HP m14, m17, m28, m31 Repair Manual

HP LaserJet Pro M14-M17 and LaserJet Pro
MFP M28-M31

Repair Manual

Copyright and License

© Copyright 2018 HP Development Company,
L.P.

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

The information contained herein is subject to
change without notice.

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

Edition 1, 04/2018

Conventions used in this guide

TIP: Helpful hints or shortcuts.

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

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

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

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

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

damage to the printer.

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iv Conventions used in this guide ENWW

For additional service and support information

HP service personnel, go to one of the following Web-based Interactive Search Engines (WISE) sites:

AMS

● https://support.hp.com/wise/home/ams-en

● https://support.hp.com/wise/home/ams-es

●

https://support.hp.com/wise/home/ams-pt

APJ

● https://support.hp.com/wise/home/apj-en

● https://support.hp.com/wise/home/apj-ja

● https://support.hp.com/wise/home/apj-ko

● https://support.hp.com/wise/home/apj-zh-Hans

● https://support.hp.com/wise/home/apj-zh-Hant

EMEA

● https://support.hp.com/wise/home/emea-en

Channel partners, go to HP Channel Services Network (CSN) at www.hp.com/partners/csn .

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

● Install and congure

● Printer specications

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

● Solutions for printer issues and emerging issues

● Remove and replace part instructions and videos

● Service advisories

● Warranty and regulatory information

Channel partners, access training materials in the HP University and Partner Learning Center at

https://content.ext.hp.com/sites/LMS/HPU.page.

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

ENWW v

vi For additional service and support information ENWW

Table of contents

1 Removal and replacement ...................................................................................................................................................................... 1

For additional service and support ........................................................................................................................................ 2

Removal and replacement strategy ...................................................................................................................................... 3

Introduction .......................................................................................................................................................... 3

Considerations during removal and replacement .......................................................................................... 3

Electrostatic discharge ........................................................................................................................................ 4

Required tools ...................................................................................................................................................... 5

Fasteners used in this printer ............................................................................................................................ 5

Service approach ...................................................................................................................................................................... 6

Before performing service .................................................................................................................................. 6

Accessing the secondary service menu ........................................................................................................... 6

After performing service ..................................................................................................................................... 7

Post-service tests ................................................................................................................................................ 7

Order parts by authorized service providers ....................................................................................................................... 8

Ordering ................................................................................................................................................................. 8

Orderable parts .................................................................................................................................................... 8

Whole unit replacement (WUR) ......................................................................................................................... 8

Supplies and accessories ................................................................................................................................. 10

Related documentation and software ........................................................................................................... 10

Removal and replacement procedures .............................................................................................................................. 11

Customer self-repair (CSR) components ....................................................................................................... 11

Field Replaceable Units (FRUs) / Bench Repair Units (BRUs) ...................................................................... 20

2 Parts and diagrams .............................................................................................................................................................................. 329

For additional service and support ................................................................................................................................... 330

Assembly locations .............................................................................................................................................................. 331

External panels, doors, and covers .............................................................................................................. 331

Main assemblies .............................................................................................................................................. 332

Main parts ......................................................................................................................................................... 332

PCA .................................................................................................................................................................... 333

Order parts, accessories, and supplies ............................................................................................................................ 334

Ordering ............................................................................................................................................................ 334

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Orderable parts ............................................................................................................................................... 334

Supplies ............................................................................................................................................................ 334

Customer self-repair parts ............................................................................................................................ 334

Related documentation and software ......................................................................................................... 335

How to use the parts lists and diagrams ......................................................................................................................... 336

Covers .................................................................................................................................................................................... 338

Covers (M14-M17) .......................................................................................................................................... 338

Covers (MFP M28-M31) .................................................................................................................................. 340

Internal components ........................................................................................................................................................... 342

Internal components (1 of 2) ........................................................................................................................ 342

Internal components (2 of 2) ........................................................................................................................ 344

Alphabetical parts list ......................................................................................................................................................... 346

Numerical parts list ............................................................................................................................................................. 349

Index ........................................................................................................................................................................................................... 353

viii ENWW

List of tables

Table 2-1 External panels, doors, and covers (M14-M17) ............................................................................................................. 331

Table 2-2 External panels, doors, and covers (MFP M28-M31) .................................................................................................... 331

Table 2-3 Main assemblies .................................................................................................................................................................. 332

Table 2-4 Main parts ............................................................................................................................................................................ 332

Table 2-5 PCA ........................................................................................................................................................................................ 333

Table 2-6 Supplies ................................................................................................................................................................................ 334

Table 2-7 Covers (M14-M17) .............................................................................................................................................................. 339

Table 2-8 Covers (MFP M28-M31) ..................................................................................................................................................... 341

Table 2-9 Internal components (1 of 2)1 .......................................................................................................................................... 343

Table 2-10 Internal components (2 of 2) .......................................................................................................................................... 345

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x ENWW

List of gures

Figure 1-1 Screwdrivers ........................................................................................................................................................................... 5

Figure 1-2 Remove Tray 1 ..................................................................................................................................................................... 23

Figure 1-3 Remove two screw .............................................................................................................................................................. 26

Figure 1-4 Special disassembly instructions ...................................................................................................................................... 27

Figure 1-5 Remove the link arm ........................................................................................................................................................... 28

Figure 1-6 Remove the link arm ........................................................................................................................................................... 28

Figure 1-7 Remove the link arm ........................................................................................................................................................... 29

Figure 1-8 Remove the cartridge door ................................................................................................................................................ 29

Figure 1-9 Install the link arms on the replacement door ............................................................................................................... 30

Figure 1-10 Install the link arms on the replacement door ............................................................................................................. 30

Figure 1-11 Remove the document lid (M28-M31) .......................................................................................................................... 33

Figure 1-12 Remove two screw ........................................................................................................................................................... 36

Figure 1-13 Special disassembly instructions .................................................................................................................................... 37

Figure 1-14 Remove the link arm ........................................................................................................................................................ 38

Figure 1-15 Remove the link arm ........................................................................................................................................................ 38

Figure 1-16 Remove the link arm ........................................................................................................................................................ 39

Figure 1-17 Remove the cartridge door ............................................................................................................................................. 39

Figure 1-18 Install the link arms on the replacement door ............................................................................................................. 40

Figure 1-19 Install the link arms on the replacement door ............................................................................................................. 40

Figure 1-20 Remove the formatter cover (M14-M17) ...................................................................................................................... 41

Figure 1-21 Remove the formatter cover (MFP M28-M31) ............................................................................................................. 44

Figure 1-22 Remove the formatter cover (MFP M28-M31) ............................................................................................................. 47

Figure 1-23 Disconnect two FFCs ......................................................................................................................................................... 47

Figure 1-24 Special disassembly instructions .................................................................................................................................... 48

Figure 1-25 Remove the link arm ........................................................................................................................................................ 49

Figure 1-26 Remove the link arm ........................................................................................................................................................ 49

Figure 1-27 Remove the link arm ........................................................................................................................................................ 50

Figure 1-28 Remove the link arm ........................................................................................................................................................ 50

Figure 1-29 Remove the image scanner ............................................................................................................................................. 51

Figure 1-30 Remove the cartridge door ............................................................................................................................................. 52

Figure 1-31 Remove the formatter cover (MFP M28-M31) ............................................................................................................. 55

Figure 1-32 Disconnect two FFCs ......................................................................................................................................................... 55

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Figure 1-33 Special disassembly instructions .................................................................................................................................... 56

Figure 1-34 Remove the link arm ........................................................................................................................................................ 57

Figure 1-35 Remove the link arm ........................................................................................................................................................ 57

Figure 1-36 Remove the link arm ........................................................................................................................................................ 58

Figure 1-37 Remove the link arm ........................................................................................................................................................ 58

Figure 1-38 Remove the image scanner ............................................................................................................................................. 59

Figure 1-39 Remove the cartridge door ............................................................................................................................................. 59

Figure 1-40 Remove two screw ........................................................................................................................................................... 62

Figure 1-41 Special disassembly instructions .................................................................................................................................... 63

Figure 1-42 Remove the link arm ........................................................................................................................................................ 64

Figure 1-43 Remove the link arm ........................................................................................................................................................ 64

Figure 1-44 Remove the link arm ........................................................................................................................................................ 65

Figure 1-45 Remove the cartridge door ............................................................................................................................................. 65

Figure 1-46 Install the link arms on the replacement door ............................................................................................................. 66

Figure 1-47 Install the link arms on the replacement door ............................................................................................................. 66

Figure 1-48 Remove the formatter cover (M14-M17) ...................................................................................................................... 67

Figure 1-49 Remove the lower plate ................................................................................................................................................... 67

Figure 1-50 Remove the three screws ................................................................................................................................................ 68

Figure 1-51 Remove the lower cover .................................................................................................................................................. 68

Figure 1-52 Fit two ribs on the printer into the grooves (lower cover install) .............................................................................. 69

Figure 1-53 Remove the formatter cover (MFP M28-M31) ............................................................................................................. 72

Figure 1-54 Disconnect two FFCs ......................................................................................................................................................... 72

Figure 1-55 Special disassembly instructions .................................................................................................................................... 73

Figure 1-56 Remove the link arm ........................................................................................................................................................ 74

Figure 1-57 Remove the link arm ........................................................................................................................................................ 74

Figure 1-58 Remove the link arm ........................................................................................................................................................ 75

Figure 1-59 Remove the link arm ........................................................................................................................................................ 75

Figure 1-60 Remove the image scanner ............................................................................................................................................. 76

Figure 1-61 Remove the cartridge door ............................................................................................................................................. 76

Figure 1-62 Remove the top cover ...................................................................................................................................................... 77

Figure 1-63 Install the pad .................................................................................................................................................................... 78

Figure 1-64 Remove the lower plate ................................................................................................................................................... 78

Figure 1-65 Remove three screws ....................................................................................................................................................... 79

Figure 1-66 Remove the lower cover .................................................................................................................................................. 79

Figure 1-67 Remove the formatter cover (MFP M28-M31) ............................................................................................................. 82

Figure 1-68 Disconnect two FFCs ......................................................................................................................................................... 82

Figure 1-69 Special disassembly instructions .................................................................................................................................... 83

Figure 1-70 Remove the link arm ........................................................................................................................................................ 84

Figure 1-71 Remove the link arm ........................................................................................................................................................ 84

Figure 1-72 Remove the link arm ........................................................................................................................................................ 85

Figure 1-73 Remove the link arm ........................................................................................................................................................ 85

xii ENWW

Figure 1-74 Remove the image scanner ............................................................................................................................................. 86

Figure 1-75 Remove the cartridge door ............................................................................................................................................. 86

Figure 1-76 Remove the top cover ...................................................................................................................................................... 87

Figure 1-77 Install the pad .................................................................................................................................................................... 88

Figure 1-78 Remove two screw ........................................................................................................................................................... 91

Figure 1-79 Special disassembly instructions .................................................................................................................................... 92

Figure 1-80 Remove the link arm ........................................................................................................................................................ 93

Figure 1-81 Remove the link arm ........................................................................................................................................................ 93

Figure 1-82 Remove the link arm ........................................................................................................................................................ 94

Figure 1-83 Remove the cartridge door ............................................................................................................................................. 94

Figure 1-84 Install the link arms on the replacement door ............................................................................................................. 95

Figure 1-85 Install the link arms on the replacement door ............................................................................................................. 95

Figure 1-86 Remove the formatter cover (M14-M17) ...................................................................................................................... 96

Figure 1-87 Remove the lower plate ................................................................................................................................................... 96

Figure 1-88 Remove the three screws ................................................................................................................................................ 97

Figure 1-89 Remove the lower cover .................................................................................................................................................. 97

Figure 1-90 Fit two ribs on the printer into the grooves (lower cover install) .............................................................................. 98

Figure 1-91 Remove the control panel ............................................................................................................................................... 98

Figure 1-92 Pickup roller tab .............................................................................................................................................................. 102

Figure 1-93 Remove pickup roller 1 .................................................................................................................................................. 102

Figure 1-94 Remove pickup roller 2 .................................................................................................................................................. 103

Figure 1-95 Install pickup roller 2 ...................................................................................................................................................... 104

Figure 1-96 Install pickup roller 1 ...................................................................................................................................................... 105

Figure 1-97 Remove two screw ......................................................................................................................................................... 107

Figure 1-98 Special disassembly instructions ................................................................................................................................. 108

Figure 1-99 Remove the link arm ...................................................................................................................................................... 109

Figure 1-100 Remove the link arm .................................................................................................................................................... 109

Figure 1-101 Remove the link arm .................................................................................................................................................... 110

Figure 1-102 Remove the cartridge door ......................................................................................................................................... 110

Figure 1-103 Install the link arms on the replacement door ........................................................................................................ 111

Figure 1-104 Install the link arms on the replacement door ........................................................................................................ 111

Figure 1-105 Remove the formatter cover (M14-M17) ................................................................................................................. 112

Figure 1-106 Remove the lower plate .............................................................................................................................................. 112

Figure 1-107 Remove the three screws ........................................................................................................................................... 113

Figure 1-108 Remove the lower cover ............................................................................................................................................. 113

Figure 1-109 Fit two ribs on the printer into the grooves (lower cover install) .......................................................................... 114

Figure 1-110 Remove the formatter ................................................................................................................................................. 115

Figure 1-111 Remove the control panel ........................................................................................................................................... 116

Figure 1-112 Remove the inner cover .............................................................................................................................................. 116

Figure 1-113 Disconnect the FFC and remove a screw .................................................................................................................. 117

Figure 1-114 Remove the scanner stay and laser scanner assembly ......................................................................................... 117

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Figure 1-115 Remove the guide ........................................................................................................................................................ 118

Figure 1-116 Remove the plate ......................................................................................................................................................... 118

Figure 1-117 Remove the guide ........................................................................................................................................................ 119

Figure 1-118 Remove the pickup roller arm .................................................................................................................................... 119

Figure 1-119 Reinstall the spring ...................................................................................................................................................... 120

Figure 1-120 Reinstall the pickup roller arm ................................................................................................................................... 120

Figure 1-121 Remove the formatter cover (MFP M28-M31) ........................................................................................................ 123

Figure 1-122 Disconnect two FFCs .................................................................................................................................................... 123

Figure 1-123 Special disassembly instructions ............................................................................................................................... 124

Figure 1-124 Remove the link arm .................................................................................................................................................... 125

Figure 1-125 Remove the link arm .................................................................................................................................................... 125

Figure 1-126 Remove the link arm .................................................................................................................................................... 126

Figure 1-127 Remove the link arm .................................................................................................................................................... 126

Figure 1-128 Remove the image scanner ........................................................................................................................................ 127

Figure 1-129 Remove the cartridge door ......................................................................................................................................... 127

Figure 1-130 Remove the top cover ................................................................................................................................................. 128

Figure 1-131 Install the pad ............................................................................................................................................................... 129

Figure 1-132 Remove the lower plate .............................................................................................................................................. 129

Figure 1-133 Remove three screws .................................................................................................................................................. 130

Figure 1-134 Remove the lower cover ............................................................................................................................................. 130

Figure 1-135 Release the FFC and remove one screw .................................................................................................................. 131

Figure 1-136 Remove the scanner stay and laser scanner assembly ......................................................................................... 131

Figure 1-137 Remove the plate ......................................................................................................................................................... 132

Figure 1-138 Remove the cartridge guide ....................................................................................................................................... 132

Figure 1-139 Remove the pickup roller arm .................................................................................................................................... 133

Figure 1-140 Reinstall the pickup roller arm ................................................................................................................................... 134

Figure 1-141 Remove transfer roller ................................................................................................................................................ 137

Figure 1-142 Install the transfer roller ............................................................................................................................................. 138

Figure 1-143 Remove the hinge link (M28-M31) ............................................................................................................................ 140

Figure 1-144 Remove two screw ....................................................................................................................................................... 143

Figure 1-145 Special disassembly instructions ............................................................................................................................... 144

Figure 1-146 Remove the link arm .................................................................................................................................................... 145

Figure 1-147 Remove the link arm .................................................................................................................................................... 145

Figure 1-148 Remove the link arm .................................................................................................................................................... 146

Figure 1-149 Remove the cartridge door ......................................................................................................................................... 146

Figure 1-150 Install the link arms on the replacement door ........................................................................................................ 147

Figure 1-151 Install the link arms on the replacement door ........................................................................................................ 147

Figure 1-152 Remove the formatter cover (M14-M17) ................................................................................................................. 148

Figure 1-153 Remove the lower plate .............................................................................................................................................. 148

Figure 1-154 Remove the three screws ........................................................................................................................................... 149

Figure 1-155 Remove the lower cover ............................................................................................................................................. 149

xiv ENWW

Figure 1-156 Fit two ribs on the printer into the grooves (lower cover install) .......................................................................... 150

Figure 1-157 Remove the formatter cover (MFP M28-M31) ........................................................................................................ 150

Figure 1-158 Disconnect two FFCs .................................................................................................................................................... 151

Figure 1-159 Special disassembly instructions ............................................................................................................................... 152

Figure 1-160 Remove the link arm .................................................................................................................................................... 153

Figure 1-161 Remove the link arm .................................................................................................................................................... 153

Figure 1-162 Remove the link arm .................................................................................................................................................... 154

Figure 1-163 Remove the link arm .................................................................................................................................................... 154

Figure 1-164 Remove the image scanner ........................................................................................................................................ 155

Figure 1-165 Remove the cartridge door ......................................................................................................................................... 155

Figure 1-166 Remove the top cover ................................................................................................................................................. 156

Figure 1-167 Install the pad ............................................................................................................................................................... 157

Figure 1-168 Remove the lower plate .............................................................................................................................................. 157

Figure 1-169 Remove three screws .................................................................................................................................................. 158

Figure 1-170 Remove the lower cover ............................................................................................................................................. 158

Figure 1-171 Remove the laser scanner and FFC ........................................................................................................................... 159

Figure 1-172 Remove two screw ....................................................................................................................................................... 162

Figure 1-173 Special disassembly instructions ............................................................................................................................... 163

Figure 1-174 Remove the link arm .................................................................................................................................................... 164

Figure 1-175 Remove the link arm .................................................................................................................................................... 164

Figure 1-176 Remove the link arm .................................................................................................................................................... 165

Figure 1-177 Remove the cartridge door ......................................................................................................................................... 165

Figure 1-178 Install the link arms on the replacement door ........................................................................................................ 166

Figure 1-179 Install the link arms on the replacement door ........................................................................................................ 166

Figure 1-180 Remove the formatter cover (M14-M17) ................................................................................................................. 167

Figure 1-181 Remove the lower plate .............................................................................................................................................. 167

Figure 1-182 Remove the three screws ........................................................................................................................................... 168

Figure 1-183 Remove the lower cover ............................................................................................................................................. 168

Figure 1-184 Fit two ribs on the printer into the grooves (lower cover install) .......................................................................... 169

Figure 1-185 Remove the formatter ................................................................................................................................................. 170

Figure 1-186 Remove the formatter cover (MFP M28-M31) ........................................................................................................ 173

Figure 1-187 Remove the formatter (MFP M28-M31) ................................................................................................................... 173

Figure 1-188 Remove two screw ....................................................................................................................................................... 176

Figure 1-189 Special disassembly instructions ............................................................................................................................... 177

Figure 1-190 Remove the link arm .................................................................................................................................................... 178

Figure 1-191 Remove the link arm .................................................................................................................................................... 178

Figure 1-192 Remove the link arm .................................................................................................................................................... 179

Figure 1-193 Remove the cartridge door ......................................................................................................................................... 179

Figure 1-194 Install the link arms on the replacement door ........................................................................................................ 180

Figure 1-195 Install the link arms on the replacement door ........................................................................................................ 180

Figure 1-196 Remove the formatter cover (M14-M17) ................................................................................................................. 181

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Figure 1-197 Remove the lower plate .............................................................................................................................................. 181

Figure 1-198 Remove the three screws ........................................................................................................................................... 182

Figure 1-199 Remove the lower cover ............................................................................................................................................. 182

Figure 1-200 Fit two ribs on the printer into the grooves (lower cover install) .......................................................................... 183

Figure 1-201 Remove the formatter ................................................................................................................................................. 184

Figure 1-202 Pressure release lever ................................................................................................................................................. 184

Figure 1-203 Rotate the pressure release levers ........................................................................................................................... 185

Figure 1-204 Remove the inner cover .............................................................................................................................................. 185

Figure 1-205 Remove the cable guide .............................................................................................................................................. 186

Figure 1-206 Remove the plate ......................................................................................................................................................... 186

Figure 1-207 Disconnect two connectors ........................................................................................................................................ 187

Figure 1-208 Release the FFC and spring ........................................................................................................................................ 187

Figure 1-209 Remove two screws ..................................................................................................................................................... 188

Figure 1-210 Right side gears and springs ...................................................................................................................................... 188

Figure 1-211 Remove the plate ......................................................................................................................................................... 189

Figure 1-212 Remove the fuser ......................................................................................................................................................... 189

Figure 1-213 Reinstall the spring (upper) ........................................................................................................................................ 190

Figure 1-214 Reinstall the spring (lowerr) ....................................................................................................................................... 190

Figure 1-215 Remove the formatter cover (MFP M28-M31) ........................................................................................................ 193

Figure 1-216 Disconnect two FFCs .................................................................................................................................................... 193

Figure 1-217 Special disassembly instructions ............................................................................................................................... 194

Figure 1-218 Remove the link arm .................................................................................................................................................... 195

Figure 1-219 Remove the link arm .................................................................................................................................................... 195

Figure 1-220 Remove the link arm .................................................................................................................................................... 196

Figure 1-221 Remove the link arm .................................................................................................................................................... 196

Figure 1-222 Remove the image scanner ........................................................................................................................................ 197

Figure 1-223 Remove the cartridge door ......................................................................................................................................... 197

Figure 1-224 Remove the top cover ................................................................................................................................................. 198

Figure 1-225 Install the pad ............................................................................................................................................................... 199

Figure 1-226 Remove the lower plate .............................................................................................................................................. 199

Figure 1-227 Remove three screws .................................................................................................................................................. 200

Figure 1-228 Remove the lower cover ............................................................................................................................................. 200

Figure 1-229 Pressure release lever ................................................................................................................................................. 201

Figure 1-230 Rotate the pressure release levers ........................................................................................................................... 201

Figure 1-231 Remove the plate ......................................................................................................................................................... 202

Figure 1-232 Disconnect two connectors ........................................................................................................................................ 202

Figure 1-233 Release the FFC and spring ........................................................................................................................................ 203

Figure 1-234 Remove two screws ..................................................................................................................................................... 203

Figure 1-235 Right side gears and springs ...................................................................................................................................... 204

Figure 1-236 Remove the plate ......................................................................................................................................................... 204

Figure 1-237 Remove the fuser ......................................................................................................................................................... 205

xvi ENWW

Figure 1-238 Reinstall the spring (lowerr) ....................................................................................................................................... 205

Figure 1-239 Remove two screw ....................................................................................................................................................... 208

Figure 1-240 Special disassembly instructions ............................................................................................................................... 209

Figure 1-241 Remove the link arm .................................................................................................................................................... 210

Figure 1-242 Remove the link arm .................................................................................................................................................... 210

Figure 1-243 Remove the link arm .................................................................................................................................................... 211

Figure 1-244 Remove the cartridge door ......................................................................................................................................... 211

Figure 1-245 Install the link arms on the replacement door ........................................................................................................ 212

Figure 1-246 Install the link arms on the replacement door ........................................................................................................ 212

Figure 1-247 Remove the formatter cover (M14-M17) ................................................................................................................. 213

Figure 1-248 Remove the lower plate .............................................................................................................................................. 213

Figure 1-249 Remove the three screws ........................................................................................................................................... 214

Figure 1-250 Remove the lower cover ............................................................................................................................................. 214

Figure 1-251 Fit two ribs on the printer into the grooves (lower cover install) .......................................................................... 215

Figure 1-252 Remove the formatter ................................................................................................................................................. 216

Figure 1-253 Pressure release lever ................................................................................................................................................. 216

Figure 1-254 Rotate the pressure release levers ........................................................................................................................... 217

Figure 1-255 Remove the inner cover .............................................................................................................................................. 217

Figure 1-256 Remove the cable guide .............................................................................................................................................. 218

Figure 1-257 Remove the plate ......................................................................................................................................................... 218

Figure 1-258 Disconnect two connectors ........................................................................................................................................ 219

Figure 1-259 Release the FFC and spring ........................................................................................................................................ 219

Figure 1-260 Remove two screws ..................................................................................................................................................... 220

Figure 1-261 Right side gears and springs ...................................................................................................................................... 220

Figure 1-262 Remove the plate ......................................................................................................................................................... 221

Figure 1-263 Remove the fuser ......................................................................................................................................................... 221

Figure 1-264 Reinstall the spring (upper) ........................................................................................................................................ 222

Figure 1-265 Reinstall the spring (lowerr) ....................................................................................................................................... 222

Figure 1-266 Pressure release lever ................................................................................................................................................. 223

Figure 1-267 Check the pressure release levers ............................................................................................................................ 223

Figure 1-268 Release the wire harnesses ........................................................................................................................................ 224

Figure 1-269 Remove the fuser cover .............................................................................................................................................. 224

Figure 1-270 Remove the pressure plate and lever ....................................................................................................................... 225

Figure 1-271 Remove the pressure plate and lever ....................................................................................................................... 225

Figure 1-272 Remove the gears ........................................................................................................................................................ 226

Figure 1-273 Release the wire harness ............................................................................................................................................ 226

Figure 1-274 Remove the fuser lm assembly ............................................................................................................................... 227

Figure 1-275 Remove the formatter cover (MFP M28-M31) ........................................................................................................ 230

Figure 1-276 Disconnect two FFCs .................................................................................................................................................... 230

Figure 1-277 Special disassembly instructions ............................................................................................................................... 231

Figure 1-278 Remove the link arm .................................................................................................................................................... 232

ENWW xvii

Figure 1-279 Remove the link arm .................................................................................................................................................... 232

Figure 1-280 Remove the link arm .................................................................................................................................................... 233

Figure 1-281 Remove the link arm .................................................................................................................................................... 233

Figure 1-282 Remove the image scanner ........................................................................................................................................ 234

Figure 1-283 Remove the cartridge door ......................................................................................................................................... 234

Figure 1-284 Remove the top cover ................................................................................................................................................. 235

Figure 1-285 Install the pad ............................................................................................................................................................... 236

Figure 1-286 Remove the lower plate .............................................................................................................................................. 236

Figure 1-287 Remove three screws .................................................................................................................................................. 237

Figure 1-288 Remove the lower cover ............................................................................................................................................. 237

Figure 1-289 Pressure release lever ................................................................................................................................................. 238

Figure 1-290 Rotate the pressure release levers ........................................................................................................................... 238

Figure 1-291 Remove the plate ......................................................................................................................................................... 239

Figure 1-292 Disconnect two connectors ........................................................................................................................................ 239

Figure 1-293 Release the FFC and spring ........................................................................................................................................ 240

Figure 1-294 Remove two screws ..................................................................................................................................................... 240

Figure 1-295 Right side gears and springs ...................................................................................................................................... 241

Figure 1-296 Remove the plate ......................................................................................................................................................... 241

Figure 1-297 Remove the fuser ......................................................................................................................................................... 242

Figure 1-298 Reinstall the spring (lowerr) ....................................................................................................................................... 242

Figure 1-299 Pressure release lever ................................................................................................................................................. 243

Figure 1-300 Check the pressure release levers ............................................................................................................................ 244

Figure 1-301 Release the wire harnesses ........................................................................................................................................ 244

Figure 1-302 Remove the fuser cover .............................................................................................................................................. 245

Figure 1-303 Remove the pressure plate and lever ....................................................................................................................... 245

Figure 1-304 Remove the pressure plate and lever ....................................................................................................................... 246

Figure 1-305 Remove the gears ........................................................................................................................................................ 246

Figure 1-306 Release the wire harness ............................................................................................................................................ 247

Figure 1-307 Remove the fuser lm assembly ............................................................................................................................... 247

Figure 1-308 Remove two screw ....................................................................................................................................................... 250

Figure 1-309 Special disassembly instructions ............................................................................................................................... 251

Figure 1-310 Remove the link arm .................................................................................................................................................... 252

Figure 1-311 Remove the link arm .................................................................................................................................................... 252

Figure 1-312 Remove the link arm .................................................................................................................................................... 253

Figure 1-313 Remove the cartridge door ......................................................................................................................................... 253

Figure 1-314 Install the link arms on the replacement door ........................................................................................................ 254

Figure 1-315 Install the link arms on the replacement door ........................................................................................................ 254

Figure 1-316 Remove the formatter cover (M14-M17) ................................................................................................................. 255

Figure 1-317 Remove the lower plate .............................................................................................................................................. 255

Figure 1-318 Remove the three screws ........................................................................................................................................... 256

Figure 1-319 Remove the lower cover ............................................................................................................................................. 256

xviii ENWW

Figure 1-320 Fit two ribs on the printer into the grooves (lower cover install) .......................................................................... 257

Figure 1-321 Remove the motor shield plate ................................................................................................................................. 257

Figure 1-322 Disconnect connectors and FFCs ............................................................................................................................... 258

Figure 1-323 Release the lever and disconnect the connector .................................................................................................... 258

Figure 1-324 Remove the engine controller assembly .................................................................................................................. 259

Figure 1-325 Check the spring ........................................................................................................................................................... 260

Figure 1-326 Remove the formatter cover (MFP M28-M31) ........................................................................................................ 263

Figure 1-327 Remove the formatter (MFP M28-M31) ................................................................................................................... 264

Figure 1-328 Disconnect two FFCs .................................................................................................................................................... 264

Figure 1-329 Special disassembly instructions ............................................................................................................................... 265

Figure 1-330 Remove the link arm .................................................................................................................................................... 266

Figure 1-331 Remove the link arm .................................................................................................................................................... 266

Figure 1-332 Remove the link arm .................................................................................................................................................... 267

Figure 1-333 Remove the link arm .................................................................................................................................................... 267

Figure 1-334 Remove the image scanner ........................................................................................................................................ 268

Figure 1-335 Remove the cartridge door ......................................................................................................................................... 268

Figure 1-336 Remove the top cover ................................................................................................................................................. 269

Figure 1-337 Install the pad ............................................................................................................................................................... 270

Figure 1-338 Remove the lower plate .............................................................................................................................................. 270

Figure 1-339 Remove three screws .................................................................................................................................................. 271

Figure 1-340 Remove the lower cover ............................................................................................................................................. 271

Figure 1-341 Remove the motor shield plate ................................................................................................................................. 272

Figure 1-342 Disconnect connectors and FFCs ............................................................................................................................... 272

Figure 1-343 Release the lever and disconnect the connector .................................................................................................... 273

Figure 1-344 Remove the engine controller assembly .................................................................................................................. 273

Figure 1-345 Check the spring ........................................................................................................................................................... 274

Figure 1-346 Remove two screw ....................................................................................................................................................... 277

Figure 1-347 Special disassembly instructions ............................................................................................................................... 278

Figure 1-348 Remove the link arm .................................................................................................................................................... 279

Figure 1-349 Remove the link arm .................................................................................................................................................... 279

Figure 1-350 Remove the link arm .................................................................................................................................................... 280

Figure 1-351 Remove the cartridge door ......................................................................................................................................... 280

Figure 1-352 Install the link arms on the replacement door ........................................................................................................ 281

Figure 1-353 Install the link arms on the replacement door ........................................................................................................ 281

Figure 1-354 Remove the formatter cover (M14-M17) ................................................................................................................. 282

Figure 1-355 Remove the lower plate .............................................................................................................................................. 282

Figure 1-356 Remove the three screws ........................................................................................................................................... 283

Figure 1-357 Remove the lower cover ............................................................................................................................................. 283

Figure 1-358 Fit two ribs on the printer into the grooves (lower cover install) .......................................................................... 284

Figure 1-359 Remove the formatter cover (MFP M28-M31) ........................................................................................................ 284

Figure 1-360 Disconnect two FFCs .................................................................................................................................................... 285

ENWW xix

Figure 1-361 Special disassembly instructions ............................................................................................................................... 286

Figure 1-362 Remove the link arm .................................................................................................................................................... 287

Figure 1-363 Remove the link arm .................................................................................................................................................... 287

Figure 1-364 Remove the link arm .................................................................................................................................................... 288

Figure 1-365 Remove the link arm .................................................................................................................................................... 288

Figure 1-366 Remove the image scanner ........................................................................................................................................ 289

Figure 1-367 Remove the cartridge door ......................................................................................................................................... 289

Figure 1-368 Remove the top cover ................................................................................................................................................. 290

Figure 1-369 Install the pad ............................................................................................................................................................... 291

Figure 1-370 Remove the lower plate .............................................................................................................................................. 291

Figure 1-371 Remove three screws .................................................................................................................................................. 292

Figure 1-372 Remove the lower cover ............................................................................................................................................. 292

Figure 1-373 Remove the door switch and FFC .............................................................................................................................. 293

Figure 1-374 Remove two screw ....................................................................................................................................................... 296

Figure 1-375 Special disassembly instructions ............................................................................................................................... 297

Figure 1-376 Remove the link arm .................................................................................................................................................... 298

Figure 1-377 Remove the link arm .................................................................................................................................................... 298

Figure 1-378 Remove the link arm .................................................................................................................................................... 299

Figure 1-379 Remove the cartridge door ......................................................................................................................................... 299

Figure 1-380 Install the link arms on the replacement door ........................................................................................................ 300

Figure 1-381 Install the link arms on the replacement door ........................................................................................................ 300

Figure 1-382 Remove the formatter cover (M14-M17) ................................................................................................................. 301

Figure 1-383 Remove the lower plate .............................................................................................................................................. 301

Figure 1-384 Remove the three screws ........................................................................................................................................... 302

Figure 1-385 Remove the lower cover ............................................................................................................................................. 302

Figure 1-386 Fit two ribs on the printer into the grooves (lower cover install) .......................................................................... 303

Figure 1-387 Remove the formatter cover (MFP M28-M31) ........................................................................................................ 303

Figure 1-388 Disconnect two FFCs .................................................................................................................................................... 304

Figure 1-389 Special disassembly instructions ............................................................................................................................... 305

Figure 1-390 Remove the link arm .................................................................................................................................................... 306

Figure 1-391 Remove the link arm .................................................................................................................................................... 306

Figure 1-392 Remove the link arm .................................................................................................................................................... 307

Figure 1-393 Remove the link arm .................................................................................................................................................... 307

Figure 1-394 Remove the image scanner ........................................................................................................................................ 308

Figure 1-395 Remove the cartridge door ......................................................................................................................................... 308

Figure 1-396 Remove the top cover ................................................................................................................................................. 309

Figure 1-397 Install the pad ............................................................................................................................................................... 310

Figure 1-398 Remove the lower plate .............................................................................................................................................. 310

Figure 1-399 Remove three screws .................................................................................................................................................. 311

Figure 1-400 Remove the lower cover ............................................................................................................................................. 311

Figure 1-401 Remove the pickup solenoid ...................................................................................................................................... 312

xx ENWW

Figure 1-402 Remove two screw ....................................................................................................................................................... 315

Figure 1-403 Special disassembly instructions ............................................................................................................................... 316

Figure 1-404 Remove the link arm .................................................................................................................................................... 317

Figure 1-405 Remove the link arm .................................................................................................................................................... 317

Figure 1-406 Remove the link arm .................................................................................................................................................... 318

Figure 1-407 Remove the cartridge door ......................................................................................................................................... 318

Figure 1-408 Install the link arms on the replacement door ........................................................................................................ 319

Figure 1-409 Install the link arms on the replacement door ........................................................................................................ 319

Figure 1-410 Remove the formatter cover (M14-M17) ................................................................................................................. 320

Figure 1-411 Remove the lower plate .............................................................................................................................................. 320

Figure 1-412 Remove the three screws ........................................................................................................................................... 321

Figure 1-413 Remove the lower cover ............................................................................................................................................. 321

Figure 1-414 Fit two ribs on the printer into the grooves (lower cover install) .......................................................................... 322

Figure 1-415 Remove the formatter ................................................................................................................................................. 323

Figure 1-416 Remove the wireless PCA (M14-M17) ...................................................................................................................... 323

Figure 1-417 Remove the formatter cover (MFP M28-M31) ........................................................................................................ 326

Figure 1-418 Remove the wireless PCA (MFP M28-M31) .............................................................................................................. 326

Figure 2-1 External panels, doors, and covers (M14-M17) ........................................................................................................... 331

Figure 2-2 External panels, doors, and covers (MFP M28-M31) .................................................................................................. 331

Figure 2-3 Main assemblies ................................................................................................................................................................ 332

Figure 2-4 Main parts ........................................................................................................................................................................... 332

Figure 2-5 PCA ...................................................................................................................................................................................... 333

Figure 2-6 Covers (M14-M17) ............................................................................................................................................................ 338

Figure 2-7 Covers (MFP M28-M31) .................................................................................................................................................... 340

Figure 2-8 Internal components (1 of 2) .......................................................................................................................................... 342

Figure 2-9 Internal components (2 of 2) .......................................................................................................................................... 344

ENWW xxi

xxii ENWW

1 Removal and replacement

●

For additional service and support

●

Removal and replacement strategy

●

Service approach

●

Order parts by authorized service providers

●

Removal and replacement procedures

ENWW 1

For additional service and support

HP service personnel, go to one of the following Web-based Interactive Search Engines (WISE) sites:

AMS

● https://support.hp.com/wise/home/ams-en

● https://support.hp.com/wise/home/ams-es

● https://support.hp.com/wise/home/ams-pt

APJ

● https://support.hp.com/wise/home/apj-en

● https://support.hp.com/wise/home/apj-ja

● https://support.hp.com/wise/home/apj-ko

● https://support.hp.com/wise/home/apj-zh-Hans

● https://support.hp.com/wise/home/apj-zh-Hant

EMEA

● https://support.hp.com/wise/home/emea-en

Channel partners, go to HP Channel Services Network (CSN) at www.hp.com/partners/csn .

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

● Install and congure

● Printer specications

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

● Solutions for printer issues and emerging issues

● Remove and replace part instructions and videos

● Service advisories

● Warranty and regulatory information

Channel partners, access training materials in the HP University and Partner Learning Center at

https://content.ext.hp.com/sites/LMS/HPU.page.

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

2 Chapter 1 Removal and replacement ENWW

Removal and replacement strategy

Introduction

The printer uses a eld repair strategy. Defective parts are diagnosed and replaced at the Field Replaceable Unit
(FRU) or Bench Repair Unit (BRU) assembly level. Repair normally begins by using the printer internal diagnostics
and the following two-step process:

1. Isolate the problem to the major system (for example, the network, server, or printer).

2. Identify the cause of failures according to the printer troubleshooting service manual and follow the

disassembly procedures to replace the defective parts or the consumable parts.

IMPORTANT: See the separate Control Panel Message Document (CPMD) for this printer for control-panel error

message descriptions and solutions (also available online).

After locating a faulty part, the printer can usually be repaired at the assembly level by replacing FRUs. Some
mechanical assemblies might need to be repaired at the subassembly level. HP does not support replacement of
components on the printed circuit assemblies (PCAs).

The user replaces supplies (toner cartridge) as they are depleted. Additional instructions about other user­replaceable parts are provided in this section.

The printer tracks the amount of use on the customer-replaceable supplies. The printer prompts the user to
replace certain items when a supply is nearly depleted.

Swapping toner cartridges between products might cause a misrepresentation of supply life values and is not
recommended.

Considerations during removal and replacement

This chapter describes the removal and replacement of FRUs/BRUs only.

Replacing FRUs/BRUs is generally the reverse of removal. Notes are included to provide directions for dicult or
critical replacement procedures.

HP does not support repairing individual subassemblies or troubleshooting to the printed-circuit assembly (PCA)
component level.

WARNING! Never operate or service the printer with the protective cover removed from the laser scanner

assembly. The reected beam, although invisible, can cause damage to the eyes.

The sheet-metal parts can have sharp edges. Be careful when handling sheet-metal parts.

Before attempting to remove or replace parts, turn the printer o and remove the power cable. Never operate
the printer with the parts removed from the printer.

Turn the printer o, wait 5 seconds, and then remove the power cord before attempting to service the printer. If
this warning is not followed, severe injury can result as well as damage to the printer. The power must be on for
certain functional checks during troubleshooting. However, the power cord must be disconnected during parts
removal. AC voltage is still present inside the printer when the power switch is in the
must be disconnected before servicing the printer.

o position. The power cord

ENWW Removal and replacement strategy 3

CAUTION: Incorrectly routed or loose wire harnesses might interfere with other internal components or

assemblies and be damaged, pinched, or frayed. Make sure that wire harnesses are correctly routed and
retained when installing assemblies.

Do not bend or fold the at exible cables (FFCs) during removal or installation. Do not straighten pre-folds in
the FFCs.

Do not expose the toner cartridge, or image drum, to strong light even for a short time.

IMPORTANT: When an assembly is removed that includes a rating plate or tag (or a printer code label), make

sure to transfer the plate or tag (or code label) to the replacement assembly.

Do not replace the formatter and engine controller simultaneously during a single printer servicing. Doing so
might cause the printer to become unstable or inoperable.

During removal, replacement, or transportation of the printer, remove the cassettes.

Some repair operations might require attening or straightening FFCs. However, try to avoid doing so. Before
inserting the FFC, examine the foil connectors for damage. FFCs must be fully seated in the connectors. Failure to
fully seat a FFC into a connector can cause a short circuit in a PCA or errors when restarting the printer. FFCs have
a line on them that is parallel to the connector body when the FFC is correctly seated.

NOTE: During assembly removal and replacement, or if the printer is moved, remove the toner cartridge.

Toner is a non-poisonous substance composed of plastic and a small number of colored components. If toner
gets on the skin or clothing, wipe it o with dry tissue paper and wash in cold water. Hot water sets toner and it
might be dicult, or impossible, to remove. Toner easily breaks down vinyl materials, so avoid letting toner
contact vinyl.

Reassembling procedures are generally the reverse of removal unless otherwise specied. Occasionally, notes
and tips are included to provide directions for dicult or critical replacement procedures.

Note the length, diameter, color, type, and location of each screw. Be sure to return each screw to its original
location during reassembly.

To install a self-tapping screw, rst turn it counterclockwise to align it with the existing thread pattern, and then
carefully turn it clockwise to tighten. Do not overtighten. If a self-tapping screw hole becomes stripped, repair
the screw-hole or replace the aected assembly.

TIP: Some gures might show assemblies removed or installed that have not yet been removed or installed at

that specic step. However, the procedures are correct for this printer and the target assembly. Always
thoroughly read the instructions that accompany each gure.

Electrostatic discharge

CAUTION:

removing printer parts. Always perform service work at an ESD-protected workstation or mat. If an ESD
workstation or mat is not available, touch the sheet-metal chassis to provide a static ground before touching an
ESD-sensitive assembly.

Protect the ESD-sensitive assemblies by placing them in ESD pouches when they are out of the printer.

Some parts are sensitive to electrostatic discharge (ESD). Look for the ESD reminder when

4 Chapter 1 Removal and replacement ENWW

Required tools

● #2 Phillips screwdriver with a magnetic tip and a 152 mm (6 in) shaft length

● Small, at-blade screwdriver

● Needle-nose pliers

● ESD strap (if one is available)

● Penlight

CAUTION: Always use a Phillips screwdriver (callout 1). Do not use a Pozidriv screwdriver (callout 2) or any

motorized screwdriver. These can damage screws or screw threads.

Figure 1-1 Screwdrivers

Fasteners used in this printer

WARNING! Make sure that assemblies are replaced with the correct screw type. Using the incorrect screw (for

example, substituting a long screw for the correct shorter screw) can cause damage to the printer or interfere
with printer operation. Do not intermix screws that are removed from one assembly with the screws that are
removed from another assembly.

NOTE: To install a self-tapping screw, rst turn it counterclockwise to align it with the existing thread pattern,

and then carefully turn it clockwise to tighten. Do not overtighten. If a self-tapping screw hole becomes stripped,
repair the screw hole or replace the aected assembly.

Always take note of the length, diameter, color, type, and location of each removed screw. Make sure that
screws are installed in the original location they were removed from during reinstallation.

ENWW Removal and replacement strategy 5

Service approach

Before performing service

● Remove all paper from the product.

● Turn o the power using the power switch.

● Unplug the power cable and interface cable or cables.

● Place the product on an ESD workstation or mat, or use an ESD strap (if one is available). If an ESD

workstation, mat, or strap is not available, ground yourself by touching the sheet-metal chassis before
touching an ESD-sensitive part.

● Remove the toner cartridge.

Accessing the secondary service menu

Use the secondary service menu to print service-related reports and run special tests.

NOTE: Access the secondary service menu by using the HP Embedded Web Server (EWS)

▲ Open the secondary service menu.

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

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

The HP Embedded Web Server is not accessible beyond the network rewall.

Open the HP EWS from the Start menu

a. Click the Start, and then click the Programs item.

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

c. After opening the HP EWS, go to the Service page, and then select the Go to Secondary Service item.

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

M14-M17 control panels: Select and hold the Resume button until the Ready light is blinking,

a.

and then release the Resume button. Find the IP address or host name of the printer on the

conguration report.

MFP M28-M311 LED control panels: Select and hold the Start Mono Copy button until the Ready

light begins blinking, and then release the Start Mono Copy button. Find the IP address or

host name of the printer on the conguration report.

6 Chapter 1 Removal and replacement ENWW

b. Open a Web browser, and in the address line, type the IP address or host name exactly as it appears

on the printer control panel or the conguration report. Press the Enter key on the computer
keyboard. The EWS opens.

NOTE: If the web browser displays a message indicating that accessing the website might not be

safe, select the option to continue to the website. Accessing this website will not harm the computer.

c. After opening the HP EWS, go to the Service page, and then select the Go to Secondary Service item.

After performing service

1. Reinstall the toner cartridge.

2. Return all paper to the input tray.

3. Plug in the power cable and turn on the printer.

4. Perform print-quality tests by printing from a host computer.

Post-service tests

Perform the following tests to verify that the repair or replacement was successful.

Print-quality test

1. Verify that you have completed the necessary reassembly steps.

2. Make sure that the input tray contains clean, unmarked paper.

3. Attach the power cord and interface cable or interface cables, and then turn on the product.

4. Verify that the expected startup sounds occur.

5. Print a conguration page, and then verify that the expected printing sounds occur.

6. Send a print job from the host computer, and then verify that the output meets expectations.

Copy quality test (MFP only)

1. Verify that you have completed the necessary reassembly steps.

2. Make sure that the input tray contains clean, unmarked paper.

3. Attach the power cord and interface cable or interface cables, and then turn on the product.

4. Verify that the expected startup sounds occur.

5. Copy a conguration page (or other page), and then verify that the expected printing sounds occur.

6. Verify that the copy output meets expectations.

Other tests

Operate the printer in a manner that exercises the specic part or parts that have been repaired or replaced.

ENWW Service approach 7

Order parts by authorized service providers

Ordering

Order supplies and paper www.hp.com/go/suresupply

Order genuine HP parts or accessories www.hp.com/buy/parts

or

partsurfer.hp.com

Order through service or support providers Contact an HP-authorized service or support provider.

Order using the HP Embedded Web Server (EWS) To access, in a supported Web browser on your computer, enter the printer IP

address or host name in the address/URL eld. The EWS contains a link to the HP
SureSupply Web site, which provides options for purchasing Original HP supplies.

Orderable parts

Not all parts can be ordered. Refer to the parts table following the exploded diagram in the parts chapter to
determine if a part is orderable.

Whole unit replacement (WUR)

HP LaserJet Pro model Whole unit replacement part number

HP LaserJet Pro M14-M17

220V M15A AP

220V M15A EMEA

220V M15w AP

220V M15w EMEA

110V M15w TW/NA

220V M15w LA

110V M15w LA

220V M16a China

220V M16a India

220V M16w India W2G53-67056

HP LaserJet Pro MFP M28-M34

220V M28a AP

220V M28a EMEA

220V M28w AP

W2G50-67056

W2G50-69056

W2G51-67056

W2G51-69056

W2G51-67055

W2G51-67019

W2G51-67020

W2G52-67056

W2G52-67001

W2G54-67056

WG54-69056

W2G55-67056

220V M28 EMEA

110V M28w TW/NA

110V M28w LA

W2G55-69058

W2G55-67055

W2G55-67020

8 Chapter 1 Removal and replacement ENWW

HP LaserJet Pro model Whole unit replacement part number

220V M29a China

220V M29a India

220V M29w India W2G57–67056

W2G56-67056

W2G56-67001

ENWW Order parts by authorized service providers 9

Supplies and accessories

Item Description Cartridge number Part number

Supplies

For use only in Europe, Russia, CIS, Mid East and Africa

HP 44A Black Toner Cartridge Standard-capacity replacement black toner

cartridge

For use only in North America, Latin America, Asia Pacic Countries/Regions (Exclude China, India)

HP 48A Black Toner Cartridge Standard-capacity replacement black toner

cartridge

For use only in China, India

HP 47A Black Toner Cartridge Standard-capacity replacement black toner

cartridge

Related documentation and software

HP service personnel, go to one of the following Web-based Interactive Search Engines (WISE) sites:

AMS

● https://support.hp.com/wise/home/ams-en

● https://support.hp.com/wise/home/ams-es

● https://support.hp.com/wise/home/ams-pt

APJ

44A CF244A

48A CF248A

47A CF247A

EMEA

● https://support.hp.com/wise/home/apj-en

● https://support.hp.com/wise/home/apj-ja

● https://support.hp.com/wise/home/apj-ko

● https://support.hp.com/wise/home/apj-zh-Hans

● https://support.hp.com/wise/home/apj-zh-Hant

● https://support.hp.com/wise/home/emea-en

Channel partners, go to HP Channel Services Network (CSN) at www.hp.com/partners/csn .

Channel partners, access training materials in the HP University and Partner Learning Center at

https://content.ext.hp.com/sites/LMS/HPU.page.

10 Chapter 1 Removal and replacement ENWW

Removal and replacement procedures

Customer self-repair (CSR) components

The CSR level indicates the expected diculty the customer will experience when removing and replacing an
assembly. The CSR A assemblies in this section are easy for the customer to remove and replace.

●

Remove and replacement: Toner cartridge (M14-M17)

●

Remove and replacement: Toner cartridge (M28-M31)

ENWW Removal and replacement procedures 11

Remove and replacement: Toner cartridge (M14-M17)

●

Introduction

●

Step 1: Remove the toner cartridge

●

Step 2: Unpack a replacement toner cartridge

●

Step 3: Install the toner cartridge

Introduction

This document provides the procedures to remove and replace the toner cartridge.

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

CAUTION: To prevent damage to the toner cartridge, do not expose it to light for more than a few minutes.

Cover the toner cartridge if it must be removed from the printer for an extended period of time.

If toner gets on clothing, wipe it o by using a dry cloth and wash the clothes in cold water. Hot water sets toner
into fabric.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Toner cartridge part numbers

M14-M17 Europe, Russia, CIS, Middle East, and Africa only:

CF244A (new)

CF244-67901 (service)

M14-M17 North America, Latin America, Asia Pacic Countries/Regions (excluding China and India) only:

CF248A (new)

CF248-67901 (service)

M14-M17 China and India only:

CF247A (new)

CF247-67901 (service)

Required tools

● No special tools are needed to remove or install this assembly.

HP 44A Black Toner Cartridge

HP 48A Black Toner Cartridge

HP 47A Black Toner Cartridge

After performing service

● Make sure that the cartridge door is fully closed after replacing the toner cartridge.

● Turn the printer power on.

12 Chapter 1 Removal and replacement ENWW

Post service test

No post service test is available for this assembly.

Step 1: Remove the toner cartridge

When a toner cartridge approaches the end of useful life, continue printing with the current cartridge until
redistributing the toner no longer yields acceptable print quality.

▲ Open the toner-cartridge door, and then remove the old toner cartridge.

Step 2: Unpack a replacement toner cartridge

1. Remove the new toner cartridge packaging. Place the used toner cartridge in the bag and box for recycling.

CAUTION: To prevent damage to the toner cartridge, hold it by both ends. Do not touch the OPC cover or

roller surface.

ENWW Removal and replacement procedures 13

2. Use the pre-paid self-addressed label to return the used cartridge to HP for recycling (where available).

Step 3: Install the toner cartridge

1. Grasp both sides of the toner cartridge and gently rock the toner cartridge to distribute the toner evenly

inside the cartridge.

14 Chapter 1 Removal and replacement ENWW

2. Bend the tab on the left side of the cartridge until the tab breaks loose, and then pull the tab until all the

tape is removed from the cartridge. Place the tab and tape in the toner-cartridge box to return for
recycling.

3. Remove the orange cover from the toner cartridge.

4. Insert the toner cartridge in the printer, and then close the toner-cartridge door.

ENWW Removal and replacement procedures 15

Remove and replacement: Toner cartridge (M28-M31)

●

Introduction

●

Step 1: Remove the toner cartridge

●

Step 2: Unpack a replacement toner cartridge

●

Step 3: Install the toner cartridge

Introduction

This document provides the procedures to remove and replace the toner cartridge.

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

CAUTION: To prevent damage to the toner cartridge, do not expose it to light for more than a few minutes.

Cover the toner cartridge if it must be removed from the printer for an extended period of time.

If toner gets on clothing, wipe it o by using a dry cloth and wash the clothes in cold water. Hot water sets toner
into fabric.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Toner cartridge part numbers

M28-M31 Europe, Russia, CIS, Middle East, and Africa only:

CF244A (new)

CF244-67901 (service)

M28-M31 North America, Latin America, Asia Pacic Countries/Regions (excluding China and India) only:

CF248A (new)

CF248-67901 (service)

M28-M31 China and India only:

CF247A (new)

CF247-67901 (service)

Required tools

● No special tools are needed to remove or install this assembly.

HP 44A Black Toner Cartridge

HP 48A Black Toner Cartridge

HP 47A Black Toner Cartridge

After performing service

● Make sure that the cartridge door is fully closed after replacing the toner cartridge.

● Turn the printer power on.

16 Chapter 1 Removal and replacement ENWW

Post service test

No post service test is available for this assembly.

Step 1: Remove the toner cartridge

When a toner cartridge approaches the end of useful life, continue printing with the current cartridge until
redistributing the toner no longer yields acceptable print quality.

▲ Open the toner-cartridge door, and then remove the old toner cartridge.

Step 2: Unpack a replacement toner cartridge

1. Remove the new toner cartridge packaging. Place the used toner cartridge in the bag and box for recycling.

CAUTION: To prevent damage to the toner cartridge, hold it by both ends. Do not touch the OPC cover or

roller surface.

ENWW Removal and replacement procedures 17

2. Use the pre-paid self-addressed label to return the used cartridge to HP for recycling (where available).

Step 3: Install the toner cartridge

1. Grasp both sides of the toner cartridge and gently rock the toner cartridge to distribute the toner evenly

inside the cartridge.

18 Chapter 1 Removal and replacement ENWW

2. Bend the tab on the left side of the cartridge until the tab breaks loose, and then pull the tab until all the

tape is removed from the cartridge. Place the tab and tape in the toner-cartridge box to return for
recycling.

3. Remove the orange cover from the toner cartridge.

4. Insert the toner cartridge in the printer, and then close the toner-cartridge door.

ENWW Removal and replacement procedures 19

Field Replaceable Units (FRUs) / Bench Repair Units (BRUs)

●

Removal and replacement: External panels, covers, and doors

●

Removal and replacement: Internal parts and assemblies

20 Chapter 1 Removal and replacement ENWW

Removal and replacement: External panels, covers, and doors

●

Remove and replacement: Tray 1

●

Remove and replacement: Cartridge door (M14-M17)

●

Remove and replacement: Document lid (M28-M31)

●

Remove and replacement: Formatter cover (M14-M17)

●

Remove and replacement: Formatter cover (MFP M28-M31)

●

Remove and replacement: Cartridge door (MFP M28-M31)

●

Remove and replacement: Image scanner (MFP M28-M31)

●

Remove and replacement: Lower cover (M14-M17)

●

Remove and replacement: Lower cover (MFP M28-M31)

●

Remove and replacement: Top cover (MFP M28-M31)

●

Remove and replacement: Control panel (M14-M17)

ENWW Removal and replacement procedures 21

Remove and replacement: Tray 1

●

Introduction

●

Step 1: Remove Tray 1

●

Step 2: Unpack the replacement assembly

Introduction

This document provides the procedures to remove and replace Tray 1.

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Tray 1 part number

RL2-2589-000CN Tray, paper pickup (base model; M14-M17)

RL2-2590-000CN Tray, paper pickup (wireless model; M14-M17)

RL2-2591-000CN Tray, paper pickup (base EM model; M14-M17)

RL2-2592-000CN Tray, paper pickup (wireless EM model; M14-M17)

RL2-2594-000CN Tray, paper pickup (base model; M28-M31)

RL2-2595-000CN Tray, paper pickup (wireless model; M28-M31)

RL2-2596-000CN Tray, paper pickup (base EM model; M28-M31)

RL2-2597-000CN Tray, paper pickup (wireless EM model; M28-M31)

Required tools

● No special tools are needed to remove or install this assembly.

After performing service

● Turn the printer power on.

Post service test

No post service test is available for this assembly.

Step 1: Remove Tray 1

▲ Open Tray 1, gently ex the tray to release two bosses (callout 1), and then remove Tray 1 (callout 2).

Reinstallation tip: Reverse the removal steps to install the assembly.

22 Chapter 1 Removal and replacement ENWW

Figure 1-2 Remove Tray 1

1

2

Step 2: Unpack the replacement assembly

1. Dispose of the defective part.

NOTE: HP recommends responsible disposal of the defective part.

www.hp.com/recycle

ENWW Removal and replacement procedures 23

2. Unpack the replacement part from the packaging.

CAUTION: If the replacement part is a roller or pad, avoid touching the spongy part of it. Skin oils on the

roller or pad can cause paper pickup and/or print-quality problems. HP recommends using disposable
gloves when handling rollers or pads or washing your hands or before touching rollers or pads.

IMPORTANT: Make sure that all of the shipping materials (for example shipping tape) are removed from

the replacement part prior to installation.

24 Chapter 1 Removal and replacement ENWW

Remove and replacement: Cartridge door (M14-M17)

●

Introduction

●

Step 1: Remove the cartridge door (M14-M17)

●

Step 2: Unpack the replacement assembly

Introduction

This document provides the procedures to remove and replace the cartridge door (M14-M17).

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Cartridge door (M14-M17) part number

RM2-2118-000CN

RM2-2119-000CN

Required tools

● #2 Phillips screwdriver with a magnetic tip

● Small at-blade screw driver (optional)

After performing service

● Make sure that the cartridge door is fully closed after replacing it.

● Turn the printer power on.

Post service test

No post service test is available for this assembly.

Step 1: Remove the cartridge door (M14-M17)

1. Open the cartridge door, and then remove two screws (callout 1).

Cartridge door (base model; M14–M17)

Cartridge door (wireless model; M14–M17)

ENWW Removal and replacement procedures 25

Figure 1-3 Remove two screw

1

26 Chapter 1 Removal and replacement ENWW

2. Before proceeding, take note of the following disassembly instructions.

1

2

3

3

2

1

When removing the link arm (callout 2) from the pressure release lever (callout 1), the pressure plate
(callout 3) might be deformed if the pressure release lever moves in the direction shown below.

CAUTION: Do not deform the pressure plate.

Figure 1-4 Special disassembly instructions

ENWW Removal and replacement procedures 27

3. Release two tabs (callout 1), and then remove one link arm (callout 3) from the pressure release lever

3

2

1

3

2

1

(callout 2).

Figure 1-5 Remove the link arm

4. Release two tabs (callout 1), and then remove one link arm (callout 3) from the pressure release lever

(callout 2).

Figure 1-6 Remove the link arm

28 Chapter 1 Removal and replacement ENWW

5. Release two tabs (callout 1), and then remove one link arm (callout 3) from the cartridge door assembly

2

3

1

1

2

(callout 2).

Figure 1-7 Remove the link arm

6. Release one tab (callout 1), support the cartridge door (callout 2), and then remove it.

NOTE: If the cartridge door is removed to access other assembly, stop at this step.

Reinstallation tip: Reverse the removal steps to install the door.

Figure 1-8 Remove the cartridge door

7. Optional step: If a replacement cartridge door is being installed, do the following:

NOTE: Install the link arms on the replacement door.

a. Release two tabs (callout 1), and then remove the one link arm (callout 3) from the door assembly

(callout 2).

ENWW Removal and replacement procedures 29

Figure 1-9 Install the link arms on the replacement door

3

2

1

3

2 1

b. Release two tabs (callout 1), and then remove the one link arm (callout 3) from the door assembly

(callout 2).

Figure 1-10 Install the link arms on the replacement door

Step 2: Unpack the replacement assembly

1. Dispose of the defective part.

NOTE: HP recommends responsible disposal of the defective part.

www.hp.com/recycle

30 Chapter 1 Removal and replacement ENWW

2. Unpack the replacement part from the packaging.

CAUTION: If the replacement part is a roller or pad, avoid touching the spongy part of it. Skin oils on the

roller or pad can cause paper pickup and/or print-quality problems. HP recommends using disposable
gloves when handling rollers or pads or washing your hands or before touching rollers or pads.

IMPORTANT: Make sure that all of the shipping materials (for example shipping tape) are removed from

the replacement part prior to installation.

ENWW Removal and replacement procedures 31

Remove and replacement: Document lid (M28-M31)

●

Introduction

●

Step 1: Remove the document lid (M28-M31)

●

Step 2: Unpack the replacement assembly

Introduction

This document provides the procedures to remove and replace the document lid (M28-M31).

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Document lid (M28-M31) part number

RM2-2136-000CN Document lid (M28-M31)

Required tools

● No special tools are needed to remove or install this assembly.

After performing service

● Make sure that the document lid is fully closed after replacing it.

● Turn the printer power on.

Post service test

No post service test is available for this assembly.

Step 1: Remove the document lid (M28-M31)

▲ Do the following:

● Open the document lid.

● Press and hold one tab (callout 1), and then slide the document lid (callout 2) as shown below to

remove it.

32 Chapter 1 Removal and replacement ENWW

Figure 1-11 Remove the document lid (M28-M31)

1

2

Step 2: Unpack the replacement assembly

1. Dispose of the defective part.

NOTE: HP recommends responsible disposal of the defective part.

www.hp.com/recycle

ENWW Removal and replacement procedures 33

2. Unpack the replacement part from the packaging.

CAUTION: If the replacement part is a roller or pad, avoid touching the spongy part of it. Skin oils on the

roller or pad can cause paper pickup and/or print-quality problems. HP recommends using disposable
gloves when handling rollers or pads or washing your hands or before touching rollers or pads.

IMPORTANT: Make sure that all of the shipping materials (for example shipping tape) are removed from

the replacement part prior to installation.

34 Chapter 1 Removal and replacement ENWW

Remove and replacement: Formatter cover (M14-M17)

●

Introduction

●

Step 1: Remove the cartridge door (M14-M17)

●

Step 2: Remove the formatter cover (M14-M17)

●

Step 3: Unpack the replacement assembly

Introduction

This document provides the procedures to remove and replace the formatter cover (M14-M17).

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Formatter cover (M14-M17) part number

RC5-4239-000CN Formatter cover (M14-M17)

Required tools

● No special tools are needed to remove or install this assembly.

After performing service

● Turn the printer power on.

Post service test

No post service test is available for this assembly.

Step 1: Remove the cartridge door (M14-M17)

1. Open the cartridge door, and then remove two screws (callout 1).

ENWW Removal and replacement procedures 35

Figure 1-12 Remove two screw

1

36 Chapter 1 Removal and replacement ENWW

2. Before proceeding, take note of the following disassembly instructions.

1

2

3

3

2

1

When removing the link arm (callout 2) from the pressure release lever (callout 1), the pressure plate
(callout 3) might be deformed if the pressure release lever moves in the direction shown below.

CAUTION: Do not deform the pressure plate.

Figure 1-13 Special disassembly instructions

ENWW Removal and replacement procedures 37

3. Release two tabs (callout 1), and then remove one link arm (callout 3) from the pressure release lever

3

2

1

3

2

1

(callout 2).

Figure 1-14 Remove the link arm

4. Release two tabs (callout 1), and then remove one link arm (callout 3) from the pressure release lever

(callout 2).

Figure 1-15 Remove the link arm

38 Chapter 1 Removal and replacement ENWW

5. Release two tabs (callout 1), and then remove one link arm (callout 3) from the cartridge door assembly

2

3

1

1

2

(callout 2).

Figure 1-16 Remove the link arm

6. Release one tab (callout 1), support the cartridge door (callout 2), and then remove it.

NOTE: If the cartridge door is removed to access other assembly, stop at this step.

Reinstallation tip: Reverse the removal steps to install the door.

Figure 1-17 Remove the cartridge door

7. Optional step: If a replacement cartridge door is being installed, do the following:

NOTE: Install the link arms on the replacement door.

a. Release two tabs (callout 1), and then remove the one link arm (callout 3) from the door assembly

(callout 2).

ENWW Removal and replacement procedures 39

Figure 1-18 Install the link arms on the replacement door

3

2

1

3

2 1

b. Release two tabs (callout 1), and then remove the one link arm (callout 3) from the door assembly

(callout 2).

Figure 1-19 Install the link arms on the replacement door

Step 2: Remove the formatter cover (M14-M17)

▲ Position the printer front side down.

Release one tab (callout 1), and then remove the formatter cover (callout 2).

Reinstallation tip: Reverse the removal steps to install the assembly.

40 Chapter 1 Removal and replacement ENWW

Figure 1-20 Remove the formatter cover (M14-M17)

1

2

Step 3: Unpack the replacement assembly

1. Dispose of the defective part.

NOTE: HP recommends responsible disposal of the defective part.

www.hp.com/recycle

ENWW Removal and replacement procedures 41

2. Unpack the replacement part from the packaging.

CAUTION: If the replacement part is a roller or pad, avoid touching the spongy part of it. Skin oils on the

roller or pad can cause paper pickup and/or print-quality problems. HP recommends using disposable
gloves when handling rollers or pads or washing your hands or before touching rollers or pads.

IMPORTANT: Make sure that all of the shipping materials (for example shipping tape) are removed from

the replacement part prior to installation.

42 Chapter 1 Removal and replacement ENWW

Remove and replacement: Formatter cover (MFP M28-M31)

●

Introduction

●

Step 1: Remove the formatter cover (MFP M28-M31)

●

Step 2: Unpack the replacement assembly

Introduction

This document provides the procedures to remove and replace the formatter cover (MFP M28-M31).

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Formatter cover (MFP M28-M31) part number

RC5-4186-000CN Formatter cover (MFP M28-M31)

Required tools

● No special tools are needed to remove or install this assembly.

After performing service

● Turn the printer power on.

Post service test

No post service test is available for this assembly.

Step 1: Remove the formatter cover (MFP M28-M31)

▲ Position the printer front side down.

Remove two screws (callout 1), and then remove the formatter cover (callout 2).

Reinstallation tip: Reverse the removal steps to install the assembly.

ENWW Removal and replacement procedures 43

Figure 1-21 Remove the formatter cover (MFP M28-M31)

1

2

Step 2: Unpack the replacement assembly

1. Dispose of the defective part.

NOTE: HP recommends responsible disposal of the defective part.

www.hp.com/recycle

44 Chapter 1 Removal and replacement ENWW

2. Unpack the replacement part from the packaging.

CAUTION: If the replacement part is a roller or pad, avoid touching the spongy part of it. Skin oils on the

roller or pad can cause paper pickup and/or print-quality problems. HP recommends using disposable
gloves when handling rollers or pads or washing your hands or before touching rollers or pads.

IMPORTANT: Make sure that all of the shipping materials (for example shipping tape) are removed from

the replacement part prior to installation.

ENWW Removal and replacement procedures 45

Remove and replacement: Cartridge door (MFP M28-M31)

●

Introduction

●

Step 1: Remove the formatter cover (MFP M28-M31)

●

Step 2: Remove the cartridge door (MFP M28-M31)

●

Step 3: Unpack the replacement assembly

Introduction

This document provides the procedures to remove and replace the cartridge door (MFP M28-M31).

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Cartridge door (MFP M28-M31) part number

RM2-2515-000CN Cartridge door (MFP M28-M31)

Required tools

● #2 Phillips screwdriver with a magnetic tip

● Small at-blade screw driver (optional)

After performing service

● Make sure that the cartridge door is fully closed after replacing it.

● Turn the printer power on.

Post service test

No post service test is available for this assembly.

Step 1: Remove the formatter cover (MFP M28-M31)

▲ Position the printer front side down.

Remove two screws (callout 1), and then remove the formatter cover (callout 2).

Reinstallation tip: Reverse the removal steps to install the assembly.

46 Chapter 1 Removal and replacement ENWW

Figure 1-22 Remove the formatter cover (MFP M28-M31)

1

2

1

Step 2: Remove the cartridge door (MFP M28-M31)

1. Disconnect two at exible cables (FFCs) (callout 1).

Figure 1-23 Disconnect two FFCs

ENWW Removal and replacement procedures 47

2. Before proceeding, take note of the following disassembly instructions.

1

2

3

3

2

1

When removing the link arm (callout 2) from the pressure release lever (callout 1), the pressure plate
(callout 3) might be deformed if the pressure release lever moves in the direction shown below.

CAUTION: Do not deform the pressure plate.

Figure 1-24 Special disassembly instructions

48 Chapter 1 Removal and replacement ENWW

3. Open the image scanner, release two tabs (callout 1), remove one link arm (callout 3) from the pressure

3

2

1

3

2

1

release lever (callout 2).

Figure 1-25 Remove the link arm

4. Release two tabs (callout 1), and then remove one link arm (callout 3) from the pressure release lever

(callout 2).

Figure 1-26 Remove the link arm

ENWW Removal and replacement procedures 49

5. Release two tabs (callout 1), and then remove one link arm (callout 3) from the cartridge door (callout 2).

2

3

1

1

2

Figure 1-27 Remove the link arm

6. Remove one link arm (callout 2) from the shaft (callout 1).

Figure 1-28 Remove the link arm

50 Chapter 1 Removal and replacement ENWW

7. Pull two at-exible cables (FFCs) (callout 2) out and away from the top cover (callout 1), and then slide the

1

3

2

image scanner (callout 3) as shown below to remove it.

CAUTION: Do not damage the FFCs.

Figure 1-29 Remove the image scanner

8. Do the following:

● Remove two link two link arms (callout 2) from the cartridge door (callout 1).

NOTE: Install the link arms on the replacement door.

● Remove two screws (callout 3).

● Remove the cartridge door (callout 1) from the image scanner (callout 4).

Reinstallation tip: Reverse the removal steps to install the assembly.

ENWW Removal and replacement procedures 51

Figure 1-30 Remove the cartridge door

1

3

3

4

4

Step 3: Unpack the replacement assembly

1. Dispose of the defective part.

NOTE: HP recommends responsible disposal of the defective part.

www.hp.com/recycle

52 Chapter 1 Removal and replacement ENWW

2. Unpack the replacement part from the packaging.

CAUTION: If the replacement part is a roller or pad, avoid touching the spongy part of it. Skin oils on the

roller or pad can cause paper pickup and/or print-quality problems. HP recommends using disposable
gloves when handling rollers or pads or washing your hands or before touching rollers or pads.

IMPORTANT: Make sure that all of the shipping materials (for example shipping tape) are removed from

the replacement part prior to installation.

ENWW Removal and replacement procedures 53

Remove and replacement: Image scanner (MFP M28-M31)

●

Introduction

●

Step 1: Remove the formatter cover (MFP M28-M31)

●

Step 2: Remove the image scanner (MFP M28-M31)

●

Step 3: Unpack the replacement assembly

Introduction

This document provides the procedures to remove and replace the image scanner (MFP M28-M31).

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Image scanner (MFP M28-M31) part number

RM2-2133-000CN

RM2-2134-000CN

RM2-2135-000CN

Image scanner (base model; MFP M28-M31)

Image scanner (wireless model; MFP M28-M31)

Image scanner (EM model; MFP M28-M31)

Required tools

● #2 Phillips screwdriver with a magnetic tip

● Small at-blade screw driver (optional)

After performing service

● Make sure that the image scanner is fully closed after replacing it.

● Turn the printer power on.

Post service test

Make a copy using the image scanner and verify print quality is acceptable.

Step 1: Remove the formatter cover (MFP M28-M31)

▲ Position the printer front side down.

Remove two screws (callout 1), and then remove the formatter cover (callout 2).

Reinstallation tip: Reverse the removal steps to install the assembly.

54 Chapter 1 Removal and replacement ENWW

Figure 1-31 Remove the formatter cover (MFP M28-M31)

1

2

1

Step 2: Remove the image scanner (MFP M28-M31)

1. Disconnect two at exible cables (FFCs) (callout 1).

Figure 1-32 Disconnect two FFCs

ENWW Removal and replacement procedures 55

2. Before proceeding, take note of the following disassembly instructions.

1

2

3

3

2

1

When removing the link arm (callout 2) from the pressure release lever (callout 1), the pressure plate
(callout 3) might be deformed if the pressure release lever moves in the direction shown below.

CAUTION: Do not deform the pressure plate.

Figure 1-33 Special disassembly instructions

56 Chapter 1 Removal and replacement ENWW

3. Open the image scanner, release two tabs (callout 1), remove one link arm (callout 3) from the pressure

3

2

1

3

2

1

release lever (callout 2).

Figure 1-34 Remove the link arm

4. Release two tabs (callout 1), and then remove one link arm (callout 3) from the pressure release lever

(callout 2).

Figure 1-35 Remove the link arm

ENWW Removal and replacement procedures 57

5. Release two tabs (callout 1), and then remove one link arm (callout 3) from the cartridge door (callout 2).

2

3

1

1

2

Figure 1-36 Remove the link arm

6. Remove one link arm (callout 2) from the shaft (callout 1).

Figure 1-37 Remove the link arm

58 Chapter 1 Removal and replacement ENWW

7. Pull two at-exible cables (FFCs) (callout 2) out and away from the top cover (callout 1), and then slide the

1

3

2

1

2

3

4

4

image scanner (callout 3) as shown below to remove it.

CAUTION: Do not damage the FFCs.

Reinstallation tip: Reverse the removal steps to install the assembly.

Figure 1-38 Remove the image scanner

8. For a replacement image scanner, do the following:

NOTE: If the image scanner is removed to access other assemblies, skip this step.

● Remove two screws (callout 1).

● Remove the cartridge door (callout 3) (with the link arms; callout 4) from the image scanner

(callout 2).

Figure 1-39 Remove the cartridge door

ENWW Removal and replacement procedures 59

Step 3: Unpack the replacement assembly

1. Dispose of the defective part.

NOTE: HP recommends responsible disposal of the defective part.

www.hp.com/recycle

2. Unpack the replacement part from the packaging.

CAUTION: If the replacement part is a roller or pad, avoid touching the spongy part of it. Skin oils on the

roller or pad can cause paper pickup and/or print-quality problems. HP recommends using disposable
gloves when handling rollers or pads or washing your hands or before touching rollers or pads.

IMPORTANT: Make sure that all of the shipping materials (for example shipping tape) are removed from

the replacement part prior to installation.

60 Chapter 1 Removal and replacement ENWW

Remove and replacement: Lower cover (M14-M17)

●

Introduction

●

Step 1: Remove the cartridge door (M14-M17)

●

Step 2: Remove the formatter cover (M14-M17)

●

Step 3: Remove the lower cover (M14-M17)

●

Step 4: Unpack the replacement assembly

Introduction

This document provides the procedures to remove and replace the lower cover (M14-M17).

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Lower cover (M14-M17) part number

RM2-2105-000CN

RM2-2104-000CN

Required tools

● #2 Phillips screwdriver with a magnetic tip

After performing service

● Turn the printer power on.

Post service test

No post service test is available for this assembly.

Step 1: Remove the cartridge door (M14-M17)

1. Open the cartridge door, and then remove two screws (callout 1).

Lower cover (base model; M14-M17)

Lower cover (wireless model; M14-M17)

ENWW Removal and replacement procedures 61

Figure 1-40 Remove two screw

1

62 Chapter 1 Removal and replacement ENWW

2. Before proceeding, take note of the following disassembly instructions.

1

2

3

3

2

1

When removing the link arm (callout 2) from the pressure release lever (callout 1), the pressure plate
(callout 3) might be deformed if the pressure release lever moves in the direction shown below.

CAUTION: Do not deform the pressure plate.

Figure 1-41 Special disassembly instructions

ENWW Removal and replacement procedures 63

3. Release two tabs (callout 1), and then remove one link arm (callout 3) from the pressure release lever

3

2

1

3

2

1

(callout 2).

Figure 1-42 Remove the link arm

4. Release two tabs (callout 1), and then remove one link arm (callout 3) from the pressure release lever

(callout 2).

Figure 1-43 Remove the link arm

64 Chapter 1 Removal and replacement ENWW

5. Release two tabs (callout 1), and then remove one link arm (callout 3) from the cartridge door assembly

2

3

1

1

2

(callout 2).

Figure 1-44 Remove the link arm

6. Release one tab (callout 1), support the cartridge door (callout 2), and then remove it.

NOTE: If the cartridge door is removed to access other assembly, stop at this step.

Reinstallation tip: Reverse the removal steps to install the door.

Figure 1-45 Remove the cartridge door

7. Optional step: If a replacement cartridge door is being installed, do the following:

NOTE: Install the link arms on the replacement door.

a. Release two tabs (callout 1), and then remove the one link arm (callout 3) from the door assembly

(callout 2).

ENWW Removal and replacement procedures 65

Figure 1-46 Install the link arms on the replacement door

3

2

1

3

2 1

b. Release two tabs (callout 1), and then remove the one link arm (callout 3) from the door assembly

(callout 2).

Figure 1-47 Install the link arms on the replacement door

Step 2: Remove the formatter cover (M14-M17)

▲ Position the printer front side down.

Release one tab (callout 1), and then remove the formatter cover (callout 2).

Reinstallation tip: Reverse the removal steps to install the assembly.

66 Chapter 1 Removal and replacement ENWW

Figure 1-48 Remove the formatter cover (M14-M17)

1

2

2

1

Step 3: Remove the lower cover (M14-M17)

1. Position the printer rear side down, remove three screws (callout 1), and then remove the lower plate

(callout 2).

Figure 1-49 Remove the lower plate

ENWW Removal and replacement procedures 67

2. Remove three screws (callout 1)

1

1

2

Figure 1-50 Remove the three screws

3. With the printer in the upright position, release one tab (callout 1), and then remove the lower cover

(callout 2).

Reinstallation tip: Reverse the removal steps to install the assembly.

Figure 1-51 Remove the lower cover

4. Reverse the removal steps to install the assembly. Also use the following special installation instructions.

NOTE: Continue to reverse the removal steps to nish installing the assembly.

Special installation instructions: Lower cover

▲ Make sure to t two ribs (callout 1) on the printer into the grooves (callout 2) in the lower cover.

68 Chapter 1 Removal and replacement ENWW

Figure 1-52 Fit two ribs on the printer into the grooves (lower cover install)

1

2

Step 4: Unpack the replacement assembly

1. Dispose of the defective part.

NOTE: HP recommends responsible disposal of the defective part.

www.hp.com/recycle

ENWW Removal and replacement procedures 69

2. Unpack the replacement part from the packaging.

CAUTION: If the replacement part is a roller or pad, avoid touching the spongy part of it. Skin oils on the

roller or pad can cause paper pickup and/or print-quality problems. HP recommends using disposable
gloves when handling rollers or pads or washing your hands or before touching rollers or pads.

IMPORTANT: Make sure that all of the shipping materials (for example shipping tape) are removed from

the replacement part prior to installation.

70 Chapter 1 Removal and replacement ENWW

Remove and replacement: Lower cover (MFP M28-M31)

●

Introduction

●

Step 1: Remove the formatter cover (MFP M28-M31)

●

Step 2: Remove the image scanner (MFP M28-M31)

●

Step 3: Remove the top cover (MFP M28-M31)

●

Step 4: Remove the lower cover (MFP M28-M31)

●

Step 5: Unpack the replacement assembly

Introduction

This document provides the procedures to remove and replace the lower cover (MFP M28-M31).

IMPORTANT: When applicable, special installation instructions are provided for an assembly at the end of the

removal procedure. Always completely read the removal instructions and follow all special installation
instructions.

Before performing service

● Turn the printer power o.

Use the table below to identify the correct part number for your printer. To order the part, go to

www.hp.com/buy/parts

Lower cover (MFP M28-M31) part number

RM2-2103-000CN Lower cover (MFP M28-M31)

Required tools

● #2 Phillips screwdriver with a magnetic tip

After performing service

● Turn the printer power on.

Post service test

No post service test is available for this assembly.

Step 1: Remove the formatter cover (MFP M28-M31)

▲ Position the printer front side down.

Remove two screws (callout 1), and then remove the formatter cover (callout 2).

Reinstallation tip: Reverse the removal steps to install the assembly.

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Figure 1-53 Remove the formatter cover (MFP M28-M31)

1

2

1

Step 2: Remove the image scanner (MFP M28-M31)

1. Disconnect two at exible cables (FFCs) (callout 1).

Figure 1-54 Disconnect two FFCs

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2. Before proceeding, take note of the following disassembly instructions.

1

2

3

3

2

1

When removing the link arm (callout 2) from the pressure release lever (callout 1), the pressure plate
(callout 3) might be deformed if the pressure release lever moves in the direction shown below.

CAUTION: Do not deform the pressure plate.

Figure 1-55 Special disassembly instructions

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3. Open the image scanner, release two tabs (callout 1), remove one link arm (callout 3) from the pressure

3

2

1

3

2

1

release lever (callout 2).

Figure 1-56 Remove the link arm

4. Release two tabs (callout 1), and then remove one link arm (callout 3) from the pressure release lever

(callout 2).

Figure 1-57 Remove the link arm

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5. Release two tabs (callout 1), and then remove one link arm (callout 3) from the cartridge door (callout 2).

2

3

1

1

2

Figure 1-58 Remove the link arm

6. Remove one link arm (callout 2) from the shaft (callout 1).

Figure 1-59 Remove the link arm

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7. Pull two at-exible cables (FFCs) (callout 2) out and away from the top cover (callout 1), and then slide the

1

3

2

1

2

3

4

4

image scanner (callout 3) as shown below to remove it.

CAUTION: Do not damage the FFCs.

Reinstallation tip: Reverse the removal steps to install the assembly.

Figure 1-60 Remove the image scanner

8. For a replacement image scanner, do the following:

NOTE: If the image scanner is removed to access other assemblies, skip this step.

● Remove two screws (callout 1).

● Remove the cartridge door (callout 3) (with the link arms; callout 4) from the image scanner

(callout 2).

Figure 1-61 Remove the cartridge door

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Step 3: Remove the top cover (MFP M28-M31)

1

2

2

3

4

1. Remove two screws (M3; callout 1), remove seven screws (M4; callout 2), release one tab (callout 3), and

then remove the top cover (callout 4).

Reinstallation tip: Reverse the removal steps to install the assembly.

Figure 1-62 Remove the top cover

2. Reverse the removal steps to install the assembly. Also use the following special installation instructions.

NOTE: Continue to reverse the removal steps to nish installing the assembly.

TIP: If the top cover is removed to access other assemblies, skip this step.

Special installation instructions: Top cover

▲ Remove the pad (callout 2) from the top cover (callout 1), and then install it on the replacement top

cover.

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Figure 1-63 Install the pad

2

1

2

1

Step 4: Remove the lower cover (MFP M28-M31)

1. Position the printer rear side down, remove two screws (callout 1), and then remove the lower plate

(callout 2)

Figure 1-64 Remove the lower plate

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