HP LaserJet Enterprise M604, LaserJet Enterprise M605, LaserJet Enterprise M606 Repair Manual and Troubleshooting Manual

LaserJet Enterprise M604, M605, M606

Troubleshooting Manual

3

M604n	M604dn	M605x
M605n	M605dn	M606x
	M606dn

www.hp.com/support/lj604

www.hp.com/support/lj605

www.hp.com/support/lj606

For printer part removal and part numbers information, see the Repair Manual.

Copyright and License

© 2015 Copyright Hewlett-Packard

Development Company, L.P.

Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws.

The information contained herein is subject to change without notice.

The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.

Edition 1, 4/2015

Trademark Credits

Microsoft®, Windows®, Windows® XP, and Windows Vista® are U.S. registered trademarks of Microsoft Corporation.

Conventions used in this guide

TIP: Helpful hints or shortcuts.

Reinstallation tip: Reinstallation helpful hints, shortcuts, or considerations.

NOTE: Information that explains a concept or how to complete a task.

IMPORTANT: Information that help the user to avoid potential printer error conditions.

CAUTION: Procedures that the user must follow to avoid losing data or damaging the printer.

WARNING! Procedures that the user must follow to avoid personal injury, catastrophic loss of data, or extensive damage to the printer.

ENWW

iii

For additional service and support information

HP service personnel, go to the Service Access Work Bench (SAW) at http://h41302.www4.hp.com/km/saw/ home.do.

Channel partners, go to HP Channel Services Network (CNS) at https://h30125.www3.hp.com/hpcsn.

●To access HP PartSurfer information from any mobile device, go to http://partsurfermobile.hp.com/ or scan the Quick Response (QR) code below.

●Install and configure

●Printer specifications

●Up-to-date control-panel message (CPMD) troubleshooting

●Solutions for printer issues and emerging issues

●Remove and replace part instructions and videos

●Service advisories

●Warranty & regulatory information

ENWW

v

Table of contents

1 Theory of operation .......................................................................................................................................	1
Related documentation and software ...................................................................................................................	2
Basic operation ......................................................................................................................................................	3
Sequence of operation ........................................................................................................................	4
Formatter-control system .....................................................................................................................................	5
Sleep mode ..........................................................................................................................................	5
Printer job language (PJL) ...................................................................................................................	6
Printer management language (PML) .................................................................................................	6
Control panel .......................................................................................................................................	6
Easy-access USB port ..........................................................................................................................	7
Wireless ...............................................................................................................................................	7
Near field communication (NFC) ..........................................................................................................	7
CPU .......................................................................................................................................................	7
Input/output ........................................................................................................................................	7
Memory ................................................................................................................................................	7
Firmware ...........................................................................................................................	8
Nonvolatile random access memory (NVRAM) .................................................................	8
Random access memory (RAM) ........................................................................................	8
HP Memory Enhancement technology (MEt) ....................................................................	8
Engine-control system ..........................................................................................................................................	9
DC controller ......................................................................................................................................	10
Motors .............................................................................................................................	11
Fans .................................................................................................................................	11
Solenoids .........................................................................................................................	12
Switches ..........................................................................................................................	12
Sensors ...........................................................................................................................	13
Low-voltage power supply ................................................................................................................	14
Low-voltage power supply voltages description ...........................................................	14
Over-current/over-voltage protection ...........................................................................	15
Sleep mode operation .....................................................................................................	15
Low-voltage power supply failure detection .................................................................	15
High-voltage power supply ...............................................................................................................	16

ENWW

vii

Fuser bias ........................................................................................................................	17
Engine power supply .........................................................................................................................	17
Fuser-control circuit ........................................................................................................	17
Fuser temperature control .............................................................................................	17
Fuser unit life detection ..................................................................................................	18
Fuser unit identification ..................................................................................................	18
Engine laser/scanner system ..............................................................................................................................	19
Laser failure detection ......................................................................................................................	21
Image formation process ..................................................................................................................	22
Step 1: Primary charging ................................................................................................	23
Step 2: Laser-beam exposure .........................................................................................	24
Step 3: Development ......................................................................................................	24
Step 4: Transfer ...............................................................................................................	25
Step 5: Separation ...........................................................................................................	25
Step 6: Fusing ..................................................................................................................	26
Step 7: Drum cleaning .....................................................................................................	26
Step 8: Drum charge elimination ....................................................................................	27
Pickup, feed, and delivery system .......................................................................................................................	28
Photo sensors and switches .............................................................................................................	28
Motors, clutches, and solenoids ........................................................................................................	28
Tray 1 (multipurpose)/Tray 2 (base printer) .....................................................................................	29
Tray 1 paper pickup and feed .........................................................................................	29
Tray 2 paper presence detection ....................................................................................	29
Tray 2 paper pickup and feed .........................................................................................	30
Tray 2 multiple-feed prevention .....................................................................................	30
Tray 2 tray presence detection .......................................................................................	31
Tray 2 skew feed prevention ...........................................................................................	31
Duplexer ............................................................................................................................................	32
Duplexing reverse and duplex feed control ...................................................................	32
Side registration adjustment operation (DP) .................................................................	34
Jam detection/prevention .................................................................................................................	35
Fuser wrapping jam detection ........................................................................................	39
Pressure roller pressurization and depressurization control ......................	39
Input accessories .................................................................................................................................................	41
Trays 3-6 ...........................................................................................................................................	42
Trays 3-6 driver PCA .......................................................................................................	42
Trays 3-6 motor control ..................................................................................................	43
Trays 3-6 electrical components ....................................................................................	43
Trays 3-6 media size detection ......................................................................................	44
Trays 3-6 paper pickup ...................................................................................................	44
Trays 3-6 multiple feed prevention ................................................................................	45

viii

ENWW

Trays 3-6 tray presence detection ..................................................................................	45
Trays 3-6 tray lift operation ...........................................................................................	45
Trays 3-6 jam detection ..................................................................................................	45
High-capacity input (HCI) feeder .......................................................................................................	46
HCI driver PCA ..................................................................................................................	46
HCI motor control ............................................................................................................	47
HCI electrical components ..............................................................................................	48
HCI media size detection .................................................................................................	48
HCI paper pickup .............................................................................................................	48
HCI multiple feed prevention ..........................................................................................	49
HCI tray lift operation .....................................................................................................	50
HCI jam detection ............................................................................................................	51
Envelope feeder ................................................................................................................................	52
Envelope feeder driver PCA ............................................................................................	52
Envelope feeder motor control .......................................................................................	52
Envelope feeder electrical components .........................................................................	53
Envelope feeder paper pickup ........................................................................................	54
Envelope feeder multiple feed prevention .....................................................................	54
Envelope feeder multiple feed detection .......................................................................	54
Envelope feeder jam detection .......................................................................................	56
Duplexer ............................................................................................................................................	57
Duplexer driver PCA ........................................................................................................	57
Duplexer motor control ..................................................................................................	57
Duplexer electrical components .....................................................................................	58
Duplexer paper pickup ....................................................................................................	59
Side registration adjustment operation (DP) ...............................................	60
Duplexer jam detection ...................................................................................................	62
2 Solve problems ............................................................................................................................................	63
For additional service and support .....................................................................................................................	64
Solve problems checklist .....................................................................................................................................	65
Solve problems checklist ...................................................................................................................	65
Print the configuration page .............................................................................................................	68
Print menu map .................................................................................................................................	69
Print current settings pages .............................................................................................................	70
Print event log ...................................................................................................................................	70
Pre-boot menu options .....................................................................................................................	73
Remote Admin .................................................................................................................	82
Required software and network connection ................................................	82
Connect a remote connection .......................................................................	84
Disconnect a remote connection ..................................................................	88

ENWW

ix

Troubleshooting process .....................................................................................................................................	91
Determine the problem source .........................................................................................................	91
Troubleshooting owchart .............................................................................................	91
Power subsystem ..............................................................................................................................	92
Power-on checks .............................................................................................................	92
Power-on troubleshooting overview ...........................................................	92
Control panel checks .........................................................................................................................	95
Control-panel diagnostics ..............................................................................................	96
Touchscreen diagnostic mode (M605x and M606x only) ............................	96
Control-panel system diagnostics (touchscreen control panel) ...............	100
Control panel diagnostic owcharts (M605x and M606x only) ...................................	115
Touchscreen black, white, or dim (no image) ............................................	116
Touchscreen is slow to respond or requires multiple presses to
respond .......................................................................................................	117
Touchscreen has an unresponsive zone ....................................................	118
No control panel sound ..............................................................................	119
Home button is unresponsive ....................................................................	120
Hardware integration pocket (HIP) is not functioning (control panel
functional) ..................................................................................................	121
Tools for troubleshooting ..................................................................................................................................	122
Individual component diagnostics ..................................................................................................	122
Tools for troubleshooting: LED diagnostics .................................................................	122
Understand lights on the formatter ...........................................................	122
Tools for troubleshooting: Engine diagnostics ............................................................	123
Engine test button ......................................................................................	123
Defeating interlocks ...................................................................................	124
Disable cartridge check ..............................................................................	125
Tools for troubleshooting: Paper path and sensor diagnostic tests ...........................	126
Paper path test ...........................................................................................	126
Paper path sensors test .............................................................................	127
Manual sensor tests ...................................................................................	129
Tray/bin manual sensor test ......................................................................	131
Tools for troubleshooting: Print/stop test ...................................................................	133
Tools for troubleshooting: Component tests ...............................................................	134
Individual component diagnostics (special-mode test) ............................	134
Diagrams .........................................................................................................................................	136
Diagrams: Block diagrams ............................................................................................	136
Sensors and switches .................................................................................	136
Cross section diagrams ..............................................................................	141
Diagrams: Printed circuit assembly (PCA) connector locations ...................................	146
DC controller connections ..........................................................................	146

x

ENWW

Formatter PCA ............................................................................................	148
Printer base connectors .............................................................................	149
1x500-sheet feeder connectors ................................................................	150
1,500-sheet high-capacity feeder connectors ..........................................	150
Duplexer connectors ..................................................................................	151
Envelope feeder connectors ......................................................................	151
Diagrams: External plug and port locations .................................................................	151
Diagrams: Locations of major assemblies ...................................................................	153
Main assemblies (printer base) ..................................................................	153
Motors and fans (printer base) ...................................................................	155
Printed circuit assemblies (PCAs; printer base) .........................................	156
1x500-sheet paper feeder .........................................................................	157
1x1500-sheet paper feeder .......................................................................	158
Diagrams: General timing chart ...................................................................................	160
Diagrams: General circuit diagrams .............................................................................	161
Internal print-quality test pages ....................................................................................................	168
Print a configuration page ............................................................................................	168
HP embedded Jetdirect page .....................................................................	170
Wireless page .............................................................................................	171
Finding important information on the configuration pages .....................	173
Print a fuser test page ..................................................................................................	174
Print a cleaning page ....................................................................................................	176
Enable and configure auto cleaning ...........................................................	176
Control-panel menus ......................................................................................................................	177
Administration menu ....................................................................................................	177
Reports menu .............................................................................................	177
General Settings menu ...............................................................................	179
General Print Settings menu ......................................................................	184
Default Print Options menu .......................................................................	187
Display Settings menu ...............................................................................	189
Manage Supplies menu ..............................................................................	191
Manage Trays menu ...................................................................................	193
Stapler/Stacker Settings menu ..................................................................	195
Network Settings menu .............................................................................	196
Troubleshooting menu ...............................................................................	207
Device Maintenance menu ............................................................................................	210
Backup/Restore menu ................................................................................	210
Calibration/Cleaning menu .........................................................................	210
USB Firmware Upgrade menu ....................................................................	212
Service menu ..............................................................................................	212
Control panel message document (CPMD) .....................................................................................	213

ENWW

xi

Control-panel message types ......................................................................................	213
Control-panel messages and event log entries ...........................................................	213
10.XX.YZ Error Messages ...........................................................................	213
11.XX.YZ Error Messages ...........................................................................	219
13.XX.YZ Error Messages ...........................................................................	219
20.XX.YZ Error Messages ...........................................................................	237
32.XX.YX and 33.XX.YZ Error Messages ....................................................	238
40.XX.YZ Error Messages ...........................................................................	245
41.XX.YZ Error Messages ...........................................................................	246
42.XX.YZ Error Messages ...........................................................................	254
47.XX.XX Error Messages ...........................................................................	254
48.XX.YY Error Messages ...........................................................................	256
49.XX.YY Error Messages ...........................................................................	256
50.WX.YZ Error Messages ..........................................................................	257
51.XX.YZ, 52.XX.YZ Error Messages ..........................................................	261
54.XX.YZ Error Messages ...........................................................................	261
55.XX.YZ, 56.XX.YZ Error Messages ..........................................................	262
57.XX.YZ Error Messages ...........................................................................	263
58.XX.YZ Error Messages ...........................................................................	265
59.XX.YZ Error Messages ...........................................................................	266
60.00.0Y, 62.00.00 Error Messages ...........................................................	268
65.X0.AZ Error Messages ...........................................................................	269
66.WX.YZ Error Messages ..........................................................................	269
70.XX.YY Error Messages ...........................................................................	271
80.XX.YY, 82.XX.YY Error Messages ...........................................................	271
98.0X.0Y Error Messages ...........................................................................	273
99.XX.YY Error Messages ...........................................................................	274
Alpha Error Messages .................................................................................	281
Tools for troubleshooting: Event log messages ..........................................................	311
Print or view an event log ...........................................................................	312
Clear the event log .....................................................................................	313
Solve image-quality problems ..........................................................................................................................	314
Improve print quality ......................................................................................................................	314
Repetitive image defect ruler .......................................................................................	314
Use a ruler to measure between repetitive defects ..................................	315
Print-quality troubleshooting pages ............................................................................	318
Print from a different software program .....................................................................	322
Check the paper-type setting for the print job ............................................................	322
Check toner-cartridge status .......................................................................................	322
Clean the printer ...........................................................................................................	323
Print a cleaning page ..................................................................................	323

xii

ENWW

Visually inspect the toner cartridge or cartridges .......................................................	324
Check paper and the printing environment .................................................................	324
Use manual print modes ...............................................................................................	324
Image defects table ......................................................................................................	327
Clean the printer ................................................................................................................................................	335
Clean the paper path .......................................................................................................................	335
Print a cleaning page .......................................................................................................................	335
Clean the Tray 1 rollers ...................................................................................................................	336
Step 1: Remove the Tray 1 rollers ................................................................................	336
Step 2: Clean the Tray 1 rollers .....................................................................................	339
Step 3: Install the Tray 1 rollers ....................................................................................	340
Clean the Tray 2-X rollers ................................................................................................................	345
Step 1: Remove the tray ...............................................................................................	345
Step 2: Remove the pickup, feed, and separation rollers ............................................	345
Step 3: Clean the Tray 2-X rollers .................................................................................	347
Step 4: Install the pickup, feed, and separation rollers ...............................................	347
Step 5: Install the tray ..................................................................................................	350
Clean the 1,500-sheet high capacity input (HCI) feeder rollers .....................................................	351
Step 1: Remove the pickup, feed, and separation rollers ............................................	351
Step 2: Clean the HCI rollers .........................................................................................	353
Step 3: Install the pickup, feed, and separation rollers ...............................................	353
Solve paper handling problems ........................................................................................................................	357
Product feeds incorrect page size ...................................................................................................	357
Product pulls from incorrect tray ....................................................................................................	357
Product will not duplex or duplexes incorrectly .............................................................................	357
Paper does not feed from Tray 2-X .................................................................................................	358
Output is curled or wrinkled ............................................................................................................	358
Product does not pick up paper or misfeeds ..................................................................................	359
The product does not pick up paper .............................................................................	359
The product picks up multiple sheets of paper ............................................................	360
Paper does not feed automatically ..............................................................................	360
Clear paper jams ................................................................................................................................................	361
Paper path jam sensor locations ....................................................................................................	362
Auto-navigation for clearing jams ..................................................................................................	365
Experiencing frequent or recurring paper jams? ............................................................................	365
Clear paper jams in Tray 1 ...............................................................................................................	367
Clear paper jams in Tray 2 and the 500-sheet trays ......................................................................	368
Clear paper jams in the optional 1,500-sheet high-capacity tray .................................................	370
Clear paper jams in the toner-cartridge area .................................................................................	372
Clear paper jams in the rear output bin ..........................................................................................	375
Clear paper jams in the fuser area ..................................................................................................	376

ENWW

xiii

Clear paper jams in the output bin ..................................................................................................		381
Clear paper jams in the duplexer ....................................................................................................		382
Clear paper jams in the envelope feeder ........................................................................................		384
Clear paper jams in the 5-bin mailbox ............................................................................................		386
Clear jams in the stacker or stapler/stacker ...................................................................................		388
Clear paper jams in the stacker or stapler/stacker ......................................................		388
Clear staple jams in the stapler/stacker .......................................................................		389
Change jam recovery .......................................................................................................................		391
Solve performance problems ............................................................................................................................		392
Factors affecting print performance ...............................................................................................		392
Print speeds .....................................................................................................................................		393
The product does not print or it prints slowly ................................................................................		393
The product prints slowly ...............................................................................................................		394
Solve connectivity problems	.............................................................................................................................	395
Solve USB connection problems .....................................................................................................		395
Solve wired network problems .......................................................................................................		395
Poor physical connection ..............................................................................................		395
The computer is using the incorrect IP address for the product ..................................		395
The computer is unable to communicate with the product .........................................		396
The product is using incorrect link and duplex settings for the network ....................		396
New software programs might be causing compatibility problems ...........................		396
The computer or workstation might be set up incorrectly ..........................................		396
The product is disabled, or other network settings are incorrect ...............................		396
Service mode functions .....................................................................................................................................		397
Service menu ...................................................................................................................................		397
Product resets .................................................................................................................................		398
Restore factory-set defaults ........................................................................................		398
Restore the service ID ...................................................................................................		399
Product cold reset .........................................................................................................		400
Format Disk and Partial Clean functions ........................................................................................		401
Active and repository firmware locations ....................................................................		401
Partial Clean ..................................................................................................................		401
	Execute a Partial Clean ...............................................................................	402
Format Disk ...................................................................................................................		402
	Execute a Format Disk ................................................................................	403
Firmware upgrades ............................................................................................................................................		405
Determine the installed revision of firmware .................................................................................		406
Perform a firmware upgrade ..........................................................................................................		407
HP Embedded Web Server ............................................................................................		407
USB	ash drive (Pre-boot menu) ..................................................................................	408
USB	ash drive (control-panel menu) ..........................................................................	410

xiv

ENWW

Appendix A Printer specifications ..................................................................................................................	411
Printer dimensions ............................................................................................................................................	412
Dimensions for the products, as sold .............................................................................................	412
Dimensions for the input and output accessories ..........................................................................	414
Dimensions for sample combinations of the products and optional accessories .........................	418
Combination one ...........................................................................................................	418
Combination two ...........................................................................................................	419
Combination three ........................................................................................................	419
Printer space requirements ...............................................................................................................................	421
Power consumption, electrical specifications, and acoustic emissions ...........................................................	422
Operating-environment range ..........................................................................................................................	423
Certificate of Volatility .......................................................................................................................................	424
Index ...........................................................................................................................................................	427

ENWW

xv

List of tables

Table 1-1 Sequence of operation ..........................................................................................................................................		4
Table 1-2	Motors .................................................................................................................................................................	11
Table 1-3	Fans .....................................................................................................................................................................	11
Table 1-4	Solenoids ............................................................................................................................................................	12
Table 1-5	Switches ..............................................................................................................................................................	12
Table 1-6	Sensors ...............................................................................................................................................................	13
Table 1-7 Converted DC voltages .......................................................................................................................................		14
Table 1-8 Image formation process ...................................................................................................................................		23
Table 1-9 Media presence and size detection (Tray 2 and 1x500sheet feeder) ..............................................................		29
Table 1-10 Jam detection sensors .....................................................................................................................................		36
Table 1-11 Jams that the printer detects ...........................................................................................................................		36
Table 2-1 Pre-boot menu options (1 of 7) ..........................................................................................................................		76
Table 2-2 Pre-boot menu options (2 of 7) ..........................................................................................................................		77
Table 2-3 Pre-boot menu options (3 of 7) ..........................................................................................................................		78
Table 2-4 Pre-boot menu options (4 of 7) ..........................................................................................................................		78
Table 2-5 Pre-boot menu options (5 of 7) ..........................................................................................................................		79
Table 2-6 Pre-boot menu options (6 of 7) ..........................................................................................................................		80
Table 2-7 Pre-boot menu options (7 of 7) ..........................................................................................................................		81
Table 2-8	Troubleshooting owchart .................................................................................................................................	91
Table 2-9 Paper-path sensors diagnostic tests ...............................................................................................................		127
Table 2-10 Manual sensor diagnostic tests .....................................................................................................................		130
Table 2-11 Tray/bin manual sensors ................................................................................................................................		132
Table 2-12 Component test details ..................................................................................................................................		135
Table 2-13 Product base, sensors and switches block diagram ......................................................................................		136
Table 2-14 1x500-sheet paper feeder, sensors and switches block diagram ................................................................		137
Table 2-15 1,500-sheet high capacity input feeder, sensors and switches block diagram ............................................		138
Table 2-16 Envelope feeder, sensors and switches block diagram .................................................................................		139
Table 2-17 Duplexer, sensors and switches block diagram .............................................................................................		140
Table 2-18 Product base, cross section diagram .............................................................................................................		141
Table 2-19 1x500-sheet paper feeder, cross section diagram ........................................................................................		142
Table 2-20 1,500-sheet high capacity input (HCI) feeder, cross section diagram ...........................................................		143
Table 2-21 Envelope feeder, cross section diagram ........................................................................................................		144

ENWW

xvii

Table 2-22 Duplexer, cross section diagram ....................................................................................................................		145
Table 2-23 Tray, cross section diagram ............................................................................................................................		145
Table 2-24 DC controller connectors ................................................................................................................................		146
Table 2-25 Formatter PCA ................................................................................................................................................		148
Table 2-26 External plug and port locations ....................................................................................................................		152
Table 2-27 Main assemblies (1 of 2; printer base) ...........................................................................................................		153
Table 2-28 Main assemblies (2 of 2; printer base) ...........................................................................................................		154
Table 2-29 Motors and fans (printer base) .......................................................................................................................		155
Table 2-30 PCAs (printer base) .........................................................................................................................................		156
Table 2-31 Main assemblies (1x500-sheet paper feeder) ...............................................................................................		157
Table 2-32 Printed circuit assembly and solenoid (1x500-sheet paper feeder) .............................................................		157
Table 2-33 Main assemblies (1x1500-sheet paper feeder) .............................................................................................		158
Table 2-34 Printed circuit assembly (PCA) and motor (1x1500-sheet paper feeder) .....................................................		158
Table 2-35 Printed circuit assembly (PCA) and motor (1x1500-sheet paper feeder) .....................................................		159
Table 2-36	Configuration page .........................................................................................................................................	169
Table 2-37 HP embedded Jetdirect page .........................................................................................................................		170
Table 2-38	Wireless page .................................................................................................................................................	171
Table 2-39 Important information on the configuration pages ......................................................................................		173
Table 2-40 Reports menu .................................................................................................................................................		177
Table 2-41 General Settings menu ...................................................................................................................................		179
Table 2-42 General Print Settings menu ..........................................................................................................................		184
Table 2-43 Default Print Options menu ...........................................................................................................................		187
Table 2-44 Display Settings menu ...................................................................................................................................		189
Table 2-45 Manage Supplies menu ..................................................................................................................................		191
Table 2-46 Manage Trays menu .......................................................................................................................................		193
Table 2-47 Default Print Options menu ...........................................................................................................................		195
Table 2-48 Network Settings menu .................................................................................................................................		196
Table 2-49 Embedded Jetdirect Menu ..............................................................................................................................		196
Table 2-50 Troubleshooting menu ...................................................................................................................................		207
Table 2-51 Backup/Restore menu ....................................................................................................................................		210
Table 2-52 Sample event log page ...................................................................................................................................		311
Table 2-53	Repetitive defects ..........................................................................................................................................	314
Table 2-54 Print modes under the Adjust Paper Types submenu ...................................................................................		326
Table 2-55 Print modes under the Optimize submenu ....................................................................................................		326
Table 2-56 Image defects table ........................................................................................................................................		327
Table 2-57 Product feeds incorrect page size ..................................................................................................................		357
Table 2-58 Product pulls from incorrect tray ...................................................................................................................		357
Table 2-59 Product will not duplex (print 2-sided jobs) or duplexes incorrectly ............................................................		357
Table 2-60 Paper does not feed from Tray 2-X ................................................................................................................		358
Table 2-61 Output is curled or wrinkled ...........................................................................................................................		358
Table 2-62 Paper does not feed automatically ................................................................................................................		360

xviii

ENWW

Table 2-63 Product base jam sensors ..............................................................................................................................		362
Table 2-64 1x500-sheet paper-feeder jam sensors ........................................................................................................		363
Table 2-65	1,500-sheet high-capacity input (HCI) feeder jam sensors ..........................................................................	364
Table 2-66	Duplexer jam sensors .....................................................................................................................................	365
Table 2-67	Solve performance problems .........................................................................................................................	392
Table A-1	Operating-environment specifications ............................................................................................................	423

ENWW

xix

List of figures

Figure 1-1 Relationship between the main printer systems		............................................................................................... 3
Figure 1-2	Engine-control system ........................................................................................................................................	9
Figure 1-3 DC controller block diagram ..............................................................................................................................		10
Figure 1-4 Low-voltage power-supply circuit ....................................................................................................................		14
Figure 1-5 High-voltage power supply circuits ..................................................................................................................		16
Figure 1-6	Fuser control .....................................................................................................................................................	17
Figure 1-7 Fuser temperature-control circuit ....................................................................................................................		18
Figure 1-8	Laser/scanner system .......................................................................................................................................	20
Figure 1-9	Image-formation system ..................................................................................................................................	22
Figure 1-10	Image-formation process ...............................................................................................................................	23
Figure 1-11	Primary charging .............................................................................................................................................	24
Figure 1-12 Laser-beam exposure .....................................................................................................................................		24
Figure 1-13	Development ...................................................................................................................................................	25
Figure 1-14	Primary transfer ..............................................................................................................................................	25
Figure 1-15	Separation .......................................................................................................................................................	26
Figure 1-16	Fusing ..............................................................................................................................................................	26
Figure 1-17	Drum cleaning .................................................................................................................................................	27
Figure 1-18 Drum charge elimination ................................................................................................................................		27
Figure 1-19	Photo sensors .................................................................................................................................................	28
Figure 1-20 Tray 2 multiple-feed prevention .....................................................................................................................		31
Figure 1-21	Skew-feed prevention .....................................................................................................................................	32
Figure 1-22 Duplex block diagram .....................................................................................................................................		34
Figure 1-23 Side registration adjustment operation (DP) .................................................................................................		35
Figure 1-24 Jam detection sensors ....................................................................................................................................		36
Figure 1-25 Pressure roller pressure release control ........................................................................................................		40
Figure 1-26 1 x 500-sheet paper feeder ............................................................................................................................		42
Figure 1-27 1 x 500-sheet paper feeder block diagram ....................................................................................................		43
Figure 1-28 1 x 500-sheet paper feeder circuit diagram ...................................................................................................		44
Figure 1-29	HCI ...................................................................................................................................................................	46
Figure 1-30 HCI block diagram ...........................................................................................................................................		47
Figure 1-31 HCI circuit diagram ..........................................................................................................................................		48
Figure 1-32	HCI lift ..............................................................................................................................................................	50

ENWW

xxi

Figure 1-33	Envelope feeder ..............................................................................................................................................	52
Figure 1-34 Envelope feeder block diagram ......................................................................................................................		53
Figure 1-35 Envelope feeder circuit diagram .....................................................................................................................		53
Figure 1-36 Envelope feeder multiple feed detection .......................................................................................................		55
Figure 1-37 Envelope feeder jam detection .......................................................................................................................		56
Figure 1-38	Duplexer ..........................................................................................................................................................	57
Figure 1-39 Envelope feeder block diagram ......................................................................................................................		58
Figure 1-40 Duplexer circuit diagram .................................................................................................................................		59
Figure 1-41 Side registration adjustment operation (DP) .................................................................................................		61
Figure 1-42 Envelope feeder jam detection .......................................................................................................................		62
Figure 2-1 Open the Pre-boot menu ..................................................................................................................................		73
Figure 2-2 Pre-boot menu ..................................................................................................................................................		74
Figure 2-3 Open the Pre-boot menu ..................................................................................................................................		75
Figure 2-4 Open the Control Panel .....................................................................................................................................		83
Figure 2-5 Turn Windows features on or off ......................................................................................................................		83
Figure 2-6 Enable the telnet client feature ........................................................................................................................		84
Figure 2-7 Select the +3:Administrator item .....................................................................................................................		85
Figure 2-8 Select the +A:Remote Admin item ....................................................................................................................		85
Figure 2-9 Select the 1:Start Telnet item ...........................................................................................................................		85
Figure 2-10 Telnet connecting message ............................................................................................................................		85
Figure 2-11 Telnet error message ......................................................................................................................................		86
Figure 2-12 Telnet server function initialized ....................................................................................................................		86
Figure 2-13 Open a command window ...............................................................................................................................		87
Figure 2-14 Start a telnet session ......................................................................................................................................		87
Figure 2-15 Establish a telnet connection .........................................................................................................................		87
Figure 2-16	Enter the PIN ...................................................................................................................................................	88
Figure 2-17 Remote Admin window ...................................................................................................................................		88
Figure 2-18 Access the administrator menu ......................................................................................................................		89
Figure 2-19 Access the remote admin menu ......................................................................................................................		89
Figure 2-20 Terminate the telnet connection ....................................................................................................................		90
Figure 2-21 Diagnostic-tests access button ......................................................................................................................		96
Figure 2-22 Press the diagnostics-access button ..............................................................................................................		97
Figure 2-23 Control-panel version A yellow screen ...........................................................................................................		97
Figure 2-24 Touch the screen to advance colored screens ................................................................................................		98
Figure 2-25 Exit the diagnostic mode ................................................................................................................................		99
Figure 2-26 Open the Pre-boot menu ..............................................................................................................................		100
Figure 2-27 Pre-boot menu ..............................................................................................................................................		101
Figure 2-28 Access the administration menu ..................................................................................................................		102
Figure 2-29 Access the diagnostics menu ........................................................................................................................		102
Figure 2-30 Open the screen test .....................................................................................................................................		103
Figure 2-31 Blue vertical gradient screen ........................................................................................................................		103

xxii

ENWW

Figure 2-32 Open the touch test ......................................................................................................................................		107
Figure 2-33 Touch the white grid .....................................................................................................................................		107
Figure 2-34 Verify the mark .............................................................................................................................................		108
Figure 2-35 Open the softkey test ...................................................................................................................................		109
Figure 2-36 Touch the Home button ................................................................................................................................		109
Figure 2-37	Successful test ..............................................................................................................................................	110
Figure 2-38 Open the backlight test .................................................................................................................................		111
Figure 2-39 Open the sound test ......................................................................................................................................		112
Figure 2-40 Do not open the keyboard test .....................................................................................................................		113
Figure 2-41 Open the sound test ......................................................................................................................................		114
Figure 2-42 Touchscreen blank, white, or dim (no image) ..............................................................................................		116
Figure 2-43 Touchscreen is slow to respond or requires multiple presses to respond ...................................................		117
Figure 2-44 Touchscreen has an unresponsive zone .......................................................................................................		118
Figure 2-45 No control panel sound .................................................................................................................................		119
Figure 2-46 Home button is unresponsive .......................................................................................................................		120
Figure 2-47 Hardware integration pocket (HIP) is not functioning (control panel functional) .......................................		121
Figure 2-48 Engine test button ........................................................................................................................................		123
Figure 2-49	Defeating interlocks ......................................................................................................................................	124
Figure 2-50 Printer base, sensors and switches block diagram ......................................................................................		136
Figure 2-51 1x500-sheet paper feeder, sensors and switches block diagram ...............................................................		137
Figure 2-52 1,500-sheet high capacity input feeder, sensors and switches block diagram ..........................................		138
Figure 2-53 Envelope feeder, sensors and switches block diagram ...............................................................................		139
Figure 2-54 Duplexer, sensors and switches block diagram ...........................................................................................		140
Figure 2-55 Printer base, cross section diagram .............................................................................................................		141
Figure 2-56 1x500-sheet paper feeder, cross section diagram ......................................................................................		142
Figure 2-57 1,500-sheet high capacity input (HCI) feeder, cross section diagram .........................................................		143
Figure 2-58 Envelope feeder, cross section diagram .......................................................................................................		144
Figure 2-59 Duplexer, cross section diagram ...................................................................................................................		145
Figure 2-60 Tray, cross section diagram ..........................................................................................................................		145
Figure 2-61 DC controller PCA connectors .......................................................................................................................		146
Figure 2-62	Formatter PCA ...............................................................................................................................................	148
Figure 2-63 Printer base connectors ................................................................................................................................		149
Figure 2-64 1x500-sheet feeder connectors ...................................................................................................................		150
Figure 2-65 1,500-sheet high-capacity feeder connectors ............................................................................................		150
Figure 2-66 Stapling mailbox connectors ........................................................................................................................		151
Figure 2-67 Envelope feeder connectors .........................................................................................................................		151
Figure 2-68 External plug and port locations ..................................................................................................................		152
Figure 2-69 Main assemblies (1 of 2; printer base) .........................................................................................................		153
Figure 2-70 Main assemblies (2 of 2; printer base) .........................................................................................................		154
Figure 2-71 Motors and fans (printer base) .....................................................................................................................		155
Figure 2-72 PCAs (printer base) .......................................................................................................................................		156

ENWW

xxiii

Figure 2-73 Main assemblies (1x500-sheet paper feeder) .............................................................................................		157
Figure 2-74 Printed circuit assembly and solenoid (1x500-sheet paper feeder) ...........................................................		157
Figure 2-75 Main assemblies (1x1500-sheet paper feeder) ...........................................................................................		158
Figure 2-76 Printed circuit assembly (PCA) and motor (1x1500-sheet paper feeder) ...................................................		158
Figure 2-77 Printed circuit assembly (PCA) and motor (1x1500-sheet paper feeder) ...................................................		159
Figure 2-78 General timing chart .....................................................................................................................................		160
Figure 2-79 General circuit diagram for the printer base (1 of 3) ...................................................................................		161
Figure 2-80 General circuit diagram for the printer base (2 of 3) ...................................................................................		162
Figure 2-81 General circuit diagram for the printer base (3 of 3) ...................................................................................		163
Figure 2-82 General circuit diagram for the 1x500-sheet feeder ...................................................................................		164
Figure 2-83 General circuit diagram for the 1,500-sheet high-capacity feeder (HCI) ....................................................		165
Figure 2-84 General circuit diagram for the envelope feeder .........................................................................................		166
Figure 2-85 General circuit diagram for the duplexer .....................................................................................................		167
Figure 2-86	Configuration page .......................................................................................................................................	169
Figure 2-87	Configuration page .......................................................................................................................................	170
Figure 2-88	Wireless page ................................................................................................................................................	171
Figure 2-89 Print a fuser test page ..................................................................................................................................		175
Figure 2-90 Paper Tray guides .........................................................................................................................................		220
Figure 2-91 Paper Tray overfill guide ...............................................................................................................................		220
Figure 2-92 Paper Tray guides .........................................................................................................................................		222
Figure 2-93 Paper Tray overfill guide ...............................................................................................................................		222
Figure 2-94 Paper Tray guides .........................................................................................................................................		224
Figure 2-95 Paper Tray overfill guide ...............................................................................................................................		224
Figure 2-96 Paper Tray guides .........................................................................................................................................		226
Figure 2-97 Paper Tray overfill guide ...............................................................................................................................		226
Figure 2-98 Sample event log ..........................................................................................................................................		311
Figure 2-99 Examples of repetitive defects .....................................................................................................................		316
Figure 2-100 Place the ruler on the page .........................................................................................................................		317
Figure 2-101 Locate the next repetitive defect ...............................................................................................................		317
Figure 2-102 Determine the defective assembly ............................................................................................................		318
Figure 2-103 Print-quality troubleshooting procedure page ..........................................................................................		320
Figure 2-104 Black print-quality troubleshooting page ..................................................................................................		321
Figure 2-105 Open the front cover ...................................................................................................................................		336
Figure 2-106 Open the separation roller cover ................................................................................................................		336
Figure 2-107 Slide the separation roller ..........................................................................................................................		337
Figure 2-108 Remove the separation roller .....................................................................................................................		337
Figure 2-109 Remove one screw ......................................................................................................................................		338
Figure 2-110 Remove the bushing ...................................................................................................................................		338
Figure 2-111 Remove the cover .......................................................................................................................................		339
Figure 2-112 Remove the Tray 1 pickup and feed rollers ................................................................................................		339
Figure 2-113 Clean the rollers ..........................................................................................................................................		340

xxiv

ENWW

Figure 2-114 Install the Tray 1 pickup and feed rollers ...................................................................................................		340
Figure 2-115 Remove the cover .......................................................................................................................................		341
Figure 2-116 Install the bushing ......................................................................................................................................		342
Figure 2-117 Install one screw .........................................................................................................................................		342
Figure 2-118 Open the separation roller cover ................................................................................................................		343
Figure 2-119 Position the separation roller .....................................................................................................................		343
Figure 2-120 Install the separation roller ........................................................................................................................		344
Figure 2-121 Close the front cover ...................................................................................................................................		344
Figure 2-122 Remove the tray .........................................................................................................................................		345
Figure 2-123	Open the cover ............................................................................................................................................	345
Figure 2-124 Remove the feed roller ...............................................................................................................................		346
Figure 2-125 Remove the feed roller ...............................................................................................................................		346
Figure 2-126 Remove the pick roller ................................................................................................................................		347
Figure 2-127 Clean the rollers ..........................................................................................................................................		347
Figure 2-128 Install the pick roller ...................................................................................................................................		348
Figure 2-129 Install the feed roller ..................................................................................................................................		348
Figure 2-130	Open the cover ............................................................................................................................................	349
Figure 2-131 Align the torque limiter ...............................................................................................................................		349
Figure 2-132 Install the feed roller ..................................................................................................................................		350
Figure 2-133	Install the tray .............................................................................................................................................	350
Figure 2-134 Open the feeder door ..................................................................................................................................		351
Figure 2-135 Open the separation-roller cover ...............................................................................................................		351
Figure 2-136 Remove the separation roller .....................................................................................................................		352
Figure 2-137 Remove the feed roller ...............................................................................................................................		352
Figure 2-138 Remove the pick roller ................................................................................................................................		353
Figure 2-139 Clean the rollers ..........................................................................................................................................		353
Figure 2-140 Install the pick roller ...................................................................................................................................		354
Figure 2-141 Install the feed roller ..................................................................................................................................		354
Figure 2-142 Open the separation-roller cover ...............................................................................................................		355
Figure 2-143 Check the torque limiter .............................................................................................................................		355
Figure 2-144 Install the feed roller ..................................................................................................................................		356
Figure 2-145 Close the feeder door .................................................................................................................................		356
Figure 2-146 Product base jam sensors ..........................................................................................................................		362
Figure 2-147 1x500-sheet paper-feeder jam sensors ....................................................................................................		363
Figure 2-148 1,500-sheet high-capacity input (HCI) feeder jam sensors .......................................................................		364
Figure 2-149 Duplexer jam sensors .................................................................................................................................		365
Figure 2-150 Open the Pre-boot menu ............................................................................................................................		400
Figure 2-151 Open the Pre-boot menu ............................................................................................................................		402
Figure 2-152 Open the Pre-boot menu ............................................................................................................................		403
Figure 2-153 Open the Pre-boot menu ............................................................................................................................		408
Figure A-1 Dimensions for the n models ..........................................................................................................................		412

ENWW

xxv

Figure A-2 Dimensions for the dn models ........................................................................................................................		413
Figure A-3 Dimensions for the x models ..........................................................................................................................		414
Figure A-4 Dimensions for the 1 x 500-sheet paper feeder ............................................................................................		414
Figure A-5 Dimensions for the 1,500-sheet high-capacity input tray ............................................................................		415
Figure A-6	Dimensions for the stacker .............................................................................................................................	416
Figure A-7	Dimensions for the stapler/stacker ................................................................................................................	416
Figure A-8	Dimensions for the 5-bin mailbox ..................................................................................................................	417
Figure A-9	Dimensions for the printer stand ...................................................................................................................	417
Figure A-10 Dimensions for Combination one .................................................................................................................		418
Figure A-11 Dimensions for Combination two .................................................................................................................		419
Figure A-12 Dimensions for Combination three ..............................................................................................................		420
Figure A-13 Certificate of Volatility 1 of 2) ......................................................................................................................		424
Figure A-14 Certificate of Volatility (2 of 2) .....................................................................................................................		425

xxvi

ENWW

1Theory of operation

●Related documentation and software

●Basic operation

●Formatter-control system

●Engine-control system

●Engine laser/scanner system

●Pickup, feed, and delivery system

●Input accessories

ENWW

1

Related documentation and software

HP service personnel, go to the Service Access Work Bench (SAW) at http://h41302.www4.hp.com/km/saw/ home.do.

Channel partners, go to HP Channel Services Network (CSN) at https://h30125.www3.hp.com/hpcsn.

2 Chapter 1 Theory of operation

ENWW

Basic operation

The printer routes all high-level processes through the formatter, which stores font information, processes the print image, and communicates with the host computer.

The basic printer operation comprises the following systems:

●The engine-control system, which includes the power supply and the DC controller printed circuit assembly (PCA)

●The laser/scanner system, which forms the latent image on the photosensitive drum

●The image-formation system, which transfers a toner image onto the paper

●The media feed system, which uses a system of rollers and belts to transport the paper through the printer

●Accessory (optional paper feeder)

Figure 1-1 Relationship between the main printer systems

Laser scanner system

Image-formation system

Engine-control system

Pickup, feed and delivery system

Accessory

ENWW	Basic operation 3

Sequence of operation

The DC controller PCA controls the operating sequence. The following table describes the basic operating sequence from when the printer power is turned on until the final printed page is delivered to an output bin.

NOTE: The printer takes about two minutes and twenty seconds to initialize.

Table 1-1 Sequence of operation

Period	Duration	Description
Waiting	From the time the power is turned on, the door is	●	Brings the printer to standby condition.
	closed, or when the printer exits Sleep mode until the	●	Pressurizes the pressure roller in the fuser
	printer is ready for printing.
		●	Detects the toner cartridge
		●	Rotates and stops each motor
		●	Rotates and stops each fan
Standby	From the end of the waiting sequence, the last	●	Is in the Ready state
	rotation until the formatter receives a print command,	●	Enters Sleep mode if the formatter sends the
	or until the printer is turned off.
			sleep command
Initial rotation	From the time the formatter receives a print command	●	Activates the high-voltage power supply
	until the paper enters the paper path.	●	Prepares the laser/scanner unit
		●	Warms the fuser to the correct temperature
Printing	From the time the first sheet of paper enters the paper	●	Forms the image on the photosensitive drum
	path until the last sheet has passed through the fuser.	●	Transfers the toner to the paper
		●	Fuses the toner image onto the paper
Last rotation	From the time the last sheet of paper exits the fuser	●	Moves the last printed sheet into the output bin
	until the motors stop rotating.	●	Stops each motor
		●	Stops each fan
		●	Stops the high-voltage power supply
		●	Stops the laser/scanner unit
		●	Turns the fuser heater off
		●	If another print command is received, the printer
			enters the initial rotation period when the last
			rotation is complete.

4 Chapter 1 Theory of operation

ENWW

Formatter-control system

The formatter performs the following functions:

●Controlling sleep mode

●Receiving and processing print data from the various printer interfaces

●Monitoring control panel functions and relaying printer status information (through the control panel and the network or bi-directional interface)

●Developing and coordinating data placement and timing with the DC controller PCA

●Storing font information

●Communicating with the host computer through the network or the bidirectional interface

The formatter receives a print job from the network or bidirectional interface and separates it into image information and instructions that control the printing process. The DC controller PCA synchronizes the image formation system with the paper input and output systems, and then signals the formatter to send the print image data.

The formatter also provides the electrical interface and mounting locations for the Slim DIMM and the optional hard-disk drive (HDD).

Sleep mode

NOTE: In the General Settings menu (a submenu of the Administration menu), this item is termed Sleep Timer Settings.

This feature conserves power after the printer has been idle for an adjustable period of time. When the printer is in Sleep mode, the printer retains all settings, downloaded fonts, and macros. The default setting is for Sleep mode to be enabled, and the printer enters Sleep mode after a 30-second idle time.

The printer firmware uses a combination of timers and Sleep settings to control when the printer enters a different state as well as what states the printer will enter. The available states are listed below, in descending order, from using the most power to using the least power:

●Active: The printer control panel is fully illuminated. The power button light is illuminated.

●Shallow suspend: The printer control panel is dim and the content is grayed out, but is still readable. The power button light is illuminated.

●Suspend: The printer control panel is off (blacked out). The power button light blinks once every three seconds.

●Deep suspend: The printer control panel is off (blacked out). The power button light blinks once every three seconds. The control panel and power button appearance is the same in this state as the suspend state. However, the printer is drawing less than 1 watt of power in the deep suspend state (as opposed to 6 watts of power in the suspend state).

●ff: This state is entered by pressing the power button or removing power from the printer. The power button light is not illuminated.

ENWW	Formatter-control system 5

The printer exits Sleep mode and enters the warm-up cycle when any of the following events occur:

●The printer receives a print job, valid data, or a PML or PJL command.

●A control-panel button is pressed or the touchscreen is touched.

●A cover or door is opened.

●The engine-test switch is pressed.

●A paper tray, other than Tray 1, is opened.

NOTE: If the printer is in the deep suspend state, opening a paper tray will not cause the printer to exit Sleep mode.

NOTE: Printer error messages override the Sleep message. The printer enters Sleep mode at the appropriate time, but the error message continues to appear.

Printer job language (PJL)

PJL is an integral part of printer configuration, in addition to the standard printer command language (PCL) and PostScript (PS). With standard cabling, the printer can use PJL to perform a variety of functions, such as these:

●Two-way communication with the host computer through a network connection or a USB device port: The printer can inform the host about the control-panel settings, and the control-panel settings can be changed from the host.

●Dynamic I/O switching: The printer uses this switching to be configured with a host on each I/O. The printer can receive data from more than one I/O simultaneously, until the I/O buffer is full. This can occur

even when the printer is o ine.

●Context-sensitive switching: The printer can automatically recognize the personality (PS or PCL) of each job and configure itself to serve that personality.

●Isolation of print environment settings from one print job to the next: For example, if a print job is sent to the printer in landscape mode, the subsequent print jobs print in landscape only if they are formatted for landscape printing.

Printer management language (PML)

PML allows remote configuration of the printer and status read-back from the printer through the I/O ports.

Control panel

The M604n, M605n, M604dn, M605dn, and M606dn control panel is a 6.85 cm (2.7 in) four-line color display with numeric keypad and additional buttons for navigating control panel menus. The M605x and M606x control panel is a 20.3 cm (8 in) full-color SVGA with capacitive touchscreen and adjustable viewing angle.

The M605x and M606x control panel has a diagnostic mode to allow testing of the touchscreen, Home button, and speaker. The control panel does not require calibration.

All models include an easy-access USB port for walk-up printing and a hardware integration pocket for thirdparty USB devices, such as card readers.

6 Chapter 1 Theory of operation

ENWW

Easy-access USB port

This printer features easy-access USB printing, for quickly printing files without sending them from a computer. The printer accepts standard USB ash drives in the USB port near the control panel. It supports the following types of files

●.pdf

●.prn

●.pcl

●.ps

●.cht

The USB port is disabled by default. Follow the instructions in the printer user guide to enable the USB port and print USB documents.

Wireless

The M605x and M606x contains a wireless card to enable 802.11b/g/n wireless communication.

Near field communication (NFC)

The M605x and M606x printer supports near field communication (NFC) capabilities. NFC enables an easy one-to-one HP wireless direct print connection using a simple device-to-device touch. Mobile device users can quickly connect to the printer and print documents and images from a mobile device, such as a smartphone or tablet, by touching the device to the NFC icon on the bottom of the control panel.

CPU

The formatter incorporates an 800 MHz processor.

Input/output

The printer has three I/O interfaces:

●Hi-Speed USB 2.0

●10/100/1000 Ethernet LAN connection with IPv4 and IPv6

●Easy-access USB printing (no computer required)

Memory

If the printer encounters a problem when managing available memory, a clearable warning message appears on the control panel.

The formatter incorporates different types of memory and storage to store the printer firmware as well as print-job data and user settings.

ENWW	Formatter-control system 7

●512 MB base memory, expandable to 1.0 GB or 1.5 GB by adding DIMM memory modules

●HP Secure High-Performance Hard Disk (HDD; optional)

Firmware

Memory on the formatter or an optional hard-disk drive (HDD) attached to the formatter store the firmware. A remote firmware upgrade process is used to overwrite and upgrade the firmware.

Nonvolatile random access memory (NVRAM)

The printer uses NVRAM to store printer and user configuration settings. The contents of NVRAM are retained when the printer is turned off or disconnected.

Random access memory (RAM)

The formatter has one DIMM slot. All models come with 512 MB base memory installed. Additional memory can be added up to a maximum of 1.5 GB.

The RAM on the formatter contains the page, I/O buffers, and the font storage area. It stores printing and font information received from the host system, and can also serve to temporarily store a full page of print-image data before the data is sent to the print engine.

NOTE: If the printer encounters a problem when managing available memory, a clearable warning message displays on the control panel display.

HP Memory Enhancement technology (MEt)

MEt effectively doubles the amount of standard memory through a variety of fontand data-compression methods.

NOTE: MEt is available only in when printing in printer command language (PCL) mode. It is not functional when printing in PostScript (PS) mode.

8 Chapter 1 Theory of operation

ENWW