HP LaserJet 4100mfp Service Manual

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hp LaserJet

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hp LaserJet 4100mfp series

service adden du m

Publication number C9148-90909

Second edition, April 2002

Quick reference service PIN code: 04410002

Warranty

The information contained in this document is subject to change without notice.

Hewlett-Packard makes no warranty of any kind with respect to this information. HEWLETT-PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Hewlett-Packard shall not be liable for any direct, indirect, incidental, consequential, or other damage alleged in connection with the furnishing or use of this information.

Trademark Credits

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, Acrobat®, PostScript™, and the Acrobat logo are either registered trademarks or trademarks of Adobe Systems Incorporated in the United States and/or other countries/regions.

Microsoft Windows trademarks of Microsoft Corp.

Netscape™ is a U.S. trademark of Netscape Communications Corporation.

TrueType™ is a U.S. trademark of Apple Computer, Inc.

ENERGY STAR

registered service mark of the United States Environmental Protection Agency.

,MS-DOS, and

are U.S. registered

is a U.S.

Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714 U.S.A.

List of figures

List of tables

1 Product Information

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Product configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

HP LaserJet 4100mfp (C9148A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

HP LaserJet 4101mfp (C9149A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Product features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Product speed and throughput . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Image quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Paper handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Copying capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Expandable design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Product specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Media specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Special considerations for ADF documents. . . . . . . . . . . . . . . . . . . . .18

Supported media for the glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Model and serial numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Product overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Back view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2 Service approach

Service approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Major assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Contact HP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

World Wide Web . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

HP support assistant CD-ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

HP authorized resellers and support . . . . . . . . . . . . . . . . . . . . . . . . . .25

HP service agreements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

3 Operation

Using the ADF unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

General guidelines for using the ADF unit . . . . . . . . . . . . . . . . . . . . .28

Using the glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

General guidelines for using the glass. . . . . . . . . . . . . . . . . . . . . . . . .29

Using the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

C9148-90909 Table of contents 3

Layout and operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Navigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Walk-up copy display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Status bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Menus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Configure device, diagnostic, and service menus . . . . . . . . . . . . . 32

Menu map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4 Maintenance

Cleaning the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

General guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Running the cleaning page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Cleaning the ADF delivery guide (clear mylar strip) . . . . . . . . . . . . . . 37

User-replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Replacing user-replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Updating product firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Downloading a remote firmware update . . . . . . . . . . . . . . . . . . . . . . 41

Installing the update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

RFU installation messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Using HP Web JetAdmin (single update) . . . . . . . . . . . . . . . . . . . 42

Using HP Web JetAdmin (multiple or unattended update) . . . . . . 42

Windows parallel connection (local printer) . . . . . . . . . . . . . . . . . 43

Windows parallel connection (network printer) . . . . . . . . . . . . . . . 43

Troubleshooting RFU installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

RFU installation error messages . . . . . . . . . . . . . . . . . . . . . . . . . 44

Performing hard-drive disk initialization . . . . . . . . . . . . . . . . . . . . . . . 45

Cold Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

NVRAM initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Performing automatic Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Performing manual calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Lead adjustment for the ADF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Center adjustment for the ADF . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Leading-edge adjustment for the glass . . . . . . . . . . . . . . . . . . . . . 49

Side-edge adjustment for the glass . . . . . . . . . . . . . . . . . . . . . . . . 50

5 Theory of operation

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Document transportation process. . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Document exposure system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Light-conversion process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

General descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Scan-unit components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

ADF components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Copy processor board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

CPB terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Typical scanning-process flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Copy processor board LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Scanner controller board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

ADF motor circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Optical-unit motor circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Scan-unit intake-fan motor circuit . . . . . . . . . . . . . . . . . . . . . . . . . 61

4 Table of contents C9148-90909

Scanner controller board connectors . . . . . . . . . . . . . . . . . . . . . . .62

Intermediate PCB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Overcurrent and overvoltage protection . . . . . . . . . . . . . . . . . . . . .63

Power-supply block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

Optical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

Inverter PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

Scanning lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

CCD driver PCB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

ADF document-feed system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

ADF cover sensor (PS10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Document-detect sensor (PS2) . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Leading-edge sensor (PS1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

ADF motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Document pickup process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Document jams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Scan-unit intake fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

6 Removal and replacement

Removal and replacement strategy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Required tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Before performing service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

After performing service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Common fasteners. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

Parts removal order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

User-replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

ADF input tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

ADF pickup roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

ADF separation roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76

ADF separation pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

ADF unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

Assemblies and covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Control-panel door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Scan-unit right-side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

Copy processor board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

Scan-unit left-side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Intake fan filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Formatter cage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Scan unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

Printing-unit top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

Glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Scanning lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

Optical unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95

ADF door open sensor (PS10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

Optical-unit drive gear/motor assembly . . . . . . . . . . . . . . . . . . . . . . . .99

Scan-unit power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101

Inverter PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103

Scanner controller PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Intake fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106

C9148-90909 Table of contents 5

7 Troubleshooting

Troubleshooting process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Preliminary operating checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Installation conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Media condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Unit condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Basic troubleshooting process flow. . . . . . . . . . . . . . . . . . . . . . . . . . 113

Basic troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Power-on defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Troubleshooting with the control panel. . . . . . . . . . . . . . . . . . . . . . . . . . 117

Control-panel display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Event log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Print the event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Interpret the event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Display the event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Control-panel messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Troubleshooting with the copy processor board . . . . . . . . . . . . . . . . . . 124

User-level and service-level diagnostics . . . . . . . . . . . . . . . . . . . . . . . . 126

ADF paper-path test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

To print a paper-path test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Diagnostic tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

To perform a diagnostic test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Service-level diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Service menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

To access the service menu (PIN code: 04410002) . . . . . . . . . . 127

Jam troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Jams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Clearing repeated ADF jams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Creating a customer print job . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Evaluate the information pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Configuration page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Configuration-page elements . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

JetDirect page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

JetDirect-page elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Supplies status page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Supplies-page elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Usage page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

File directory page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

File-directory-page elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

Image-formation troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Checking the print cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

EconoMode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Image-defect tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Media troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Isolate a paper path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Use the straightest paper path. . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Isolate the source of the jam . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Determine where media jams occur . . . . . . . . . . . . . . . . . . . . . . 140

Is the MFP is misfeeding or creating multifeed jams . . . . . . . . . . 140

Isolate a media brand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Isolate a media type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

6 Table of contents C9148-90909

8 Parts and diagrams

Ordering parts, supplies and getting support. . . . . . . . . . . . . . . . . . . . . .144

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Related documentation and software . . . . . . . . . . . . . . . . . . . . . . . .144

Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145

Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145

Common hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

HP Laserjet 4100 differences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146

How to use the parts lists and diagrams . . . . . . . . . . . . . . . . . . . . . . . . . 147

Parts lists and diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148

Alphabetical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162

Numerical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164

Index

C9148-90909 Table of contents 7

8 Table of contents C9148-90909

List of figures

Figure 1. Model and serial number label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 2. Product parts (front view; right side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 3. Optical-unit lock (front view; left side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 4. Product parts (back view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 5. Major assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 6. Using the ADF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 7. Using the glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 8. Control panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 9. Navigation buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 10. Top-level control-panel menu display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 11. MFP menu map 1 of 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 12. MFP menu map 2 of 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 13. Open the delivery-guide cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 14. Remove the clear plastic sheet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 15. Replace the clear, plastic sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 16. Sample calibration target page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Figure 17. Manual calibration registration lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Figure 18. MFP block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Figure 19. Scan-unit components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Figure 20. ADF-unit components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Figure 21. Copy processor board components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 22. Copy processor board LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Figure 23. Scanner controller board connectors (shield off). . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 24. Power-supply block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 25. Optical unit block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 26. Scanning process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 27. Signal conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Figure 28. Document transport path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Figure 29. Release the ADF input-tray hinge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Figure 30. Remove the ADF input tray. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Figure 31. Release the roller shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Figure 32. Remove the roller shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Figure 33. Remove the ADF pickup roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Figure 34. Remove the ADF separation roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Figure 35. Remove the ADF separation pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Figure 36. Replace the ADF separation pad spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Figure 37. Disconnect the cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Figure 38. Remove the ADF unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Figure 39. Remove the print cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Figure 40. Remove the control-panel wire-harness cover . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Figure 41. Disconnect the control-panel grounding strip . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Figure 42. Release the control-panel door-support pins . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Figure 43. Remove the control-panel door. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Figure 44. Remove the product serial- and model-number panel . . . . . . . . . . . . . . . . . . . . 81

Figure 45. Remove the right-side cover screw. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Figure 46. Remove the scan-unity right-side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Figure 47. Disconnect the ADF cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Figure 48. Disconnect the high-speed copy connect cable . . . . . . . . . . . . . . . . . . . . . . . . . 83

Figure 49. Remove the left-side screw. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

C9148-90909 List of figures 9

Figure 50. Gently pry the top edge of the left-side cover. . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Figure 51. Remove the scan-unit left-side cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Figure 52. Remove the intake filter.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Figure 53. Remove the formatter-cage cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Figure 54. Slide the formatter cage toward the back of the product . . . . . . . . . . . . . . . . . . 87

Figure 55. Disconnect the formatter high-speed copy connect cable . . . . . . . . . . . . . . . . . 88

Figure 56. Secure the optical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Figure 57. Disconnect the CPB cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Figure 58. Disconnect the scan unit cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Figure 59. Remove the scan unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Figure 60. Remove the top-cover rear-mounting screws . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Figure 61. Remove the printing-unit top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Figure 62. Remove the glass mounting screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Figure 63. Remove the glass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Figure 64. Note the cable routing pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Figure 65. Remove the scanning lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Figure 66. Scanning-lamp wire harness routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Figure 67. Release the optical unit ribbon cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Figure 68. Optical-unit ribbon-cable clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Figure 69. Release the tension-spring bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Figure 70. Remove the optical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Figure 71. Optical-unit drive-belt tension bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Figure 72. Optical-unit ribbon cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Figure 73. Remove the ADF door open sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Figure 74. Remove the optical-unit cover plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Figure 75. Remove the optical-unit drive gear/motor assembly . . . . . . . . . . . . . . . . . . . . . 100

Figure 76. Remove the power-supply shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Figure 77. Remove the power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Figure 78. Remove the inverter PCB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Figure 79. Unplug the connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Figure 80. Grasp the scanner controller PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Figure 81. Remove the scanner controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Figure 82. Remove the fan mounting screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Figure 83. Remove the intake fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Figure 84. Correctly orient the intake fan and bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Figure 85. Basic troubleshooting flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Figure 86. Sample MFP event-log page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Figure 87. Control-panel display of the event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Figure 88. Copy processor board LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Figure 89. Sample configuration page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Figure 90. Sample JetDirect page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Figure 91. Sample supplies status page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Figure 92. Sample usage page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Figure 93. Sample file-directory page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

Figure 94. Wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Figure 95. Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Figure 96. Top-cover assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

Figure 97. Scan unit (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Figure 98. Scan unit (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

Figure 99. Glass, formatter,CPB, and cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Figure 100. ADF unit (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Figure 101. ADF unit (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

10 List of figures C9148-90909

List of tables

Table 1. Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 2. Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 3. ADF/flatbed-unit acoustical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 4. Skew specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 5. Supported paper sizes and weights for the ADF . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 6. General cleaning guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 7. User-replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 8. Print-unit maintenance kit parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 9. Copy processor board LEDs (initialization sequence) . . . . . . . . . . . . . . . . . . . . . 59

Table 10. Scanner controller board connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Table 11. Low-voltage components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Table 12. Common fasteners found in the MFP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Table 13. Parts-removal tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Table 14. Primary steps for troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Table 15. Basic troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Table 16. Power malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Table 17. Firmware-update event-log errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Table 18. Control-panel error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Table 19. Troubleshooting copy processor board LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Table 20. Service menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Table 21. General ADF jam troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Table 22. Image-quality checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Table 23. Image defects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Table 24. Technical support websites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Table 25. Accessories and supplies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Table 26. Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Table 27. Screws used in the ADF unit and scan unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Table 28. HP LaserJet 4100 differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Table 29. Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Table 30. Top-cover assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Table 31. Scan unit (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Table 32. Scan unit (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Table 33. Glass, formatter, CPB, and cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Table 34. ADF unit (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Table 35. ADF unit (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Table 36. Alphabetical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Table 37. Numerical parts list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

C9148-90909 List of tables 11

12 List of tables C9148-90909

1 Product Information

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Product configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

HP LaserJet 4100mfp (C9148A). . . . . . . . . . . . . . . . . . . . . . . . . . . 14

HP LaserJet 4101mfp (C9149A). . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Product features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Product speed and throughput . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Image quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Paper handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Copying capability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Expandable design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Product specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Media specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Special considerations for ADF documents . . . . . . . . . . . . . . . . . . 18

Supported media for the glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Model and serial numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Product overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Front view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

C9148-90909 1 Product Information 13

Introduction

With the HP LaserJet 4100 series multifunction printer (MFP), a workgroup can print, make copies, and send digital documents using a single device. Multiple functions can occur simultaneously in the MFP.

This service manual is an addendum to the HP LaserJet 4100 series printer service manual. The HP LaserJet 4100mfp can be upgraded to the HP LaserJet 4101mfp by ordering the

following parts:

• one additional 500-sheet media input tray (C8055A)

• duplex printing accessory (for automatic two-sided printing (C8054A)

• digital sending software (C7140A)

Note The terminology used in this manual contains minor differences from the HP LaserJet 4100 series

printer service manual. These differences reflect changes made since the publication of the HP LaserJet 4100 series printer service manual.

Product configurations

The HP LaserJet 4100mfp series is available in two configurations.

HP LaserJet 4100mfp (C9148A)

● 64 MB RAM; 5 GB (or larger) hard disk for RIP ONCE, transmit and scan once; job retention;

and font, form, and signature storage

● HP Jetdirect 10/100 Base-TX print server card for network connection

● 100-sheet media input tray

● 500-sheet media input tray

● automatic document feeder (ADF) with 30-sheet capacity

● embedded scan to e-mail

HP LaserJet 4101mfp (C9149A)

● all of the features of the HP LaserJet 4100mfp listed above

● one additional 500-sheet media input tray

● a duplex printing accessory (for automatic two-sided printing)

● HP digital-sending service software version 3.0 (or later)

• full send-to-e-mail capability

• SMTP mail service support

• Lightweight Directory Access Protocol (LDAP) compatibility

Note The HP LaserJet 4101mfp is available only in the United States and Canada.

14 Product Information C9148-90909

Product features

Product speed and throughput

● copying of letter-size media at 25 pages per minute (ppm) or A4-size media at 24 ppm

● monochrome scanning of letter-size originals at 25 ppm or A4-size originals at 24 ppm, and

color scanning at 8 ppm

● instant-on fuser

● scan-once copying

● RIP ONCE copy capability

● scan-ahead capability to start copying or sending while the printer is busy

● monthly duty cycle of 150,000 pages

Image quality

● FastRes 1200: 1200 dots per inch (dpi) print quality for fast, high-quality printing of business

text and graphics

● copying and scanning at a resolution of 600 pixels per inch (ppi)

● up to 256 levels of gray for smooth, photo-like images

● HP print cartridge for crisp, sharp output

Paper handling

● HP LaserJet 4100mfp: the 100-page and 500-page input trays are standard

● HP LaserJet 4101mfp: the 100-page and two 500-page input trays are standard

● capable of copying on a wide range of media sizes, types, and weights

● expandable to hold up to 1600 sheets of media

● standard 250-sheet face-down output

● duplexing (standard on the HP LaserJet 4101mfp)

● glass, which can accommodate media sizes up to letter/A4 size

● ADF with 30-page capacity to handle media sizes up to legal size

Copying capability

● easy-to-use copy functionality

● document collation

● multiple copies

● multiple pages per sheet (n-up)

● document reduction and enlargement

• ADF: 25 percent to 200 percent in one-percent increments (in ten-percent increments when the

• Flatbed glass: 25 percent to 400 percent in one-percent increments (in ten-percent increments when the

● automatic page-to-page enlargement or reduction

● image-quality improvement through background removal, best-quality mode, and contrast

adjustment

REDUCE or ENLARGE button is held down)

C9148-90909 1 Product Information 15

Expandable design

● stackable 500-sheet trays (up to two additional trays can be added to the HP LaserJet

4100mfp, and one additional tray can be added to the HP LaserJet 4101mfp)

● duplex printing accessory (standard with the HP LaserJet 4101mfp)

● HP Fast InfraRed printing adapter (FIR port)

● digital-sending service software (standard with the HP LaserJet 4101mfp)

● expandable memory through installation of additional dual inline memory modules (DIMMs)

Product specifications

Table 1. Physical specifications

4100mfp (print unit, scan unit, and ADF unit)

Height 637 mm (25.1 inches) Depth 520.7 mm (20.5 inches) Width 805 mm (31.7 inches) Weight 26 kg (56.5 pounds)

Scan unit only

Height 140 mm (5.6 inches) Depth 540 mm (21.6 inches) Width 415 mm (16.6 inches) Weight approximately 5 kg (11.1 pounds)

ADF unit only

Height 152 mm (6.1 inches) Depth 344 mm (13.8 inches) Width 415 mm (16.6 inches) Weight approximately 3 kg (6.4 pounds)

Table 2. Performance

Category Specification

Scanning speed (ADF mode) 139 mm/second (5.6 inches/second) Scanning speed (flatbed mode) 69 mm/second (2.8 inches/second) Copy speed 25 ppm (letter)

24 ppm (A4)

Copy resolution 600 by 600 ppi optical Digital send resolution 600 by 600 ppi optical

16 Product Information C9148-90909

Table 3. ADF/flatbed-unit acoustical specifications

Category Specification

Sound Po wer Level, L (1 bel = 10 decibels)

WAd

● Scanning: 6.7 dB (A)

● Standby: 5.2 dB (A)

Note Testing per International Standard Organization (ISO) 9296.

Note “Operating” means that the product is copying and printing continuously at 25 ppm. Values are

subject to change. See http://www.hp.com/lj4100mfp for current information.

Table 4. Skew specifications

Print unit

Tolerance Cut paper Envelope

Skew 1.5 mm (.03 inch) over 260 mm (10.24

inches) length---simplex

1.50 mm (.03 inch) over 260 mm (10.24 inches) length---duplex

First line leading edge

Left margin 5.0 mm (.20 inch) +/- 1.5 mm (.06 inch) 15mm (.59 inch) +/- 4.5 mm (.18 inch) Text stretching 1 percent for cut sheet---simplex

6.0 mm (.24 inch) +/- 2mm (.08 inch) 15mm (.59 inch) +/- 4.5 mm (.18 inch)

1 percent for cut sheet---duplex

6.0mm (.24 inch) over 220mm (8.66 inches) length

None

Scan unit

Tolerance ADF Glass

Skew <= 1 percent <= 1 percent Leading edge +/- 2 mm (.08 inch) +/- 1 mm (.04 inch) Left margin +/- 1 mm (.04 inch) +/- 1 mm (.04 inch) Parallel (vertical

and horizontal) Image length and

width

+/- 0.6 percent +/- 0.6 percent

+/- 1.2 percent +/- 1 percent

C9148-90909 1 Product Information 17

Media specifications

Note This section refers to the MFP only. See the HP LaserJet 4100 series printer service manual for

printing specifications, or see the Print Media Guide for the HP LaserJet printer family requirements.

Table 5. Supported paper sizes and weights for the ADF

Size Dimensions Weight

Letter 216 by 279 mm

(8.5 by 11 inches)

A4 210 by 297 mm

(8.3 by 11.7 inches)

Legal 216 by 356 mm

(8.5 by 14 inches)

50 to 105 g/m (13 to 28 lb)

for general

Custom sizes Minimum:

148.5 by 210 mm (5.9 by 8.3 inches Maximum:

215.9 by 355.6 mm (8.5 to 14 inches)

60 to135 g/m2 (16 to 36 lb)

Special considerations for ADF documents

● Documents must be free of tears or perforations.

● Documents must be square or rectangular and in good condition (not fragile or worn).

● Documents must be free of glue, correction fluid, or wet ink.

● Remove sticky notes, tape flags, staples, and paper clips.

● Multipart forms cannot be used in the ADF.

Supported media for the glass

The glass can accommodate the following types of media:

● letter- or A4-size and smaller originals, books, manuals, receipts, and similar documents

● irregular and worn documents, stapled documents, and photographs

● multiple-page letter-size documents

18 Product Information C9148-90909

Model and serial numbers

The model number and serial number are listed on an identification label located underneath the control panel door.

The serial number contains information about the country/region of origin, product revision level, production code, and production number of the product.The label also contains power rating and regulatory information.

Figure 1. Model and serial number label

Note If the control panel fails, the model and serial number label panel must be removed (see “Control-

panel door” on page 79) and installed on the replacement control panel.

C9148-90909 1 Product Information 19

Product overview

Front view

Figure 2. Product parts (front view; right side)

1 automatic document feeder (ADF) input (with sliding media guides) 2 ADF cover (lifts for access to the glass) 3 control-panel door (provides access to the print cartridge; serial and model numbers are

located on a panel underneath the door)

4 control panel 5 output bin (for printed output and copies)

Figure 3. Optical-unit lock (front view; left side)

6 optical-unit lock

20 Product Information C9148-90909

Back view

Figure 4. Product parts (back view)

1 ADF connector cable 2 straight-through output door 3 power connection (from power source to print unit) 4 hard disk 5 HP JetDirect card 6 memory access door (more than one DIMM can be installed)

7 power jumper cable (from print unit to scan unit) 8 ADF output bin

C9148-90909 1 Product Information 21

22 Product Information C9148-90909

2 Service approach

Service approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Major assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Contact HP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Contact HP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

World Wide Web. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

HP support assistant CD-ROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

HP authorized resellers and support . . . . . . . . . . . . . . . . . . . . . . . 25

HP service agreements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2 Service approach 23

Service approach

Repair of the printer normally begins with a three-step process: 1 Isolate the problem to the major system (the host computer, the network and/or server, or

MFP major assemblies).

2 Determine whether the problem is located in one of the paper-handling devices or in the

product engine.

3 Troubleshoot the problem using the procedures in the troubleshooting chapter of this

manual. See “Troubleshooting” on page 109.

Major assemblies

When a faulty part is identified, repair is usually accomplished by assembly-level replacement of field replaceable units (FRUs). Some mechanical assemblies can be repaired at the subassembly level. Hewlett-Packard does not support replacement of components on the printed circuit boards (PCBs).

Figure 5. Major assemblies

1 automatic document feed (ADF) unit 2 scan unit 3 print unit

24 Servic e appr o ach C9148-90909

Contact HP

World Wide Web

Printer drivers, updated HP printer software, and product and support information can be obtained from the following websites:

● U.S., http://www.hp.com/support/lj4100

● Europe, http://www.hp.com/support/lj4100

● China, ftp://www.hp.com.cn/support/lj4100

● Japan, ftp://www.jpn.hp.com/support/lj4100

● Korea, http://www.hp.co.kr/support/lj4100

● Taiwan, http://www.hp.com.tw/support/lj4100,

or the local driver website, http://www.dds.com.tw

HP support assistant CD-ROM

This support tool offers a comprehensive online information system designed to provide technical and product information about Hewlett-Packard products. T o subscribe to this quarterly service in the U.S. or Canada, call (1) (800) 457-1762. In Hong Kong, Indonesia, Malaysia, or Singapore, call Mentor Media at (65) 740-4477.

HP authorized resellers and support

To locate HP authorized resellers and support, call (1) (800) 243-9816 in the U.S. or (1) (800) 387-3867 in Canada

HP service agreements

Call (1) (800) 743-8305 in the U.S. or (1) (800) 268-1221 in Canada.

C9148-90909 2 Service approach 25

26 Servic e appr o ach C9148-90909

3 Operation

Using the ADF unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

General guidelines for using the ADF unit . . . . . . . . . . . . . . . . . . . 28

Using the glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

General guidelines for using the glass . . . . . . . . . . . . . . . . . . . . . . 29

Using the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Layout and operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Navigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Walk-up copy display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Status bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Menus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Configure device, diagnostic, and service menus . . . . . . . . . . 32

Menu map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3 Operation 27

Using the ADF unit

The automatic document feeder (ADF) is a fast, convenient way to feed multiple-page originals for copying or digital-sending. You can load the ADF with as many as 30 sheets of paper. The ADF accepts documents that meet the following specifications:

● single-sided or double-sided originals

● documents on standard letter-size, A4-size, and legal-size paper

● documents ranging in size from 148.5 by 210.0 mm (5.9 by 8.3 inches) to 215.9 by

355.6 mm (8.5 by 14.0 inches)

● documents ranging in weight from 50 to 105 g/m

● documents that are free of tears or perforations

● documents that are square or rectangular and in good condition (not fragile or worn)

● documents that are free of glue, correction fluid, wet ink, sticky notes, tape flags, staples, or

paper clips

CAUTION Do not use multipart forms.

The ADF transports the original document through the ADF paper path. Copies made using the ADF are delivered to the output bin beneath the scan unit.

General guidelines for using the ADF unit

(16 to 28lb)

Figure 6. Using the ADF

Note The source documents must be placed in the ADF input with the side you intend to copy facing up.

1 Before placing documents in the ADF, prepare the documents by doing the following:

• flatten curls or wrinkles

• remove staples, paper clips, sticky notes, and similar materials

2 Place documents in the ADF input tray. 3 On the control panel, select the sending or copying options you want to use. See the “Walk-

up copying” and “Sending to e-mail ” sections in the use guide for information about these functions.

4 After making your selections, press

START. Copies are sent to the output bin beneath the

scan unit.

5 When the scan is complete, remove the original document from the ADF output.

28 Operation C9148-90909

Using the glass

You can also use the digital-sending and copying features by using the glass, located below the ADF. The glass can accommodate letter- or A4-size and smaller originals, books, manuals, receipts, and similar documents. Irregular and worn documents, stapled documents, and photographs can also be easily sent or copied using the flatbed.

General guidelines for using the glass

Figure 7. Using the glass

1 Open the ADF cover and place the original document face-down on the glass. Lower the

cover.

2 On the control panel, select the sending or copying options you want to use. See the “Walk-

up copying” and “Sending to e-mail” sections in the use guide for information about these functions.

3 After making the selections, press

flatbed.

4 When the scan is complete, remove the original document from the glass.

START. Copies are sent to the output bin beneath the

C9148-90909 3 Operation 29

Using the control panel

Layout and operation

Figure 8. Control panel

1 ? (Help): provides Help files that contain information about the control-panel display when

problems occur.

2 Control-panel display. 3 Navigation buttons: four arrow buttons that are used to move among elements on the

control-panel display. Use the central menu.

3 4

SELECT ( ) button to choose an element or enter a

4 C (Clear): resets the copy count or other numeric entries. 5

MENU: use to choose device configuration menus on the control panel.

6 Status lights: Ready light, Data light, and Attention light. 7 Light and dark buttons: use to increase or decrease the brightness of the copy image 8

REDUCE and ENLARGE buttons: use to scale the copy size.

RESET: returns all current job settings to their default values.

STOP: cancels a copy job, digital send job, or print job.

START: begins or resumes a job.

12 Numeric keypad and keyboard: the keypad is used to type numerical values. The keyboard is

used for digital-sending features and for typing other data.

Hint If the MFP is put into a paused mode (see “Menu map” on page 33), the control panel displays

the message Paused at the top of the display. To return the MFP to the ready mode, press

and then use the navigation buttons (callout 3) to highlight RESUME on the control-panel display. Press the

SELECT ( ) button. The message displayed on the control panel changes from Paused

to Ready. The MFP paused mode is not the same as PowerSave mode. When the MFP is in PowerSave

mode, the control-panel displays the message P

OWERSave On at the top of the display. When in

PowerSa ve mode, pressing any key or button on the control panel will return the MFP to the ready state.

30 Operation C9148-90909

Navigation

By pressing the arrow navigation buttons, you can shift focus between objects on the controlpanel display to describe the document to be handled and the actions to be performed. A bold border around a graphic object or a reverse video effect in a text list indicates the current focus. Use the central

SELECT ( ) button to select menus.

Figure 9. Navigation buttons

Walk-up copy display

Use the walk-up copy display menu on the control-panel display to describe the original document and to specify the actions to be taken and their parameters. The primary walk-up copy display menu choices are:

● Describe Original

● Copy Settings

● Send Options

After power is turned on the MFP initializes and the top-level menu display appears when the MFP is ready to process jobs.

Select

Move left

Move up

Move right

Move down

Figure 10. Top-level control-panel menu display

The Describe Original menu is used for both digital-sending and copying. The other menus are addressed in the “Walk-up copying” and “Sending to e-mail” sections in the use guide.

Status bar

The status bar is the uppermost line of available text on the control-panel display.

● The status line shows both product-status messages and user prompts. When the product is

idle, this line displays Ready To Copy, Accepting Copy Jobs, or Ready. During scanning, the line might read Scanning Page x. During copying, you might see Data Recieved Processing Job. Error messages are not communicated on the status line, but they appear in a text box overlay that blocks normal display views until the message is cleared.

● The copy count shows the number of copies selected. This selection is made using the

keypad. Acceptable values are from 1 to 99.

C9148-90909 3 Operation 31

Menus

The HP LaserJet 4100mfp series uses a system of control-panel menus to set job parameters, set system defaults, and manage product performance and features. Menu options are reached by pressing the the list to locate the option you want to use. The following menus are available.

● Pause/Resume (see Hint on page 30)

● Retrieve job

● Information

● Paper handling

● Configure device

● Diagnostic

● Service (PIN code: 04410002)

For more information about menus, see “Control panel and control panel menus” in the use guide.

Configure device, diagnostic, and service menus

The configure device menu is used to establish the product’s default settings. The selected defaults can be locked by the system administrator. You can override the default settings at the control panel for the current job only. It might be necessary to reset these options to factory defaults when troubleshooting the MFP unit.

MENU button on the right side of the control-panel display and scrolling through

The diagnostic menu is used to calibrate and test MFP components. The diagnostic menu can also be used to print or view an event log. An event log records the number and type of errors the product has experienced.

The service menu is used by HP-authorized service representatives only and is protected by an eight-digit personal identification number (PIN). See “Service menu” on page 127. The service menu can be used to verify the serial number of the MFP unit.

32 Operation C9148-90909

Menu map

The menu map is a graphical representation of the MFP menus. Press the MENU button on the control panel to gain access to the main menu display . For more information about navigating the menus, see “Navigation” on page 31.

Note Default settings shown in bold.

Figure 11. MFP menu map 1 of 2

C9148-90909 3 Operation 33

Menu map, continued

Figure 12. MFP menu map 2 of 2

34 Operation C9148-90909

4 Maintenance

Cleaning the product. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

General guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Running the cleaning page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Cleaning the ADF delivery guide (clear mylar strip) . . . . . . . . . . . . 37

User-replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Replacing user-replaceable parts. . . . . . . . . . . . . . . . . . . . . . . . . . 39

Updating product firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Downloading a remote firmware update. . . . . . . . . . . . . . . . . . . . . 41

Installing the update. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

RFU installation messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Using HP Web JetAdmin (single update). . . . . . . . . . . . . . . . . 42

Using HP Web JetAdmin (multiple or unattended update). . . . 42

Windows parallel connection (local printer) . . . . . . . . . . . . . . . 43

Windows parallel connection (network printer) . . . . . . . . . . . . 43

Troubleshooting RFU installation . . . . . . . . . . . . . . . . . . . . . . . . . . 44

RFU installation error messages . . . . . . . . . . . . . . . . . . . . . . . 44

Performing hard-drive disk initialization . . . . . . . . . . . . . . . . . . . . . 45

NVRAM initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Performing automatic Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Performing manual calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Lead adjustment for the ADF . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Center adjustment for the ADF . . . . . . . . . . . . . . . . . . . . . . . . 49

Leading-edge adjustment for the glass . . . . . . . . . . . . . . . . . . 49

Side-edge adjustment for the glass . . . . . . . . . . . . . . . . . . . . . 50

C9148-90909 4 Maintenance 35

Cleaning the product

General guidelines

Perf orm the following cleaning procedures when you change the print cartridge or when printquality problems occur. To minimize problems, keep the product free from dust and debris.

WARNING! T urn the main power-switch off and unplug the MFP power cord before you disconnect any cables

or accessories, and before you perform preventative maintenance or cleaning. Failure to follow this warning can result in serious product damage or personal injury.

CAUTION While cleaning the product, do not to touch the transfer roller (the black rubber roller located

underneath the print cartridge). Skin oils on the roller can affect print quality.

Table 6. General cleaning guidelines

Part Cleaning interval Cloth Solvent

Covers Clean when visibly dirty . Soft, tight weave; lint-free. Water (ad d a mild dete rgent if

desired). See caution below.

Control panel Clean when dusty or when

fingerprints build up.

ADF rollers Clean if the user is experiencing

misfeeds, or multipage feeds, or if documents are skewing when traveling through the ADF.

Glass Clean when visibly dirty or if the

user is experiencin g poor co py quality such as blurriness or streaking.

Whiteboard cover (white vinyl backing located on the bottom of the ADF cover)

Clear mylar sheet (ADF delivery guide)

Clean when visibly dirty. Soft, tight weave; lint-free. Ammonia-based cleaner or

Clean when visibly dirty or if the user is experiencin g poor co py quality such as blurriness or streaking.

Soft, tight weave; lint-free. Water. See caution below.

Soft, tight weave; lint-free. Ammonia-based cleaner or

water. See caution below.

Soft, tight weave; lint-free. Water. See caution below.

CAUTION T o prevent damage, do not pour or spray cleaning solvents directly onto MFP components. Spray

water or cleaning solvent onto a cloth and wipe down components that need cleaning. Because some MFP components should never be exposed to ammonia fumes, use ammonia-based cleaners sparingly and only where indicated.

36 Maintenance C9148-90909

Running the cleaning page

Run the cleaning page to keep the fuser free of toner and paper particles. Accumulation of toner and particles can cause specks to appear on the front-side or back-side of your jobs. It is recommended that you either use the cleaning page every time you replace the print cartridge or that you establish an automatic cleaning schedule.

You can run a cleaning page in two ways:

● automatically at an interval that you establish

● manually as needed from the control panel

For information about these procedures, see the HP LaserJet 4100 series printer service manual.

1 Access the Configure Device menu. See “Menus” on page 32. 2 Select Print Quality. 3 Select Create Cleaning Page and follo w the instruction on the page.

Cleaning the ADF delivery guide (clear mylar strip)

1 Raise the ADF unit. 2 Open the delivery-guide cover by pressing in the small plastic handles on either side of the

delivery guide.

Figure 13. Open the delivery-guide cover

3 Remove the clear, plastic sheet (callout 1).

C9148-90909 4 Maintenance 37

Figure 14. Remove the clear plastic sheet

4 Use a clean, soft, dry cloth to wipe the surface of the clear plastic sheet (do not use an

ammonia based cleaner.

5 Reinstall the clear, plastic sheet by sliding its leading edge under the gray ribbed guide

(callout 2), which is located under the white padded sheet.

6 Align the holes in the sheet with the small plastic spindles (callout 3) in the delivery guide.

Press the clear, plastic sheet down onto the spindles.

Figure 15. Replace the clear, plastic sheet

Note Make sure that the free end of the clear, plastic sheet (part number RB2-8793-000CN) is tucked

behind the gray ribbed guide and the white padded sheet.

7 Close the delivery-guide cover. The cover is properly closed when you hear the delivery-

guide cover plastic handles click into place.

8 Wipe the outside surface of the delivery guide with the cloth.

38 Maintenance C9148-90909

User-replaceable parts

Replacing user-replaceable parts

To ensure that the product maintains optimal performance, replace certain parts when the Perform Printer Maintenance message appears on the product control-panel display.

The maintenance message appears every 200,000 pages (default setting). To check the number of pages the product has printed, either print a configuration page or a supplies status page. See

“Evaluate the information pages” on page 130.

Hint To order a print-unit maintenance kit, see the HP LaserJet 4100 series printer service manual.

Note Unless they are damaged, the ADF pickup roller, separation roller, and separation pad should not

need to be replaced.

Table 7. User-replaceable parts

MFP Item Procedure Interval

ADF unit See “ADF unit” on page 78. User replaceable. As

required.

ADF input tray See “ADF input tray” on page 73. User replaceable. As

required.

ADF delivery guide (clear mylar strip)

ADF pickup roller See “ADF pickup roller” on page 74. User replaceable. As

ADF separation roller See “ADF separation roller” on page 76. User replaceable. As

ADF separation pad See “ADF separation pad” on page 77. User replaceable. As

ADF separation assembly compression spring

ADF pick/feed cover See “ADF separation pad” on page 77

ADF delivery guide holde r (cle ar mylar sheet holder)

See the removal step in “Cleaning the

ADF delive ry guide (cl ear mylar strip)” on page 37.

See “ADF separation pad” on page 77 and “ADF unit (2 of 2)” on page 160.

and “ADF unit (2 of 2)” on page 160.

See the step in “Cleaning the ADF

delivery guide (clear mylar strip)” on page 37 and “ADF unit (1 of 2)” on page 158.

User replaceable. As required.

required.

User replaceable. As required.

ADF face-up bin handle See “Covers” on page 148. User replaceable. As

required.

5GB hard disk drive To locate the hard drive, see “Back view”

on page 21.

User replaceable. As required.

C9148-90909 4 Maintenance 39

Table 7. User-replaceable parts (continued )

MFP Item Procedure Interval

HP JetDirect network card To locate the HP JetDirect network card,

see “Back view” on page 21.

Memory DIMM To locate the memory DIMM, see “Copy

processor board” on page 57.

Firmware DIMM To locate the memory DIMM, see “Copy

processor board” on page 57.

Power jumper cable To locate the power jumper cable, see

“Back view” on page 21.

Print cartridge See the HP LaserJet 4100 series printer

service manual.

User replaceable. As required.

About ev ery 10,000 pages for print cartridge part number C8061X.

About ev ery 6000 pages f or print cartridge part number C8061A.

Table 8. Print-unit maintenance kit parts

MFP Item Procedure Interval

Print-unit transfer roller See the HP LaserJet 4100 series printer

service manual.

Print-unit feed rollers See the HP LaserJet 4100 series printer

service manual.

Print-unit separation pad See the HP LaserJet 4100 series printer

service manual.

Print-unit fuser See the HP LaserJet 4100 series printer

service manual.

User replaceable. See “Expected life of components” in the HP LaserJet 4100 series printer service manual.

40 Maintenance C9148-90909

Updating product firmware

Downloading a remote firmware update

The HP LaserJet 4100mfp product supports remote firmware updates (RFUs). The update is downloaded from the website http://www.hp.com/go/lj4100_firmware (downloading a firmware update is similar to downloading printing-system software and printer drivers).

This website also features an “E-mail me when new software is available” link. This feature notifies you by e-mail when a new firmware update version is available for the MFP. If you used HP WebReg to register your product, you are automatically sent an e-mail notification when a new firmware update version is available for the MFP.

Hint The RFU file on the website is a self-extracting .EXE file. Detailed instructions about how to

download the RFU file can be found at the website http://www.hp.com/go/lj4100_firmware.

The RFU process consists of three steps:

● Determine the version of firmware currently installed (print a configuration page; see

“Configuration page” on page 130). Look for the version information in the device information

section of the configuration page.

● Go to the website http://www.hp.com/go/lj4100_firmware website and download the update.

● Install the update.

Note For more information about remote firmware updates, contact your HP Customer Care Center

and ask for a software technical reference sheet (see “Support” on page 144).

Installing the update

CAUTION If a firmware update involves a change in the format on nonvolatile random-access memory

(NVRAM), any user-set settings (for example, configure device settings) revert to default settings. Before installing an updated version of the firmware, print any information pages required to reset user defined settings. See “Evaluate the information pages” on page 130.

Note To install a firmware update on a computer using the UNIX operating system, use any method

that delivers the .RFU file to the printer. For example, $cp/home/yourmachine/FILENAME/dev/ parallel where /home/yourmachine/FILENAME with substitutions for the locations that contain the location of the .RFU file.

RFU installation messages

During normal RFU installation the following three messages appear on the control-panel display.

● Recieving Upgrade

• This message appears from the time the printer recognizes the beginning of a .RFU file being sent until the time the printer verifies the validity and integrity of the .RFU file.

● Performing Upgrading For Help Press?

• This message appears while the printer is reprogramming the DIMM with the .RFU file information.

● Wait For Printer To Reinitialize

• This message appears from the time the printer finishes reprogramming the DIMM until the printer re-initializes.

C9148-90909 4 Maintenance 41

Using HP Web JetAdmin (single update)

Note This procedure requires Web JetAdmin version 6.1 or later. Download the update from the website

http://www.hp .com/go/lj4100_firmware and follow the steps below to update a single MFP product.

1 Start the HP Web JetAdmin program. 2 Enter the Internet protocol (IP) address or IP hostname of the printer in the

FIND FIELD, and click GO. The printer Status window appears.

3 Click the right arrow on the toolbar to display the 4 When prompted for the type of update, click 5 Under

UPLOAD NEW FIRMWARE IMAGE: click BROWSE to locate the .RFU file you downloaded

UPDATE button. Click the UPDATE button.

UPDATE PRINTERS, and then click CONTINUE.

QUICK DEVICE

from the website http://www.hp.com/go/lj4100_firmware.

6 Click

UPLOAD to move the .RFU file from your hard drive to the HP Web JetAdmin server.

Refresh the browser.

7 Select the .RFU file from the 8 Click

UPDATE FIRMWARE. HP Web JetAdmin sends the selected.RFU file to the printer.

SELECT NEW FIRMWARE VERSION: drop-down menu.

Using HP Web JetAdmin (multiple or unattended update)

Note This procedure requires Web JetAdmin version 6.1 or later. Download the update from the website

http://www.hp.com/go/lj4100_firmware and follow the steps below to update multiple MFP products or perform an unattended installation.

1 Start the HP Web JetAdmin program. 2 Create a device group. One way to do this is:

• Click

• In the 3.

• Click

DEVICES on the 1. CHOOSE: drop-down menu. DEVICE MODEL from the 2. FILTER: drop-down menu.

CRITERIA (OPTIONAL): field, type your MFP model number (for example, 4100)

GO.

3 In the

DEVICE LIST, select the printers you want to include in the group and click CREATE

GROUP.

4 When prompted, type a name for the new device group, and then click 5 Click 6 When prompted for the type of update, click 7 From the list of HP printers, select the printers to be updated or click 8 Click

UPDATE.

UPDATE PRINTERS, and then click CONTINUE.

SELECT ALL.

UPDATE FIRMWARE. HP Web JetAdmin sends the selected .RFU file to the selected

printers.

OK.

42 Maintenance C9148-90909

Windows parallel connection (local printer)

Note Download the update from the website http://www.hp.com/go/lj4100_firmware and follow the

steps below to update the firmware on a non-shared local printer.

Hint The LaserJet 4100mfp series uses a type-B parallel cable to connect to a computer’s LPT1 port.

1 Open a MS-DOS command window. 2 Type copy /b path\filename portname at the comma nd prompt.

• pa th is the location the .RFU file was downloaded to

• filename is the name of the .RFU file downloaded from the website

• portname is the appropriate printer port (for example, LPT1)

3 Press the computer ENTER key. The .RFU file is sent to the printer.

Windows parallel connection (network printer)

Note Download the update from the website http://www.hp.com/go/lj4100_firmware and follow the

steps below to update the firmware on a network printer.

1 Open a MS-DOS command window. 2 Type copy /b path\filename\sharename\printername at the command prompt.

• pa th is the location the .RFU file was downloaded to

• filename is the name of the .RFU file downloaded from the website

• sharename is the name of the computer from which the printer is shared (host computer)

• printername is the printer share name

3 Press the computer’s ENTER key. The .RFU file is sent to the printer.

C9148-90909 4 Maintenance 43

Troubleshooting RFU installation

RFU installation error messages

The following messages can appear on the control-panel display if the installation is interrupted for some reason. Turn the MFP power off, and then back on again. Attempt the RFU installation again.

Hint If the update is not successful but an error message does not appear on the control-panel display

check the event log for RFU error codes. See “Firmware-update event-log errors” on page 119.

● Job Canceled From Printer Control Panel

• No update occurred. Turn the MFP power off, and then back on again. Attempt the RFU installation again.

● Break In I/o Stream During Send (for example the parallel cable was removed)

• No update occurred. Turn the MFP power off, and then back on again. Attempt the RFU installation again.

● Power Cycle Occurred During Recieving Upgrade

• No update occurred. Turn the MFP power off, and then back on again. Attempt the RFU installation again.

● Power Cycle Occurred During Upgrading Printer

• No update occurred. Turn the MFP power off, and then back on again. Attempt the RFU installation again.

● Power Cycle Occurred During Wait For Printer To Reinitialize

• Update was completed (no action required).

● .RFU File Is Corrupt

• The printer recognizes that the RFU file is damaged (corrupted) and rejects the update. Download a new RFU file from the website http://www.hp.com/go/lj4100_firmware. Turn the MFP power off, and then back on again. Attempt the RFU installation again.

● Wrong Printer Model Contained In The .RFU File

• The printer recognizes that the RFU file is not correct for installation to the intended MFP product and rejects the update. Download the correct RFU file from the website http:// www.hp.com/go/lj4100_firmware. Turn the MFP power off, and then back on again. Attempt the RFU installation again.

● Update Was Interrupted

• See the information about the job canceled, break in I/O, and power cycle error messages in this section.

● Flash Hardware Failure Occurred

• The flash DIMM has failed. Replace the flash DIMM on the formatter.

Hint The HP LaserJet 4100mfp product contains a backup copy of the latest version of firmware on

the flash DIMM. If a RFU update fails, the MFP uses this backup copy of the firmware to restart. Then attempt to install the update again. When the MFP starts using the backup copy of the firmware, some mfp capabilities are not functional (for example, copying or digital sending). A successful update must be accomplished to fully restore MFP functions.

44 Maintenance C9148-90909

Performing hard-drive disk initialization

Before performing hard-drive initialization, print the following MFP information pages. Use these pages to reset any menu settings that the user has changed from factory defaults.

• Configuration page (see “Evaluate the information pages” on page 130).

• File directory page (see “Evaluate the information pages” on page 130).

1 Turn the product power off. 2 Press and hold down the

the

START button until the printer initializes and the three control panel LEDs illuminate

continuously. Release the

3 Press and release the

START button. Turn the product power on. Continue to hold down

START button.

LEFT navigation button. The message INITIALIZE DISKS appears on

the control-panel display.

4 Press and release the

SELECT ( ) button. Two rows of asterisks appear on the control-panel

display.

5 When the astericks disappear and the message READY appears on the control panel display,

the mfp can process jobs.

Cold Reset

A cold reset clears all data from the printer memory and sets may of the defaults back to the factory setting s.

Before performing hard-drive initialization, print the following MFP information pages. Use these pages to reset any menu settings that the user has changed from factory defaults.

• Configuration page (see “Evaluate the information pages” on page 130).

• File directory page (see “Evaluate the information pages” on page 130).

1 Turn the product off. 2 Press and hold down the

SELECT ( ) button.

3 Turn the product on. 4 Continue to hold down the

the

SELECT ( ) button.

5 Press the

UP navigation button twice. The message COLD RESET will appear on the control

SELECT ( ) button until all three LEDs are illuminated. Release

panel display.

6 Press the

SELECT ( ) button once. The message STARTS will appear on the control panel

display.

7 When the cold reset is complete, the MFP will restart.

C9148-90909 4 Maintenance 45

NVRAM initialization

NVRAM initialization should be performed immediately after replacing the formatter board. Not initializing NVRAM might result in print quality defects.

CAUTION Initializing NVRAM erases several memory settings (for example, page count, printer serial

number, and the event log). This information is permanently lost.

Before performing NVRAM initialization print the following MFP information page. Use this page to reset any menu settings that the user has changed from factory defaults.

• Configuration page (see “Evaluate the information pages” on page 130).

1 Turn the product power off. 2 Press and hold down the

DOWN navigation button. Continue to hold the DOWN button down

until the printer initializes and the three control panel LEDs illuminate continuously. Release the

DOWN button.

3 Press and release the 4 Press and hold down the 5 Press and release the

UP navigation button.

START button.

UP navigation button. Release the START button. The message SKIP

DISK LOAD appears on the control panel display.

6 Press the

DOWN navigation button until the message NVRAM INIT appears on the control

panel display.

7 Press the

SELECT ( ) button. The NVRAM initialization process will begin.

8 When completed, the printer will initialize and the message READY will appear on the control

panel display. The MFP is ready to process jobs.

46 Maintenance C9148-90909

Calibration

Performing automatic Calibration

The MFP can be automatically calibrated to register scanned images correctly. When CALIBRATE SCANNER is selected from the diagnostic menu, the MFP prints a calibration target page.

Messages appear on the control panel with instructions about automatically calibrating the MFP.

1 Press the 2 Select DIAGNOSTICS. 3 Select CALIBRATE SCANNER. 4 Select CALIBRATE. 5 The message To Print Target Page On Paper Size: Letter. Press Start. To Quit,

Press Stop appears on the control-panel display. Press the calibration target page. While this page is printing, the message Target Page Printing To Quit, Press Stop appears on the control-panel display.

Note The paper size displayed in the message is the cold-reset paper size (either letter or A4).

6 When the message Load Target Page Face Up In Adf Clear Flatbed And Press Start

To Quit, Press Stop appears, place the target page in the ADF and press the button.

7 The target page is moved through the ADF paper path and automatic calibration begins. The

message calibration running do not raise cover appears on the control-panel display.

8 When calibration is over, the MFP returns to the ready mode (the message READY appears

on the control-panel display) and can process print and scan jobs.

MENU button.

START button to print the

START

Figure 16. Sample calibration target page

C9148-90909 4 Maintenance 47

Performing manual calibration

Manual calibration provides precise control of image placement. Vertical and horizontal image registry for both the ADF and the glass can be set individually. For example, changing the leading-edge adjustment for the ADF does not effect the leading-edge adjustment of the glass.

Note Manual calibration increment values are in pixels (600 pixels-per-inch). All values are positive

numbers. The center adjustment value 2670 represents an imaginary center line through the ADF . It may not be exactly centered due to mechanical tolerances between MFP units

Hint Before attempting to manually calibrate the MFP, first try the automatically calibrating procedure

(see “Performing automatic Calib ration” on page 47).

ADF lead adjustment

255

ADF center adjustment

2470

ADF

Control panel

Glass leading-edge adjustment

2870

ADF

Control panel

255

0,0

255

Glass left edge adjustment

Figure 17. Manual calibration registration lines

Lead adjustment for the ADF

Hint It might be helpful to reset the product settings to factory defaults before attempting manual

calibration. Be sure to print a configuration page before doing a setting reset so that any userdefined settings can be restored (see “Configuration page” on page 130).

1 Press the

MENU button.

2 Select DIAGNOSTICS. 3 Select CALIBRATE SCANNER. 4 Select LEAD ADJUSTMENT. 5 The message Lead Adjustment ### Range 0-255 appears on the control-panel display . Use

the numeric keypad to type a value for the leading-edge adjustment.

Hint Entering a lower value than current setting moves the image away from the leading edge (toward

the bottom of the page). Entering a higher value than the current setting moves the image toward the leading edge (toward the top of the page).

6 Press the

SELECT ( ) button to save the setting.

7 Use the ADF to scan a source document (use the calibration target page if you have already

automatically calibrated the MFP). Verify that the leading edge is correctly positioned on the output copy.

48 Maintenance C9148-90909

Center adjustment for the ADF

Hint It might be helpful to reset the product settings to factory defaults before attempting manual

calibration. Be sure to print a configuration page before doing a setting reset so that any userdefined settings can be restored (see “Configuration page” on page 130).

1 Press the

MENU button.

2 Select DIAGNOSTICS. 3 Select CALIBRATE SCANNER. 4 Select CENTER ADJUSTMENT. 5 The message Center Adjustment #### RANGE 2470-2870 appears on the control-panel

display. Use the numeric keypad to type a value for the center adjustment.

Hint Entering a lower value than current setting moves the image away from the left edge (toward the

right side of the page). Entering a higher value than the current setting moves the image toward the left edge of the page.

6 Press the

SELECT ( ) button to save the setting.

7 Use the ADF to scan a source document (use the calibration target page if you have already

automatically calibrated the MFP). Verify that the image is correctly positioned on the output copy.

Leading-edge adjustment for the glass

Hint It might be helpful to reset the product settings to factory defaults before attempting manual

calibration. Be sure to print a configuration page before doing a setting reset so that any userdefined settings can be restored (see “Configuration page” on page 130).

1 Press the

MENU button.

2 Select DIAGNOSTICS. 3 Select CALIBRATE SCANNER. 4 Select LEAD ADJUSTMENT GLASS. 5 The message Leading Edge Glass ### Range 0-255 appears on the control-panel display.

Use the numeric keypad to type a value for the leading-edge adjustment.

Hint Entering a lower value than current setting moves the image away from the leading edge of the

page (towards the bottom of the page). Entering a higher value than the current setting moves the image toward the leading edge (toward the top of the page).

6 Press the

SELECT ( ) button to save the setting.

7 Use the glass to scan a source document (use the calibration target page if you have already

automatically calibrated the MFP). Verify that the image is correctly positioned on the output copy.

C9148-90909 4 Maintenance 49

Side-edge adjustment for the glass

Hint It might be helpful to reset the product settings to factory defaults before attempting manual

calibration. Be sure to print a configuration page before doing a setting reset so that any userdefined settings can be restored (see “Configuration page” on page 130).

1 Press the

MENU button.

2 Select DIAGNOSTICS. 3 Select CALIBRATE SCANNER. 4 Select SIDE EDGE ADJUSTMENT GLASS. 5 The message Side Edge Glass ### Range 0-255 appears on the control-panel display. Use

the numeric keypad to type a value for the side-edge adjustment.

Hint Entering a lower value than current setting moves the image away from the left edge (toward the

right side of the page). Entering a higher value than the current setting moves the image toward the left edge of the page.

6 Press the

SELECT ( ) button to save the setting.

7 Use the glass to scan a source document (use the calibration target page if you have already

automatically calibrated the MFP). Verify that the image is correctly positioned on the output copy

50 Maintenance C9148-90909

5 Theory of operation

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Document transportation process. . . . . . . . . . . . . . . . . . . . . . . . . . 52

Document exposure system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Light-conversion process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

General descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Scan-unit components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

ADF components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Copy processor board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

CPB terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Typical scanning-process flow . . . . . . . . . . . . . . . . . . . . . . . . . 58

Copy processor board LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Scanner controller board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

ADF motor circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Optical-unit motor circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Scan-unit intake-fan motor circuit. . . . . . . . . . . . . . . . . . . . . . . 61

Scanner controller board connectors . . . . . . . . . . . . . . . . . . . . 62

Intermediate PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Overcurrent and overvoltage protection. . . . . . . . . . . . . . . . . . 63

Power-supply block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Optical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Inverter PCB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Scanning lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

CCD driver PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

ADF document-feed system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

ADF cover sensor (PS10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Document-detect sensor (PS2) . . . . . . . . . . . . . . . . . . . . . . . . 68

Leading-edge sensor (PS1) . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

ADF motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Document pickup process . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Document jams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Scan-unit intake fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

C9148-90909 5 Theory of operation 51

Introduction

Overview

This chapter presents an overview of the relationships between major components in the MFP. It also provides a general description of the following:

● mechanical systems (for example, the flatbed inta ke fan)

● electronic circuits (for example, the scanner controller circuit)

● sensors (for example, the document-detect sensor)

Scanning a document consists of three main processes. First, the document is transported through the ADF or manually placed on the glass. Second, the document is illuminated and the light is captured (the document-exposure process). Third, the captured light is converted to a digital signal and sent to the base printer for output (image processing).

When the copy processor board (CPB) receives a scan command from the control panel, it sends the command to the scanner controller board, which initiates and controls the scanning process.

These main components are used in the scanning process.

● scanner controller board (controls the scanning process and communication with the CPB)

● automatic document feeder (ADF) (transports the source document)

● optical unit (holds the scanning lamp and charged couple device [CCD])

● scanning lamp (exposes the document)

● charged-couple device (CCD) driver PCB (converts reflected light to digital RGB signals for

final out put)

Document transportation process

The ADF receives a signal from the scanner control PCB and begins to transport the document. A sensor in the ADF detects the document in the input tray. The ADF picks up the document. Then, the document travels through the ADF toward the flatbed. A second sensor in the ADF confirms that the document was successfully transported through the ADF. After the scanning process the document is transported to the ADF output.

Document exposure system

● The source document is loaded through the ADF.

After receiving the scan command from the copy processor board, the scanner controller board sends a signal to the scanning lamp in the optical unit. The lamp illuminates the document as the ADF passes the document past the optical unit (the optical unit does not move). A calibration strip mounted under the glass allows automatic document registration during the exposer process. The light is reflected from the scanning plate and is sent (by way of three mirrors and a lens) to the CCD driver PCB for image processing. The source document is deposited in the ADF output.

● The source document is manually placed on the glass.

After receiving the scan command from the copy processor board, the scanner controller sends a signal to the scanning lamp. The lamp illuminates the document as the optical-unit motor moves the optical unit down the length of the document. The light is reflected from the scanning plate and is sent (by way of three mirrors and a lens) to the CCD driver PCB for image processing. When the scanning process is complete, the optical unit returns to its home position.

52 Theory of operation C9148-90909

Light-conversion process

When the charged couple device receives the reflected light, it photo-electrically converts the light to three analog signals (red-green-blue, or RGB). These three signals pass through an analog-to-digital converter, and the resulting digital signals are sent to the scanner controller board. The scanner controller board sends the digital signals to the copy processor board, which initiates output through the base printer.

Note If the source document is manually placed on the glass, the scanning process is the same, except

for document transportation.

C9148-90909 5 Theory of operation 53

General descriptions

This section describes the individual MFP components and their roles in the scanning process. Figure

18 illustrates the relationship between the MFP components. Figure 19 illustrates the

flatbed-assembly component locations. Figure 20 illustrates the ADF-unit component locations. The following components are identified:

● scanner controller board

• CPU

• fan-motor drive circuit

• ADF drive motor circuit

• optical-unit motor circuit

• optical-unit home-position

sensor (PI1201)

● optical unit

• scanner motor

• inverter PCB

● power supply

● flatbed intake fan

● intermediate PCB

● ADF cover-open sensor

(PS10)

● ADF unit

• document-detect sensor (PS2)

• document leading-edge sensor (PS1)

• ADF drive motor

• scanning lamp

• pickup solenoid

• CCD driver PCB

The block diagram below illustrates the relationship among the MFP components.

Figure 18. MFP block diagram

54 Theory of operation C9148-90909

Scan-unit components

2 3

Figure 19. Scan-unit components

1 intake fan 2 inverter control PCB 3 ADF door-open sensor

(PS10)

4 optical-unit drive-belt 5 optical-unit motor (under the

shield)

6 power supply (under the

shield)

7 control-panel connector 8 scanner controller board

(under the shield)

91011

9 optical-unit assembly

(includes the CCD driver PCB)

10 scanner lamp 11 optical-unit lock

7 6

C9148-90909 5 Theory of operation 55

ADF components

Figure 20. ADF - u nit components

1 ADF separation roller 2 ADF pickup roller 3 ADF pickup solenoid (SL1) 4 ADF drive motor 5 ADF-to-scanner controller

connector

6 document-detect sensor

flag(PS2)

7 leading-edge sensor (inside

the ADF; PS1)

8 ADF separation pad 9 ADF sliding media guides

56 Theory of operation C9148-90909

Copy processor board

This section describes the operation of the copy processor board (CPB) during normal operation of the MFP. This description is more detailed than the CPB troubleshooting chapter in this manual.

The CPB is the link between the formatter in the print unit and the scanner controller board in the scan unit. Control signals from the formatter are sent to the CPB. The CPB then sends these control signals to the scanner controller board. After the scanner controller board completes the scanning process, the scanned data is sent to the copy processor board. The copy processor board processes the image and sends the image data to the formatter.

CPB terminology

● ASIC (application specific integrated circuit): is the system controller that provides the

peripheral component interconnect (PCI), DIMM, and processor interface. The ASIC performs monochrome data compression.

● Firmware code DIMM (dual inline memory module): contains the firmware that controls the

system.

● Digital signal processor (DSP): runs the image processing algorithms.

● FPGA (field programmable gate array): provides an interface to the scanner, SRAM, DSP,

and PCI bridge and provides front-end image processing.

● IEEE 1394 phy. (physical layer): provides an interface from the CPB to the formatter (high-

speed copy connect cable)

● IEEE 1394 protocol chip: connects the PCI bus to the IEEE 1394 phy.

● MIPS (millions of instructions per second) processor: is the system processor that runs the

firmware.

● PCI (peripheral component interconnect) bridge: connects the PCI bus to the FPGA.

● RAM (random access memory) DIMM: provides main system memory and temporary

storage for image data and firmware variables.

● RAM for DSP: provides temporary storage for image processing in the DSP.

● SRAM (static RAM): is the memory used for aligning the image data from the scanner.

MIPS processor

ASIC

16-MB DIMM

Firmware code DIMM

IEEE 1394 phy.

SRAM FPGA DSP RAM

Figure 21. Copy processor board components

IEEE 1394 protocol chip

PCI bridge

DSP

Hard code for FPGA

C9148-90909 5 Theory of operation 57

The CPB controls the following scanning-process control signals:

● ADF unit and scan unit operation

• directs the scanner controller board about when to scan

• directs the scanner controller board about how to scan

• directs the scanner controller board about when to activate motors

• directs the scanner about when to turn the scanning lamp on and off

● Image processing

• color alignment

• resolution conversion

• image sharpening

• moire removal

• image scaling

• shifting of data strips (reconstructing separately processed image data before CPB

communication to the formatter)

• RGB conversion for CPB communication

• CPB communication over the high-speed copy connect cable to the formatter in one of the

following formats:

• Hardware Ready Bits (HRB) (fastpath) communication with the hard disk on the formatter

• PCL-XL (N-up, rotation, book mode) communication with the hard disk on the formatter

• JPEG compression (when sending data digitally) communication with the hard disk on the formatter

• data compression before sending to the formatter over the high-speed copy connect cable

Typical scanning-process flow

1 The original document is placed on the glass or in the ADF. 2 The user selects job preferences by using the control-panel buttons and keys. The user

presses the

3 Some job preferences are held and then processed later (for example, N-up) by the

formatter. Others are sent to the CPB.

4 The CPB sends control signals to the scanner controller board. The document is scanned. 5 The scanner controller board sends scanned-image data back to the CPB. 6 The CPB processes the image. 7 The CPB sends the image data to the formatter. 8 The formatter further processes the image data (if required). 9 The image data is then either printed or sent digitally, depending on what the user specified

at the beginning of the process.

START button. Job preferences are sent to the formatter.

58 Theory of operation C9148-90909

Copy processor board LEDs

The CPB has four light-emitting diodes (LEDs) that can be viewed when you face the back of the MFP (callout 1). These LEDs illuminate in specific patterns depending on the CPB status during initialization (initialization occurs when power to the MFP is turned on). After initialization, the LEDs can be used to troubleshoot the CPB (see “T r oubleshooting with the copy processor board”

on page 124).The table in this section describes the LED pattern sequences during the first and

second stage of CPB initialization.

Hint The LEDs can be difficult to see through the holes provided in the CPB faceplate (callout 1) in a

high-light environment. It might be necessary to turn off some lights or remove the faceplate to see the LEDs.

The LED patterns an HP LaserJet 4100/4101mfp displays are the opposite of those on the HP LaserJet 9000mfp because of how the CPBs are mounted. The CPB is mounted upside down in the HP LaserJet 9000mfp.

Figure 22. Copy processor board LEDs

Table 9. Copy processor board LEDs (initialization sequence)

LED pattern CPB status

First stage of CPB initialization

ON* ON* ON ON *LEDs might flash

before coming to a solid illuminated state

● CPB flash DIMM detected

● CPB RAM DIMM detected

● CPB processor is working

● CPB has commun ic ation wi th the ASIC

Note If CPB initialization stops and the LEDs stay in the continuously illuminated

state, a CPB failure has occurred (for example, a memory DIMM is not present or fully seated). T o troubleshoot a CPB failure, see “Troubleshooting

with the copy processor board” on page 124.

C9148-90909 5 Theory of operation 59

Table 9. Copy processor board LEDs (initialization sequence)

LED pattern CPB status

ON ON OFF ON ● Communication is established between the MIPS processor and the PCI

bridge. OFF ON OFF ON OFF OFF OFF ON OFF OFF OFF OFF

● Communication is established between the MIPS processor and the FPGA.

● The FPGA SRAM is checked.

● Communication is established between the MIPS processor, the DSP, and

the DSP RAM.

Second stage of CPB initialization

LED pattern CPB status

OFF OFF OFF ON ● The rightmost LED illuminates and stays on when the conne ction to the SSA

(the portion of the firmware tat runs in the print engines RAM) is established. OFF OFF ON ON

● The LED second from the right illuminates when communication occurs

between the CPB and the scan engine. ON* OFF ON ON

*Flashing after a one to two second solid

● The leftmost LED illuminates to indica te the C PB has boot ed prope rly. When

this LED begins to flash (referred to as the CPB heartbeat), the CPB is

functioning normally and the MFP is ready to process jobs. illumination state

Hint The CPB remains in this state even when the MFP is in PowerSave mode.

60 Theory of operation C9148-90909

Scanner co n t roller bo a rd

The scanner controller board controls the operation of flatbed and ADF components used in the following scanning processes: document transportation, document exposure, and imaging. When the copy processor board sends the scan commands to the scanner controller board, the scanner controller board sends signals to the motors, solenoids, scanning lamp, and CCD driver PCB.

The scanner controller board controls the operation of the following components:

● ADF document transportation

• ADF sensors (door-open, document-detect, and leading-edge sensors)

• ADF solenoid

• ADF drive motor

● document exposure

• optical-unit home-position sensor

• scanning lamp

• scanning motor

● imaging process

• CCD driver PCB (converts reflected light to a digital RGB signal)

• copy processor com munic atio n

● flatbed intake fan (off in PowerSave mode, half-speed when idle; full-speed when scanning)

ADF motor circuit

The ADF motor circuit controls the operation of the ADF motor. The ADF motor is a +24 vdc stepping motor. It rotates in a counterclockwise direction. The ADF motor is not fault-protected.

Note When a fault-protected motor circuit fails, an error message appears on the control panel. The

ADF motor circuit is not fault protected. No error message appears on the control-panel display if this circuit fails.

Optical-unit motor circuit

The optical unit motor circuit controls the optical unit motor and the movement of the unit. The optical unit motor is a +24 vdc stepping motor. It rotates in both a clockwise and counterclockwise direction. If the optical unit motor fails, the message 30.1.17 SCAN FAILURE appears on the control-panel display.

Scan-unit intake-fan motor circuit

The fan motor circuit controls the fan speed. The fan is off in PowerSave mode, it rotates at halfspeed when the product is idle, and at full-speed during the scanning process, when a document is detected in the ADF, or when a control-panel button or key is pushed. If the fan motor fails, the message 30.01.06 Scan Failure appears on the control panel-display.

C9148-90909 5 Theory of operation 61

Scanner controller board connectors

J 1209

J1208

J1207

J1206

J1205

Figure 23. Scanner controller board connectors (shield off)

J1210

PI1201

Scanner controller

with the shield on

J1201

J1202

J1203

Table 10. Scanner controller board connectors

Connector Description Remarks

J1201 Power-supply connector 10-pin connector. To gain access to this connector,

J1202 Inverter PCB connector 5-pin connector. To gain access to this connector,

J1203 Flatbed intake fan 3-pin connector. To gain access to this connector,

J1205 ADF connector 15-pin connector. Verify that the connector’s locking

J1206 ADF door-open sensor (PS10) 3-pin connector. To gain access to this connector,

J1207 Optical-unit drive motor 4-pin connector. To gain access to this connector,

J1208 CCD connector Flat ribbon cable. To gain access to this cable, remove

J1209 Intermediate PCB This connector connects the copy processor board to the

J1210 Control panel 5-pin connector. To gain access to this connector,

PI1201 Optical-unit home-position sensor (PI1201) This sensor is soldered to the scanner controller board.

remove the glass. See “Glass” on page 92.

thumb screws are tight. This connector can be removed accessed without removing any other MFP components.

remove the glass. See “Glass” on page 92.

the glass. See “Glass” on page 92.

scanner controller board. It cannot be disconnected independently of removing the scanner controller board.

remove the glass. See “Glass” on page 92.

To gain access to this sensor, remove the glass. See

“Glass” on page 92.

62 Theory of operation C9148-90909

Intermediate PCB

The intermediate PCB connects the copy processor board and the ADF to the scanner controller board.

Po wer supply

The power supply converts ac power from the source inlet (power cord) to low-voltage dc power. Low-voltage power is supplied to various flatbed and ADF components. Low-voltage power from the power supply consists of +3.3 vdc, +5 vdc, +12 vdc, and +24 vdc voltages.

Table 11. Low-voltage components

Voltage Components

+3.3 vdc ● scanner controller board

● scanner controller-to-engine co ntrol le r conne ct or

● scanner controller-to-copy processor board intermediate PCB

● CCD drive circuit

● document-detect sensor

● leading-edge sensor

● optical unit home-position sensor

+5 vdc

+12 vdc

+24 vdc

● scanner controller board

● scanner controller-to-video control ler connector

● CCD drive circuit

● scanner controller board

● CCD drive circuit

● scanner controller board

● document-pickup solenoid

● ADF motor

● optical-unit motor

● flatbed intake fan

● inverter circuit

Overcurrent and overvoltage protection

The power supply uses overcurrent and overvoltage protection. If a short-circuit on the load side (flatbed and ADF component side) causes an excessive current or voltage draw, the overcurrent or overvoltage protection function interrupts the power-supply output. If this happens, turn the printer off, and then identify and repair the malfunctioning component.

Note The power supply must remain off for at least two minutes for the overcurrent and overvoltage

functions to reset.

A fuse (power supply PCB F101) protects against overcurrent coming from the ac source inlet (power cord).

C9148-90909 5 Theory of operation 63

Power-supply block diagram

Figure 24. Power-supply block diagram

64 Theory of operation C9148-90909

Optical unit

The optical unit consists of the optical unit chassis, the scanning lamp, the CCD driver PCB, and the optical-unit motor. When the power is turned on, the scanner controller board activates the optical-unit motor, and the unit begins to move along the rails. When the optical-unit home sensor flag (located on the bottom of the unit) aligns with the home-position sensor (located on the scanner controller board; PI1201), the unit stops in the home position.

Figure 25. Optical unit block diagram

The scanner controller board illuminates the flatbed lamp after receiving the scan command from the copy processor board. As the document is exposed to the illumination of the scanning lamp, the reflected light from the glass is sent by way of three scanning mirrors and a lens to the CCD driver PCB for image processing. When the scanning process is complete, the optical unit returns to the home position.

Figure 26. Scanning process

C9148-90909 5 Theory of operation 65

Inverter PCB

The inverter PCB provides the current and voltage phase the scanning lamp requires.

Scanning lamp

The scanning lamp illuminates the source document, which causes reflected light from the glass to be directed to the CCD driver PCB for document imaging.

CCD driver PCB

When the CCD driver receives the reflected light from the exposure process, it photo-electrically converts the light into three analog signals (RGB). These three signals pass through an analogto-digital converter, and the resulting digital signals are sent to the scanner controller PCB. The scanner controller sends the digital signals to the copy processor board for output by the base printer, which initiates output through the base printer.

Figure 27. Signal conversion

66 Theory of operation C9148-90909

ADF document-feed system

Overview

The ADF document-feed system detects the presence of a source document in the document tray, picks up the document and transports it through the ADF paper path, and then delivers the source document to the ADF output.

● The ADF motor rotates counterclockwise, which rotates the feed and delivery rollers. The

document pickup solenoid is activated, causing the pickup and separation rollers to rotate. If more than one source document is in the ADF input tray, the separation roller and separation pad clear the multiple-sheet feed, and then the first document is sent into the flatbed scanning path.

● The leading-edge sensor detects the source document in the paper path and then the

scanning lamp illuminates.

● The source document is passed through the flatbed scanning path and the image

processing operation (controlled by the CCD driver) begins.

● The delivery roller transfers the source document to the ADF output. If more source

documents are in the input tray, the process repeats.

Figure 28. Document transport path

Hint To locate these components on the ADF, see “ADF components” on page 56.

C9148-90909 5 Theory of operation 67

ADF cover sensor (PS10)

The ADF door-open sensor (PS10) detects ADF door status (open or closed). If the ADF door is opened, a FLATBED COVER OPEN message appears on the control-panel display. If the ADF door is opened during the document transport process, the ADF drive-motor stops and a door-open message appears on the control panel.

Document-detect sensor (PS2)

The document-detect sensor (PS2) detects the presence of documents when they are placed into the ADF document input tray.

Leading-edge sensor (PS1)

When a document enters the document transport path, it must pass the leading-edge sensor (PS1) within a specified amount of time. If it does not, a paper-jam message appears on the control-panel display.

ADF motor

The ADF motor is controlled by the scanner controller board. When the scanner controller receives the scan command, the ADF motor rotates counterclockwise, which starts rotation of the feed and delivery rollers.

Document pickup process

When the document pickup solenoid is activated, the pickup and separations rollers begin to rotate. If more than one source document is in the pickup tray, the separation roller and separation pad clear the multiple feed, and then the first document is sent toward the flatbed.

Document jams

The scanner controller board detects a jam by verifying that each document passes the leadingedge sensor in a specified amount of time. If a document does not pass by the sensor in time, the scanning operation stops. A document-jam message appears on the control-panel display, and the user must clear the jam. The scanner controller board can detect two types of jams:

● Document-delay jam: If the leading-edge sensor does not detect the leading edge of the

document after the document pickup solenoid is activated, the scanner controller initiates a document-delay jam signal.

● Document-stationary jam: If the leading-edge sensor does not detect the trailing edge of

the document after it detects that the leading edge has passed, the scanner controller board initiates a document-stationary jam signal.

Scan-unit intake fan

The intake fan draws fresh air into the flatbed assembly. It is controlled by the fan-drive circuit, which is located on the scanner controller board. The fan is off in PowerSave mode, it rotates at half-speed when the product is idle, and at full-speed during the scanning process. The intake fan motor is fault-protected. If the fan motor fails, the message 30.01.06 Scan Failure appears on the control-panel display.

CAUTION The fan must be replaced so that it draws air into the flatbed. Failure to correctly position the fan

can result in damage to MFP components. Verify that the airflow arrow (located under the drivebelt tension bracket) embossed on the fan housing points into the flatbed. See, “Correctly orient

the intake fan and bracket” on page 107.

68 Theory of operation C9148-90909

6 Removal and replacement

Removal and replacement strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Required tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Before performing service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

After performing service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Common fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Parts removal order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

User-replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

ADF input tray. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

ADF pickup roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

ADF separation roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

ADF separation pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

ADF unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Assemblies and covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Control-panel door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Scan-unit right-side cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Copy processor board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Scan-unit left-side cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Intake fan filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Formatter cage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Scan unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Printing-unit top cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Glass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Scanning lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Optical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

ADF door open sensor (PS10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Optical-unit drive gear/motor assembly . . . . . . . . . . . . . . . . . . . . . 99

Scan-unit power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Inverter PCB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Scanner controller PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Intake fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

C9148-90909 6 Removal and replacement 69

Removal and replacement strategy

This chapter documents the removal and replacement of field replaceable units (FRUs) only. Reinstallation is generally the reverse of removal. Occasionally, notes are included to provide directions for difficult or critical replacement procedures.

WARNING! Unplug the power cord from the power outlet (at the wall receptacle) before attempting to service

the product. If this warning is not followed, severe injury can result. Certain functional checks during troubleshooting must be performed with power supplied to the product. However , the power supply should be disconnected during removal.

The power cord must be unplugged from the wall receptacle. Unplugging the cord from the back of the print unit does not prevent AC power from going to the scan unit. See “Back view” on

page 21.

CAUTION The product contains components that are sensitive to electrostatic discharge (ESD). Always

perform service work at an ESD-protected workstation. If an ESD-protected workstation is not available, discharge body static by grasping the print engine chassis before touching an ESD sensitive component. Ground the print engine chassis before servicing the product.

Required tools

● #2 Phillips screwdriver with magnetic tip

● small flatblade screwdriver

● needle-nose pliers

● ESD mat (if available)

● penlight (optional)

CAUTION A PoziDriv screwdriver will damage screw heads on the product. Use a #2 Phillips screwdriver.

Hint To install a self-tapping screw, first turn it counterclockwise to align it with the existing thread

pattern, then carefully turn it clockwise to tighten. Do not overtighten.

Before performing service

● If possible, print a configuration page. See “Configuration page” on page 130.

● Remove all media from the product.

● Unplug the power cord from the wall receptacle. Unplugging the cord from the back of the

print unit does not prevent AC power from going to the scan unit.

● Place the product on an ESD mat, if available. If an ESD-protected workstation is not

available, discharge body static and ground the print engine chassis before servicing the product.

● Remove the print cartridge. See “Checking the print cartridge” on page 137.

After performing service

● Replace the print cartridge.

● Reconnect all cables to the product.

● Replace all accessories and reload the media.

● Verify that the latest firmware is installed on the product. See “Configuration page” on

page 130.

● Restore customer configuration settings.

70 Removal and replacement C9148-90909

Common fasteners

Table 12. Common fasteners found in the MFP

Illustration and description

Black self-tapping Phillips-head screw

Silver self-tapping Phillips-head screw

Machine screw with serrated washer

Short Phillips-head screw with small shoulder

Long Phillips-head screw with large shoulder

Phillips-head machine screw with loose washer

Hint To order replacement screws,

see table 27 on page 146.

C9148-90909 6 Removal and replacement 71

Parts removal order

Use the following diagram to determine the order in which parts must be removed (scan unit and ADF units only).

Table 13. Parts-removal tree

ADF input tray ADF pickup roller ADF separation roller ADF separation pad Control panel door ADF unit

Glass

Door interlock (PS10) Inverter PCB Scanning lamp

scan-unit right-side cover Optical unit

Copy processor board Optical-unit drive gear/motor

scan-unit left-side cover Intake fan scan-unit power

supply

Intake fan filter Copy processor board

Formatter cage Scanner controller

scan unit

Printing-unit top cover

Note The copy processor board is intentionally listed twice.

72 Removal and replacement C9148-90909

User-replaceable parts

ADF input tray

1 Open the ADF cover. Gently pry the input-tray hinge pin (located towards the front of the

MFP; callout 1) out of its pivot hole.

CAUTION The hinge pin can easily be snapped off of the input tray if too much pressure is applied.

Figure 29. Release the ADF input-tray hinge

2 When the hinge pin clears the pivot hole, rotate the input tray away from the MFP (as

indicated by the arrow) and slide the other hinge pin out of its pivot hole. Remove the tray.

Figure 30. Remove the ADF input tray

C9148-90909 6 Removal and replacement 73

ADF pickup roller

1 Open the ADF cover (callout 1). 2 Pull the plastic tab (callout 2) to release the lower edge of the roller shield.

1221

Figure 31. Release the roller shield

3 Release the roller shield from the two small pins (callout 3), and remove it from the product.

Figure 32. Remove the roller shield

74 Removal and replacement C9148-90909

4 Slide the roller toward the gear end. Gently pry the roller-shaft locking tab (callout 4) away

from the roller. Remove the ADF pickup roller.

Figure 33. Remove the ADF pickup roller

Hint When replacing the roller, verify that the roller gear and drive gear are properly meshed.

C9148-90909 6 Removal and replacement 75

ADF separation roller

1 Open the ADF cover, and remove the roller shield. See “ADF pickup roller” on page 74. 2 Slide the roller toward the gear end. Gently pry the roller-shaft locking tab (callout 1) away

from the roller. Remove the ADF separation roller.

Figure 34. Remove the ADF separation roller

Hint When replacing the roller, verify that the roller gear and drive gear are properly meshed.

76 Removal and replacement C9148-90909

ADF separation pad

1 Open the ADF cover. 2 Press and release two separation locking tabs (callout 1; shown already released). 3 Rotate the separation pad until it is perpendicular to the product. 4 Release the separation-pad arms (callout 2) by gently pressing them toward the ADF cover.

212

Figure 35. Remove the ADF separation pad

Note When replacing the separation pad, verify that the spring is firmly seated on its pedestal (callout 3).

Figure 36. Replace the ADF separation pad spring

C9148-90909 6 Removal and replacement 77

ADF unit

1 Disconnect the ADF cable (callout 1).

Figure 37. Disconnect the cable

2 Open the ADF unit, and lift it straight up and off of the scan unit.

Figure 38. Remove the ADF unit

78 Removal and replacement C9148-90909

Assemblies and covers

Control-panel door

1 Open the control-panel door, and remove the print cartridge. Cover the print cartridge to

keep it out of direct light; see the HP LaserJet 4100 series printer service manual for printcartridge information.

Figure 39. Remove the print cartridge

2 Press the two tabs (callout 1) on the inside of the print-cartridge lever to release it. 3 Remove one screw (callout 2). 4 Remove the wire-harness plastic cover (callout 3).

Figure 40. Remove the control-panel wire-harness cover

C9148-90909 6 Removal and replacement 79

5 Remove one screw (callout 4), and disconnect the top edge of the grounding strip.

Figure 41. Disconnect the control-panel grounding strip

6 Disconnect the control-panel-cable connector (callout 5). 7 Separate the door-support pins (callout 6) to release them.

565

Figure 42. Release the control-panel door-support pins

80 Removal and replacement C9148-90909

8 Flex the left arm (callout 7) to the right (inward), and move the control-panel door toward the

right side of the product until the arm releases. Slide the control-panel door toward the left, and remove it from the product.

Figure 43. Remove the control-panel door

Note Step 9 is essential. The MFP must retain the original serial- and model-number label panel.

WARNING! The control panel in figure 44 is shown installed in the open position so that the label panel screws

can be easily seen. Remove the control panel and lay it on a flat surface before removing the label panel to keep from dropping the mounting screws into the print unit.

9 Remove seven screws (callout 8), and remove the panel. Reinstall the label panel on the

replacement control-panel door.

Figure 44. Remove the product serial- and model-number panel

C9148-90909 6 Removal and replacement 81

Scan-unit right-side cover

Note If a duplex accessory is installed, remove it to access the right-side cover mounting screw.

1 Remove one screw (callout 1) from the plastic tab on the scan-unit right-side cover.

Figure 45. Remove the right-side cover screw

2 Grasp the plastic tab and pull the cover downward and away from the right side of the

product. Lift the cover up to release it, and then remove it from the product.

Figure 46. Remove the scan-unity right-side cover

82 Removal and replacement C9148-90909

Copy processor board

1 Remove the scan-unit right-side cover. See “Scan-unit right-side cover” on page 82. 2 Unplug the ADF connector cable (callout 1) and remove two screws (callout 2).

121

Figure 47. Disconnect the ADF cables

CAUTION Sliding the CPB out without unplugging the high-speed copy connect cable (callout 3) will damage

the cable connector.

3 Slide the copy processor board (CPB) out of the product approximately 2.5 mm (1 inch), and

disconnect the high-speed copy connect cable (callout 3).

Figure 48. Disconnect the high-speed copy connect cable

4 Remove the CPB from the product.

C9148-90909 6 Removal and replacement 83

Scan-unit left-side cover

Note If a duplex accessory is installed, remove it to access the right-side cover mounting screw.

1 Remove one screw (callout 1) from the scan-unit left-side cover.

Figure 49. Remove the left-side screw

2 Gently pry the rounded top edge of the cover (callout 2) with a flatblade screwdriver until you

can grasp it.

Figure 50. Gently pry the top edge of the left-side cover

84 Removal and replacement C9148-90909

3 Pull the cover downward and away from the left side of the product. Lift the cover up to

release it, and then remove it from the product.

Figure 51. Remove the scan-unit left-side cover

C9148-90909 6 Removal and replacement 85

Intake fan filter

1 Remove the scan-unit left-side cover. See “Scan-unit left-side cover” on page 84. 2 Remove the intake filter (callout 1).

Figure 52. Remove the intake filter.

86 Removal and replacement C9148-90909

Formatter cage

1 Grasp the back edge (callout 1) of the formatter-cage cover. 2 Pull the cover toward the back of the product, and remove it.

Figure 53. Remove the formatter-cage cover

3 Remove two screws (callout 2). 4 Slide the formatter cage toward the back of the product approximately 2.5 mm (1 inch), and

locate the formatter end of the high-speed copy connect cable connector (callout 3).

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Figure 54. Slide the formatter cage toward the back of the product

C9148-90909 6 Removal and replacement 87

5 Twist the formatter away from the right side of the product, and unplug the high-speed copy

connect cable (callout 4).

6 Remove the formatter cage.

Figure 55. Disconnect the formatter high-speed copy connect cable

Note When replacing the formatter cage, align the back of the formatter cage with two large guide pins

and then slide it forward

88 Removal and replacement C9148-90909

Scan unit

1 Remove the following covers and assemblies:

• ADF unit. See “ADF unit” on page 78.

• scan-unit right-side and left-side covers. See “Scan-unit right-side cover” on page 82

through “Scan-unit left-side cover” on page 84.

• formatter cage. See “Formatter cage” on page 87.

2 Secure the optical unit by sliding the lock to the closed position.

Figure 56. Secure the optical unit

3 Remove two screws from the CPB and slide the CPB out of the product approximately

2.5 mm (1 inch). It is not necessary to remove the CPB from the scan unit.

4 Disconnect the CPB cable (callout 1).

Figure 57. Disconnect the CPB cable

C9148-90909 6 Removal and replacement 89

5 Disconnect the scan unit cable (callout 2) under the glass.

Figure 58. Disconnect the scan unit cable

6 Face the front of the product, and remove two screws (callout 3). 7 Slide the scan unit toward the back of the product, and remove it.

Figure 59. Remove the scan unit

90 Removal and replacement C9148-90909

Printing-unit top cover

1 Remove the scan unit. See “Scan unit” on page 89. 2 Open the rear output door. 3 Remove two screws (callout 1) from the back of the product.

Figure 60. Remove the top-cover rear-mounting screws

4 Face the front of the product, and open the control-panel door. 5 Remove four screws (callout 2). 6 Lift the top cover off of the product.

Figure 61. Remove the printing-unit top cover

C9148-90909 6 Removal and replacement 91

Glass

Note It is not necessary to remove the scan unit from the print unit (as shown) to remove the glass.

1 Remove the ADF assembly. See “ADF unit” on page 78. 2 Remove three s crews (callout 1).

Figure 62. Remove the glass mounting screws

CAUTION Use caution, the thin plastic tab holders (callout 2) can bend or break. Avoid touching the glass.

Fingerprints and skin oils can cause poor print quality.

3 Move the glass toward the front of the product until the three plastic tabs (callout 2) release.

Lift the glass straight up, and remove it from the product.

4 After replacing the glass, calibrate the ADF/scan unit. See “Performing automatic

Calibration” on page 47.

Figure 63. Remove the glass

92 Removal and replacement C9148-90909

Scanning lamp

1 Remove the glass. See “Glass” on page 92.

CAUTION Do not touch the lamp, because skin oils can create hot spots. Do not touch the mirror, because

fingerprints will affect print quality.

2 Note the cable routing pattern, and examine the pink cable where it rests over the cable

guide. Verify that the cable has a small black mark (callout 1). If not, make the mark yourself.

Note When replacing the scanning lamp, transfer the black mark onto the replacement bulb cable.

Position the cable with this mark centered in the cable guide (callout 1). This ensures that the cable has sufficient length to allow the optical unit to move to its home position. Lay the cable flat in the cable trough. Verify that it is not twisted.

3 Disconnect the lamp connector (callout 2).

Note A torroid may be installed on the scanning lamp cable. If a torroid is installed, remove its single

mounting screw before going on to the next step.

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Figure 64. Note the cable routing pattern

C9148-90909 6 Removal and replacement 93

4 Remove the cable from the cable guides and trough (callout 4). 5 Hold the black end (callout 5), and slide the lamp toward the back of the product (in the

direction of the arrow).

545

Figure 65. Remove the scanning lamp

CAUTION When installing the scanning lamp, the wire harness must be properly routed under the harness

clips and flat through the harness trough to avoid interference with the optical unit as it moves in the scan unit.

Figure 66. Scanning-lamp wire harness routing

Reinstall Note Anytime the glass is removed and replaced, calibrate the ADF/scan unit. See “Calibration” on

page 47.

94 Removal and replacement C9148-90909

Optical unit

1 Remove the following assemblies:

• glass. See “Glass” on page 92

• scanning lamp. See “Scanning lamp” on page 93.

CAUTION Do not touch the mirror, because fingerprints will affect print quality.

CAUTION It is important to note the routing and placement of the optical-unit ribbon cable before removing

it. Incorrect routing or placement when the cable is re-installed might cause damage to the cable or the optical unit. See figure 72 on page 97.

2 Open the cable clip (callout 1) and disconnect the scanner-carriage ribbon cable from the

scanner controller PCB.

Figure 67. Release the optical unit ribbon cable

Hint Unsnap the clip arm from its hinge end (see figure 68) and remove it to prevent losing the clip

arm during servicing. T ake note of how the clip is hinged and how it is fastened before removing it.

Hinge end Clip end

Figure 68. Optical-unit ribbon-cable clip

C9148-90909 6 Removal and replacement 95

3 Center the optical unit in the scan unit to allow access to the optical-unit drive-belt tension

bracket (callout 2).

4 Loosen, but do not remove, the tension-spring bracket screw (callout 3) and swivel the

bracket to release the tension on the drive-belt (callout 4). Slip both ends of the drive-belt off the drive and tension gears.

Figure 69. Release the tension-spring bracket

5 Lift the round rail up to remove it from two holders (callout 5), and remove the optical unit

from the scan unit.

Figure 70. Remove the optical unit

96 Removal and replacement C9148-90909

Reinstall Note Anytime the glass is removed and replaced, calibr ate the ADF/scan u nit. See “Calibration” on

page 47.

Reinstall Note With the optical unit installed, place the optical-unit drive-belt onto the drive and tension gears.

Verify that the drive-belt teeth face inward and are engaged with the gear teeth. Position the bracket with the locator pins in the provided holes on the bracket, and tighten the

screw until it holds the bracket in place but still allows the bracket to move. Verify that the bracket is correctly positioned on the locator pins, and fully tighten the screw.

Figure 71. Optical-unit drive-belt tension bracket

Figure 72. Optical-unit ribbon cable

CAUTION The optic al-unit rib bon cable must be looped behind the optical head and secured with the ribbon-

cable clip. Failure to correctly route or secure the ribbon cable might result in damage to the cable or the optical unit.

C9148-90909 6 Removal and replacement 97

ADF door open sensor (PS10)

1 Remove the glass. See “Glass” on page 92. 2 Unplug one connector (callout 1). 3 Remove one screw (callout 2). 4 Lift the ADF door sensor up, and remove it from the product.

121

Figure 73. Remove the ADF door open sensor

Reinstall Note When replacing the glass, verify that the sensor switch pin freely moves in the hole through the

glass mounting frame. Anytime the glass is removed and replaced, calibrate the ADF/scan unit. See “Calibration” on

page 47.

98 Removal and replacement C9148-90909

HP LaserJet 4100mfp Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Quick reference service PIN code: 04410002

Table of contents

List of figures

List of tables

1 Product Information

Introduction

Product configurations

Product features

Product speed and throughput

Image quality

Paper handling

Copying capability

Expandable design

Product specifications

Media specifications

Special considerations for ADF documents

Supported media for the glass

Model and serial numbers

Product overview

Front view

Back view

2 Service approach

Service approach

Major assemblies

Contact HP

World Wide Web

HP support assistant CD-ROM

HP authorized resellers and support

HP service agreements

3 Operation

Using the ADF unit

General guidelines for using the ADF unit

Using the glass

General guidelines for using the glass

Using the control panel

Layout and operation

Navigation

Walk-up copy display

Status bar

Menus

Configure device, diagnostic, and service menus

Menu map

4 Maintenance

Cleaning the product

General guidelines

Running the cleaning page

Cleaning the ADF delivery guide (clear mylar strip)

User-replaceable parts

Updating product firmware

Downloading a remote firmware update

Installing the update

RFU installation messages

Using HP Web JetAdmin (single update)

Using HP Web JetAdmin (multiple or unattended update)

Windows parallel connection (local printer)

Windows parallel connection (network printer)

Troubleshooting RFU installation

RFU installation error messages

Performing hard-drive disk initialization

Cold Reset

NVRAM initialization

Calibration

Performing automatic Calibration

Performing manual calibration

Lead adjustment for the ADF

Center adjustment for the ADF

Leading-edge adjustment for the glass

Side-edge adjustment for the glass

5 Theory of operation

Introduction

Overview

Document transportation process

Document exposure system

Light-conversion process

General descriptions

Scan-unit components