HP M551n Service Manual Download - Page 1

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7Table of Contents

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37Theory of operation

38Basic operation

39Sequence of operation

40Engine control system

41DC controller

46High voltage power supply

48Low voltage power supply

50Overcurrent/overvoltage protection

51Power off condition

52Fuser temperature control circuit

53Fuser over temperature protection

54Fuser failure detection

55Laser/scanner system

57Image formation system

58Image formation process

59Step 1: Pre-exposure

60Step 3: Laser-beam exposure

61Step 5: Primary transfer

62Step 7: Separation

63Step 9: ITB cleaning

65Developing roller engagement and disengagement

67Intermediate transfer belt (ITB) unit

68Primary-transfer-roller engagement and disengagement

73Image stabilization control

74Pickup, feed, and delivery system

78Pickup-and-feed unit

79Cassette pickup

80Cassette presence detection

81Cassette lift operation

82Cassette paper presence detection

83Cassette media width detection

84Multifeed prevention

85Multipurpose tray pickup

87Skew-feed prevention

88OHT detection

90Pressure-roller pressurization control

91Duplexing unit (duplex models)

92Duplexing reverse and feed control

93Jam detection

95Optional paper feeder

97Paper-feeder pickup and feed operation

98Paper size detection and cassette presence detection

100Paper feeder cassette lift operation

102Paper feeder presence detection

103Paper-feeder multiple feed prevention

104Paper feeder jam detection

105Removal and replacement

106Introduction

107Electrostatic discharge

108Required tools

109Service approach

110Parts removal order

112Customer self repair (CSR) components

114Duplex reverse guide

115Toner collection unit

117Formatter PCA

120Remove the SSM

121Install a replacement hard drive

122Tray cassette

124Pickup roller (Tray 1)

125Pickup roller (Tray 2)

127Pickup and feed rollers (Tray 3)

129Separation roller (Tray 2)

130Secondary transfer roller

131Reinstall the transfer roller

132Secondary transfer assembly

133Reinstall the secondary transfer assembly

134Intermediate transfer belt (ITB)

136Right door (optional paper feeder)

139Front door assembly

141Right door assembly

145Right rear cover

149Left bottom cover

150Left bottom handle

151Hardware integration pocket (HIP) (dn and xh models only)

152Control panel assembly

154Right front cover

157Reinstall the power button

158Front top cover

160Rear cover and upper rear cover

163Rear top cover

165Right bottom handle

166Rear bottom handle

167Internal assemblies

172Toner collection sensor

174Residual toner feed motor

178Reinstall the residual toner collection door

179Registration density (RD) sensor assembly

183Power supply fan and fan duct

186Registration assembly

191Lower pickup guide

193Reinstall the lower pickup guide

194Interconnect board (ICB)

196DC controller PCA and tray

199Low voltage power supply

203High voltage power supply lower (HVPS-D)

205Reinstall the high voltage power supply lower

206Developing disengagement motor

208Pickup motor

209Lifter drive assembly

211Automatic close assembly

212Cassette pickup drive assembly

217Reinstall the cassette pickup drive assembly

219Cassette pickup assembly

220Remove the cassette pickup assembly

222Laser/scanner assembly (Y/M)

229Laser/scanner assembly (C/Bk)

230Remove the laser/scanner assembly (C/Bk)

234Reinstall the protective glass cleaner (PGC) actuators

237High voltage power supply upper (HVPS-T)

238Remove the high voltage power supply upper

241Reinstall the high voltage power supply upper

242Drum motor 1

243Remove the drum motor 1

244Drum motor 2 or drum motor 3

245Remove the drum motor 2 or drum motor 3

247Remove the fuser motor

248Main drive assembly

249Remove the main drive assembly

253Reinstall the main drive assembly

259Fuser drive assembly

260Remove the fuser drive assembly

263Reinstall the fuser drive assembly

264Delivery assembly

265Remove the delivery assembly

268Reinstall the delivery assembly

269Duplex drive assembly

270Remove the duplex drive assembly

271Optional paper feeder assembly (Tray 3)

273Solve problems

274Solve problems checklist

277Current settings pages

278Preboot menu options

279Troubleshooting process

280Power subsystem

282Tools for troubleshooting

283Heartbeat LED, product initialization

285Connectivity LED, product operating

286Connectivity LED

288Connectivity LED, product operating

289HP Jetdirect LEDs

290Engine diagnostics

292Disable cartridge check

293Engine test button

294Paper path test

296Manual sensor test

297Registration sensor

298Fuser loop sensors

299Fuser output sensor

300Duplexer refeed sensor

301Output-bin full sensor

302Fuser pressure-release sensor

303ITB alienation sensor

305Right- and front-door interlock switches

307Tray/bin manual sensor test

308Tray 1 paper sensor

309Tray 2 paper sensor

310Tray 2 cassette sensor

311Tray 2 cassette lifter sensor

312Tray 3 empty sensor

313Tray 3 media feed sensor

314Tray 3 stack surface sensor

315Tray 3 media size sensors

316Component tests

320Location of connectors

321Paper feeder driver PCA

322Plug/jack locations

3291 x 500 paper feeder

330General timing chart

331Circuit diagrams

333Internal print-quality test pages

336Print quality assessment page

338Cleaning page

339Configuration page

341HP embedded Jetdirect page

342Finding important information on the configuration pages

343Color band test

344Print quality troubleshooting tools

345Calibrate the product

346Control panel menus

347Retrieve Job From USB menu

348Retrieve Job From Device Memory menu

352Supplies menu

365Administration menu

367General Settings menu

385Retrieve From USB Settings menu

388Default Print Options menu

391Display Settings menu

392Manage Supplies menu

399Manage Trays menu

401Network Settings menu

418Troubleshooting menu

424Device Maintenance menu

427USB Firmware Upgrade menu

428Interpret control panel messages, status-alert messages, and event code errors

43110.XX.34 Used supply in use

43210.XX.41 Unsupported supply in use

43310.YY.15 Install u0026lt;supplyu0026gt;

43410.YY.35 Incompatible u0026lt;supplyu0026gt;

43511.00.YY Internal clock error

43813.WX.YZ Fuser area jam

43913.WX.YZ Fuser wrap jam

44013.WX.YZ Jam below control panel

44113.WX.YZ Jam in right door

44213.WX.YZ Jam in Tray u0026lt;Xu0026gt;

44941.03.YZ Unexpected size in tray u0026lt;Xu0026gt;

45141.07.YZ Error To continue, press OK

45649.XX.YY To continue, turn off then on

45750.WX.YZ Fuser error To continue, turn off then on

46051.00.YY Error

46154.XX.YY Error

46355.00.YY DC controller error To continue, turn off then on

46457.00.0Y Error To continue, turn off then on

46559.00.YY Error To continue, turn off then on

46660.00.0Y Tray u0026lt;Yu0026gt; lifting error

46881.0X.YY Embedded JetDirect error

46998.00.02 Corrupt data in solutions volume

47099.00.02 Upgrade not performed timeout during receive

47199.00.06 Upgrade not performed error reading upgrade

47299.00.10 Upgrade canceled by user

47399.00.14 Upgrade not performed the file is invalid

47499.09.60 Unsupported disk

47599.09.65 Disk data error

477u0026lt;Supplyu0026gt; very low OR Supplies very low

478u0026lt;Tray Xu0026gt; lifting

479[File System] is not initialized

480Calibration reset pending

481Chosen personality not available To continue, press OK

482Close front door

483Data received To print last page, press OK

484Incompatible u0026lt;supplyu0026gt;

485Install u0026lt;supplyu0026gt;

486Install supplies

487Internal disk spinning up

488Manually feed output stack Then press OK to print second sides

489Moving solenoid and motor

490Please wait...

491Printing Engine Test...

492Printing Help Page...

493Printing Supplies Status Page...

494Processing... copy u0026lt;Xu0026gt; of u0026lt;Yu0026gt;

495Remove shipping lock from Tray 2

496Replace Supplies

497Restore Factory Settings

498Size mismatch in Tray u0026lt;Xu0026gt;

499Tray u0026lt;Xu0026gt; empty: [Type], [Size]

500Tray u0026lt;Xu0026gt; overfilled

501Unsupported supply in use OR Unsupported supply installed To continue, press OK

502USB accessory needs too much power Remove USB and turn off then on

503Wrong cartridge in u0026lt;coloru0026gt; slot

504Event log messages

505Print an event log

506View an event log

508Jam locations

509Clear jams in Tray 1

511Clear jams in the output bin area

512Clear jams in Tray 2

513Clear jams in the right door

517Clear jams in the optional 500-sheet paper and heavy media tray (Tray 3)

518Clear jams in the lower right door (Tray 3)

519Jam causes and solutions

523Jams in the duplex area (duplex models)

524Jams in Tray 1, Tray 2 and internal paper path

526Jams in Tray 3

527Change jam recovery

528Solve paper handling problems

530Use manual print modes

533Solve image quality problems

539Clean the product

540Solve performance problems

541Solve connectivity problems

543Service mode functions

545Product resets

546Product cold reset

547Partial Clean

550Preboot menu options

557Product updates

558USB storage device (Preboot menu)

559USB storage device (control-panel menu)

561Parts and diagrams

562Order parts, accessories, and supplies

563Part numbers

564Customer self repair (CSR) and service kits

570Right-door assembly

572Internal assemblies

574Internal assemblies (2 of 5)

576Internal assemblies (3 of 5)

578Internal assemblies (4 of 5)

580Internal assemblies (5 of 5)

584Paper pickup assembly

590Paper feeder covers

592Paper feeder main body

594Paper feeder cassette

596Paper feeder PCA

598Alphabetical parts list

604Numerical parts list

611Service and support

612Hewlett-Packard limited warranty statement

614HP's Premium Protection Warranty: LaserJet print cartridge limited warranty statement

615Color LaserJet Fuser Kit, Toner Collection Unit, and Transfer Kit Limited Warranty Statement

616Data stored on the print cartridge

617End User License Agreement

621Customer self-repair warranty service

622Customer support

623Product specifications

624Physical specifications

625Regulatory information

626FCC regulations

627Environmental product stewardship program

628Return and recycling instructions

629Residents of Alaska and Hawaii

630Disposal of waste equipment by users in private households in the European Union

631Declaration of conformity

633Certificate of volatility

634Safety statements

635EMC statement (Korea)

636GS statement (Germany)

LASERJET ENTERPRISE 500 COLOR

Service Manual

M551n M551dn M551xh

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