HP LaserJet 4345mfp Series Service Manual - ENWW

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Blank page (ADF)First, verify that the scanner is scanning from the ADF and not the scanner glass. If it is scanningfrom the glass, you should be able to see the scanner lamp and optical head move the entire lengthof the glass. If no document is on the glass, a blank page is produced.If the scanner is scanning from the ADF and blank pages are produced, continue with the followingtroubleshooting steps.Possible cause1 The source document was not placed in the ADFinput tray face-up.2 The source document was not detected in the ADFinput tray.3 A source document was not picked up whenattempting to feed multiple documents.SolutionVerify that the source document is face-up in theADF input tray.Remove and then reinsert the original page into theADF, making sure that it is placed face-up.Inspect the ADF pickup and feed rollers and the ADFSeparation pad for damage. See ADF pickup andfeed rollers and see ADF separation pad. Clean therollers if they are dirty. See Cleaning the ADF deliverysystem. If the ADF separation pad or rollers are worn,replace them. See Performing preventive maintenance.388 7 Troubleshooting
Page skew (ADF)Possible causeSolution1 The scanner needs to be calibrated. Calibrate the scanner. See Calibrating the scanner.2 The ADF input tray guides are not adjusted correctly. Make sure the ADF input tray guides are adjusted sothat they are lightly touching the sides of the paperstack.3 The ADF mylar strip is dirty Replacement mylar strips are stored in an envelopethat is underneath the white, vinyl ADF backing.Follow the instructions that are in the envelope.Image-formation troubleshooting 389
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HP LaserJet 4345mfp SeriesService M
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Table of contents1 Product informat
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Fax connection.....................
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HP Memory Enhancement technology...
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Required tools.....................
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Accessory lights for the 3-bin mail
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To print an information page.......
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Scanner covers.....................
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List of tablesTable 1-1 Parts compa
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Table 8-48 Scanner-belt assembly...
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Figure 5-41 ADF paper path and sens
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Figure 6-100 Remove the feed-roller
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Figure 6-200 Remove the scanner-con
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Figure 8-37 ADF pickup-roller assem
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HP LaserJet 4345mfp configurationsT
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Features and benefits of the MFPThe
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Paper-handling■Input■■■■
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MFP parts and accessoriesBefore usi
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Interface portsThe MFP has five por
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Parts compatibility with other HP L
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Moving the MFPBefore moving the MFP
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Environmental specificationsTable 1
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Acoustic specificationsTable 1-7 So
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45% to 55%. The following guideline
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LabelsCAUTION To avoid damaging the
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Table 1-9 Tray 1 supported sizes an
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Table 1-13 Optional 3-bin mailbox o
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Regulatory informationFCC and Telec
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Since 1992, HP has offered HP Laser
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Country-/region-specific safety sta
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Declaration of conformity (HP Laser
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36 1 Product information
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Service approachMFP repair normally
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Hewlett-Packard Limited Warranty St
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Availability of support and service
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Installation checklistWhen setting
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Connecting to a computer or network
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troubleshooting problems with the f
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Security featuresSeveral important
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Data affectedData affected (covered
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54 3 Installation and configuration
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Cleaning the MFPTo maintain print q
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Cleaning the ADF delivery systemCle
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4 Close the scanner lid.5 Pull the
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Calibrating the scannerCalibrate th
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The ADF maintenance kitAfter feedin
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Checking the supply levelYou can ch
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Setting the real-time clockUse the
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9 The settings are saved and the co
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3 Click the column header of your c
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To upgrade the firmware on a networ
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Upgrading the HP Jetdirect firmware
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Basic operationAll high-level MFP p
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Formatter systemThe formatter is re
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Flash memoryTwo flash memory slots
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Engine-control systemThe control sy
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Motors and fansThe MFP print engine
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Fuser controlThe fuser-control circ
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Figure 5-4 Fuser circuit90 5 Theory
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electrostatic image on the primary
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Overcurrent/overvoltage protectionI
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photosensitive drum. The modulated
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Image-formation systemThe image-for
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Writing timing■■When printing i
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Pickup, feed, and delivery systemTh
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Figure 5-13 Sensor and switch locat
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Printing from tray 1The tray 1 pape
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Media-size detectionThe MFP has thr
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Lifter-driver operationThe lifter d
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Media-skew preventionThe MFP uses a
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Feed-speed controlTo ensure that th
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Figure 5-24 Face-down delivery: med
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Jam detectionThe MFP uses the follo
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Reversing stationary jam (face-down
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Printing from the 500-sheet feederT
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Figure 5-29 500-sheet feeder pickup
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Figure 5-31 Duplex printing control
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3-bin mailbox feed and delivery sys
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Stacker modeWhen configured for sta
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Stapler/stacker feed and delivery s
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Staple modeWhen the print job speci
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Figure 5-36 Stapler unit operation1
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Figure 5-38 Scanner assembly electr
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Figure 5-40 Scan carriage movement1
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ADF pickup jamIf the leading edge o
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Removal and replacement strategyThi
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Screws that are used in the MFPThe
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Print cartridge1 Open the top cover
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Transfer roller1 Remove the print c
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3 Remove the ADF input tray.Figure
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ADF separation pad1 Open the ADF to
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3 If necessary, pull the ADF delive
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Duplex-printing unit1 Slide the dup
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FuserCAUTION The fuser is very hot.
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Tray 1 pickup roller1 Open tray 1.N
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ADF-hinge flap1 Use a small, flat-b
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Formatter cover and formatter1 Slid
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Hard driveWARNING! The MFP contains
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DIMMsWARNING! The MFP contains comp
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Fax accessoryWARNING! The MFP conta
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Top-cover flatbed flange1 Grasp one
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3 Open the top cover, and remove on
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7 Flex the bottom of the cover away
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4 Release three locking tabs along
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Reversing-separation-guide assembly
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3 Unlock the tab on the right-rever
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5 Push up on the swing-arm-locking
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Main fan (FN101) and reversing-unit
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6 Disconnect one connector (callout
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10 Release the three locking tabs o
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4 Disconnect two locking tabs (one
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4 Disconnect the jam-access-cover-s
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3 Unclip the sensor-flag holder fro
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Front-cover support1 Remove the tra
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3 Remove the shaft from the jam-acc
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7 Remove six screws (callout 2) fro
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11 Remove seven screws (callout 5),
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Feed-roller assembly1 Remove the tr
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6 Reinstallation tip: When the feed
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Main motor (M101)1 Remove the dc co
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4 Unwind the connector wire from th
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4 Disconnect the fan connector (J78
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3 Use a small, flat-blade screwdriv
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3 Unhook the lifter-drive-assembly
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7 Remove five screws (callout 5), a
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8 CAUTION: Do not let the pickup ro
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Power-factor-correction (PFC) power
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5 Remove one screw (callout 4), pus
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9 Disconnect three connectors (call
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3 Remove seven screws (callout 2),
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7 Remove two screws (callout 10), r
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11 Reach inside the MFP, lift up on
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3 Release the paper-feed-assembly a
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Paper-size-detection switch (SW102)
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Laser/scanner1 Remove the following
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Output-bin-full sensor1 Remove the
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ADF and scanner componentsThe proce
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Scanner assembly1 Remove the ADF as
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5 Close the top cover. Remove two s
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8 Slide the scanner slightly to the
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4 Remove three screws (callout 2).F
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Optical unit1 Remove the following
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5 Flex the side of the scanner chas
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8 When the FCC cable-guide is reins
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Inverter PCA1 Remove the following
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Scanner home-position sensor1 Remov
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Scanner-controller PCA1 Remove two
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ADF output-bin extension1 Open the
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ADF white mylar-backing1 Open the A
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ADF front cover1 Remove the ADF inp
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ADF left-side cover1 Remove the fol
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ADF jam-access cover and latch1 Rem
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ADF leading-edge and paper-present
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3 Remove two screws (callout 2) fro
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500-sheet-feeder rear cover1 Remove
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500-sheet-feeder front cover1 Remov
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500-sheet-feeder upper-left coverRe
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500-sheet-feeder number-plate assem
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500-sheet-feeder PCA1 Remove the 50
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500-sheet-feeder paper-size switch1
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500-sheet-feeder jam-access-cover-o
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Troubleshooting processWhen the MFP
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Troubleshooting flowchartThis flowc
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Power-on checksThe basic MFP functi
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Control-panel messagesMessages appe
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Table 7-2 Control-panel messages (c
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Accessory lights for the 3-bin mail
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Heartbeat LEDThe heartbeat LED indi
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Table 7-3 Control-panel messages fo
Page 368 and 369: 5 Rotate the paper-release guide to
Page 370 and 371: 4 Insert the optional envelope feed
Page 372 and 373: 5 Rotate the paper-release guide to
Page 374 and 375: 5 Slide the tray into the MFP.6 If
Page 376 and 377: 5 Reinstall the duplexer.6 Reinstal
Page 378 and 379: 5 If you are using a 3-bin mailbox,
Page 380 and 381: 6 If you can see either the leading
Page 382 and 383: 14 Reinstall the duplexer or the du
Page 384 and 385: Clearing staple jamsOccasionally, s
Page 386 and 387: Solving repeated jamsSituationSolut
Page 388 and 389: Jams in the envelope-feeder area an
Page 390 and 391: Table 7-8 Causes of jams in the out
Page 392 and 393: Using the paper-path testThe paper-
Page 394 and 395: Overhead transparency defectsOverhe
Page 396 and 397: Table 7-11 Defects that can occur d
Page 398 and 399: Light print (entire page)Begin by p
Page 400 and 401: DropoutsTable 7-16 DropoutsPossible
Page 402 and 403: LinesAaBbCcAaBbCcAaBbCcAaBbCcAaBbCc
Page 404 and 405: Gray backgroundPossible cause1 The
Page 406 and 407: Repeating defects and repeating ima
Page 408 and 409: Page skewPossible cause1 The media
Page 410 and 411: Wrinkles or creasesPossible cause1
Page 412 and 413: Horizontal white linesPossible caus
Page 414 and 415: White spots on blackPossible cause1
Page 416 and 417: Blurred printPossible cause1 The me
Page 420 and 421: Vertical lines (ADF)Possible causeS
Page 422 and 423: Repetitive defect rulerDefects on r
Page 424 and 425: Media-transport problemsThe followi
Page 426 and 427: E-mail problemsIf you are unable to
Page 428 and 429: To perform the loopback test1 Disco
Page 430 and 431: Half self-testUse the half self-tes
Page 432 and 433: After performing an NVRAM initializ
Page 434 and 435: Information tabThe Information page
Page 436 and 437: the embedded Web server, you must c
Page 438 and 439: Opening the HP ToolboxTo view the H
Page 440 and 441: ■Product Support. Connects to the
Page 442 and 443: Configuration pagesDepending on the
Page 444 and 445: HP Jetdirect pageThe second configu
Page 446 and 447: Table 7-20 Important information on
Page 448 and 449: Usage pageThe usage page provides i
Page 450 and 451: Diagnostics menuThe following table
Page 452 and 453: Item Options Values ExplanationSCAN
Page 454 and 455: Manual sensor testThe manual sensor
Page 456 and 457: Service menuAuthorized HP service t
Page 458 and 459: Service IDThis information appears
Page 460 and 461: Diagrams for troubleshootingUse the
Page 462 and 463: Scanner-controller PCA connectionsF
Page 464 and 465: ComponentReversing intermediate PCA
Page 466 and 467: Sensors in the print-cartridge area
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Sensors in the interior of the MFPF
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Top-cover switch, SW101Figure 7-10
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Rear-side fansFigure 7-13 Rear-side
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Rear-side motors (2 of 2)Figure 7-1
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Right, rear corner components (1 of
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Scanner and ADF componentsThe photo
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ADF motors, solenoid, and sensorsFi
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Figure 7-24 General timing chart (2
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Figure 7-26 General circuit diagram
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Figure 7-28 Circuit diagram for the
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How to order parts, supplies, and a
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Customer-replaceable parts and acce
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Customer-replaceable components (pr
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Customer-replaceable components (AD
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Cables and interfacesFigure 8-4 Cab
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Control panel and control-panel ove
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MemoryFigure 8-6 Memory470 8 Parts
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Print cartridge and maintenance kit
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Documentation, software, and traini
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Assembly locationsFigure 8-9 Print-
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Figure 8-10 Print-engine assemblies
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External componentsFigure 8-11 Exte
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Print-engine internal componentsUpp
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Internal components (1 of 5)Figure
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Electrical/forward assemblyFigure 8
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Main drive assemblyFigure 8-19 Main
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Paper-pickup-drive assemblyFigure 8
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Lifter-drive assemblyFigure 8-21 Li
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CassetteFigure 8-22 Cassette502 8 P
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Paper-feed roller assemblyFigure 8-
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Registration assemblyFigure 8-24 Re
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Multipurpose assemblyFigure 8-25 Mu
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Reverse assemblyFigure 8-26 Reverse
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Reverse-separation-guide assemblyFi
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Delivery assemblyFigure 8-28 Delive
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FuserFigure 8-29 Fuser516 8 Parts a
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ADF componentsADF assemblyFigure 8-
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ADF internal components (1 of 3)Fig
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ADF internal components (2 of 3)12F
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ADF internal components (3 of 3)Fig
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ADF input trayFigure 8-34 ADF input
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ADF separation padFigure 8-35 ADF s
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ADF separation-pad caseFigure 8-36
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ADF pickup-roller assemblyFigure 8-
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ADF pickup-roller coverFigure 8-38
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ADF mylar-holder assemblyFigure 8-3
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ADF mylar replacement kitFigure 8-4
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Scanner componentsScanner glass and
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Scanner-base componentsFigure 8-42
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Scanner flatbed-unit assemblyFigure
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Scanner coversFigure 8-44 Scanner c
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Scanner-carriage-lock assemblyFigur
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Scanner-open-sensor assemblyFigure
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Scanner-motor fanFigure 8-47 Scanne
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Scanner motorFigure 8-48 Scanner mo
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Scanner-belt assemblyFigure 8-49 Sc
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Scanner slide-railFigure 8-50 Scann
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Scanner optical assemblyFigure 8-51
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500-sheet feeder componentsAssembly
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External componentsFigure 8-53 500-
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500-sheet feeder main body (1 of 2)
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500-sheet feeder main body (2 of 2)
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500-sheet feeder lifter-drive assem
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500-sheet feeder cassetteFigure 8-5
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Optional devicesDuplex-printing acc
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Stapler/stackerFigure 8-59 Stapler/
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3-bin mailboxFigure 8-60 3-bin mail
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Alphabetical parts listTable 8-59 A
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Table 8-59 Alphabetical parts list
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Table 8-60 Numerical parts list (co
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606 8 Parts and diagrams
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sensors, diagrams 448sensors, remov
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electrical specifications 17embedde
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embedded Web server settings405erro
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everse-separation-guideassembly 512
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power specifications 17wake time 69
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firmware updates 75IP address, chan
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