Rotates each fan

●

Activates the high-voltage power supply (highvoltage bias)

●

Prepares the laser/scanner unit

●

Warms the fuser to the correct temperature

●

Forms the image on the photosensitive drums

●

Transfers the toner to the paper

Last rotation From the time the last sheet of paper exits the fuser

until the motors stop rotating.

●

Fuses the toner image onto the paper

●

Stops each motor

●

Stops each fan

●

Stops the high-voltage power supply (highvoltage bias)

●

Stops the laser/scanner unit

●

Turns the fuser heater o

●

If another print command is received, the printer enters the initial rotation period when the last rotation is complete.

4 Chapter 1 Theory of operation ENWW

Engine-control system

Formatter

Engine-control system

DC controller

Low-voltage power supply

Laser scanner system

Image-formation system

Pickup, feed, and delivery

system

Accessory

High-voltage power supplies

Fuser power supply

Formatter

Engine-control system

DC controller

Low-voltage power suppl

Laser scanner system

Image-formation system

Pickup, feed, and delivery

stem

Accessor

igh-voltage power supplies

Fuser power suppl

The engine-control system receives commands from the formatter and interacts with the other main systems to coordinate all printer functions. The engine-control system consists of the following components:

●

DC controller

●

Low-voltage power supply

●

High-voltage power supplies

●

Fuser power supply

Figure 1-2 Engine-control system

ENWW Engine-control system 5

DC controller

Transfer roller

High-voltage

power supply

Fan

Cartridge

LED

Motor

Clutch

Solenoid

Switch

Photointerrupter

Formatter

Control panel

Accessory

Laser scanner ass’y

Fuser

AC input

Low-voltage

power supply

DC controller

Switch

Sensor

The DC controller controls the operation of the printer and its components. The DC controller starts the printer operation when the printer power is turned on and the power supply sends DC voltage to the DC controller. After the printer enters the standby period, the DC controller sends out various signals to operate motors, solenoids, and other printer components based on the print command and image data that the host computer sends.

Figure 1-3 DC controller block diagram

Component type Abbreviation Description

Motor M1 Fuse motor

M3 Scanner motor

Fan Fm1 Main fan

6 Chapter 1 Theory of operation ENWW

Component type Abbreviation Description

Solenoid SL1 Cassette pickup solenoid

SL2 MP tray pickup solenoid

SL3 Duplex switchback solenoid

Clutch CL1 Duplex re-pickup clutch

Switch SW1 Power switch

SW101 Cartridge door switch

Photointerrupter PS1a Media width sensor

PS2b Duplex feed sensor

PS1 Cassette media out sensor

PS2 Top sensor

PS3 MP tray media out sensor

PS4 Output bin media-full sensor

PS13 Fuser output sensor

Sensor TH1 Environment sensor

LED LED1 Power supply LED

Duplex models only.

ENWW Engine-control system 7

Motor control

The printer has two motors. The motors drive the components in the paper-feed and image-formation systems.

The DC controller monitors the fuser motor and the scanner motor to determine if a motor has failed. It noties the formatter when it encounters the following conditions:

●

Table 1-2 Motors

Abbreviation Name Purpose Failure detection

Startup failure: the motor does not reach a specied speed within a specied time from when the motor starts.

Rotational failure: the rotational speed of the motor is not in the specied range for a specied time after the motor reaches a specied speed.

Fan control

The printer has one fan for preventing the temperature from rising in the printer and for cooling the printed pages.

The DC controller determines if there is a fan failure and noties the formatter if the fan locks for a specied time from when the fan starts.

Table

M1 Fuser motor Drives the pressure roller and delivery roller;

the pressurization and release of the pressure roller; and the engagement and disengagement of the primary and secondary transfer rollers

M3 Scanner motor Drives the scanner mirror Yes

1-3 Fans

Abbreviation Name Cooling area Type Speed

FM1 Main fan Inside of printer Intake Full

Yes

8 Chapter 1 Theory of operation ENWW

Low-voltage power supply

AC input

+24VA

FET

+24VB

+24VC

+24VD

+24VBSNS

+24VA

FET

PWRSW

+3.3VA

FET

+3.3VC

+3.3VB

+3.3VA

+24VA

Low-voltage power supply

Rectifying

circuit

Protection

circuit

+24V

generation

circuit

Fuse

FU101

Fuse

FU102

+3.3V

generation

circuit

Fuser

Power switch

SW1

DC controller

High-voltage power supply

Interlock switch

SW101

Fuser control

circuit

FREQSNS_LVT

Frequency

detection circuit

The low-voltage power-supply (LVPS) circuit converts the AC power from the wall receptacle into the DC voltage that the printer components use.

Figure 1-4 Low-voltage power-supply circuit

Table 1-4 List of DC voltages

DC power supply Description

+24V +24VA Constantly supplied

Becomes 4.5V during active OFF or inactive OFF

ENWW Engine-control system 9

Table 1-4 List of DC voltages (continued)

DC power supply Description

+3.3V +3.3VA Constantly supplied

Over-current/over-voltage protection

The low-voltage power supply has a protective function against overcurrent and overvoltage conditions to prevent failures in the power supply circuit. If an overcurrent or overvoltage event occurs, the system automatically cuts o the output voltage.

+24VB Stopped when cartridge door is opened. (SW101)

Stopped during active OFF or inactive OFF

+24VC Stopped when cartridge door is opened. (SW101)

Stopped during active OFF or inactive OFF

+24VD Constantly supplied

Stopped during active OFF or inactive OFF

+3.3VB Constantly supplied

Stopped during active OFF or inactive OFF

+3.3VC Constantly supplied

Stopped during inactive OFF

If the DC power is not being supplied from the low-voltage power supply, the protective function might have activated. In this case, turn o the power switch, and then unplug the power cord. Do not plug in the power cord or turn the power switch on again until the root cause is found.

In addition, two fuses in the low-voltage power supply protect against an overcurrent event. If an overcurrent event occurs in the AC line, the fuse blows and cuts o the power distribution.

Safety

For personal safety, the printer interrupts +24VB and +24VC power when the cartridge door detection switch is turned o. This stops DC power supply to the high-voltage power supply (HVPS).

The remote switch control circuit turns on or o the printer power so that the AC power ows even the power switch is turned o. Unplug the printer power cord before disassembling the printer.

Low-voltage power supply functions

The printer has the following low-voltage power supply functions.

1-5 Low-voltage power supply functions

Table

Failure detective function Applied

Sleep mode NA

Power supply voltage detection NA

Automatic power OFF NA

Automatic power ON/OFF NA

10 Chapter 1 Theory of operation ENWW

Table 1-5 Low-voltage power supply functions (continued)

Failure detective function Applied

Active OFF Yes

Inactive OFF Yes

Network mode NA

Power switch illumination Yes

Low-voltage power supply failure detection Yes

Power save mode NA

High-voltage power supply

The DC controller controls the high-voltage power supply (HVPS) to generate biases. The high-voltage power supply delivers the high-voltage biases to the following components used to transfer toner during the imageformation process:

●

Primary charging roller (in the toner cartridge)

●

Developing roller (in the toner cartridge)

●

Transfer roller

●

Pressure roller

ENWW Engine-control system 11

High-voltage power supply circuits

PRI

DEV

DC controller

High-voltage power supply

To primary charge roller

To developing roller

Cartridge

Photosensitive drum

Transfer roller

Primary

charging bias

circuit

Developing

bias circuit

Transfer bias

circuit

The high-voltage power supply contains the following separate circuits.

Figure 1-5 High-voltage power supply circuits

Fuser bias

Fuser control

Table 1-6 High-voltage power supply circuits

Circuit Description

Primary-charging-bias generation The primary charging bias negatively charges the surface of the photosensitive drum to

prepare for image formation.

Developing-bias generation The developing bias adheres toner to an electrostatic latent image formed on the

photosensitive drums.

Transfer-bias generation The primary transfer bias transfers the toner from each photosensitive drum onto the

page.

The printer uses on-demand fusing. The fuser bias is DC positive for improved print quality. The fuser bias circuit is located in the high-voltage power supply, HVPS (T).

The DC controller and components in the fuser perform the following functions related to fuser operation:

●

Control fuser temperature

●

Detect fuser failures

●

Prevent excessive temperature rise

12 Chapter 1 Theory of operation ENWW

●

FUSER TEMPERATURE signal

FUSER HEATER CONTROL signal

DC controller

Low-voltage power supply

Fuser control circuit

TH1

TP1

Pressure roller

Fuser film

Fuser heater

control circuit

Fuser heater safety circuit

●

Fuser circuits

The fuser heater control circuit and the fuser heater safety circuit control the fuser temperature according to commands from the DC controller. The fuser consists of the following major components:

Figure 1-6 Fuser components

Detect remaining life in the fuser

Determine if the correct fuser is installed

ENWW Engine-control system 13

Table 1-7 Fuser components

Type of component Abbreviation Name Function

Heaters H1 Fuser main heater Heats the center of the fuser lm

Thermistors

(Contact type)

Thermoswitch

(Contact type)

TH1 Main thermistor Detects the center temperature of

TP1 Thermoswitch Prevents an abnormal temperature

assembly

the fuser heater

rise in the fuser heater

Fuser control functions

Fuser heater

safety circuit

FREQSNS

TP1

Fuser heater (H1)

Fuser film ass’y

TP1: Thermal switch TH1: Thermistor

Fuser

Pressure roller

FSRD

RLYD

FSRTH

+24V

Low-voltage suppry supply

Fuser control

RL101

DC controlle

Fuser heater control circuit

Relay control

circuit

Current detection

circuit

TH1

Figure 1-7 Fuser control

The printer has the following fuser control functions.

1-8 Fuser control functions

Table

Failure detection function Supported feature

Fuser temperature control Yes

14 Chapter 1 Theory of operation ENWW

Table 1-8 Fuser control functions (continued)

Failure detection function Supported feature

Fuser failure detection Yes

Frequency detection circuit failure detection Yes

Fuser pressure release mechanism failure detection No

Fuser type discrepancy detection No

Fuser type identication detection Yes

Fuser presence detection No

Fuser life detection No

Relay failure detection No

Pressure roller cleaning Yes

Fuser heater protection

Fuser heater protection is a feature that detects excessive temperatures in the fuser and interrupts the power supply to the fuser heater.

The following three protective components prevent the fuser heater from excessive rising temperature:

●

DC controller: When a thermistor or sub-thermistor detects a temperature above a certain threshold, the DC controller interrupts power to the specic heater.

●

Fuser-heater safety circuit: The fuser heater safety circuit monitors the detected temperature of the sub thermistors.

●

Thermoswitch: If the temperature in the heaters is abnormally high, and the temperature in the thermoswitch exceeds a specied value, the contact to the thermoswitch breaks.

ENWW Engine-control system 15

Engine laser/scanner system

Laser ass’y

BD sensor

Scanner mirror

Scanner motor ass’y

Photosensitive drum

DC controller

The laser/scanner system forms the latent electrostatic image on the photosensitive drums inside each of the toner cartridges.

The DC controller receives instructions from the formatter regarding the image of the page to be printed. The DC controller signals the lasers to emit light, and the laser beams pass through lenses and onto the scanner mirror, which rotates at a constant speed. The mirror reects the beam onto the photosensitive drum in the pattern required for the image, exposing the surface of the drum so it can receive toner.

The main components of the laser/scanner system, which are controlled by signals sent from the DC controller, are:

●

Laser assembly

●

Scanner motor assembly

●

Beam detect (BD) sensor

●

Scanner mirror

Figure 1-8 Laser/scanner system

16 Chapter 1 Theory of operation ENWW

Laser/scanner failure detection

The DC controller determines an optical unit failure and noties the formatter of the error status for the following supported conditions:

Failure detection function Supported feature

Safety

Beam detect (BD) failure detection: A specied BD interval is not detected within a

specied period during the scanner motor drive.

Laser/scanner motor startup failure: The scanner motor does not reach a specied rotation frequency within a specied period of time from when the laser/scanner starts up.

Laser/scanner motor abnormal rotation: The laser/scanner motor does not reach a specied rotational frequency within a specied period of time during a print operation.

Laser scanner failure detection A specied laser intensity is not detected. No

Yes

The laser/scanner assembly has a mechanical laser shutter. For the safety of users and service technicians, the laser shutter interrupts the optical path of the laser/scanner assembly when the top door is opened (SW101).

ENWW Engine laser/scanner system 17

Image-formation process

The image-formation system creates the printed image on the paper. The system consists of the following components:

●

Toner cartridge

●

Transfer roller

●

Fuser

●

Laser/scanner

●

High-voltage power supply

The DC Controller controls the internal components of the image formation system (according to commands received from the formatter) to form the toner image on the photosensitive drum surface. The toner image is then transferred to the print media and fused.

Figure 1-9 Image-formation system

The fuser motor (M1) drives the following image formation components:

●

Photosensitive drum

●

Developing roller

●

Primary charging roller (follows the photosensitive drum)

●

Transfer roller (follows the photosensitive drum)

●

Pressure roller

●

Fuser lm (follows the pressure roller)

NOTE: The primary charging roller and developer roller are located in the toner cartridge.

18 Chapter 1 Theory of operation ENWW

Figure 1-10 Fuser motor (M1) and image formation components

DC controller

Abbreviation Component

M1 Fuser motor

The following gure shows the toner-level sensor for the image-formation system.

ENWW Engine laser/scanner system 19

Figure 1-11 Toner-level sensor

DC controller

Toner level sensor

: Paper path

: Direction of drum rotation

: Functional block

: Step

Pickup

Delivery

Fusing

Transfer

Drum cleaning

Developing

Latent image formation

6. Fusing

5. Separation

7. Drum cleaning

1. Primary charging

2. Laser beam exposure

4. Transfer

3. Developing

Table 1-9 Sensors

Abbreviation Component Replacement part number

The image-formation process consists of ten steps divided into ve functional blocks.

Figure 1-12 Image-formation process

Toner-level sensor

20 Chapter 1 Theory of operation ENWW

Table 1-10 Image formation process

Photosensitive drum

Primary charging roller

Primary charging bias

Functional block Steps Description

Latent image formation 1. Primary charging

Development 3. Development Toner adheres to the electrostatic latent image on the

Transfer 4. Transfer

Fusing 6. Fusing The toner fuses to the paper to make a permanent

Drum cleaning 7. Drum cleaning Residual toner is removed from the drum.

Step 1: Primary charging

To prepare for latent image formation, the surface of the photosensitive drum is charged with a uniform negative charge. The primary charging roller receives the primary charging bias, and then the roller charges the drum directly.

Figure 1-13 Primary charging

An invisible latent image forms on the surface of the photosensitive drums.

2. Laser-beam exposure

photosensitive drum.

The toner image transfers to the paper.

5. Separation

image.

ENWW Engine laser/scanner system 21

Step 2: Laser-beam exposure

Photosensitive drum

Laser beam

Developer roller

Developing bias

Photosensitive drum

Developer blade

The laser beam scans the photosensitive drum to neutralize the negative charge on portions of the drum surface. An electrostatic latent image forms where the negative charge was neutralized.

Figure 1-14 Laser-beam exposure

Step 3: Development

Toner acquires a negative charge as a result of the friction from the developing roller rotating against the developing blade. When the negatively charged toner comes in contact with the drum, it adheres to the electrostatic latent image. When the toner is on the drum, the image becomes visible. The developing bias is applied to the developing roller.

Figure 1-15 Development

22 Chapter 1 Theory of operation ENWW

Step 4: Transfer

Transfer roller

Paper

Transfer bias

Photosensitive

drum

The transfer bias is applied to the transfer roller to give the paper a positive charge. The positively charged paper attracts the negatively charged toner from the photosensitive drum surface.

Figure 1-16 Primary transfer

ENWW Engine laser/scanner system 23

Step 5: Separation

Paper

Transfer roller

Static charge eliminator

Photosensitive

drum

Paper

Fuser film

Fuser heater

Pressure roller

The elasticity of the paper and the curvature of the photosensitive drum cause the paper to separate from the drum surface. The static charge eliminator reduces back side static discharge of the paper for stable paper feeding and image quality.

Figure 1-17 Separation

Step 6: Fusing

The product uses an on-demand fusing method to fuse the toner image onto the media. The toner image is permanently aixed to the print media by the heat and pressure. The fusing bias is applied to the pressure roller to improve image quality.

Figure 1-18 Fusing

Step 7: Drum cleaning

The cleaning blade scrapes the residual toner o the surface of the photosensitive drum and deposits it in the toner collection box. The drum is now clear and ready for the next image-formation process.

24 Chapter 1 Theory of operation ENWW

Figure 1-19 Drum cleaning

Cleaning blade

Residual toner collection box

Photosensitive

drum

Toner cartridges

The printer has one toner cartridge.

Design

The toner cartridge is lled with toner and consists of the following components:

●

Photosensitive drum

●

Developer

●

Primary-charging roller

●

Memory chip

The DC controller rotates the drum motor to drive the photosensitive drum, developing roller, and the primary-charging roller.

ENWW Engine laser/scanner system 25

Figure 1-20 Toner cartridge system

DC controller

Cartridge

E-label

Photosensitive drum

Developer roller

Primary charging

roller

Table 1-11 Toner cartridge functions

Function Supported feature

Toner cartridge presence detection Yes

Toner level detection Yes

Toner cartridge life detection Yes

Toner cartridge mis-installation detection No

Drum discharge No

Transfer cleaning Yes

26 Chapter 1 Theory of operation ENWW

Memory chip

The memory chip is non-volatile memory that stores information about the usage of the toner cartridge and helps protect the customer from counterfeit cartridges. The chip is also used to detect the presence of a cartridge within the printer or when a cartridge is installed in the wrong slot. The printer reads and writes the data in the memory chip.

Toner level and cartridge life detection

Toner level detection: The DC controller detects the remaining toner in a cartridge by the optical detection

method and then noties the formatter of the remaining toner level.

Cartridge life detection: The DC controller detects the cartridge life by monitoring the total operating time or remaining toner level of the toner cartridge. The DC controller determines a cartridge end of life and noties the formatter when total operating time of the cartridge reaches a specied time or the cartridge runs out of toner.

Pickup, feed, and delivery system

The DC controller controls the pickup, feed, and delivery system according to commands from the formatter. The pickup, feed, and delivery system uses a series of rollers to move the paper through the printer.

The pickup, feed, and delivery system consists of the following three functional blocks. The DC controller controls each block to pick up, feed and deliver the paper.

●

Pickup-and-feed-block: Controls the movement of the paper from each pickup source to the fuser inlet

●

Fuser-and-delivery-block: Controls the movement of the paper from the fuser to the delivery destination

●

Duplex block: Controls the movement of the paper from the duplex switchback unit to the duplex repickup unit (duplex models only)

ENWW Pickup, feed, and delivery system 27

Figure 1-21 Pickup, feed, and delivery system

Duplex paper path

Simplex paper path

Duplex block

Pickup-and-feed block

Fuser-and-delivery block

Table 1-12 Pickup, feed, and delivery system functions

Function Supported feature

Cassette media size detection No

Cassette media presence detection Yes

Cassette media level detection No

28 Chapter 1 Theory of operation ENWW

Table 1-12 Pickup, feed, and delivery system functions (continued)

PS1a

PS2a

PS4

PS13

PS2

PS3

PS1

Function Supported feature

Cassette lift-down control No

Cassette multiple-feed prevention mechanism Yes

Multipurpose tray media presence detection Yes

Multipurpose tray media width detection No

Multipurpose tray last-media detection No

Skew-feed prevention mechanism Yes

Loop control No

Media detection No

OHT detection No

Image leading edge positioning Yes

Media length detection Yes

Media width detection Yes

Pressure roller pressure release control No

Output bin media-full detection Yes

Automatic delivery Yes

Duplex switchback control (duplex models only) Yes

Duplex feed control (duplex models only) Yes

Sensors and switches

The following gure shows the sensors and switches for the pickup, feed, and delivery system.

Figure 1-22 Sensors and switches for the pickup, feed, and delivery system

ENWW Pickup, feed, and delivery system 29

Table 1-13 Photo sensors and switches

Abbreviation Component

SR1a Media width sensor

SR2b Duplex feed sensor (duplex models only)

SR1 Cassette media out sensor

SR2 TOP sensor

SR3 Multipurpose tray media out sensor

SR4 Output bin media-full sensor

SR13 Fuser output sensor

30 Chapter 1 Theory of operation ENWW

Motors, clutches, and solenoids

CL1

SL3

SL2

SL1

The following gure shows the motors, clutches, and solenoids for the pickup, feed, and delivery system.

Figure 1-23 Motors, solenoids, and clutches

Table 1-14 Motors, solenoids, and clutches

Abbreviation Component

M1 Fuser motor

SL1 Cassette pickup solenoid

SL2 Multipurpose tray pickup solenoid

SL3 Duplex switchback solenoid (duplex models only)

CL1 Duplex re-pickup clutch (duplex models only)

Jam detection/prevention

The printer uses the following sensors to detect the paper as it moves through the paper path and to report to the DC controller if the paper has jammed.

●

Top of page (TOP) sensor (SR2)

●

Media width sensor (SR1a)

●

Fuser output sensor (SR13)

●

Duplex feed sensor (SR2a)

ENWW Pickup, feed, and delivery system 31

Figure 1-24 Jam detection sensors

PS432

PS13

PS2a

PS2

PS1a

PS11

Duplex paper path

Simplex paper path

The printer determines that a jam has occurred if one of these sensors detects paper at an inappropriate time. The DC controller stops the print operation and noties the formatter.

Table

1-15 Jams that the printer detects

Jam Supported feature

No pick jam 1 Yes

No pick jam 2 Yes

No pick jam 3 Yes

No pick jam 4 No

Pickup stay jam 1 Yes

Pickup stay jam 2 No

Pickup stay jam 3 No

Pickup stay jam 4 No

Fuser delivery delay jam 1 Yes

32 Chapter 1 Theory of operation ENWW

Table 1-15 Jams that the printer detects (continued)

Jam Supported feature

Fuser delivery delay jam 2 No

Fuser delivery delay jam 3 No

Fuser delivery delay jam 4 No

Fuser delivery stay jam 1 Yes

Fuser delivery stay jam 2 No

Fuser delivery stay jam 3 No

Fuser delivery stay jam 4 No

Residual paper jam 1 Yes

Residual paper jam 2 Yes

Residual paper jam 3 No

Residual paper jam 4 No

Door open jam 1 Yes

Door open jam 2 No

Door open jam 3 No

Door open jam 4 No

Fuser wrap jam1 Yes

Fuser wrap jam2 Yes

Fuser wrap jam3 No

Fuser wrap jam4 No

Duplex switchback jam1 No

Duplex switchback jam2 No

Duplex switchback jam3 No

Duplex switchback jam4 No

Duplex re-pickup jam 1 Yes

Duplex re-pickup jam 2 No

Duplex re-pickup jam 3 No

Duplex re-pickup jam 4 No

Delivery delay jam 1 No

Delivery delay jam 2 No

Delivery delay jam 3 No

Delivery delay jam 4 No

Delivery stay jam 1 No

Delivery stay jam 2 No

ENWW Pickup, feed, and delivery system 33

Table 1-15 Jams that the printer detects (continued)

Jam Supported feature

Delivery stay jam 3 No

Delivery stay jam 4 No

Multiple feed jam 1 No

Multiple feed jam 2 No

Multiple feed jam 3 No

Multiple feed jam 4 No

34 Chapter 1 Theory of operation ENWW

Paper feeder (optional Tray 3)

This section describes the paper feeder (optional Tray 3).

Basic operation

The paper feeder is optionally installed at bottom of the printer. It picks up the print media and feeds it to the printer. The paper DC controller controls the operational sequence of the paper feeder.

Paper path

The gure below shows the optional Tray 3 paper path.

Figure 1-25 Optional Tray 3 paper path

Paper feeder controller

The gure below shows the paper feeder controller block diagram. The table in this section describes the paper feeder electrical components.

ENWW Paper feeder (optional Tray 3) 35

Figure 1-26 Paper feeder controller

DC controller

Paper feeder controller

Motor

550-sheet paper feeder

+24VD

+3.3VB

Solenoid

Clutch

Switch

Photointerruptor

Table 1-16 Electrical component list, paper feeder

Component type Abbreviation Component name

Motor M5 Lifter motor

Solenoid SL4 Cassette pickup solenoid

Clutch CL2 Feed clutch (Note)

Switch SW3 Cassette detection switch

Photointerrupter PS460 Media surface sensor

PS461 Cassette media out sensor

Motor control

The paper feeder uses one motor for the cassette lift-up operation.

Table

1-17 Motors, paper feeder

Component name Components driven

The paper feeder does not detect lifter motor failures.

Lifter motor

Pickup and feed operation

The paper feeder picks up the sheet of paper one by one in the paper feeder cassette and feeds it to the printer.

Electrical components, pickup and feed

Lifts up the cassette

The gure below shows the paper feeder electrical components. The table in this section describes the electrical components.

36 Chapter 1 Theory of operation ENWW

Figure 1-27 Electrical components, pickup and feed

SL4

SW3

PS461

PS460

Table 1-18 Electrical components, pickup and feed

Abbreviation Component name

Fuser motor

M5 Lifter motor

SL4 Cassette pickup solenoid

SW3 Cassette detection switch

PS460 Media surface sensor

PS461 Cassette media out sensor

This motor is located in the printer.

Other functions

The paper feeder has the following pickup and feed functions.

Table

1-19 Other functions, paper feeder

Function Supported feature

Cassette lift-up control Yes

Cassette presence detection Yes

Cassette media size detection No

Cassette media stack surface detection Yes

Cassette media out detection Yes

Cassette media level detection No

Multiple-feed prevention Yes

Automatic delivery Yes

ENWW Paper feeder (optional Tray 3) 37

Jam detection

The DC controller in the printer detects jams during the paper feeder pickup and feed operation. See Jam

detection/prevention on page 31.

38 Chapter 1 Theory of operation ENWW

2 Solve problems

●

For additional service and support

●

Solve problems checklist

●

Troubleshooting process

●

Tools for troubleshooting

●

Clear paper jams

●

Solve paper-handling problems

●

Solve image quality problems

●

Clean the printer

●

Solve performance problems

●

Solve connectivity problems

●

Service mode functions

●

Solve fax problems (fax models only)

●

Solve email problems (M426, M427 printes)

●

Manually update the rmware

ENWW 39

For additional service and support

HP service personnel, go to the Service Access Work Bench (SAW) at http://h41302.www4.hp.com/km/saw/

home.do.

Channel partners, go to HP Channel Services Network (CSN) at https://h30125.www3.hp.com/hpcsn.

At these locations, nd information on the following topics:

●

Install and congure

●

Printer specications

●

Up-to-date control panel message (CPMD) troubleshooting

●

Solutions for printer issues and emerging issues

●

Remove and replace part instructions and videos

●

Service advisories

●

Warranty and regulatory information

To access HP PartSurfer information from any mobile device, go to http://partsurfermobile.hp.com/ or scan the Quick Response (QR) code below.

40 Chapter 2 Solve problems ENWW

Solve problems checklist

●

Solve problems checklist

If the printer is not correctly functioning, complete the steps (in the order given) in the following checklist. If the printer fails a checklist step, follow the corresponding troubleshooting suggestions for that step. If a checklist step resolves the problem, skip the remaining checklist items.

1. Make sure that the printer is set up correctly.

a. Press the power button to turn on the printer or to deactivate the Auto-O mode.

b. Check the power-cable connections.

c. Make sure that the line voltage is correct for the printer power conguration. See the label that is

on the printer for voltage requirements. If you are using a power strip and its voltage is not within

specications, plug the printer directly into the wall. If it is already plugged into the wall, try a dierent outlet.

2. Check the cable connections.

a. Check the cable connection between the printer and the computer. Make sure that the connection

is secure.

b. Make sure that the cable itself is not faulty, by using a dierent cable if possible.

c. Check the network connection: Make sure that the network light is lit. The network light is next to

the network port on the back of the printer.

If the printer remains unable to connect to the network, uninstall and then reinstall the printer. If the error persists, contact a network administrator.

3. Check to see if any messages appear on the control panel.

4. Make sure that the paper you are using meets specications.

5. Make sure that the paper is loaded correctly in the input tray.

6. Make sure that the printer software is installed correctly.

7. Verify that you have installed the printer driver for this printer, and that you are selecting this printer

from the list of available printers.

8. Print a conguration page.

a. 2-line control panels: On the printer control panel, press the OK button.

Touchscreen control panels: From the Home screen on the printer control panel, touch the Setup

button.

b. Open the Reports menu.

c. Select Conguration Report.

ENWW Solve problems checklist 41

After printing the conguration page, check the following:

a. If the page does not print, verify that the input tray contains paper and that the paper is properly

loaded.

b. Make sure that the toner cartridge is installed correctly.

c. If the page jams in the printer, clear the jam.

d. If the print quality is unacceptable, complete the following steps:

●

9. Print a small document from a dierent program that has printed in the past. If this solution works, then

the problem is with the program you are using. If this solution does not work (the document does not print), complete these steps:

a. Try printing the job from another computer that has the printer software installed.

b. Check the cable connection. Direct the printer to the correct port, or reinstall the software,

selecting the connection type you are using.

Print the menu map

To more easily navigate individual settings, print a report of the complete printer menus.

Verify that the print settings are correct for the paper you are using.

Solve print-quality problems.

1. 2-line control panels: On the printer control panel, press the OK button.

Touchscreen control panels: From the Home screen on the printer control panel, touch the Setup

button.

2. Open the Reports menu.

3. Select Menu Structure.

Print a conguration page

Print a conguration page to test the printer.

1. 2-line control panels: On the printer control panel, press the OK button.

Touchscreen control panels: From the Home screen on the printer control panel, touch the Setup

button.

2. Open the Reports menu.

3. Select Conguration Report.

42 Chapter 2 Solve problems ENWW

Print the service page (includes the event log)

Printing the service page provides a list of printer settings that might be helpful in the troubleshooting process, as well as the event log, which stores the last 10 error events that the printer experienced.

1. 2-line control panels: On the printer control panel, press the OK button.

Touchscreen control panels: From the Home screen on the printer control panel, touch the Setup

button.

2. Open the Reports menu.

3. Select the Service Page option to print the report.

The event log is located in the lower right-hand corner of the service page.

Print the demo page

Print a product demo page.

2-line control panels

▲

With the printer in the Ready state, press the OK button and the Cancel button at the same time.

Touchscreen control panels

From the Home screen on the printer control panel, touch the Setup button.

2. Open the Reports menu.

3. Select Demo Page.

ENWW Solve problems checklist 43

Troubleshooting process

●

Determine the problem source

●

Power subsystem

●

Control panel checks

Determine the problem source

When the printer malfunctions or encounters an unexpected situation, the printer control panel alerts the user to the situation. This section contains a pre-troubleshooting checklist to of the problem. Use the troubleshooting owchart to help diagnose the root cause of the problem. The remainder of this chapter provides steps for correcting problems.

●

Use the troubleshooting owchart to pinpoint the root cause of hardware malfunctions. The owchart provides guides to the sections of this chapter that contain steps to correct the malfunction.

Before beginning any troubleshooting procedure, check the following issues:

●

Are supply items within their rated life?

●

Does the conguration page reveal any conguration errors?

NOTE: The customer is responsible for checking supplies and for using supplies that are in good condition.

lter out many possible causes

Pre-troubleshooting checklist

The following table includes basic questions to ask the customer to quickly help dene the problem(s).

General topic Questions

Environment

Media

Input trays

●

Is the printer installed on a solid, level surface (+/- 1°)?

●

Is the power-supply voltage within ± 10 volts of the specied power source?

●

Is the power-supply plug inserted in the printer and the outlet?

●

Is the operating environment within the specied parameters?

●

Is the printer exposed to ammonia gas, such as that produced by diazo copiers or oice cleaning materials?

NOTE: Diazo copiers produce ammonia gas as part of the copying processes.

Ammonia gas (from cleaning supplies or a diazo copier) can have an adverse eect on some printer components (for example, the toner cartridge OPC).

●

Is the printer exposed to direct sunlight?

●

Does the customer use only supported media?

●

Is the media in good condition (no curls, folds, or distortion)?

●

Is the media stored correctly and within environmental limits?

●

Is the amount of media in the tray within specications?

●

Is the media correctly placed in the tray?

●

Are the paper guides aligned with the stack?

●

Is the tray correctly installed in the printer?

44 Chapter 2 Solve problems ENWW

General topic Questions

Toner cartridge

Transfer unit and fuser

Covers

Condensation

Miscellaneous

●

Is the toner cartridge installed correctly?

●

Are the transfer unit and fuser installed correctly?

●

Is the toner cartridge door closed?

●

Does condensation occur following a temperature change (particularly in winter following cold storage)? If so, wipe aected parts dry or leave the printer on for 10 to 20 minutes.

●

Was a toner cartridge opened soon after being moved from a cold to a warm room? If so, allow the toner cartridge to sit at room temperature for 1 to 2 hours.

●

Check for and remove any non-HP components (toner cartridges, memory modules, and EIO cards) from the printer.

●

If the hardware or software conguration has not changed or the problem is not associated with any specic software, see the complete service manual for this printer.

●

Remove the printer from the network and ensure that the failure is associated with the printer before beginning troubleshooting.

●

For any print-quality issues, calibrate the printer.

ENWW Troubleshooting process 45

Determine the problem source

The following table includes basic questions to ask the customer to quickly help dene the problem or problems.

General topic Questions

Environment

Paper

Input tray

Supplies

●

Is the printer installed on a solid, level surface (± 1°)?

●

Is the power-supply voltage within ± 10 volts of the specied power source?

●

Is the power-supply plug inserted in the printer and the outlet?

●

Is the operating environment within the specied parameters?

●

Is the printer exposed to ammonia gas, such as that produced by diazo copiers or oice cleaning materials?

NOTE: Diazo copiers produce ammonia gas as part of the coping processes.

Ammonia gas (from cleaning supplies or a diazo copier) can have an adverse aect on some printer components (for example, the toner cartridge imaging drum).

●

Is the printer exposed to direct sunlight?

●

Does the customer use only supported paper?

●

Is the paper in good condition (no curls, folds, or distortion)?

●

Is the paper stored correctly and within environmental limits?

●

Is the amount of paper in the tray within specications?

●

Is the paper correctly placed in the tray?

●

Are the paper guides aligned with the stack?

●

Is the toner cartridge installed correctly and rmly seated?

Transfer roller and fuser

Covers

Condensation

Miscellaneous

●

Has the sealing tape been removed from the toner cartridge?

●

Is the toner cartridge within its estimated life? (Check the supplies status page.)

●

Are the transfer roller and fuser installed correctly?

●

Are the front and rear doors rmly closed?

●

Does condensation occur following a temperature change (particularly in winter following cold storage)? If so, wipe aected parts dry or leave the printer on for 90 to 120 minutes.

●

Was a toner cartridge opened soon after being moved from a cold to a warm room? If so, allow the toner cartridge to sit at room temperature for 1 to 2 hours.

●

Check for and remove any non-HP components (for example, a toner cartridge) from the printer.

●

Remove the printer from the network and make sure that the failure is with the printer before beginning troubleshooting.

46 Chapter 2 Solve problems ENWW

Power subsystem

Power-on checks

When you turn on the printer, if it does not make any sound or if the control-panel display is blank, check the following items:

●

Verify that the printer is plugged directly into an active electrical outlet that has the correct voltage. Do not plug the printer into a surge protector or power strip.

●

Verify that the on/o switch is in the on position.

●

Verify that the formatter is seated and operating correctly.

●

Remove any HP Jetdirect accessories or other devices, and then try to turn the printer on again.

●

Make sure that the control-panel display is connected.

●

Check the two fuses on the power supply.

●

If necessary, replace the power supply.

●

If necessary, replace the DC controller.

Control panel checks

The printer includes diagnostic tests for the control panel. This mode allows for troubleshooting issues with the LEDs (2-line control panels), display, and the buttons.

1. Open the secondary service menu.

2-line control panels

a. From the printer control panel, press the OK button.

b. Press and hold the left arrow button.

c. Press the Cancel button.

d. Press the OK button to reopen the Setup menu.

e. Scroll to the 2ndary Service menu, and then press the OK button.

Touchscreen control panels

From the Home screen on the printer control panel, touch the Setup button.

Touch the space between the Home and Help buttons.

Touch the Back button.

Touch the Setup button.

e. Scroll to and touch the 2ndary Service menu.

2. Select one of the following tests:

ENWW Troubleshooting process 47

●

LED test: Test the LED lights on 2-line control panels. The touchscreen control panels do not have

any LEDs.

●

Display Test: Test the control panel display.

●

Button Test: Test the control panel buttons.

48 Chapter 2 Solve problems ENWW

Tools for troubleshooting

The section describes the tools that can help solve problems with the printer.

Component diagnostics

LED diagnostics

Network LEDs (network models only)

The onboard network solution has two network port LEDs. When the printer is connected to a properly working network through a network cable, the yellow LED indicates network activity, and the green LED indicates the link status. A blinking yellow LED indicates network traic. If the green LED is o, a link has failed.

For link failures, check all of the network cable connections. In addition, you can try to manually congure the network card link speed setting by using the printer control-panel.

Change the Link Speed setting on an LCD control panel

1. At the printer control panel, press the OK button to open the menus.

2. Select the Network Setup menu, and then press the OK button.

3. Select the Link Speed item, and then press the OK button.

4. Select the appropriate link speed, and then press the OK button.

Change the Link Speed setting on a touchscreen control panel

From the Home screen on the printer control panel, touch the Setup button.

2. Scroll to, and then touch the Network Setup menu.

3. Scroll to, and then touch Link Speed item.

4. Touch the appropriate link speed.

Control panel LEDs

The state of the Ready light and Attention light on the printer signal the printer status. The following table outlines the possible control-panel light states.

Printer state Ready light state Attention light state

Initializing Blinking Blinking

Ready On O

Receiving data/processing job or cancelling job

Error message O Blinking

Fatal error (49 or 79 error)

The printer will power o and then power on after one of these errors occurs.

Blinking O

On On

ENWW Tools for troubleshooting 49

Engine diagnostics

Engine test

When the engine test is performed, a test page with horizontal lines prints if the engine is functioning correctly.

To perform the test do one of the following (with the printer in the Ready state):

●

Simplex printers: Depress and hold the cartridge door release button, and then open and shut the cartridge door three times within a three second time period. A single-sided test page prints.

●

Duplex printers: Depress and hold the cartridge door release button, and then open and shut the cartridge door four times within a three second time period. A double-sided test page prints.

NOTE: A single-sided test page prints if the duplex function is disabled.

50 Chapter 2 Solve problems ENWW

Diagrams

5 6 7

8 9

Use the diagrams in this section to identify printer components.

Diagrams: Block diagrams

Cross-sectional view of printer

Figure 2-1 Cross-sectional view of printer

Item Description Item Description

1 Fuser output roller 12 Feed roller

2 Duplex apper (duplex models only) 13 Cassette feed roller

3 Output roller 14 Cassette separation roller

4 Fuser lm 15 Cassette pickup roller

5 Fuser 16 Duplex re-pickup roller (duplex models only)

6 Photosensitive drum 17 Registration roller

7 Laser scanner assembly 18 Cassette

8 Toner cartridge 19 Transfer roller

9 Registration shutter 20 Duplex feed roller (duplex models only)

10 Multipurpose tray pickup roller 21 Pressure roller

11 Multipurpose tray separation pad

ENWW Tools for troubleshooting 51

Cross-sectional view of 550–sheet paper feeder

Figure 2-2 Cross-sectional view of 500–sheet paper feeder

Item Description Item Description

1 Cassette 4 Feed roller

2 Cassette pickup roller 5 Cassette separation roller

3 Cassette feed roller

52 Chapter 2 Solve problems ENWW

Diagrams: Printed circuit assembly (PCA) connector locations

J10

●

Diagrams: DC controller connections

●

Paper feeder controller PCA

Diagrams: DC controller connections

Each of the connections on the DC controller PCA is indicated in the following gure.

Figure 2-3 DC controller PCA connectors

Table 2-1 DC controller connectors

Item Description Item Description

J1 Low-voltage power supply assembly J7 Media-width sensor

J2 High-voltage power supply PCA Duplex feed sensor (duplex models only)

J3 Formatter TOP sensor

J4 Laser assembly J8 Cassette media out sensor

J5 Connector PCA J9 Multipurpose tray media out sensor

J6 Output bin media-full sensor J10 Memory tag (E-label)

Fuser output sensor Loop sensor

Thermistor

ENWW Tools for troubleshooting 53

Paper feeder controller PCA

J603

J601

J600

J605

J602

J604

Figure 2-4 Paper feeder controller PCA connectors

Table 2-2 Paper feeder controller PCA connectors

Item Description Item Description

J600 Printer J603 Media surface sensor

J601 Cassette detection switch J604 Cassette pickup solenoid

J602 Cassette media out sensor J605 Lifter motor

Diagrams: External plug and port locations

Figure 2-5 M402, M403 external plugs and ports locations

Table

2-3 M402, M403 external plugs and ports

Item Description

1 USB port (for job storage and private printing)

NOTE: This port might be covered

54 Chapter 2 Solve problems ENWW

Table 2-3 M402, M403 external plugs and ports (continued)

Item Description

2 USB interface port

3 Ethernet port

4 Power connection

Figure 2-6 M426, M427 external plug and port locations

Table 2-4 M426, M427 external plugs and ports

Item Description

1 USB port (for job storage and private printing)

NOTE: This port might be covered

2 USB interface port

3 Ethernet port

4 Telephone “line out” port (for attaching an extension phone, answering machine, or other device)

5 Fax “line in” port (for attaching the fax phone line to the printer)

6 Power connection

ENWW Tools for troubleshooting 55

Diagrams: Locations of major components

Major components (printer base)

Figure 2-7 Major components (printer base)

Table 2-5 Major components (printer base)

Item Description

1 Fuser

2 Registration assembly

3 Laser/scanner assembly

56 Chapter 2 Solve problems ENWW

Motor and fan

Figure 2-8 Motor and fan

Table 2-6 Motor and fan (printer base)

Item Description

1 Fuser motor (M1)

2 Main fan (FM1)

ENWW Tools for troubleshooting 57

Rollers and pads (printer base)

Figure 2-9 Rollers and pads (printer base)

Table 2-7 Rollers and pads (printer base)

Item Description Item Description

1 Transfer roller 4 MP tray pickup roller

2 MP tray separation pad 5 Pickup roller assembly

3 Separation roller assembly

58 Chapter 2 Solve problems ENWW

PCAs (printer base)

Figure 2-10 Main PCAs (printer base)

Table 2-8 Main PCAs (printer base)

Item Description Item Description

1 High-voltage power supply assembly Not shown Formatter PCA

2 DC controller PCA Not shown Wireless PCA (wireless models only)

3 Low-voltage power supply assembly Not shown Fax PCA (fax models only)

ENWW Tools for troubleshooting 59

Diagrams: Timing chart

Timing chart two consecutive prints on LTR paper

12 Developing bias

13 T ransfer bias

14 Main f an (FM1)

9 Fuser motor (M1)

10 Fus er heater

11 Pr imary charging bias

6 BD signal

7 Scanner motor (M3)

4TOP sensor (PS2)

5 Fuser output sensor (PS13)

LSTR STBY

1 Print command

2 Cassette pick up solenoid (SL1)

WAIT

STBY

INTR

Power ON

Figure 2-11 General timing chart

60 Chapter 2 Solve problems ENWW

Diagrams: Circuit diagrams

6 5 4 3

12345 123

123

SGND

/VDO1

VDO1

SGND

/VDO2

SGND

VDO2

CLEI

/BDO

SGND

CLEO

GND

PRIACCLK

PRIDCPWM

PRIACPWM

TNR

FANON

FANLOCK

TRPWM

DEVDCSNS

DEVACPWM

DEVACCLK

TRCRNT

TRPCLK

TRNCLK

+5.4V

+24VA

SGND

+24VBSNS

24VCON

345612

J1302A

J507

345612

J1302S

345612

USB PCA

J508

J510

J503

J505

WiFi

+5V

/CPRESET

/CPCLK

CPCLK

CPIN

GND

+3.3V

CPOUT

J504

J44

123745689

987653421

J33

Contorl panel

(Magic frame)

J509

J506

SGND

+3.3VC

J213

TP1

SGND

LVPSGND

SGND

+3.3VC

+24VD

AC-N

AC-H

PS13

FU2

FU1

J4203

J4204

J4202

J4201

J410DH

J410L

J410D

TH1

+3.3VB(GY)

NFCS(BL)

SGND

MAINTH

FSROUTSNS(GN)

SGND(BR)

J407J406

121234

PS4

321

Inlet

SOLD210

SOLD211

LVPS_GND

+24VD

1234

J203

AC-H

AC-N

J210

J211

231

J212

J207A

J206A

J204A

J205A

J209A

J208A

J207S

J206S

J204S

J205S

982345617

J201

J501

FANON

FANLOCK

GND

123

J301

FM1

321

J341

1234567891011121314151617

123456789

101112131415161718

412356789

101112

4123567891011

LVPS_GND

FREQSNS_LVT

/3.3VCON

RLYD

PWRSAVE2

24VDON

24VD

24VA

FSRD

3.3VA

109

82345617

SGND

MAINTH

FSROUTSNS

FULLSNS

+3.3VB

NFCS

234

J405

1234

TOPSNS(BR)

SGND(W)

+3.3VB(BL)

TAG

MPTPSNS(W)

SGND(BR)

+3.3VB(R)

CSTPSNS(W)

SGND(BR)

+3.3VB(Y)

REFEEDSNS(V)

TOPSNS(GY)

SGND(R)

PWSNSAND(W)

+3.3VB(BR)

J7 J9J8

SGND

+3.3VB

/LDPWM

/BDI

VDO1

VDO2

/VDO2

SGND

/VDO1

LDCTRL1

LDCTRL0

LDCTRL2

678

1011121314

41235

987654321

1314121110

J18

J10

VSS(W)

VIN(BL)

123

OPTPLVLSNS(SI)

OPTLIFTMT

+3.3VB

OPTSNSAD

DUPSWBKSL

REFEEDCL

OPTPICKSL(SO)

SGND

PWRLED_ON

PWRLED_PWR

BLMFG

PWRSW

AIRTMP

/BLMACC

/SCNACC

/BLMDEC

CSTSL

MPTSL

/SCNDEC

191817161514131211

987653241

13121415161718

4235678910

J4011

J4121

J4122

J4012

J4013

J4123

PS1

PS3

PS1a

PS2b

123

J700

PS2

J4031

J4033

J4032

J7014

J7013

J7012

J7011

J7015

High-voltage power supply PCA

DC controller

1234

J802

J811

Laser/scanner ass’y

+24VD

PGND

/SCNDEC

/SCNACC

LVPS_GND

+24VD

LVPS_GND

J13B

(REFEEDCL)

+24VD

J111B

J13A

CL1

SL3

SW1LED1

1234

J701

1234567

J705

7653214

J13DH

J13L

J13D

SL1

SL2

(CSTSL)

+24VD

(MPTSL)

PGND

+24VD

BLMFG

/BLMDEC

+24VD

/BLMACC

(DUPSWBKSL)

+24VD

(REFEEDCL)

+24VD

+3.3VB

SGND

OPTSNSAD

OPTLIFTMT

OPTPLVLSNS

OPTPICKSL

SGND

AIRTMP

PWRSW

PWRLED_ON

PWRLED_PWR

1234

J105

J104

J102 J110

1234567121212345

J107 J109

J101

121234567

1234

J106

J103

J111A

1234567

Connector PCA

OPTCSTPSNS(GN)

+3.3VB(Y)

SGND

OPTCSTSNS

+24VD(BR)

+24VD

OPTPICKSL

OPTLIFTMT(W)

SGND(BR)

+3.3VB(V)

OPTPLVLSNS(GN)

SGND(BR)

J691LH

J691D

J691DH

J691L

PS461

PS460

SOLD6121

SOLD6122

J4611

J4612

J4613

J4601

J4602

J4603

SL4

J692DH

J692L

J692D

1234567

231

21212

J601

J600

J602

J603J605J604

Paper feeder controller PCA

SW3

CL1

Low-voltage power supply PCA

Formatter

NFC PCA

Contorl panel

LCD PCA

Contorl panel

SW PCA

Laser PCA

Figure 2-12 General circuit diagram (printer base)

ENWW Tools for troubleshooting 61

Advanced conguration with HP Embedded Web Server (EWS) and HP Device Toolbox (Windows 7)

Use the HP Embedded Web Server to manage printing functions from a computer instead of the printer control panel.

●

View printer status information

●

Determine the remaining life for all supplies and order new ones

●

View and change tray congurations

●

View and change the printer control-panel menu conguration

●

View and print internal pages

●

Receive notication of printer and supplies events

●

View and change network conguration

The HP Embedded Web Server works when the printer is connected to an IP-based network. The HP Embedded Web Server does not support IPX-based printer connections. Internet access is not needed to open and use the HP Embedded Web Server.

When the printer is connected to the network, the HP Embedded Web Server is automatically available.

NOTE: HP Device Toolbox is software used to connect to the HP Embedded Web Server when the printer is

connected to a computer via USB. It is available only if a full installation was performed when the printer was installed on a computer. Depending on how the printer is connected, some features might not be available.

NOTE: The HP Embedded Web Server is not accessible beyond the network rewall.

Method one: Open the HP Embedded Web Server (EWS) from the Start menu

1. Click the Start button, and then click the Programs item.

2. Click the HP printer group, and then click the HP Device Toolbox item.

Method two: Open the HP Embedded Web Server (EWS) from a Web browser

1. Use one of the following methods to obtain the IP address based on your printer model:

M402, M403

●

On the printer control panel, press the OK button. Open the Network Setup menu, and then select Show IP Address to display the IP address or host name.

M426, M427

●

From the Home screen on the printer control panel, touch the Connection Information

button, and then touch the Network Connected button or the Network Wi-Fi ON button to display the IP address or host name.

62 Chapter 2 Solve problems ENWW

2. Open a Web browser, and in the address line, type the IP address or host name exactly as it displays on

the printer control panel. Press the Enter key on the computer keyboard. The EWS opens.

NOTE: If the Web browser displays a There is a problem with this website’s security certicate

message when attempting to open the EWS, click Continue to this website (not recommended).

Choosing Continue to this website (not recommended) will not harm the computer while navigating within the EWS for the HP printer.

Tab or section Description

Home tab

Provides printer, status, and conguration information.

System tab

Provides the ability to congure the printer from your computer.

●

Device Status: Shows the printer status and shows the approximate percent life remaining of HP supplies.

●

Supplies Status: Shows the approximate percent life remaining of HP supplies. Actual supply life remaining can vary. Consider having a replacement supply available to install when print quality is no longer acceptable. The supply does not need to be replaced unless the print quality is no longer acceptable.

●

Device Conguration: Shows the information found on the printer conguration page.

●

Network Summary: Shows the information found on the printer network conguration page.

●

Reports: Print the conguration and supplies status pages that the printer generates.

●

Job Storage Log: Shows a summary of all jobs stored in the printer memory.

●

Event Log: Shows a list of all printer events and errors.

●

Device Information: Provides basic printer and company information.

●

Paper Setup: Change the default paper-handling settings for the printer.

●

Print Quality: Change the default print-quality settings for the printer.

●

Energy Settings: Change the default times for entering Sleep/Auto O mode or automatic shut down.

●

Job Storage Setup: Congure the job storage settings for the printer.

●

Print Density: Change the print density of contrasts, highlights, midtones, and shadows

●

Paper Types: Congure print modes that correspond to the paper types that the printer accepts.

●

System Setup: Change the system defaults for the printer.

●

Supply Settings: Change the settings for Cartridge is low alerts and other supplies information.

●

Service: Perform the cleaning procedure on the printer.

●

Save and Restore: Save the current settings for the printer to a le on the computer. Use this le to load the same settings onto another printer or to restore these settings to this printer at a later time.

●

Administration: Set or change the printer password. Enable or disable printer features.

NOTE: The System tab can be password-protected. If this printer is on a network, always

consult with the administrator before changing settings on this tab.

ENWW Tools for troubleshooting 63

Tab or section Description

Print tab

Provides the ability to change default print settings from your computer.

Fax tab

(M426, M427 models only)

Scan tab

(M426, M427 models only)

●

Printing: Change the default printer print settings, such as number of copies and paper orientation. These are the same options that are available on the control panel.

●

PCL5c: View and change the PCL5c settings.

●

PostScript: Turn o or on the Print PS Errors feature.

●

Receive Options: Congure how the printer handles incoming faxes.

●

Phone Book: Add or delete entries in the fax phone book.

●

Junk Fax List: Set fax numbers to block from sending faxes to the printer.

●

Fax Activity Log: Review recent fax activity for the printer.

Congure the Scan to Network Folder and Scan to E-mail features.

●

Network Folder Setup: Congure folders on the network to which the printer can save a scanned le.

●

Scan to E-mail Setup: Begin the process to set up the Scan to E-mail feature.

●

Outgoing E-mail Proles: Set an email address that will appear as the “from” address for all emails sent from the printer.

●

Default SMTP Conguration: Congure the SMTP Server information.

●

E-mail Address Book: Add or delete entries in the email address book.

●

Network Contacts Setup: Congure the printer to connect to a network address book.

●

Networking tab

(Network-connected printers only)

Provides the ability to change network settings from your computer.

HP Web Services tab Use this tab to set up and use various Web tools with the printer.

Network administrators can use this tab to control network-related settings for the printer when it is connected to an IP-based network. It also allows the network administrator to set up Wi-Fi Direct functionality. This tab does not appear if the printer is directly connected to a computer.

Internal print-quality test pages

Clean the paper path

During the printing process, paper, toner, and dust particles can accumulate inside the printer. Over time, this buildup can cause print-quality problems such as toner specks or smearing. This printer has a cleaning mode that can correct and prevent these types of problems.

Clean the paper path (LCD control panel)

1. On the printer control panel, press the OK button to open the menus.

2. Open the following menus:

E-mail Options: Congure a default subject line and body text. Congure default scan

settings for emails.

64 Chapter 2 Solve problems ENWW

●

Service

●

Cleaning Page

3. Load plain paper in Tray 1, and then press the OK button to start the cleaning process.

Wait until the process is complete. Discard the page that prints.

Clean the paper path (touchscreen control panel)

From the Home screen on the printer control panel, touch the Setup button.

2. Touch the Service menu.

3. Touch the Cleaning Page button.

4. Load plain letter or A4 paper when you are prompted.

5. Touch the OK button to begin the cleaning process.

Wait until the process is complete. Discard the page that prints.

Print the conguration page

The conguration page lists current printer settings and properties. This page also contains a status log report. To print a conguration page, complete one of the following procedures.

Print the conguration page from an LCD control panel

1. On the printer control panel, press the OK button to open the menus.

2. Use the arrow buttons to select the Reports menu, and then press the OK button.

3. Use the arrow buttons to select the Conguration Report item, and then press the OK button to print the

report.

Print the conguration page from a touchscreen control panel

From the Home screen on the printer control panel, touch the Setup button.

2. Touch the Reports menu.

3. Touch the Conguration Report button to print the report.

ENWW Tools for troubleshooting 65

Print-quality troubleshooting tools

Repetitive image defect ruler

Defects on printer rollers can cause image defects to appear at regular intervals on the page, corresponding to the circumference of the roller that is causing the defect. Measure the distance between defects that recur on a page (See Use a ruler to measure between repetitive defects on page 66). Use the following table or the repetitive-defect ruler to determine which roller is causing the defect. To resolve the problem, try cleaning the roller rst. If the roller remains dirty after cleaning or if it is damaged, replace the part that is indicated in the following table.

CAUTION: Do not use solvents or oils to clean rollers. Instead, rub the roller with a lint-free cloth. If dirt is

diicult to remove, rub the roller with a lint-free cloth that has been dampened with water.

NOTE: The following table replaces the graphical repetitive defect ruler. You can make your own ruler by

using these measurements. For the most accurate results, use a metric ruler.

Table 2-9 Repetitive defects

Component Distance between defects

Primary charging roller

Developer roller

Transfer roller 39 mm (1.54 in)

28 mm (1.10 in)

31 mm (1.22 in)

Registration roller 43 mm (1.69 in)

Cassette separation roller 44 mm (1.73 in)

Cassette pickup roller

Cassette feed roller

Fuser lm 57 mm (2.24 in)

Pressure roller

Photosensitive drum

The primary charging roller, photosensitive drum and developer roller cannot be cleaned as these rollers are located inside the toner cartridge. If any of these rollers are indicated, replace the toner cartridge.

The primary fuser sleeve unit or pressure roller cannot be cleaned because they are internal assemblies in the fuser. If one of these assemblies is causing the defect, replace the fuser.

Use a ruler to measure between repetitive defects

The gures in this section shows color repetitive defect pages. However, the process for measuring repetitive defects is valid for mono pages.

1. Identify a repetitive defect on the page.

TIP: Print a cleaning page to see if that resolves the defect.

50 mm (1.97 in)

63 mm (2.48 in)

75 mm (2.95 in)

66 Chapter 2 Solve problems ENWW

The example pages below show the following types of repetitive defects.

1 2

NOTE: These are examples only, other types of repetitive defects might appear on a page.

●

Lines (callout 1)

●

Smudges (callout 2)

●

Dots or spots (callout 3)

Figure 2-13 Examples of repetitive defects

ENWW Tools for troubleshooting 67

2. Position a metric ruler on the page with the “zero” ruler mark at one occurrence of the defect (callout 1).

Figure 2-14 Place the ruler on the page

3. Locate the next occurrence of the defect (callout 1).

Figure 2-15 Locate the next repetitive defect

68 Chapter 2 Solve problems ENWW

4. Measure the distance (in millimeters) between the two occurrences (callout 1), and then use Table 2-9

Repetitive defects on page 66 to determine the defective assembly.

TIP: Always measure from and to the same point on the defects. For example, if the ruler is “zeroed”

at the top edge of a defect, measure to the top edge of the next occurrence of that defect.

Figure 2-16 Determine the defective assembly

ENWW Tools for troubleshooting 69

Control panel menus

●

HP Web Services menu

●

Reports menu

●

Quick Forms menu

●

USB Flash Drive menu

●

System Setup menu

●

Service menu

●

Network Setup menu

HP Web Services menu

Use the HP Web Services menu to set up the HP Web Services features.

Menu item Description

Print Information Sheet Prints a report that instructs the user how to set up the HP Web Services features.

Display Address Displays the printer email address.

Turn ePrint On/O Enables or disables the printer HP ePrint functionality.

Turn Apps On/O Enables or disables the printer HP Web Services applications.

Enable Web Services Enables the HP Web Services features.

Remove Services Removes the HP Web Services features from the printer.

Clear Apps History Deletes the stored history of the printer HP Web Services applications.

Proxy Settings Allows you to enter proxy server information for the printer internet connection.

Reports menu

Use the Reports menu to print reports that provide information about the printer.

Menu item Description

Demo Page Prints a sample page that demonstrates print quality.

Menu Structure Prints a map of the control panel-menu layout. The active settings for each menu are

Conguration Report Prints a list of all the printer settings. Includes network information when the printer is

listed.

connected to a network.

70 Chapter 2 Solve problems ENWW

Menu item Description

Supplies Status Prints the status for each toner cartridge, including the following information:

●

Estimated percentage of cartridge life remaining

●

Approximate pages remaining

●

Part numbers for HP toner cartridge

●

Number of pages printed

●

Information about ordering new HP toner cartridges and recycling used HP toner cartridges

Network Summary Prints a list of all printer network settings

Usage Page Prints a page that lists PCL pages, PCL 6 pages, PS pages, pages that were jammed or

mispicked in the printer, and reports the page count

PCL Font List Prints a list of all the PCL fonts that are installed

Prints a list of all the PostScript (PS) fonts that are installed

PCL6 Font List Prints a list of all the PCL6 fonts that are installed

Service Page Provides information on supported paper types, copy settings, and other miscellaneous

settings that are not on the conguration page

Quick Forms menu

Menu item Sub-menu item Description

Notebook Paper Narrow Rule

Graph Paper 1/8 inch

Checklist 1 Column

Music Paper Portrait

USB Flash Drive menu

Print Documents

Prints pages that have preprinted lines

Wide Rule

Child Rule

Prints pages that have preprinted graph lines

5 mm

Prints pages that have preprinted lines with check boxes

2 Column

Prints pages that have preprinted lines for writing music

Landscape

Prints documents stored on the USB drive. Use the arrow buttons to scroll through the documents. Touch the names of documents that you want to print.

Touch the summary screen to change settings such as the number of copies, the paper size, or the paper type.

Touch the Print button when you are ready to print the documents.

ENWW Tools for troubleshooting 71

Easy Photo Print Prints photo les directly from the printer.

Thumbnail Sheet(s) Prints a page or pages of 30 “thumbnail” graphic images.

View and Print Photos Previews photos on the USB drive. Use the arrow buttons to scroll

Scan to USB Drive Scans a document and stores it as a .PDF document or .JPEG

System Setup menu

In the following table, items that have asterisks (*) indicate the factory default setting.

Menu item Sub-menu item Sub-menu item Description

Language Select the language for the control

NOTE: This menu item is available for LCD control panel models

only.

NOTE: This menu item is available for LCD control panel models

only.

through the photos. Touch the preview image for each photo that you want to print. You can adjust the settings, and you can save the changes as the new default settings. When you are ready to print the photos, touch the Print button.

image on the USB ash drive.

panel display messages and the printer reports.

Paper Setup Def. Paper Size Letter

Legal

Def. Paper Type A list of available

paper types appears.

Tray 1 Paper Type

Paper Size

Tray 2 Paper Type

Paper Size

Sets the size for printing internal

reports or any print job that does not specify a size.

NOTE: The default setting is

determined by the choice of location during the initial printer setup.

Select the paper type for printing

internal reports or any print job that does not specify a type.

Select the default size and type for

Tray 1 from the list of available sizes and types.

Select the default size and type for

Tray 2 from the list of available sizes and types.

72 Chapter 2 Solve problems ENWW

Menu item Sub-menu item Sub-menu item Description

Paper Out Action Wait Forever**

Cancel

Override

Energy Settings Sleep Delay O

1 Minute

15 Minutes*

30 Minutes

Select how the printer should react

when a print job requires a size or type that is not available or when a specied tray is empty.

Select the Wait Forever option to make the printer wait until you load the correct paper and press the OK button. This is the default setting.

Select the Override option to print on a dierent size or type after a specied delay.

Select the Cancel option to automatically cancel the print job after a specied delay.

If you select either the Override or

Cancel options, the control panel

prompts you to specify the number of seconds to delay. Use the arrow buttons to increase (up to 3600 seconds) or decrease the time.

Sets how long the printer remains

idle before it enters sleep mode. The printer automatically exits sleep mode when you send a print job or press a control panel button.

1 Hour

2 Hours

Auto Power Down Auto Power Down

Delay

Wake Events USB Job

Never

30 Minutes

1 Hour

2 Hours

4 Hours

8 Hours

24 Hours

LAN Job

Wireless Job (wireless

models only)

Button Press

USB Drive Insert

Sets the period of time that must elapse before the printer Auto Power Down feature activates.

Enables or disables certain printer events (like when a control panel button is pressed) that will cause the printer to revert from Auto Power Down mode to Ready status.

ENWW Tools for troubleshooting 73

Menu item Sub-menu item Sub-menu item Description

Print Density A range of 1 to 5. Select the print density level. The

default setting is 3

Supply Settings Black Cartridge Very Low Setting Stop

Prompt*

Continue

Low Threshold A percentage range of

1 to 100.

Administration Product Security

(touchscreen control panel models only)

Enable printer security. If turned

Set how the printer behaves when the black toner cartridge reaches the very low threshold.

●

Stop: The printer stops

printing until you replace the toner cartridge.

●

Prompt: The printer stops

printing and prompts you to replace the toner cartridge. You can acknowledge the prompt and continue printing.

●

Continue: The printer alerts

you that the toner cartridge is very low, but it continues printing.

Set the percentage of estimated life remaining at which the printer alerts you that the toner cartridge is low.

on, the printer prompts you to set a password. After it is set, the password will be needed to change printer settings.

USB Flash Drive On*

Display Contrast Medium*

Courier Font Regular*

Quiet Mode Enable or Disable the printer Quiet

Service menu

Use this menu to restore default settings, clean the printer, and activate special modes that aect print output. Items that have asterisks (*) indicate the factory default setting.

Enable or disable the walkup USB

port.

O

Select the level of contrast for the

display.

Darker

Darkest

Lightest

Lighter

Selects a version of the Courier

font..

Dark

Mode.

74 Chapter 2 Solve problems ENWW

Menu item Sub-menu item Sub-menu item Description

Cleaning Page Use this option to clean the printer if

you see toner specks or other marks on the printed output. The cleaning process removes dust and excess toner from the paper path.

When you select this item, the printer prompts you to load plain paper in Tray 1 and then press the OK button to start the cleaning process. Wait until the process is complete. Discard the page that prints.

USB Speed High*

Full

Less Paper Curl On

O*

Archive Print On

O*

Firmware Date Displays the current rmware

Restore Defaults Sets all customized copy settings to

Signature Check Cancel if Invalid*

Prompt if Invalid

HP Smart Install On*

O

Sets the USB speed to High or Full.

For the printer to actually operate at high speed, it must have high speed enabled and be connected to an EHCI host controller that is also operating at high speed. This menu item also does not reect the current operating speed of the printer.

If printed pages are consistently

curled, use this option to set the printer to a mode that reduces curl.

If you are printing pages that will be

stored for a long time, use this option to set the printer to a mode that reduces toner smearing and dusting.

datecode.

the factory default values.

Congures how the printer proceeds

when a rmware upgrade le does not have a valid signature.

Enables or disables the HP Smart

Install functionality.

LaserJet Update Check For Updates Now Prompts the printer to search for a

newer rmware upgrade le and then upload it.

Manage Updates Allow Downgrade Yes*: Allows the rmware upgrade

functionality to upload an older rmware version.

No: Prevents the printer from loading

older rmware les.

Check Automatically On*: Allows the printer to

automatically search for new

rmware updates.

O: Prevents the printer from loading

new rmware update les.

ENWW Tools for troubleshooting 75

Menu item Sub-menu item Sub-menu item Description

Prompt Before Install Install Automatically: Allows the

printer to automatically load a rmware update le.

Always Prompt*: Causes the printer

to display a prompt at the control panel before the printer can load a rmware update le.

Allow Updates Yes*: Allows the printer to load

rmware update les.

No: Prevents the printer from loading

rmware update les.

76 Chapter 2 Solve problems ENWW

Network Setup menu

Use this menu to establish network conguration settings.

Menu item Sub-menu item Description

Wireless Menu (wireless printers

only)

Wireless Setup Wizard

Wi-Fi Protected Setup If your wireless router supports this feature, use this

Run Wireless Test Tests the wireless network and prints a report with the

Turn Wireless On/O Enable or disable the wireless network feature.

TCP/IP Cong Automatic*

IPv4 Cong Method DHCP

Card Sharing On*

Wireless Direct Settings

method to set up the printer on a wireless network. This is the simplest method.

results.

Select Automatic to automatically congure all the TCP/IP settings.

Manual

Select Manual manually congure the IP address, subnet mask, and default gateway.

Set the IPv4 conguration method.

BOOTP

Auto IP

Manual

Enable or disable le sharing of a memory card that has been inserted into the printer walkup USB port.

O

Auto Crossover On*

O

Network Services IPv4

IPv6

Show IP Address No*

Yes

Link Speed Automatic (Default)

10T Full

10T Half

100TX Full

100TX Half

This item is used when you are connecting the printer directly to a personal computer using an Ethernet cable (you might have to set this to On or O depending on the computer being used).

This item is used by the network administrator to limit the network services available on this printer.

O

The default setting is On.

No: The printer IP address will not appear on the control

panel display.

Yes: The printer IP address will appear on the control

panel display.

Sets the link speed manually if needed.

After setting the link speed, the printer automatically restarts.

ENWW Tools for troubleshooting 77

Menu item Sub-menu item Description

Security Product Security (touchscreen

control panel models only)

HTTPS Enforcement Enable or disable the HTTPS Enforcement setting.

Firewall Enable, disable, or reset the printer rewall.

Access Control List Enable, disable, or reset the network access control list.

802.1x (wireless models only) Enable or disable the 802.1x wireless authentication

Reset All Security Reset the security settings to the factory-set default

Restore Defaults Press the OK button to restore the network

USB Flash Drive On

O

Enable printer security. If turned on, the printer prompts you to set a password. After it is set, the password will be needed to change printer settings.

The default setting is On.

protocol.

values.

conguration settings to the default values.

Enable or disable the walkup USB port.

78 Chapter 2 Solve problems ENWW

Control panel message document (CPMD)

Control-panel message types

The control-panel messages and event code entries indicate the current printer status or situations that might require action.

NOTE: Event log errors do not appear on the control-panel display. Open the event log to view or print the

event log errors.

A control-panel message displays temporarily and might require the user to acknowledge the message by touching the OK button to resume printing or by touching the Cancel button to cancel the job. With certain messages, the job might not nish printing or the print quality might be aected. If the message is related to printing and the auto-continue feature is on, the printer will attempt to resume printing after the message has appeared for 10 seconds without acknowledgement.

For some messages, restarting the printer might x the problem. If a critical error persists, the printer might require service.

Control-panel messages and event log entries

NOTE: Some of the messages in the following sections only appear in the event log.

TIP: Some control-panel messages and event log entries refer to a specic printer sensor or switch in the

recommended action to solve the problem. See the diagrams in the clear jams section of this manual for sensor and switch locations.

30.XX Error Messages

30.XXXX Scanner Error

Description

The atbed or ADF scanner is failing to initialize for the following reasons:

●

30.0013 = Scanner failed to nd home

●

30.0016 = Scan sensor communication error

●

30.0017 = Scan motor exceeded max position error

●

30.0023 = ADF scanner calibration error

Recommended action

1. Verify that the product has the most recent rmware from hp.com.

2. Verify that the (at exible cables (FFC’s) are seated correctly on the formatter board.

3. If the error persists, replace the Scanner/ADF Assembly:

Scanner/ADF Ass'y, Duplex ADF

Scanner/ADF Ass'y, Simplex ADF C5F98-60109

C5F98-60110

4. If the error persists, escalate to Level 3 so that Technical Marketing has visibility to the problem.

ENWW Tools for troubleshooting 79

49.XX.YY Error Messages

49 Error, Turn o then on

Description

The product has experienced an internal embedded software error. Under most conditions, the product automatically restarts.

Recommended action

1. Reset the printer:

a. Turn o the power by using the power switch, and then wait at least 30 seconds.

b. Turn on the power and wait for the product to initialize.

2. If you are using a surge protector:

a. Power o the printer.

b. Remove the surge protector.

c. Plug the product directly into the wall socket and turn the product power on.

3. If the error persists, disconnect any network or USB cables and power cycle. If the product returns to

Ready, check the FW version and update if a newer version is available.

4. If the error persists, print a Service Page from the Reports menu. Also, print an Error Report from the

2ndary Service Menu. On the Service Page, look at the xxxx portion of the 49.xxxx errors listed:

●

If the numbers are all or mostly dierent, then power quality is a possible problem; try a dierent wall socket.

●

If the xxxx portion of 49.xxxx contain repeats of the same numbers or groups of numbers, then check the 2ndary Service Error Report printed earlier for indications of a failure in a particular area. The report may indicate whether the error is caused by a network problem or a problem with the job.

5. If the error persists, replace the product.

NOTE: If the 49 Error is caused by the network or a specic le, do not replace the product; it will not

resolve the issue. Instead, attempt to isolate the issue in a way that demonstrates the error is caused by something in the environment.

6. If the error persists after product replacement, escalate to Level 3 so that Technical Marketing has visibility to the problem.

50.XX fuser errors

50.XX Fuser Error, Turn o then on

Description

The product has experienced an internal fuser hardware error:

●

50.00 = Generic Fuser error

●

50.10 = Low Fuser temperature error

80 Chapter 2 Solve problems ENWW

●

50.11 = High sub thermistor area 3 fuser error

●

50.12 = Low sub thermistor area 3 fuser error

●

50.20 = Slow fuser error

●

50.30 = High fuser temperature error

●

50.40 = Fuser drive circuit error

●

50.70 = Fuser open error

●

50.80 = Low sub thermistor fuser error

●

50.90 = High sub thermistor fuser error

Recommended action

1. Reset the product:

a. Turn o the power by using the power switch, and then wait at least 30 seconds.

b. Turn on the power and wait for the product to initialize.

2. If you are using a surge protector:

a. Power o the product.

b. Remove the surge protector.

c. Plug the product directly into the wall socket and turn the product power on.

3. If the error persists, replace the Fusing Assembly:

FUSER ASS'Y (110v) RM2-5399-000CN

FUSER ASS'Y (220v) RM2-5425-000CN

4. If the error persists, replace the product.

51.XX and 52 Laser/Scanner Errors

52 Scanner Error, Turn o then on

Description

An error with the laser/scanner assembly has occurred in the product.

Recommended action

1. Reset the printer:

a. Turn o the power by using the power switch, and then wait at least 30 seconds.

b. Turn on the power and wait for the product to initialize.

2. If you are using a surge protector:

ENWW Tools for troubleshooting 81

a. Power o the printer.

b. Remove the surge protector.

c. Plug the product directly into the wall socket and turn the product power on.

3. If the error persists, replace the product.

51.XX Laser Error, Turn o then on

Description

An error with the laser/scanner assembly has occurred in the product.

●

51.00 = Laser error

●

51.20 = Black laser scanner error

●

51.30 = Laser error

Recommended action

1. Reset the printer:

a. Turn o the power by using the power switch, and then wait at least 30 seconds.

b. Turn on the power and wait for the product to initialize.

2. If you are using a surge protector:

a. Power o the printer.

b. Remove the surge protector.

c. Plug the product directly into the wall socket and turn the product power on.

3. If the error persists, replace the product.

55.XXXX Error Messages

55.XXXX Error, Turn o then on

Description

The product has experienced an error with one of the internal sensors.

●

55.0 = DC controller communication error

●

55.0601 = DC controller NVRAM data error

●

55.0602 = DC controller NVRAM access error

●

55.1 = DC controller memory error

●

55.3 = Engine communication error

Recommended action

1. Reset the printer:

82 Chapter 2 Solve problems ENWW

HP m402, m403, m426, m427 Troubleshooting Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Theory of operation

Related documentation and software

Basic operation

Sequence of operation

Engine-control system

DC controller

Motor control

Fan control

Low-voltage power supply

Over-current/over-voltage protection

Safety

Low-voltage power supply functions

High-voltage power supply

High-voltage power supply circuits

Fuser bias

Fuser control

Fuser circuits

Fuser control functions

Fuser heater protection

Engine laser/scanner system

Laser/scanner failure detection

Safety

Image-formation process

Step 1: Primary charging

Step 2: Laser-beam exposure

Step 3: Development

Step 4: Transfer

Step 5: Separation

Step 6: Fusing

Step 7: Drum cleaning

Toner cartridges

Design

Memory chip

Toner level and cartridge life detection

Pickup, feed, and delivery system

Sensors and switches

Motors, clutches, and solenoids

Jam detection/prevention

Paper feeder (optional Tray 3)

Basic operation

Paper path

Paper feeder controller

Motor control

Pickup and feed operation

Electrical components, pickup and feed

Other functions

Jam detection

2 Solve problems

For additional service and support

Solve problems checklist

Solve problems checklist

Print the menu map

Print the service page (includes the event log)

Print the demo page

Troubleshooting process

Determine the problem source

Pre-troubleshooting checklist

Determine the problem source

Power subsystem

Power-on checks

Control panel checks

Tools for troubleshooting

Component diagnostics

LED diagnostics

Network LEDs (network models only)

Control panel LEDs

Engine diagnostics

Engine test

Diagrams

Diagrams: Block diagrams

Cross-sectional view of printer

Cross-sectional view of 550–sheet paper feeder

Diagrams: Printed circuit assembly (PCA) connector locations

Diagrams: DC controller connections

Paper feeder controller PCA

Diagrams: External plug and port locations