HP Color LaserJet Pro M153-M154, M253-M254, MFP M178-M181, M278-M281 Service Manual and Parts List Manual


This Service Manual contain: Repair Manual and Troubleshooting Manual HP Color LaserJet Pro M153-M154, M253-M254, MFP M178-M181, M278-M281.
Present service manual contain clear instructions and procedures on how to fix the problems occurring in your equipment.
The information contained in this repair manual is necessary for the repair, but also prevention, resulting in a longer life of your equipment.
Format of the manual: PDF, makes it easy to navigate, instant download and print. English language.
To see what contain, please read table of contents:

Content for REPAIR MANUAL:
1. REMOVAL AND REPLACEMENT
For additional service and support
Removal and replacement strategy
Introduction
Considerations during removal and replacement
Electrostatic discharge
Required tools
Fasteners used in this printer
Service approach
Before performing service
After performing service
Post service tests
Print quality test
Copy-quality test (M178-M181 and M278-M281 models)
Fax-quality test (M181 and M281 models)
Parts removal orientation
Removal and replacement procedures
Customer self-repair (CSR) A parts and assemblies
Removal and replacement: Toner cartridges
Introduction
Step 1: Remove a toner cartridge
Step 2: Unpack a replacement toner cartridge
Step 3: Install a toner cartridge
Removal and replacement: Priority feed slot tray (M253-M254 and M278-M281)
Introduction
Step 1: Remove the cassette tray
Step 2: Remove the priority feed slot tray
Step 3: Unpack the replacement assembly
Step 4: Install the priority feed slot tray
Step 5: Install the cassette tray
Removal and replacement: Cassette tray
Introduction
Step 1: Remove the cassette tray
Step 2: Unpack the replacement assembly
Step 3: Install the cassette tray
Field replaceable units (FRUs)
Removal and replacement: Rollers
Removal and replacement: Cassette tray pickup roller and feed roller
Removal and replacement: Cassette tray separation roller
Removal and replacement: Secondary transfer roller
Removal and replacement: External panels, covers, and doors
Identification and location
Removal and replacement: Right cover
Removal and replacement: Left cover
Removal and replacement: Rear cover (simplex models)
Removal and replacement: Top cover (M153-M154 and M253-M254)
Removal and replacement: Top cover (M178-M181)
Removal and replacement: Top cover (M278-M281)
Removal and replacement: Duplexer door (duplex models)
Removal and replacement: Rear lower cover (simplex models)
Removal and replacement: Rear lower cover (duplex models)
Removal and replacement: Rear door assembly (simplex models)
Removal and replacement: Rear door assembly (duplex models)
Removal and replacement: Front door assembly
Removal and replacement: Control panel (M153-M154)
Removal and replacement: Control panel (M178-M181)
Removal and replacement: Control panel (M254nw/dn 2-line)
Removal and replacement: Control panel (M254dw touchscreen)
Removal and replacement: Control panel (M278-M281 models)
Removal and replacement: Flatbed image scanner assemblies (M180n model)
Removal and replacement: Document lid (M180n)
Removal and replacement: Image scanner (M180n)
Removal and replacement: Document feeder and image scanner assemblies (M180nw and M181fw models)
Removal and replacement: Document feeder (M180nw, M181fw)
Removal and replacement: Document feeder input tray (M180nw, M181fw)
Removal and replacement: Document feeder top cover (M180nw, M181fw)
Removal and replacement: Document feeder pre-pick arm (M180nw, M181fw)
Removal and replacement: Document feeder core assembly (M180nw, M181fw)
Removal and replacement: Document feeder base assembly (M180nw, M181fw)
Removal and replacement: Image scanner (M180nw, M181fw)
Removal and replacement: Document feeder and image scanner assemblies (M278-M281 models)
Removal and replacement: Document feeder and image scanner assembly (M278-M281)
Removal and replacement: Document feeder (M278-M281)
Removal and replacement: Document feeder hinge (M278-M281)
Removal and replacement: Image scanner (M278-M281)
Removal and replacement: Image scanner lift assembly and slider pin (M278-M281)
Removal and replacement: Document feeder front cover (M278-M281)
Removal and replacement: Document feeder input tray (M278-M281)
Removal and replacement: Document feeder inner cover or outer cover (M278-M281)
Removal and replacement: Document feeder pick extension shaft (M278-M281)
Removal and replacement: Document feeder extension bearing (M278-M281)
Removal and replacement: Document feeder pick assembly (M278-M281)
Removal and replacement: Document feeder separation pad, support, and spring (M278-M281)
Removal and replacement: Document feeder core (M278-M281)
Removal and replacement: Document feeder base (M278-M281)
Removal and replacement: Document feeder flat cable (M278-M281)
Removal and replacement: Internal parts and assemblies
Removal and replacement: Wireless PCA (M153-M154, M253-M254, and M278-M281)
Removal and replacement: Wireless PCA (M178-M181)
Removal and replacement: Fax PCA (M181 and M281)
Removal and replacement: Formatter PCA (M153-M154 and M253-M254)
Removal and replacement: Formatter PCA (M178-M181 and M278-M281)
Removal and replacement: Engine controller unit (M153-M154 and M253-M254)
Removal and replacement: Engine controller unit (M178-M181 and M278-M281)
Removal and replacement: Intermediate transfer belt (ITB)
Removal and replacement: Density detect sensor assembly
Removal and replacement: Duplexing drive assembly (duplex models)
Removal and replacement: Output sensor assembly (M178-M181)
Removal and replacement: Power supply switch assembly
Removal and replacement: Low-voltage power supply (LVPS)
Removal and replacement: Fuser
Removal and replacement: Main motor
Removal and replacement: Fuser motor
Removal and replacement: Pickup motor
Removal and replacement: Main fan (M153-M154 and M253-M254)
Removal and replacement: Main fan (M178-M181 and M278-M281)

2. PARTS AND DIAGRAMS
For additional service and support
Assembly locations
Product front view (M153-M154 models)
Product back view (M153-M154 models)
Product front view (M178-M181 models)
Product back view (M178-M181 models)
Product front view (M253-M254 models)
Product back view (M253-M254 models)
Product front view (M278-M281 models)
Product back view (M278-M281 models)
How to use the parts lists and diagrams
Parts and diagrams: Image scanners and document feeders
Flatbed image scanner (M180n model only)
Image scanner and document feeder (M180nw and M181fw models only)
Image scanner and document feeder (M278-M281models only)
Parts and diagrams: Covers
Covers (M153-M154)
Covers (M178-M181)
Covers (M253-M254)
Covers (M278-M281)
Parts and diagrams: Internal components
Internal components (1 of 4)
Internal components (2 of 4)
Internal components (3 of 4)
Internal components (4 of 4)
Alphabetical parts list
Numerical parts list
INDEX

List of tables
Table 2-1 Image scanner (flatbed)
Table 2-2 Image scanner and document feeder
Table 2-3 Image scanner and document feeder (M278-M281)
Table 2-4 Covers (M153-M154)
Table 2-5 Covers (M178-M181)
Table 2-6 Covers (M253-M254)
Table 2-7 Covers (M278-M281)
Table 2-8 Internal components (1 of 4)
Table 2-9 Internal components (2 of 4)
Table 2-10 Internal components (3 of 4)
Table 2-11 Internal components (4 of 4)

List of figures
Figure 1-1 Screwdrivers
Figure 1-2 Screw size chart
Figure 1-3 Remove the cassette tray
Figure 1-4 Remove the priority feed slot tray
Figure 1-5 Install the priority feed slot tray
Figure 1-6 Install the cassette tray
Figure 1-7 Remove the cassette tray
Figure 1-8 Install the cassette tray
Figure 1-9 Remove the cassette tray
Figure 1-10 Release one tab
Figure 1-11 Remove the roller holder
Figure 1-12 Remove the rollers
Figure 1-13 Remove the cassette tray
Figure 1-14 Remove the separation roller cover
Figure 1-15 Remove the separation roller
Figure 1-16 Install the separation roller
Figure 1-17 Open the rear door
Figure 1-18 Open the duplexer door
Figure 1-19 Release the left side of the secondary transfer roller
Figure 1-20 Remove the secondary transfer roller
Figure 1-21 Front view, M153-M154
Figure 1-22 Back view, M153-M154
Figure 1-23 Front view: M178-M181
Figure 1-24 Back view: M178-M181
Figure 1-25 Front view, M253-M254
Figure 1-26 Back view, M253-M254
Figure 1-27 Front view: M278-M281
Figure 1-28 Back view: M278-M281
Figure 1-29 Remove the cassette tray
Figure 1-30 Open the front door
Figure 1-31 Open the rear door
Figure 1-32 Open the duplexer door
Figure 1-33 Tab locations
Figure 1-34 Remove one screw and release tabs
Figure 1-35 Remove the right cover
Figure 1-36 Tab locations
Figure 1-37 Remove one screw and release tabs
Figure 1-38 Remove the right cover
Figure 1-39 Remove the cassette tray
Figure 1-40 Open the front door
Figure 1-41 Open the rear door
Figure 1-42 Open the duplexer door
Figure 1-43 Tab locations
Figure 1-44 Remove one screw and release tabs
Figure 1-45 Remove the left cover
Figure 1-46 Tab locations
Figure 1-47 Remove one screw and release tab
Figure 1-48 Remove the left cover
Figure 1-49 Remove the cassette tray
Figure 1-50 Open the front door
Figure 1-51 Open the rear door
Figure 1-52 Tab locations
Figure 1-53 Remove one screw and release tabs
Figure 1-54 Remove the right cover
Figure 1-55 Tab locations
Figure 1-56 Remove one screw and release tabs
Figure 1-57 Remove the left cover
Figure 1-58 Tab locations
Figure 1-59 Remove one screw and release tabs
Figure 1-60 Remove the right cover
Figure 1-61 Tab locations
Figure 1-62 Remove one screw and release tab
Figure 1-63 Remove the left cover
Figure 1-64 Remove the rear cover
Figure 1-65 Remove the cassette tray
Figure 1-66 Open the front door
Figure 1-67 Open the rear door
Figure 1-68 Open the duplexer door
Figure 1-69 Tab locations
Figure 1-70 Remove one screw and release tabs
Figure 1-71 Remove the right cover
Figure 1-72 Tab locations
Figure 1-73 Remove one screw and release tabs
Figure 1-74 Remove the left cover
Figure 1-75 Remove the rear cover
Figure 1-76 Disconnect one connector
Figure 1-77 Remove two screws and the guide
Figure 1-78 Remove two screws
Figure 1-79 Remove three screws and the top cover
Figure 1-80 Remove two screws and the cover
Figure 1-81 Disconnect one cable and remove the control panel
Figure 1-82 Release the flat cable
Figure 1-83 Remove three screws and release the cable
Figure 1-84 Remove the bracket
Figure 1-85 Remove the control panel
Figure 1-86 Remove the cassette tray
Figure 1-87 Open the front door
Figure 1-88 Open the rear door
Figure 1-89 Tab locations
Figure 1-90 Remove one screw and release tabs
Figure 1-91 Remove the right cover
Figure 1-92 Tab locations
Figure 1-93 Remove one screw and release tab
Figure 1-94 Remove the left cover
Figure 1-95 Remove the rear cover
Figure 1-96 Disconnect one flat cable
Figure 1-97 Release one tab and rotate the slider pin
Figure 1-98 Remove the slider pin
Figure 1-99 Rotate the hinge arm
Figure 1-100 Remove the scanner cable cover
Figure 1-101 Release the flat cable
Figure 1-102 Remove the scanner assembly
Figure 1-103 Disconnect two cables and remove one screw
Figure 1-104 Release one tab and rotate the slider pin
Figure 1-105 Remove the slider pin
Figure 1-106 Rotate the hinge arm down
Figure 1-107 Remove the scanner cable cover
Figure 1-108 Release the flat cable
Figure 1-109 Remove the scanner assembly
Figure 1-110 Remove one screw
Figure 1-111 Rotate the hinge arm up
Figure 1-112 Remove the cover
Figure 1-113 Remove the control panel
Figure 1-114 Disconnect one connector
Figure 1-115 Disconnect one cable
Figure 1-116 Remove seven screws and the top cover
Figure 1-117 Remove the cassette tray
Figure 1-118 Open the front door
Figure 1-119 Open the rear door
Figure 1-120 Open the duplexer door
Figure 1-121 Tab locations
Figure 1-122 Remove one screw and release tabs
Figure 1-123 Remove the right cover
Figure 1-124 Tab locations
Figure 1-125 Remove one screw and release tab
Figure 1-126 Remove the left cover
Figure 1-127 Remove the rear cover
Figure 1-128 Open the scanner
Figure 1-129 Remove one screw and the cover
Figure 1-130 Remove three screws
Figure 1-131 Rotate the control panel
Figure 1-132 Release two tabs
Figure 1-133 Release the control panel
Figure 1-134 Disconnect the flat cable
Figure 1-135 Disconnect two cables and remove one screw
Figure 1-136 Release one tab and rotate the slider pin
Figure 1-137 Remove the slider pin
Figure 1-138 Rotate the hinge arm down
Figure 1-139 Remove the scanner cable cover
Figure 1-140 Release the flat cable
Figure 1-141 Remove the scanner assembly
Figure 1-142 Disconnect two cables
Figure 1-143 Remove one screw
Figure 1-144 Remove one screw
Figure 1-145 Remove seven screws and the top cover
Figure 1-146 Open the duplexer door
Figure 1-147 Remove two screws and holders
Figure 1-148 Rotate the shaft
Figure 1-149 Remove the shaft
Figure 1-150 Remove the duplexer door
Figure 1-151 Remove the cassette tray
Figure 1-152 Open the front door
Figure 1-153 Open the rear door
Figure 1-154 Tab locations
Figure 1-155 Remove one screw and release tabs
Figure 1-156 Remove the left cover
Figure 1-157 Tab locations
Figure 1-158 Remove one screw and release tab
Figure 1-159 Remove the left cover
Figure 1-160 Close the rear door
Figure 1-161 Remove the rear lower cover (simplex models)
Figure 1-162 Remove the cassette tray
Figure 1-163 Open the front door
Figure 1-164 Open the duplexer door
Figure 1-165 Tab locations
Figure 1-166 Remove one screw and release tabs
Figure 1-167 Remove the right cover
Figure 1-168 Tab locations
Figure 1-169 Remove one screw and release tabs
Figure 1-170 Remove the left cover
Figure 1-171 Tab locations
Figure 1-172 Remove one screw and release tabs
Figure 1-173 Remove the right cover
Figure 1-174 Tab locations
Figure 1-175 Remove one screw and release tab
Figure 1-176 Remove the left cover
Figure 1-177 Close the duplexer door
Figure 1-178 Release one tab
Figure 1-179 Release three tabs and remove the cover
Figure 1-180 Remove the cassette tray
Figure 1-181 Open the front door
Figure 1-182 Open the rear door
Figure 1-183 Tab locations
Figure 1-184 Remove one screw and release tabs
Figure 1-185 Remove the left cover
Figure 1-186 Tab locations
Figure 1-187 Remove one screw and release tab
Figure 1-188 Remove the left cover
Figure 1-189 Close the rear door
Figure 1-190 Remove the rear lower cover (simplex models)
Figure 1-191 Remove two screws
Figure 1-192 Remove the shaft holder
Figure 1-193 Remove the rear door assembly
Figure 1-194 Remove the cassette tray
Figure 1-195 Open the front door
Figure 1-196 Open the duplexer door
Figure 1-197 Tab locations
Figure 1-198 Remove one screw and release tabs
Figure 1-199 Remove the right cover
Figure 1-200 Tab locations
Figure 1-201 Remove one screw and release tabs
Figure 1-202 Remove the left cover
Figure 1-203 Tab locations
Figure 1-204 Remove one screw and release tabs
Figure 1-205 Remove the right cover
Figure 1-206 Tab locations
Figure 1-207 Remove one screw and release tab
Figure 1-208 Remove the left cover
Figure 1-209 Close the duplexer door
Figure 1-210 Release one tab
Figure 1-211 Release three tabs and remove the cover
Figure 1-212 Remove two screws and holders
Figure 1-213 Rotate the shaft
Figure 1-214 Remove the shaft
Figure 1-215 Remove the duplexer door
Figure 1-216 Remove three screws and the cover
Figure 1-217 Remove the rear door assembly
Figure 1-218 Remove the cassette tray
Figure 1-219 Release the right support arm bracket
Figure 1-220 Release the left support arm bracket
Figure 1-221 Remove the cassette tray
Figure 1-222 Open the front door
Figure 1-223 Open the rear door
Figure 1-224 Tab locations
Figure 1-225 Remove one screw and release tabs
Figure 1-226 Remove the right cover
Figure 1-227 Tab locations
Figure 1-228 Remove one screw and release tabs
Figure 1-229 Remove the left cover
Figure 1-230 Remove the rear cover
Figure 1-231 Disconnect one connector
Figure 1-232 Remove two screws and the guide
Figure 1-233 Remove two screws
Figure 1-234 Remove three screws and the top cover
Figure 1-235 Remove two screws and the cover
Figure 1-236 Disconnect one cable and remove the control panel
Figure 1-237 Remove the cassette tray
Figure 1-238 Open the front door
Figure 1-239 Open the rear door
Figure 1-240 Tab locations
Figure 1-241 Remove one screw and release tabs
Figure 1-242 Remove the right cover
Figure 1-243 Tab locations
Figure 1-244 Remove one screw and release tab
Figure 1-245 Remove the left cover
Figure 1-246 Disconnect one flat cable
Figure 1-247 Release one tab and rotate the slider pin
Figure 1-248 Remove the slider pin
Figure 1-249 Rotate the hinge arm
Figure 1-250 Remove the scanner cable cover
Figure 1-251 Release the flat cable
Figure 1-252 Remove the scanner assembly
Figure 1-253 Disconnect two cables and remove one screw
Figure 1-254 Release one tab and rotate the slider pin
Figure 1-255 Remove the slider pin
Figure 1-256 Rotate the hinge arm down
Figure 1-257 Remove the scanner cable cover
Figure 1-258 Release the flat cable
Figure 1-259 Remove the scanner assembly
Figure 1-260 Remove one screw
Figure 1-261 Rotate the hinge arm up
Figure 1-262 Remove the cover
Figure 1-263 Remove the control panel
Figure 1-264 Disconnect one connector
Figure 1-265 Remove the cassette tray
Figure 1-266 Open the front door
Figure 1-267 Open the rear door
Figure 1-268 Open the duplexer door
Figure 1-269 Tab locations
Figure 1-270 Remove one screw and release tabs
Figure 1-271 Remove the right cover
Figure 1-272 Tab locations
Figure 1-273 Remove one screw and release tabs
Figure 1-274 Remove the left cover
Figure 1-275 Remove the rear cover
Figure 1-276 Disconnect one connector
Figure 1-277 Remove two screws and the guide
Figure 1-278 Remove two screws
Figure 1-279 Remove three screws and the top cover
Figure 1-280 Remove two screws and the cover
Figure 1-281 Disconnect one cable and remove one screw
Figure 1-282 Remove the cassette tray
Figure 1-283 Open the front door
Figure 1-284 Open the duplexer door
Figure 1-285 Tab locations
Figure 1-286 Remove one screw and release tabs
Figure 1-287 Remove the right cover
Figure 1-288 Tab locations
Figure 1-289 Remove one screw and release tabs
Figure 1-290 Remove the left cover
Figure 1-291 Remove the rear cover
Figure 1-292 Disconnect one connector
Figure 1-293 Remove two screws and the guide
Figure 1-294 Remove two screws
Figure 1-295 Remove three screws and the top cover
Figure 1-296 Release the flat cable
Figure 1-297 Remove three screws and release the cable
Figure 1-298 Remove the bracket
Figure 1-299 Remove the control panel
Figure 1-300 Open the scanner
Figure 1-301 Remove one screw and the cover
Figure 1-302 Remove three screws
Figure 1-303 Rotate the control panel
Figure 1-304 Release two tabs
Figure 1-305 Release the control panel
Figure 1-306 Disconnect the flat cable
Figure 1-307 Remove the document lid
Figure 1-308 Remove the cassette tray
Figure 1-309 Open the front door
Figure 1-310 Open the rear door
Figure 1-311 Tab locations
Figure 1-312 Remove one screw and release tab
Figure 1-313 Remove the left cover
Figure 1-314 Remove the document lid
Figure 1-315 Disconnect one flat cable
Figure 1-316 Release one tab and rotate the slider pin
Figure 1-317 Remove the slider pin
Figure 1-318 Rotate the hinge arm
Figure 1-319 Remove the scanner cable cover
Figure 1-320 Release the flat cable
Figure 1-321 Remove the scanner assembly
Figure 1-322 Remove the cassette tray
Figure 1-323 Open the front door
Figure 1-324 Open the rear door
Figure 1-325 Tab locations
Figure 1-326 Remove one screw and release tab
Figure 1-327 Remove the left cover
Figure 1-328 Disconnect two cables and remove one screw
Figure 1-329 Release one tab and rotate the slider pin
Figure 1-330 Remove the slider pin
Figure 1-331 Rotate the hinge arm down
Figure 1-332 Remove the scanner cable cover
Figure 1-333 Release the flat cable
Figure 1-334 Remove the scanner assembly
Figure 1-335 Release two tabs
Figure 1-336 Remove the document feeder
Figure 1-337 Open the document feeder top cover
Figure 1-338 Raise the input tray
Figure 1-339 Remove the document feeder input tray
Figure 1-340 Open the document feeder top cover
Figure 1-341 Release one tab
Figure 1-342 Remove the document feeder top cover
Figure 1-343 Open the document feeder top cover
Figure 1-344 Release one tab
Figure 1-345 Remove the document feeder top cover
Figure 1-346 Note the pre-pick arm drive gear
Figure 1-347 Remove the document feeder pre-pick arm
Figure 1-348 Remove the cassette tray
Figure 1-349 Open the front door
Figure 1-350 Open the rear door
Figure 1-351 Tab locations
Figure 1-352 Remove one screw and release tab
Figure 1-353 Remove the left cover
Figure 1-354 Disconnect two cables and remove one screw
Figure 1-355 Release one tab and rotate the slider pin
Figure 1-356 Remove the slider pin
Figure 1-357 Rotate the hinge arm down
Figure 1-358 Remove the scanner cable cover
Figure 1-359 Release the flat cable
Figure 1-360 Remove the scanner assembly
Figure 1-361 Open the document feeder top cover
Figure 1-362 Release one tab
Figure 1-363 Remove the document feeder top cover
Figure 1-364 Release the document feeder core assembly
Figure 1-365 Remove the document feeder core assembly
Figure 1-366 Remove the cassette tray
Figure 1-367 Open the front door
Figure 1-368 Open the rear door
Figure 1-369 Tab locations
Figure 1-370 Remove one screw and release tab
Figure 1-371 Remove the left cover
Figure 1-372 Disconnect two cables and remove one screw
Figure 1-373 Release one tab and rotate the slider pin
Figure 1-374 Remove the slider pin
Figure 1-375 Rotate the hinge arm down
Figure 1-376 Remove the scanner cable cover
Figure 1-377 Release the flat cable
Figure 1-378 Remove the scanner assembly
Figure 1-379 Open the document feeder top cover
Figure 1-380 Release one tab
Figure 1-381 Remove the document feeder top cover
Figure 1-382 Release the document feeder core assembly
Figure 1-383 Remove the document feeder core assembly
Figure 1-384 Release two tabs
Figure 1-385 Remove the cassette tray
Figure 1-386 Open the front door
Figure 1-387 Open the rear door
Figure 1-388 Tab locations
Figure 1-389 Remove one screw and release tab
Figure 1-390 Remove the left cover
Figure 1-391 Disconnect two cables and remove one screw
Figure 1-392 Release one tab and rotate the slider pin
Figure 1-393 Remove the slider pin
Figure 1-394 Rotate the hinge arm down
Figure 1-395 Remove the scanner cable cover
Figure 1-396 Release the flat cable
Figure 1-397 Remove the scanner assembly
Figure 1-398 Release two tabs
Figure 1-399 Remove the document feeder
Figure 1-400 Remove the cassette tray
Figure 1-401 Open the front door
Figure 1-402 Open the rear door
Figure 1-403 Open the duplexer door
Figure 1-404 Tab locations
Figure 1-405 Remove one screw and release tab
Figure 1-406 Remove the left cover
Figure 1-407 Disconnect two cables and remove one screw
Figure 1-408 Release one tab and rotate the slider pin
Figure 1-409 Remove the slider pin
Figure 1-410 Rotate the hinge arm down
Figure 1-411 Remove the scanner cable cover
Figure 1-412 Release the flat cable
Figure 1-413 Remove the scanner assembly
Figure 1-414 Remove the cassette tray
Figure 1-415 Open the front door
Figure 1-416 Open the rear door
Figure 1-417 Open the duplexer door
Figure 1-418 Tab locations
Figure 1-419 Remove one screw and release tab
Figure 1-420 Remove the left cover
Figure 1-421 Disconnect two cables and remove one screw
Figure 1-422 Release one tab and rotate the slider pin
Figure 1-423 Remove the slider pin
Figure 1-424 Rotate the hinge arm down
Figure 1-425 Remove the scanner cable cover
Figure 1-426 Release the flat cable
Figure 1-427 Remove the scanner assembly
Figure 1-428 Remove one screw
Figure 1-429 Open the top cover
Figure 1-430 Remove one screw
Figure 1-431 Remove the document feeder
Figure 1-432 Remove the cassette tray
Figure 1-433 Open the front door
Figure 1-434 Open the rear door
Figure 1-435 Open the duplexer door
Figure 1-436 Tab locations
Figure 1-437 Remove one screw and release tab
Figure 1-438 Remove the left cover
Figure 1-439 Disconnect two cables and remove one screw
Figure 1-440 Release one tab and rotate the slider pin
Figure 1-441 Remove the slider pin
Figure 1-442 Rotate the hinge arm down
Figure 1-443 Remove the scanner cable cover
Figure 1-444 Release the flat cable
Figure 1-445 Remove the scanner assembly
Figure 1-446 Remove one screw
Figure 1-447 Open the top cover
Figure 1-448 Remove one screw
Figure 1-449 Remove the document feeder
Figure 1-450 Remove the hinge
Figure 1-451 Remove the cassette tray
Figure 1-452 Open the front door
Figure 1-453 Open the rear door
Figure 1-454 Open the duplexer door
Figure 1-455 Tab locations
Figure 1-456 Remove one screw and release tab
Figure 1-457 Remove the left cover
Figure 1-458 Disconnect two cables and remove one screw
Figure 1-459 Release one tab and rotate the slider pin
Figure 1-460 Remove the slider pin
Figure 1-461 Rotate the hinge arm down
Figure 1-462 Remove the scanner cable cover
Figure 1-463 Release the flat cable
Figure 1-464 Remove the scanner assembly
Figure 1-465 Remove one screw
Figure 1-466 Open the top cover
Figure 1-467 Remove one screw
Figure 1-468 Remove the document feeder
Figure 1-469 Release one tab and rotate the slider pin
Figure 1-470 Remove the slider pin
Figure 1-471 Lower the support arm
Figure 1-472 Before proceeding take note
Figure 1-473 Remove one screw
Figure 1-474 Remove the support arm
Figure 1-475 Open the document feeder top cover
Figure 1-476 Release the hinge
Figure 1-477 Remove two screws
Figure 1-478 Remove the front cover
Figure 1-479 Open the document feeder top cover
Figure 1-480 Release the hinge
Figure 1-481 Remove two screws
Figure 1-482 Remove the front cover
Figure 1-483 Remove four screws
Figure 1-484 Remove the input tray
Figure 1-485 Open the document feeder top cover
Figure 1-486 Release the hinge
Figure 1-487 Release the front hinge
Figure 1-488 Release the back hinge
Figure 1-489 Release three tabs
Figure 1-490 Remove the inner cover
Figure 1-491 Open the document feeder top cover
Figure 1-492 Release the hinge
Figure 1-493 Release the front hinge
Figure 1-494 Release the back hinge
Figure 1-495 Remove the pick extension shaft
Figure 1-496 Open the document feeder top cover
Figure 1-497 Release the hinge
Figure 1-498 Release the front hinge
Figure 1-499 Release the back hinge
Figure 1-500 Remove the pick extension shaft
Figure 1-501 Locate the extension bearing
Figure 1-502 Release two tabs
Figure 1-503 Remove the bearing
Figure 1-504 Open the document feeder top cover
Figure 1-505 Release the hinge
Figure 1-506 Release the front hinge
Figure 1-507 Release the back hinge
Figure 1-508 Remove the pick extension shaft
Figure 1-509 Note the gear and spring locations
Figure 1-510 Remove the pick assembly
Figure 1-511 Open the document feeder top cover
Figure 1-512 Release the hinge
Figure 1-513 Release the separation pad support
Figure 1-514 Remove the separation pad and support
Figure 1-515 Remove the separation pad
Figure 1-516 Remove the separation pad spring
Figure 1-517 Open the document feeder top cover
Figure 1-518 Release the hinge
Figure 1-519 Remove two screws
Figure 1-520 Remove the front cover
Figure 1-521 Remove four screws
Figure 1-522 Remove the input tray
Figure 1-523 Disconnect two connectors
Figure 1-524 Release the hinge
Figure 1-525 Rotate the core assembly
Figure 1-526 Remove the core assembly
Figure 1-527 Remove the cassette tray
Figure 1-528 Open the front door
Figure 1-529 Open the rear door
Figure 1-530 Open the duplexer door
Figure 1-531 Tab locations
Figure 1-532 Remove one screw and release tab
Figure 1-533 Remove the left cover
Figure 1-534 Disconnect two cables and remove one screw
Figure 1-535 Release one tab and rotate the slider pin
Figure 1-536 Remove the slider pin
Figure 1-537 Rotate the hinge arm down
Figure 1-538 Remove the scanner cable cover
Figure 1-539 Release the flat cable
Figure 1-540 Remove the scanner assembly
Figure 1-541 Open the document feeder top cover
Figure 1-542 Release the hinge
Figure 1-543 Remove two screws
Figure 1-544 Remove the front cover
Figure 1-545 Remove four screws
Figure 1-546 Remove the input tray
Figure 1-547 Disconnect two connectors
Figure 1-548 Release the hinge
Figure 1-549 Rotate the core assembly
Figure 1-550 Remove the core assembly
Figure 1-551 Release the front hinge
Figure 1-552 Release the back hinge
Figure 1-553 Remove one screw
Figure 1-554 Remove one screw
Figure 1-555 Remove the document feeder base
Figure 1-556 Locate the connector holder
Figure 1-557 Remove one screw
Figure 1-558 Remove the connector holder
Figure 1-559 Remove the cassette tray
Figure 1-560 Open the front door
Figure 1-561 Open the rear door
Figure 1-562 Open the duplexer door
Figure 1-563 Tab locations
Figure 1-564 Remove one screw and release tab
Figure 1-565 Remove the left cover
Figure 1-566 Disconnect two cables and remove one screw
Figure 1-567 Release one tab and rotate the slider pin
Figure 1-568 Remove the slider pin
Figure 1-569 Rotate the hinge arm down
Figure 1-570 Remove the scanner cable cover
Figure 1-571 Release the flat cable
Figure 1-572 Remove the scanner assembly
Figure 1-573 Open the document feeder top cover
Figure 1-574 Release the hinge
Figure 1-575 Remove two screws
Figure 1-576 Remove the front cover
Figure 1-577 Remove four screws
Figure 1-578 Remove the input tray
Figure 1-579 Disconnect two connectors
Figure 1-580 Release the hinge
Figure 1-581 Rotate the core assembly
Figure 1-582 Remove the core assembly
Figure 1-583 Release the front hinge
Figure 1-584 Release the back hinge
Figure 1-585 Remove one screw
Figure 1-586 Remove one screw
Figure 1-587 Remove the document feeder base
Figure 1-588 Locate the connector holder
Figure 1-589 Remove one screw
Figure 1-590 Remove the connector holder
Figure 1-591 Remove the flat cable
Figure 1-592 Remove the cassette tray
Figure 1-593 Open the front door
Figure 1-594 Open the rear door
Figure 1-595 Open the duplexer door
Figure 1-596 Tab locations
Figure 1-597 Remove one screw and release tabs
Figure 1-598 Remove the left cover
Figure 1-599 Tab locations
Figure 1-600 Remove one screw and release tab
Figure 1-601 Remove the left cover
Figure 1-602 Remove the wireless PCA
Figure 1-603 Remove the cassette tray
Figure 1-604 Open the front door
Figure 1-605 Open the rear door
Figure 1-606 Tab locations
Figure 1-607 Remove one screw and release tab
Figure 1-608 Remove the left cover
Figure 1-609 Remove the wireless PCA
Figure 1-610 Remove the cassette tray
Figure 1-611 Open the front door
Figure 1-612 Open the rear door
Figure 1-613 Open the duplexer door
Figure 1-614 Tab locations
Figure 1-615 Remove one screw and release tab
Figure 1-616 Remove the left cover
Figure 1-617 Remove the M277 fax PCA
Figure 1-618 Remove the cassette tray
Figure 1-619 Open the front door
Figure 1-620 Open the rear door
Figure 1-621 Open the duplexer door
Figure 1-622 Tab locations
Figure 1-623 Remove one screw and release tabs
Figure 1-624 Remove the left cover
Figure 1-625 Remove the wireless PCA
Figure 1-626 Disconnect all connectors
Figure 1-627 Remove the formatter PCA (2 of 2)
Figure 1-628 Remove the cassette tray
Figure 1-629 Open the front door
Figure 1-630 Open the rear door
Figure 1-631 Open the duplexer door
Figure 1-632 Tab locations
Figure 1-633 Remove one screw and release tab
Figure 1-634 Remove the left cover
Figure 1-635 Remove the wireless PCA
Figure 1-636 Remove the wireless PCA
Figure 1-637 Disconnect all connectors
Figure 1-638 Remove four screws
Figure 1-639 Remove the cassette tray
Figure 1-640 Open the front door
Figure 1-641 Open the rear door
Figure 1-642 Open the duplexer door
Figure 1-643 Tab locations
Figure 1-644 Remove one screw and release tabs
Figure 1-645 Remove the left cover
Figure 1-646 Disconnect all connectors
Figure 1-647 Remove five screws and release four tabs
Figure 1-648 Remove the cassette tray
Figure 1-649 Open the front door
Figure 1-650 Open the rear door
Figure 1-651 Open the duplexer door
Figure 1-652 Tab locations
Figure 1-653 Remove one screw and release tab
Figure 1-654 Remove the left cover
Figure 1-655 Remove the wireless PCA
Figure 1-656 Remove the wireless PCA
Figure 1-657 Disconnect all connectors
Figure 1-658 Remove four screws
Figure 1-659 Disconnect one connector and remove nine screws
Figure 1-660 Disconnect all connectors
Figure 1-661 Remove four screws and release four tabs
Figure 1-662 Remove the cassette tray
Figure 1-663 Remove the priority feed slot tray
Figure 1-664 Open the front door
Figure 1-665 Open the rear door
Figure 1-666 Open the duplexer door
Figure 1-667 Tab locations
Figure 1-668 Remove one screw and release tabs
Figure 1-669 Remove the right cover
Figure 1-670 Tab locations
Figure 1-671 Remove one screw and release tabs
Figure 1-672 Remove the left cover
Figure 1-673 Tab locations
Figure 1-674 Remove one screw and release tabs
Figure 1-675 Remove the right cover
Figure 1-676 Tab locations
Figure 1-677 Remove one screw and release tab
Figure 1-678 Remove the left cover
Figure 1-679 Remove two screws and holders
Figure 1-680 Rotate the shaft
Figure 1-681 Remove the shaft
Figure 1-682 Remove the duplexer door
Figure 1-683 Remove three screws and the cover
Figure 1-684 Remove the rear door assembly
Figure 1-685 Remove two screws
Figure 1-686 Remove the shaft holder
Figure 1-687 Remove the rear door assembly
Figure 1-688 Release one tab
Figure 1-689 Release one tab
Figure 1-690 Release and rotate one tab
Figure 1-691 Loosen the shaft
Figure 1-692 Remove the ITB (4 of 8)
Figure 1-693 Remove the ITB (5 of 8)
Figure 1-694 Remove two screws
Figure 1-695 Remove the ITB
Figure 1-696 Remove the cassette tray
Figure 1-697 Remove the priority feed slot tray
Figure 1-698 Open the front door
Figure 1-699 Open the rear door
Figure 1-700 Open the duplexer door
Figure 1-701 Tab locations
Figure 1-702 Remove one screw and release tabs
Figure 1-703 Remove the right cover
Figure 1-704 Tab locations
Figure 1-705 Remove one screw and release tabs
Figure 1-706 Remove the left cover
Figure 1-707 Tab locations
Figure 1-708 Remove one screw and release tabs
Figure 1-709 Remove the right cover
Figure 1-710 Tab locations
Figure 1-711 Remove one screw and release tab
Figure 1-712 Remove the left cover
Figure 1-713 Remove two screws and holders
Figure 1-714 Rotate the shaft
Figure 1-715 Remove the shaft
Figure 1-716 Remove the duplexer door
Figure 1-717 Remove three screws and the cover
Figure 1-718 Remove the rear door assembly
Figure 1-719 Remove two screws
Figure 1-720 Remove the shaft holder
Figure 1-721 Remove the rear door assembly
Figure 1-722 Release one tab
Figure 1-723 Release one tab
Figure 1-724 Release and rotate one tab
Figure 1-725 Loosen the shaft
Figure 1-726 Remove the ITB (4 of 8)
Figure 1-727 Remove the ITB (5 of 8)
Figure 1-728 Remove two screws
Figure 1-729 Remove the ITB
Figure 1-730 Disconnect one connector
Figure 1-731 Remove the registration density sensor
Figure 1-732 Remove the cassette tray
Figure 1-733 Open the front door
Figure 1-734 Open the duplexer door
Figure 1-735 Tab locations
Figure 1-736 Remove one screw and release tabs
Figure 1-737 Remove the right cover
Figure 1-738 Tab locations
Figure 1-739 Remove one screw and release tabs
Figure 1-740 Remove the left cover
Figure 1-741 Tab locations
Figure 1-742 Remove one screw and release tabs
Figure 1-743 Remove the right cover
Figure 1-744 Tab locations
Figure 1-745 Remove one screw and release tab
Figure 1-746 Remove the left cover
Figure 1-747 Open the scanner
Figure 1-748 Remove one screw and the cover
Figure 1-749 Remove three screws
Figure 1-750 Rotate the control panel
Figure 1-751 Release two tabs
Figure 1-752 Release the control panel
Figure 1-753 Disconnect the flat cable
Figure 1-754 Disconnect two cables and remove one screw
Figure 1-755 Release one tab and rotate the slider pin
Figure 1-756 Remove the slider pin
Figure 1-757 Rotate the hinge arm down
Figure 1-758 Remove the scanner cable cover
Figure 1-759 Release the flat cable
Figure 1-760 Remove the scanner assembly
Figure 1-761 Disconnect one cable
Figure 1-762 Remove seven screws and the top cover
Figure 1-763 Disconnect one connector
Figure 1-764 Remove two screws and the guide
Figure 1-765 Remove two screws
Figure 1-766 Remove three screws and the top cover
Figure 1-767 Remove the cover
Figure 1-768 Remove two screws
Figure 1-769 Disconnect two connectors
Figure 1-770 Remove the duplex drive assembly
Figure 1-771 Remove the cassette tray
Figure 1-772 Open the front door
Figure 1-773 Open the rear door
Figure 1-774 Tab locations
Figure 1-775 Remove one screw and release tabs
Figure 1-776 Remove the right cover
Figure 1-777 Tab locations
Figure 1-778 Remove one screw and release tab
Figure 1-779 Remove the left cover
Figure 1-780 Disconnect one flat cable
Figure 1-781 Release one tab and rotate the slider pin
Figure 1-782 Remove the slider pin
Figure 1-783 Rotate the hinge arm
Figure 1-784 Remove the scanner cable cover
Figure 1-785 Release the flat cable
Figure 1-786 Remove the scanner assembly
Figure 1-787 Disconnect two cables and remove one screw
Figure 1-788 Release one tab and rotate the slider pin
Figure 1-789 Remove the slider pin
Figure 1-790 Rotate the hinge arm down
Figure 1-791 Remove the scanner cable cover
Figure 1-792 Release the flat cable
Figure 1-793 Remove the scanner assembly
Figure 1-794 Remove one screw
Figure 1-795 Rotate the hinge arm up
Figure 1-796 Remove the cover
Figure 1-797 Remove the control panel
Figure 1-798 Disconnect one connector
Figure 1-799 Disconnect one cable
Figure 1-800 Remove seven screws and the top cover
Figure 1-801 Remove the output sensor assembly
Figure 1-802 Remove the cassette tray
Figure 1-803 Open the front door
Figure 1-804 Open the rear door
Figure 1-805 Open the duplexer door
Figure 1-806 Tab locations
Figure 1-807 Remove one screw and release tabs
Figure 1-808 Remove the right cover
Figure 1-809 Tab locations
Figure 1-810 Remove one screw and release tabs
Figure 1-811 Remove the right cover
Figure 1-812 Remove the power supply switch
Figure 1-813 Remove the cassette tray
Figure 1-814 Open the front door
Figure 1-815 Open the rear door
Figure 1-816 Open the duplexer door
Figure 1-817 Tab locations
Figure 1-818 Remove one screw and release tabs
Figure 1-819 Remove the right cover
Figure 1-820 Tab locations
Figure 1-821 Remove one screw and release tabs
Figure 1-822 Remove the right cover
Figure 1-823 Release one tab
Figure 1-824 Remove the duct cover
Figure 1-825 Remove two screws
Figure 1-826 Remove three screws
Figure 1-827 Disconnect four connectors and remove the LVPS
Figure 1-828 Remove the cassette tray
Figure 1-829 Open the front door
Figure 1-830 Open the rear door
Figure 1-831 Open the duplexer door
Figure 1-832 Tab locations
Figure 1-833 Remove one screw and release tabs
Figure 1-834 Remove the right cover
Figure 1-835 Tab locations
Figure 1-836 Remove one screw and release tabs
Figure 1-837 Remove the left cover
Figure 1-838 Tab locations
Figure 1-839 Remove one screw and release tabs
Figure 1-840 Remove the right cover
Figure 1-841 Tab locations
Figure 1-842 Remove one screw and release tab
Figure 1-843 Remove the left cover
Figure 1-844 Remove the rear cover
Figure 1-845 Disconnect one flat cable
Figure 1-846 Release one tab and rotate the slider pin
Figure 1-847 Remove the slider pin
Figure 1-848 Rotate the hinge arm
Figure 1-849 Remove the scanner cable cover
Figure 1-850 Release the flat cable
Figure 1-851 Remove the scanner assembly
Figure 1-852 Disconnect two cables and remove one screw
Figure 1-853 Release one tab and rotate the slider pin
Figure 1-854 Remove the slider pin
Figure 1-855 Rotate the hinge arm down
Figure 1-856 Remove the scanner cable cover
Figure 1-857 Release the flat cable
Figure 1-858 Remove the scanner assembly
Figure 1-859 Remove one screw
Figure 1-860 Rotate the hinge arm up
Figure 1-861 Remove the cover
Figure 1-862 Remove the control panel
Figure 1-863 Disconnect one connector
Figure 1-864 Disconnect one cable
Figure 1-865 Remove seven screws and the top cover
Figure 1-866 Remove the output sensor assembly
Figure 1-867 Open the scanner
Figure 1-868 Remove one screw and the cover
Figure 1-869 Remove three screws
Figure 1-870 Rotate the control panel
Figure 1-871 Release two tabs
Figure 1-872 Release the control panel
Figure 1-873 Disconnect the flat cable
Figure 1-874 Disconnect two cables and remove one screw
Figure 1-875 Release one tab and rotate the slider pin
Figure 1-876 Remove the slider pin
Figure 1-877 Rotate the hinge arm down
Figure 1-878 Remove the scanner cable cover
Figure 1-879 Release the flat cable
Figure 1-880 Remove the scanner assembly
Figure 1-881 Disconnect two cables
Figure 1-882 Remove one screw
Figure 1-883 Remove one screw
Figure 1-884 Remove seven screws and the top cover
Figure 1-885 Disconnect one connector
Figure 1-886 Remove two screws and the guide
Figure 1-887 Remove two screws
Figure 1-888 Remove three screws and the top cover
Figure 1-889 Remove the cover
Figure 1-890 Remove two screws
Figure 1-891 Disconnect two connectors
Figure 1-892 Remove the duplex drive assembly
Figure 1-893 Release the LVPS cable
Figure 1-894 Disconnect five connectors
Figure 1-895 Release the cables
Figure 1-896 Remove four screws and the fuser
Figure 1-897 Remove the cassette tray
Figure 1-898 Open the front door
Figure 1-899 Open the rear door
Figure 1-900 Open the duplexer door
Figure 1-901 Tab locations
Figure 1-902 Remove one screw and release tabs
Figure 1-903 Remove the right cover
Figure 1-904 Tab locations
Figure 1-905 Remove one screw and release tabs
Figure 1-906 Remove the right cover
Figure 1-907 Remove the main motor
Figure 1-908 Remove the cassette tray
Figure 1-909 Open the front door
Figure 1-910 Open the rear door
Figure 1-911 Open the duplexer door
Figure 1-912 Tab locations
Figure 1-913 Remove one screw and release tabs
Figure 1-914 Remove the right cover
Figure 1-915 Tab locations
Figure 1-916 Remove one screw and release tabs
Figure 1-917 Remove the right cover
Figure 1-918 Remove the fuser motor
Figure 1-919 Remove the cassette tray
Figure 1-920 Open the front door
Figure 1-921 Open the rear door
Figure 1-922 Open the duplexer door
Figure 1-923 Tab locations
Figure 1-924 Remove one screw and release tabs
Figure 1-925 Remove the right cover
Figure 1-926 Tab locations
Figure 1-927 Remove one screw and release tabs
Figure 1-928 Remove the right cover
Figure 1-929 Release one tab
Figure 1-930 Remove the duct cover
Figure 1-931 Remove two screws
Figure 1-932 Remove three screws
Figure 1-933 Disconnect four connectors and remove the LVPS
Figure 1-934 Remove the pickup motor
Figure 1-935 Remove the cassette tray
Figure 1-936 Open the front door
Figure 1-937 Open the rear door
Figure 1-938 Open the duplexer door
Figure 1-939 Tab locations
Figure 1-940 Remove one screw and release tabs
Figure 1-941 Remove the right cover
Figure 1-942 Release one tab
Figure 1-943 Remove the duct cover
Figure 1-944 Remove two screws
Figure 1-945 Remove three screws
Figure 1-946 Disconnect four connectors and remove the LVPS
Figure 1-947 Disconnect three connectors and release the cables
Figure 1-948 Remove the cover
Figure 1-949 Release the main fan and fan guide
Figure 1-950 Remove the main fan
Figure 1-951 Remove the cassette tray
Figure 1-952 Open the front door
Figure 1-953 Open the rear door
Figure 1-954 Open the duplexer door
Figure 1-955 Tab locations
Figure 1-956 Remove one screw and release tabs
Figure 1-957 Remove the right cover
Figure 1-958 Tab locations
Figure 1-959 Remove one screw and release tab
Figure 1-960 Remove the left cover
Figure 1-961 Remove the rear cover
Figure 1-962 Disconnect one flat cable
Figure 1-963 Release one tab and rotate the slider pin
Figure 1-964 Remove the slider pin
Figure 1-965 Rotate the hinge arm
Figure 1-966 Remove the scanner cable cover
Figure 1-967 Release the flat cable
Figure 1-968 Remove the scanner assembly
Figure 1-969 Disconnect two cables and remove one screw
Figure 1-970 Release one tab and rotate the slider pin
Figure 1-971 Remove the slider pin
Figure 1-972 Rotate the hinge arm down
Figure 1-973 Remove the scanner cable cover
Figure 1-974 Release the flat cable
Figure 1-975 Remove the scanner assembly
Figure 1-976 Remove one screw
Figure 1-977 Rotate the hinge arm up
Figure 1-978 Remove the cover
Figure 1-979 Remove the control panel
Figure 1-980 Disconnect one connector
Figure 1-981 Open the scanner
Figure 1-982 Remove one screw and the cover
Figure 1-983 Remove three screws
Figure 1-984 Rotate the control panel
Figure 1-985 Release two tabs
Figure 1-986 Release the control panel
Figure 1-987 Disconnect the flat cable
Figure 1-988 Disconnect two cables and remove one screw
Figure 1-989 Release one tab and rotate the slider pin
Figure 1-990 Remove the slider pin
Figure 1-991 Rotate the hinge arm down
Figure 1-992 Remove the scanner cable cover
Figure 1-993 Release the flat cable
Figure 1-994 Remove the scanner assembly
Figure 1-995 Disconnect one cable
Figure 1-996 Remove seven screws and the top cover
Figure 1-997 Release one tab
Figure 1-998 Remove the duct cover
Figure 1-999 Remove two screws
Figure 1-1000 Remove three screws
Figure 1-1001 Disconnect four connectors and remove the LVPS
Figure 1-1002 Remove the fan duct
Figure 1-1003 Remove the cover
Figure 1-1004 Disconnect three connectors and release the cables
Figure 1-1005 Release the main fan and fan guide
Figure 1-1006 Remove the main fan
Figure 2-1 Flatbed image scanner (M180n)
Figure 2-2 Image scanner and document feeder (M180nw andM181fw)
Figure 2-3 Image scanner and document feeder (M278-M281)
Figure 2-4 Covers (M153-M154)
Figure 2-5 Covers (M178-M181)
Figure 2-6 Covers (M253-M254)
Figure 2-7 Covers (M278-M281)
Figure 2-8 Internal components (1 of 4)
Figure 2-9 Internal components (2 of 4)
Figure 2-10 Internal components (3 of 4)
Figure 2-11 Internal components (4 of 4)

____________________________

Content for TROUBLESHOOTING MANUAL:
1. THEORY OF OPERATION
Basic operation
Sequence of operation
Formatter-control system
Sleep delay
Printer job language (PJL)
Printer management language (PML)
Control panel
Easy-access USB port (touchscreen models)
Wireless (wireless models)
Low end data model (LEDM)
Advanced control language (ACL) overview
Near field communication (NFC) (wireless models)
CPU
Input/output
USB
USB hosts
10/100 networking
Fax (M181 and M281 models)
Memory
Firmware
Nonvolatile random access memory (NVRAM)
Flash memory
Random access memory (RAM)
HP Memory enhancement technology (MEt)
Engine-control system
DC controller
Motors
Fans
Solenoids
Switches
Sensors
Low-voltage power supply
Overcurrent/overvoltage protection
Low-voltage power supply unit failure detection
High-voltage power supply
Fuser control
Fuser control block diagram
Fuser heater protection
Laser scanner system
Laser failure detection
Image formation system
Image formation process
Step 1: Primary charging
Step 2: Laser-beam exposure
Step 3: Development
Step 4: Primary transfer
Step 5: Secondary transfer
Step 6: Separation
Step 7: Fusing
Step 8: Drum cleaning
Toner cartridges
Design
Memory chip
JetIntelligence
Authentication
Anti-theft
Intermediate transfer belt (ITB) assembly
Engine pickup, feed, and delivery system
Priority input slot pickup (M253-M254 and M278-M281 models)
Cassette pickup
Duplexing unit (duplex models)
Duplex reverse and duplex feed control
Duplex pickup operation
Jam detection
Scanning and image capture system (M178-M181 and M278-M281 models)
Motor and sensors
Document feeder system operation (M180nw, M181fw, and M278-M281 models)
Fax functions and operation (fax models)
Computer and network security features
PSTN operation
Receive faxes when you hear fax tones
Distinctive ring function
Set up the distinctive ring function (touchscreen control panel)
Set up the distinctive ring function (2-line control panel)
Fax by using voice over IP (VOIP) services
The fax subsystem
Fax card in the fax subsystem
Safety isolation
Safety-protection circuitry
Data path
Hook state
Downstream device detection
Hook switch control
Ring detect
Line current control
Billing or metering tone filters
Fax page storage in flash memory
Stored fax pages
Advantages of flash memory storage

2. SOLVE PROBLEMS
Solve problems checklist
Print the menu map
Print a configuration report
Print the service page (includes the event log)
Troubleshooting process
Determine the problem source
Troubleshooting flowchart
Power subsystem
Power-on checks
Power-on troubleshooting overview
Control panel checks
Tools for troubleshooting
Individual component diagnostics
Tools for troubleshooting: LED diagnostics
Network port LEDs
Two-line control panel LEDs
Tools for troubleshooting: Engine diagnostics
Engine test
Diagrams
Diagrams: Block diagrams
Sensors and switches
Diagrams: Printed circuit assembly (PCA) connector locations
Diagrams: Formatter connections
Diagrams: DC controller connections
Diagrams: External plug and port locations
M153-M154 external plug and port locations
M178-M181 external plug and port locations
M253-M254 external plug and port locations
M278-M281 external plug and port locations
Diagrams: Locations of major components
Major components (printer base)
Motors and fan
Rollers (printer base)
PCAs (printer base)
Diagrams: Timing chart
Diagrams: Circuit diagrams
Advanced configuration with HP Embedded Web Server (EWS) and HP Device Toolbox (Windows)
Internal test and information pages
Print the configuration report
Print the configuration report from a 2-line control panel
Print the configuration report from a touchscreen control panel
Print a configuration report from the M153-M154 LED control panel
Print a configuration report from the M178-M181 LED control panel
Finding important information on the configuration report
Control panel menus
Control-panel view (M153-M154 model)
LED control-panel view (M180n model)
2-line LCD control-panel view (M180nw and M181fw models)
2-line control-panel view (M254nw and M254dn models)
Touchscreen control-panel view (M254dw model)
Home screen layout
Touchscreen control-panel view (M278-M281 models)
Home screen layout
Setup menu
HP Web Services menu
Reports menu
Self Diagnostics menu
Fax Setup menu
System Setup menu
Service menu
Network Setup menu
Quick Forms menu
Function specific menus
USB menu
Fax Menu (M181 and M281 models only)
Copy menu (M178-M181 and M278-M281 models only)
Scan menu (M178-M181 and M278-M281 models only)
Apps
Control panel message document (CPMD)
Control panel messages and event log entries
Improve print quality
Introduction
Update the printer firmware
Print from a different software program
Check the paper-type setting for the print job
Check the paper type setting on the printer
Check the paper type setting (Windows)
Check the paper type setting (OS X)
Check toner-cartridge status
Print a cleaning page
Visually inspect the toner cartridge or cartridges
Check paper and the printing environment
Step one: Use paper that meets HP specifications
Step two: Check the environment
Step three: Set the individual tray alignment
Try a different print driver
Check the EconoMode settings
Adjust Print Density
Calibrate the printer to align the colors
Adjust color settings (Windows)
Print and interpret the print quality page
Print quality troubleshooting guide
Resolving print quality problems
Introduction
Troubleshoot print quality problems
Printer-specific image defects
Repetitive image defects
Use a ruler to measure between repetitive defects
Printer-specific print quality troubleshooting guide
Light print (1 of 2)
Light print (2 of 2)
Dark print
Blank page
All black or solid color page
White spots
Dirt on the back of the page
Vertical lines
Vertical white lines (one color)
Vertical white lines (all colors)
Horizontal lines
Horizontal white lines
Missing color
Dropouts
Loose toner
Color misregistration
Toner smear
Malformed or misplaced image
Wrinkles or creases
Page skew
Dirt on front of page
Vertical density variation
Repetitive image defects
Clean the printer
Print a cleaning page
Clean the scanner glass strip and platen
Clean the pickup and separation rollers
Clean the pickup rollers and separation pad in the document feeder
Clean the touchscreen
Solve paper-handling problems
Printer feeds incorrect page size
Printer pulls from incorrect tray
Printer will not duplex or duplexes incorrectly
Paper does not feed from the cassette tray
Output is curled or wrinkled
Printer does not pick up paper or misfeeds
The printer does not pick up paper
The printer picks up multiple sheets of paper
The document feeder jams, skews, or picks up multiple sheets of paper (M181 and M278-M281 models)
Paper does not feed automatically
Prevent paper jams
Clear paper jams
Introduction
Experiencing frequent or recurring paper jams?
M153-M154 models
M178-M181 models
M253-M254 models
M278-M281 models
Paper jam locations
Clear paper jams in the document feeder (M180nw and M181fw models only)
Clear paper jams in the document feeder (M278-M281 models only)
Clear paper jams in the priority feed slot (M253-M254 and M278-M281 models only)
Clear paper jams in the cassette tray (M153-M154 and M178-M181 models only)
Clear paper jams in the cassette tray (M253-M254 and M278-M281 models only)
Clear paper jams in the rear door and the fuser area (simplex models)
Clear paper jams in the duplexer (M253-M254)
Clear paper jams in the duplexer (M278-M281)
Clear paper jams in the output bin (M153-M154)
Clear paper jams in the output bin (M178-M181)
Clear paper jams in the output bin (M253-M254)
Clear paper jams in the output bin (M278-M281)
Solve performance problems
Solve connectivity problems
Solve USB connection problems
Solve wired network problems
Introduction
Poor physical connection
The computer is using the incorrect IP address for the printer
The computer is unable to communicate with the printer
The printer is using incorrect link and duplex settings for the network
New software programs might be causing compatibility problems
The computer or workstation might be set up incorrectly
The printer is disabled, or other network settings are incorrect
Solve wireless network problems
Introduction
Wireless connectivity checklist
The printer does not print after the wireless configuration completes
The printer does not print, and the computer has a third-party firewall installed
The wireless connection does not work after moving the wireless router or printer
Cannot connect more computers to the wireless printer
The wireless printer loses communication when connected to a VPN
The network does not appear in the wireless networks list
The wireless network is not functioning
Perform a wireless network diagnostic test
Reduce interference on a wireless network
Service mode functions
Service menu
Secondary service menu
Printer resets
Restore the factory-set defaults
NVRAM initialization
Super NVRAM initialization
Solve fax problems (fax models only)
Checklist for solving fax problems
Perform a fax diagnostic test
Solve general fax problems
Faxes are sending slowly
Print quality of a photo is poor or prints as a gray box
Fax quality is poor
Selected Cancel to cancel a fax, but the fax was still sent
No fax address book displays
Not able to locate the fax settings in HP Web Jetadmin
The header is appended to the top of the page when the overlay option is enabled
A mix of names and numbers is in the recipients box
A one-page fax prints as two pages
A document stops in the document feeder in the middle of faxing
The volume for sounds coming from the fax accessory is too high or too low
Use fax over VoIP networks
Solve problems receiving faxes
Solve problems sending faxes
Fax error messages on the control panel
The No Fax Detected message displays
The Communication error message appears
No Dial Tone
The Fax is busy message appears
The No fax answer message appears
Document feeder paper jam
The Fax storage is full message appears
Scanner error
The control panel displays a Ready message with no attempt to send the fax
The control panel displays the message “Storing page 1” and does not progress
beyond that message
Faxes can be received, but not sent
Printer is password protected
Unable to use fax functions from the control panel
Unable to use speed dials
Unable to use group dials
Receive a recorded error message from the phone company when trying to send a fax
Unable to send a fax when a phone is connected to the printer
Troubleshoot fax codes and trace reports
View and interpret fax error codes
Fax trace report
Fax logs and reports
Print all fax reports
Print individual fax reports
Set the fax error report
Set the fax-error-correction mode
Change the fax speed
Use fax on a DSL, PBX, or ISDN system
DSL
PBX
ISDN
Solve email problems
Cannot connect to the email server
Validate the SMTP gateway (Windows)
Validate the LDAP gateway (Windows)
Firmware upgrades
Method one: Update the firmware using the control panel
Method two: Update the firmware using the Firmware Update Utility

Appendix A Certificates of volatility
Certificate of volatility (M153-M154)
Certificate of volatility (M178-M181)
Certificate of volatility (M253-M254)
Certificate of volatility (M278-M281)
INDEX

List of tables
Table 1-1 Sequence of operation
Table 1-2 Printer motors
Table 1-3 Printer fan
Table 1-4 Solenoids
Table 1-5 Switches
Table 1-6 Sensors
Table 1-11 Motor and sensors
Table 2-1 Troubleshooting flowchart
Table 2-2 Switches and sensors for the pickup, feed and delivery system
Table 2-3 Formatter connections (M153-M154 and M253-M254 models)
Table 2-4 Formatter connections (M178-181 and M278-281 models)
Table 2-5 DC controller connectors
Table 2-6 Major components (printer base)
Table 2-7 Rollers (printer base)
Table 2-8 Main PCAs (printer base)
Table 2-9 M154 sample configuration report
Table 2-10 M181 sample configuration report (first page)
Table 2-11 M181 sample configuration report (second page)
Table 2-12 HP Web Services menu
Table 2-13 Reports menu
Table 2-14 Self Diagnostics menu
Table 2-15 Fax Setup menu
Table 2-16 System Setup menu
Table 2-17 Service menu
Table 2-18 Network Setup menu
Table 2-19 Quick Forms menu
Table 2-20 USB menu
Table 2-21 Fax Menu
Table 2-22 Copy menu
Table 2-23 Scan menu
Table 2-24 Image defects table quick reference
Table 2-25 Light print
Table 2-26 Gray background or dark print
Table 2-27 Blank page – No print
Table 2-28 Black page
Table 2-29 Banding defects
Table 2-30 Streak defects
Table 2-31 Fixing/fuser defects
Table 2-32 Image placement defects
Table 2-33 Color plane registrations defects (color models only)
Table 2-34 Output defects
Table 2-36 Solve performance problems
Table 2-37 Service menu
Table 2-38 Secondary service menu
Table 2-39 Solve problems receiving faxes
Table 2-40 Solve problems sending faxes

List of figures
Figure 1-4 High-voltage power supply
Figure 1-6 Fuser control
Figure 1-9 Primary charging
Figure 1-10 Laser-beam exposure
Figure 1-11 Development
Figure 1-12 Primary transfer
Figure 1-13 Secondary transfer
Figure 1-14 Separation
Figure 1-15 Fusing
Figure 1-16 Drum cleaning
Figure 1-17 Toner cartridge system
Figure 1-18 ITB assembly
Figure 1-25 Motor and sensors
Figure 2-1 Engine test page
Figure 2-2 Engine test page
Figure 2-3 Engine test page
Figure 2-4 Engine test page
Figure 2-5 Sensors and switches
Figure 2-6 Formatter connections (M153-M154 and M253-M254 models)
Figure 2-7 Formatter connections (M178-181 and M278-281 models)
Figure 2-8 DC controller PCA connectors
Figure 2-9 Major components (printer base)
Figure 2-10 Motors and fan
Figure 2-11 Rollers (printer base)
Figure 2-12 Main PCAs (printer base)
Figure 2-13 General timing chart
Figure 2-14 General circuit diagram (printer base)
Figure 2-15 M154 sample configuration report
Figure 2-16 M181 sample configuration report (first page)
Figure 2-17 M181 sample configuration report (second page)
Figure 2-18 Print quality page
Figure 2-19 Examples of repetitive defects
Figure 2-20 Place the ruler on the page
Figure 2-21 Locate the next repetitive defect
Figure 2-22 Determine the defective assembly
Figure 2-46 Paper jam locations (M153-M154)
Figure 2-47 Paper jam locations (M178-M181)
Figure 2-48 Paper jam locations (M253-M254)
Figure 2-49 Paper jam locations (M278-M281)
Figure A-1 Certificate of volatility M153-M154 (1 of 2)
Figure A-2 Certificate of volatility M153-M154 (2 of 2)
Figure A-3 Certificate of volatility M178-M181 (1 of 2)
Figure A-4 Certificate of volatility M178-M181 (2 of 2)
Figure A-5 Certificate of volatility M253-M254 (1 of 2)
Figure A-6 Certificate of volatility M253-M254 (2 of 2)
Figure A-7 Certificate of volatility M278-M281 (1 of 2)
Figure A-8 Certificate of volatility M278-M281 (2 of 2)

HP CLJ Color LaserJet Pro M153 M154 M253 M254 MFP M178 M181 M278 M281