HP LaserJet 4345mfp Series Service Manual - ENWW

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3 Unlock the tab on the right-reverse-assembly-drive cover, and remove the cover.Figure 6-53 Remove the reversing assembly (2 of 8)CAUTION The spring that is under the right-reversing-assembly lever is not captive. Donot lose the spring that is under the lever when you remove the cover. Make sure you seatthe spring correctly on the chassis pedestal when you reinstall the cover.184 6 Removal and replacement
4 Unlock the two tabs (callout 2) on the left-reverse-assembly-drive cover, and remove the cover.Figure 6-54 Remove the reversing assembly (3 of 8)NOTE When reinstalling the cover, make sure that the metal tab on the sheet-metalchassis (near the rear door-piston) is in the slot in the cover (callout 3).Figure 6-55 Remove the reversing assembly (4 of 8)Internal assemblies 185
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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
Page 164 and 165: Staple modeWhen the print job speci
Page 166 and 167: Figure 5-36 Stapler unit operation1
Page 168 and 169: Figure 5-38 Scanner assembly electr
Page 170 and 171: Figure 5-40 Scan carriage movement1
Page 172 and 173: ADF pickup jamIf the leading edge o
Page 174 and 175: Removal and replacement strategyThi
Page 176 and 177: Screws that are used in the MFPThe
Page 178 and 179: Print cartridge1 Open the top cover
Page 180 and 181: Transfer roller1 Remove the print c
Page 182 and 183: 3 Remove the ADF input tray.Figure
Page 184 and 185: ADF separation pad1 Open the ADF to
Page 186 and 187: 3 If necessary, pull the ADF delive
Page 188 and 189: Duplex-printing unit1 Slide the dup
Page 190 and 191: FuserCAUTION The fuser is very hot.
Page 192 and 193: Tray 1 pickup roller1 Open tray 1.N
Page 194 and 195: ADF-hinge flap1 Use a small, flat-b
Page 196 and 197: 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 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 248 and 249: 4 Disconnect the fan connector (J78
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
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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
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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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