HP LaserJet 4345mfp Series Service Manual - ENWW

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4 Disconnect the fan connector (J78, callout 3) from the dc controller.Figure 6-114 Remove the print-cartridge fan (3 of 4)5 Use a small, flat-blade screwdriver to release the locking tabs that are on each side of the fan(callout 4). Insert a second flat-blade screwdriver behind the fan, and push the fan out.Figure 6-115 Remove the print-cartridge fan (4 of 4)218 6 Removal and replacement
Print-cartridge motor (M102)1 Remove the back cover. See Back cover.2 Remove the print-cartridge fan. See Print-cartridge fan (FN102).3 Remove two screws (callout 1), and remove the fan shroud.Figure 6-116 Remove the print-cartridge motor (1 of 4)4 Remove seven screws (callout 2), and then rotate the rear sheet-metal shield away from the MFP.Figure 6-117 Remove the print-cartridge motor (2 of 4)Internal assemblies 219
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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
Page 198 and 199: Hard driveWARNING! The MFP contains
Page 200 and 201: DIMMsWARNING! The MFP contains comp
Page 202 and 203: Fax accessoryWARNING! The MFP conta
Page 204 and 205: Top-cover flatbed flange1 Grasp one
Page 206 and 207: 3 Open the top cover, and remove on
Page 208 and 209: 7 Flex the bottom of the cover away
Page 210 and 211: 4 Release three locking tabs along
Page 212 and 213: Reversing-separation-guide assembly
Page 214 and 215: 3 Unlock the tab on the right-rever
Page 216 and 217: 5 Push up on the swing-arm-locking
Page 218 and 219: Main fan (FN101) and reversing-unit
Page 220 and 221: 6 Disconnect one connector (callout
Page 222 and 223: 10 Release the three locking tabs o
Page 224 and 225: 4 Disconnect two locking tabs (one
Page 226 and 227: 4 Disconnect the jam-access-cover-s
Page 228 and 229: 3 Unclip the sensor-flag holder fro
Page 230 and 231: Front-cover support1 Remove the tra
Page 232 and 233: 3 Remove the shaft from the jam-acc
Page 234 and 235: 7 Remove six screws (callout 2) fro
Page 236 and 237: 11 Remove seven screws (callout 5),
Page 238 and 239: Feed-roller assembly1 Remove the tr
Page 240 and 241: 6 Reinstallation tip: When the feed
Page 244 and 245: Main motor (M101)1 Remove the dc co
Page 246 and 247: 4 Unwind the connector wire from th
Page 252 and 253: 3 Use a small, flat-blade screwdriv
Page 254 and 255: 3 Unhook the lifter-drive-assembly
Page 256 and 257: 7 Remove five screws (callout 5), a
Page 260 and 261: 8 CAUTION: Do not let the pickup ro
Page 264 and 265: Power-factor-correction (PFC) power
Page 266 and 267: 5 Remove one screw (callout 4), pus
Page 268 and 269: 9 Disconnect three connectors (call
Page 270 and 271: 3 Remove seven screws (callout 2),
Page 272 and 273: 7 Remove two screws (callout 10), r
Page 274 and 275: 11 Reach inside the MFP, lift up on
Page 276 and 277: 3 Release the paper-feed-assembly a
Page 278 and 279: Paper-size-detection switch (SW102)
Page 280 and 281: Laser/scanner1 Remove the following
Page 282 and 283: Output-bin-full sensor1 Remove the
Page 284 and 285: ADF and scanner componentsThe proce
Page 286 and 287: Scanner assembly1 Remove the ADF as
Page 288 and 289: 5 Close the top cover. Remove two s
Page 290 and 291: 8 Slide the scanner slightly to the
Page 292 and 293: 4 Remove three screws (callout 2).F
Page 294 and 295: Optical unit1 Remove the following
Page 296 and 297: 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
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5 Rotate the paper-release guide to
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4 Insert the optional envelope feed
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5 Rotate the paper-release guide to
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5 Slide the tray into the MFP.6 If
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5 Reinstall the duplexer.6 Reinstal
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5 If you are using a 3-bin mailbox,
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6 If you can see either the leading
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14 Reinstall the duplexer or the du
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Clearing staple jamsOccasionally, s
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Solving repeated jamsSituationSolut
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Jams in the envelope-feeder area an
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Table 7-8 Causes of jams in the out
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Using the paper-path testThe paper-
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Overhead transparency defectsOverhe
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Table 7-11 Defects that can occur d
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Light print (entire page)Begin by p
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DropoutsTable 7-16 DropoutsPossible
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LinesAaBbCcAaBbCcAaBbCcAaBbCcAaBbCc
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Gray backgroundPossible cause1 The
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Repeating defects and repeating ima
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Page skewPossible cause1 The media
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Wrinkles or creasesPossible cause1
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Horizontal white linesPossible caus
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White spots on blackPossible cause1
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Blurred printPossible cause1 The me
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Blank page (ADF)First, verify that
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Vertical lines (ADF)Possible causeS
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Repetitive defect rulerDefects on r
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Media-transport problemsThe followi
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E-mail problemsIf you are unable to
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To perform the loopback test1 Disco
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Half self-testUse the half self-tes
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After performing an NVRAM initializ
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Information tabThe Information page
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the embedded Web server, you must c
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Opening the HP ToolboxTo view the H
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■Product Support. Connects to the
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Configuration pagesDepending on the
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HP Jetdirect pageThe second configu
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Table 7-20 Important information on
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Usage pageThe usage page provides i
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Diagnostics menuThe following table
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Item Options Values ExplanationSCAN
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Manual sensor testThe manual sensor
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Service menuAuthorized HP service t
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Service IDThis information appears
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Diagrams for troubleshootingUse the
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Scanner-controller PCA connectionsF
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ComponentReversing intermediate PCA
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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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HP LaserJet 4345mfp Series Service Manual - ENWW

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