HP P1100, P1102 Service Manual

LASERJET PROFESSIONAL P1100

SERIES PRINTER

Service Manual

www.hp.com/support/ljp1100series

HP LaserJet Professional P1100 Printer series

Service Manual

Copyright and License

© 2010 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.

Part number: CE651-90953

Edition 1, 4/2010

Trademark Credits

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

Conventions used in this guide

TIP: Tips provide helpful hints or shortcuts.

NOTE: Notes provide important information to explain a concept or to complete a task.

CAUTION: Cautions indicate procedures that you should follow to avoid losing data or damaging the product.

WARNING! Warnings alert you to specific procedures that you should follow to avoid personal injury, catastrophic loss of data, or extensive damage to the product.

ENWW

iii

iv Conventions used in this guide

ENWW

Table of contents

1 Theory of operation ........................................................................................................................................	1
Basic operation .....................................................................................................................................	2
Major product systems .........................................................................................................	2
Product block diagram .........................................................................................................	2
Sequence of operation .........................................................................................................	3
Normal sequence of operation ............................................................................	3
Formatter-control system .....................................................................................................................	4
Sleep mode ..........................................................................................................................	4
Input/output ..........................................................................................................................	4
CPU .....................................................................................................................................	4
Memory ................................................................................................................................	4
Firmware .............................................................................................................	5
Memory use ........................................................................................................	5
PJL overview .......................................................................................................................	5
LEDM overview ....................................................................................................................	5
ACL overview .......................................................................................................................	5
Control panel .......................................................................................................................	6
Wireless PCA .......................................................................................................................	6
Engine-control system ..........................................................................................................................	7
Motors, fans, clutches, solenoids, switches, and sensors ...................................................	8
DC controller operations ....................................................................................................	11
Fuser-control circuit ...........................................................................................................	12
Fuser failure detection .......................................................................................	13
Fuser temperature control .................................................................................	14
Fuser protective function ...................................................................................	15
Pressure roller cleaning ....................................................................................	15
Low-voltage power supply .................................................................................................	16
Overcurrent/overvoltage protection ...................................................................	17
High-voltage power supply ................................................................................................	18
Laser/scanner system ........................................................................................................	19
Laser failure detection .......................................................................................	20
Image-formation system .....................................................................................................................	21
Electrophotographic process .............................................................................................	21
Image formation process ...................................................................................................	23

ENWW

v

Latent-image formation stage ...........................................................................	24
Primary charging ..............................................................................	24
Laser beam exposure .......................................................................	24
Developing stage ..............................................................................................	25
Print cartridge ...................................................................................	25
Transfer stage ...................................................................................................	26
Fusing stage .....................................................................................	27
Cleaning stage ..................................................................................	27
Pickup, feed, and delivery system ......................................................................................................	28
Photo sensors and switches ..............................................................................................	29
Input tray, main-input tray, or priority input slot ..................................................................................	30
Jam detection ....................................................................................................................	30
2 Removal and replacement ...........................................................................................................................	31
Introduction .........................................................................................................................................	32
Removal and replacement strategy ...................................................................................................	32
Electrostatic discharge .......................................................................................................................	33
Required tools ...................................................................................................................................	33
Before performing service ..................................................................................................................	34
After performing service .....................................................................................................................	34
Post-service test .................................................................................................................................	35
Print-quality test .................................................................................................................	35
Parts removal order ............................................................................................................................	36
Pickup roller ........................................................................................................................................	37
Separation pad ...................................................................................................................................	38
Transfer roller .....................................................................................................................................	39
Covers ................................................................................................................................................	40
Input tray or main-input tray ...............................................................................................	40
Output bin tray extension ...................................................................................................	41
Front cover .........................................................................................................................	42
Remove the front cover .....................................................................................	42
Left cover ...........................................................................................................................	43
Remove the left cover .......................................................................................	43
Right cover .........................................................................................................................	46
Remove the right cover .....................................................................................	46
Cartridge door ....................................................................................................................	48
Remove the cartridge door ................................................................................	48
Face-down cover ...............................................................................................................	50
Remove the face-down cover ...........................................................................	50
Rear cover .........................................................................................................................	52
Remove the rear cover ......................................................................................	52
Main assemblies .................................................................................................................................	54
Formatter PCA ...................................................................................................................	54

vi

ENWW

Remove the formatter PCA ...............................................................................	55
Wireless PCA .....................................................................................................................	57
Remove the wireless PCA ................................................................................	57
Laser/scanner assembly ....................................................................................................	58
Remove the laser/scanner assembly ................................................................	58
Reinstall the laser/scanner assembly ................................................................	60
Pickup assembly ................................................................................................................	61
Remove the pickup assembly ...........................................................................	61
Reinstall the pickup assembly ...........................................................................	65
Fuser ..................................................................................................................................	67
Remove the fuser ..............................................................................................	67
Reinstall the fuser .............................................................................................	71
Main motor .........................................................................................................................	72
Remove the main motor ....................................................................................	72
Reinstall the main-motor drive belt ....................................................................	76
Pickup solenoid ..................................................................................................................	77
Remove the pickup solenoid .............................................................................	77
Engine controller PCA .......................................................................................................	80
Remove the engine controller PCA ...................................................................	80
Reinstall the engine controller PCA ..................................................................	84
3 Solve problems .............................................................................................................................................	87
Solve problems checklist ....................................................................................................................	88
Troubleshooting process ....................................................................................................................	91
Determine the problem source .........................................................................................	91
Power subsystem ..............................................................................................................	92
Power-on checks ...............................................................................................	92
Tools for troubleshooting ....................................................................................................................	93
Individual component diagnostics ......................................................................................	93
Engine diagnostics ............................................................................................	93
Engine-test button ............................................................................	93
Components tests .............................................................................................	94
Drum rotation functional check ........................................................	94
Half self-test functional check ...........................................................	94
Diagrams ...........................................................................................................................	95
Plug/jack locations ............................................................................................	95
Location of connectors ......................................................................................	96
Locations of major components ........................................................................	97
General timing charts ........................................................................................	99
General circuit diagram ...................................................................................	100
Internal print-quality test pages ........................................................................................	102
Cleaning page .................................................................................................	102
Configuration page ..........................................................................................	102

ENWW

vii

Print-quality troubleshooting tools ....................................................................................	103
Repetitive defect ruler .....................................................................................	103
Interpret control-panel light patterns ................................................................................	103
Clear jams ........................................................................................................................................	107
Common causes of jams .................................................................................................	107
Jam locations ...................................................................................................................	108
Clear jams from the input tray ..........................................................................................	109
Clear jams from the output areas ....................................................................................	111
Clear jams from inside the product ..................................................................................	113
Solve repeated jams ........................................................................................................	114
Change jam recovery ......................................................................................................	114
Solve paper-handling problems ........................................................................................................	116
Solve image-quality problems ..........................................................................................................	117
Image defect table ...........................................................................................................	117
Light print or faded ..........................................................................................	117
Toner specks ...................................................................................................	117
Dropouts ..........................................................................................................	118
Vertical lines ....................................................................................................	118
Gray background .............................................................................................	118
Toner smear ....................................................................................................	118
Loose toner .....................................................................................................	119
Vertical repetitive defects ................................................................................	119
Misformed characters ......................................................................................	119
Page skew .......................................................................................................	119
Curl or wave ....................................................................................................	120
Wrinkles or creases .........................................................................................	120
Toner scatter outline .......................................................................................	120
Moisture ..........................................................................................................	121
Optimize and improve image quality ................................................................................	122
Change print density .......................................................................................	122
Clean the product .............................................................................................................................	123
Clean the pickup roller .....................................................................................................	123
Clean the paper path .......................................................................................................	124
Clean the print-cartridge area ..........................................................................................	126
Clean the exterior ............................................................................................................	128
Solve performance problems ...........................................................................................................	129
Solve connectivity problems .............................................................................................................	130
Solve direct-connect problems ........................................................................................	130
Solve wireless problems ..................................................................................................	130
Service mode functions ....................................................................................................................	132
Product resets ..................................................................................................................	132
Product updates ...............................................................................................................................	133

viii

ENWW

4 Parts and diagrams .....................................................................................................................................	135
Order parts by authorized service providers ....................................................................................	136
Order parts, accessories, and supplies ...........................................................................	136
Related documentation and software ..............................................................................	136
Supplies part numbers .....................................................................................................	136
Customer self repair parts ...............................................................................................	137
Service parts ....................................................................................................................	137
Whole-unit replacement part numbers .............................................................................	137
How to use the parts lists and diagrams ..........................................................................................	138
Assembly locations ...........................................................................................................................	139
Base product ....................................................................................................................	139
Covers ..............................................................................................................................................	140
Base model ......................................................................................................................	140
Wireless model ................................................................................................................	142
Internal assemblies ..........................................................................................................................	144
Internal assemblies (1 of 3) .............................................................................................	144
Internal assemblies (2 of 3) .............................................................................................	146
Internal assemblies (3 of 3) .............................................................................................	148
PCAs ................................................................................................................................................	150
Alphabetical parts list .......................................................................................................................	152
Numerical parts list ...........................................................................................................................	155
Appendix A Service and support .................................................................................................................	159
Hewlett-Packard limited warranty statement ....................................................................................	160
HP's Premium Protection Warranty: LaserJet print cartridge limited warranty statement ................	161
End User License Agreement ..........................................................................................................	162
Customer self-repair warranty service ..............................................................................................	164
Customer support .............................................................................................................................	164
Repack the product ..........................................................................................................................	165
Service information form ..................................................................................................................	166
Appendix B Specifications ............................................................................................................................	167
Physical specifications .....................................................................................................................	168
Power consumption ..........................................................................................................................	168
Acoustic specifications .....................................................................................................................	168
Environmental specifications ............................................................................................................	169
Appendix C Regulatory information ............................................................................................................	171
FCC regulations ...............................................................................................................................	172
Declaration of conformity (base models) ..........................................................................................	173
Declaration of conformity (wireless models) .....................................................................................	174
Certificate of Volatility .......................................................................................................................	175
Safety statements .............................................................................................................................	177

ENWW

ix

Laser safety .....................................................................................................................	177
Canadian DOC regulations ..............................................................................................	177
VCCI statement (Japan) ..................................................................................................	177
Power cord instructions ...................................................................................................	177
Power cord statement (Japan) .........................................................................................	177
EMC statement (Korea) ...................................................................................................	177
Laser statement for Finland .............................................................................................	178
GS statement (Germany) .................................................................................................	178
Substances Table (China) ...............................................................................................	179
Additional statements for wireless products .....................................................................................	180
FCC compliance statement—United States ....................................................................	180
Australia statement ..........................................................................................................	180
Brazil ANATEL statement ................................................................................................	180
Canadian statements .......................................................................................................	180
European Union regulatory notice ...................................................................................	180
Notice for use in France ...................................................................................................	181
Notice for use in Russia ...................................................................................................	181
Korean statement ............................................................................................................	181
Taiwan statement ............................................................................................................	181
Index .................................................................................................................................................................	183

x

ENWW

List of tables

Table 1-1 Sequence of operation .......................................................................................................................		3
Table 1-2	Motors ................................................................................................................................................	8
Table 1-3 Solenoids and clutches ......................................................................................................................		9
Table 1-4	Switches .............................................................................................................................................	9
Table 1-5	Sensors ............................................................................................................................................	10
Table 1-6 DC controller controlled components ...............................................................................................		11
Table 1-7 Photo sensors, motor, and solenoid ................................................................................................		29
Table 3-1 Basic problem solving ......................................................................................................................		88
Table 3-2	Status-light legend .........................................................................................................................	103
Table 3-3 Control-panel light patterns ............................................................................................................		104
Table 4-1 Order parts, accessories, and supplies ..........................................................................................		136
Table 4-2 Related documentation and software ............................................................................................		136
Table 4-3 Supplies part numbers ...................................................................................................................		136
Table 4-4 Customer replaceable units (CRU) kit part numbers .....................................................................		137
Table 4-5 Whole-unit replacement part numbers ...........................................................................................		137
Table 4-6	Base product ..................................................................................................................................	139
Table 4-7	Base model ....................................................................................................................................	141
Table 4-8	Wireless model ...............................................................................................................................	143
Table 4-9 Internal assemblies (1 of 3) ............................................................................................................		145
Table 4-10 Internal assemblies (2 of 3) ..........................................................................................................		147
Table 4-11 Internal assemblies (3 of 3) ..........................................................................................................		149
Table 4-12	PCAs ............................................................................................................................................	151
Table 4-13 Alphabetical parts list ...................................................................................................................		152
Table 4-14 Numerical parts list .......................................................................................................................		155
Table B-1	Physical specifications1 ..................................................................................................................	168
Table B-2 HP LaserJet Professional P1100 Printer series (average in watts)123 ...........................................		168
Table B-3 HP LaserJet Professional P1100 Printer series12 ..........................................................................		168
Table B-4	Environmental specifications .........................................................................................................	169

ENWW

xi

xii

ENWW

List of figures

Figure 1-1 Product block diagram ......................................................................................................................		2
Figure 1-2	Engine-control system ......................................................................................................................	7
Figure 1-3	Motors ...............................................................................................................................................	8
Figure 1-4 Solenoids and clutches .....................................................................................................................		9
Figure 1-5	Switches ...........................................................................................................................................	9
Figure 1-6	Sensors ...........................................................................................................................................	10
Figure 1-7 DC controller block diagram ............................................................................................................		11
Figure 1-8 Fuser control circuit .........................................................................................................................		12
Figure 1-9 Fuser-heater control circuit .............................................................................................................		14
Figure 1-10 Low-voltage power supply (LVPS) ................................................................................................		16
Figure 1-11 High-voltage power supply ............................................................................................................		18
Figure 1-12	Laser/scanner system ...................................................................................................................	19
Figure 1-13 Electrophotographic process block diagram (1 of 2) ....................................................................		21
Figure 1-14 Electrophotographic process block diagram (2 of 2) ....................................................................		22
Figure 1-15 Image formation process ..............................................................................................................		23
Figure 1-16	Primary charging ...........................................................................................................................	24
Figure 1-17 Laser beam exposure ...................................................................................................................		24
Figure 1-18	Print cartridge ................................................................................................................................	25
Figure 1-19	Transfer .........................................................................................................................................	26
Figure 1-20	Separation .....................................................................................................................................	26
Figure 1-21	Fusing ...........................................................................................................................................	27
Figure 1-22	Drum cleaning ...............................................................................................................................	27
Figure 1-23 Pickup, feed, and delivery system block diagram .........................................................................		28
Figure 1-24 Photo sensors, motor, and solenoid .............................................................................................		29
Figure 2-1 Phillips and pozidrive screwdriver comparison ...............................................................................		33
Figure 2-2 Parts removal order ........................................................................................................................		36
Figure 2-3 Remove the pickup roller (1 of 2) ....................................................................................................		37
Figure 2-4 Remove the pickup roller (2 of 2) ....................................................................................................		37
Figure 2-5 Remove the separation pad assembly ...........................................................................................		38
Figure 2-6 Remove the transfer roller ..............................................................................................................		39
Figure 2-7 Remove the tray ..............................................................................................................................		40
Figure 2-8 Remove the output bin tray extension ............................................................................................		41
Figure 2-9 Remove the front cover ..................................................................................................................		42
Figure 2-10 Remove the left cover (1 of 5) .......................................................................................................		43

ENWW

xiii

Figure 2-11 Remove the left cover (2 of 5) .......................................................................................................	44
Figure 2-12 Remove the left cover (3 of 5) .......................................................................................................	44
Figure 2-13 Remove the left cover (4 of 5) .......................................................................................................	45
Figure 2-14 Remove the left cover (5 of 5) .......................................................................................................	45
Figure 2-15 Remove the right cover (1 of 3) ....................................................................................................	46
Figure 2-16 Remove the right cover (2 of 3) ....................................................................................................	46
Figure 2-17 Remove the right cover (3 of 3) ....................................................................................................	47
Figure 2-18 Remove the cartridge door (1 of 2) ...............................................................................................	48
Figure 2-19 Remove the cartridge door (2 of 2) ...............................................................................................	49
Figure 2-20 Remove the face-down cover (1 of 2) ...........................................................................................	50
Figure 2-21 Remove the face-down cover (2 of 2) ...........................................................................................	51
Figure 2-22 Remove the rear cover (1 of 2) .....................................................................................................	52
Figure 2-23 Remove the rear cover (2 of 2) .....................................................................................................	53
Figure 2-24 Remove the formatter PCA (HP LaserJet Professional P1100 Printer series; 1 of 4) ..................	55
Figure 2-25 Remove the formatter PCA (HP LaserJet Professional P1100w Printer series; 2 of 4) ...............	55
Figure 2-26 Remove the formatter PCA (HP LaserJet Professional P1100 Printer series; 3 of 4) ..................	56
Figure 2-27 Remove the formatter PCA (HP LaserJet Professional P1100w Printer series; 4 of 4) ...............	56
Figure 2-28 Remove the wireless PCA ............................................................................................................	57
Figure 2-29 Remove the laser/scanner assembly (1 of 4) ...............................................................................	58
Figure 2-30 Remove the laser/scanner assembly (2 of 4) ...............................................................................	59
Figure 2-31 Remove the laser/scanner assembly (3 of 4) ...............................................................................	59
Figure 2-32 Remove the laser/scanner assembly (4 of 4) ...............................................................................	60
Figure 2-33 Reinstall the laser/scanner assembly ...........................................................................................	60
Figure 2-34 Remove the pickup assembly (1 of 7) ...........................................................................................	61
Figure 2-35 Remove the pickup assembly (2 of 7) ...........................................................................................	62
Figure 2-36 Remove the pickup assembly (3 of 7) ...........................................................................................	62
Figure 2-37 Remove the pickup assembly (4 of 7) ...........................................................................................	63
Figure 2-38 Remove the pickup assembly (5 of 7) ...........................................................................................	63
Figure 2-39 Remove the pickup assembly (6 of 7) ...........................................................................................	64
Figure 2-40 Remove the pickup assembly (7 of 7) ...........................................................................................	64
Figure 2-41 Reinstall the pickup assembly (1 of 4; correct ground spring position) .........................................	65
Figure 2-42 Reinstall the pickup assembly (2 of 4; incorrect ground spring position) ......................................	65
Figure 2-43 Reinstall the pickup assembly (3 of 4; lift plate in raised position) ................................................	66
Figure 2-44 Reinstall the pickup assembly (4 of 4; lift plate in lowered position) .............................................	66
Figure 2-45 Remove the fuser (1 of 7) .............................................................................................................	67
Figure 2-46 Remove the fuser (2 of 7) .............................................................................................................	68
Figure 2-47 Remove the fuser (3 of 7) .............................................................................................................	68
Figure 2-48 Remove the fuser (4 of 7) .............................................................................................................	69
Figure 2-49 Remove the fuser (5 of 7) .............................................................................................................	69
Figure 2-50 Remove the fuser (6 of 7) .............................................................................................................	70
Figure 2-51 Remove the fuser (7 of 7) .............................................................................................................	70
Figure 2-52 Reinstall the fuser; correct wire harness installation .....................................................................	71
Figure 2-53 Reinstall the fuser; incorrect wire harness installation ..................................................................	71
Figure 2-54 Remove the main motor (1 of 7) ...................................................................................................	72

xiv

ENWW

Figure 2-55 Remove the main motor (2 of 7) ...................................................................................................		73
Figure 2-56 Remove the main motor (3 of 7) ...................................................................................................		73
Figure 2-57 Remove the main motor (4 of 7) ...................................................................................................		74
Figure 2-58 Remove the main motor (5 of 7) ...................................................................................................		74
Figure 2-59 Remove the main motor (6 of 7) ...................................................................................................		75
Figure 2-60 Remove the main motor (7 of 7) ...................................................................................................		75
Figure 2-61 Main-motor drive belt: correctly installed ......................................................................................		76
Figure 2-62 Main-motor drive belt: incorrectly installed ....................................................................................		76
Figure 2-63 Remove the pickup solenoid (1 of 5) ............................................................................................		77
Figure 2-64 Remove the pickup solenoid (2 of 5) ............................................................................................		78
Figure 2-65 Remove the pickup solenoid (3 of 5) ............................................................................................		78
Figure 2-66 Remove the pickup solenoid (4 of 5) ............................................................................................		79
Figure 2-67 Remove the pickup solenoid (5 of 5) ............................................................................................		79
Figure 2-68 Remove the engine controller PCA (1 of 8) ..................................................................................		80
Figure 2-69 Remove the engine controller PCA (2 of 8) ..................................................................................		81
Figure 2-70 Remove the engine controller PCA (3 of 8) ..................................................................................		81
Figure 2-71 Remove the engine controller PCA (4 of 8) ..................................................................................		82
Figure 2-72 Remove the engine controller PCA (5 of 8) ..................................................................................		82
Figure 2-73 Remove the engine controller PCA (6 of 8) ..................................................................................		83
Figure 2-74 Remove the engine controller PCA (7 of 8) ..................................................................................		83
Figure 2-75 Remove the engine controller PCA (8 of 8) ..................................................................................		84
Figure 2-76 Reinstall the engine controller PCA (1 of 4) ..................................................................................		84
Figure 2-77 Reinstall the engine controller PCA (2 of 4) ..................................................................................		85
Figure 2-78 Reinstall the engine controller PCA (3 of 4) ..................................................................................		85
Figure 2-79 Reinstall the engine controller PCA (4 of 4) ..................................................................................		86
Figure 3-1 Sample engine test page ................................................................................................................		93
Figure 3-2	Plug/jack locations ..........................................................................................................................	95
Figure 3-3 Engine controller PCA connectors ..................................................................................................		96
Figure 3-4	External view ...................................................................................................................................	97
Figure 3-5 Cross section view ..........................................................................................................................		98
Figure 3-6 General timing diagram ...................................................................................................................		99
Figure 3-7 Circuit diagram; HP LaserJet Professional P1100 Printer series .................................................		100
Figure 3-8 Circuit diagram; HP LaserJet Professional P1100w Printer series ...............................................		101
Figure 4-1	Base product ................................................................................................................................	139
Figure 4-2	Base model ...................................................................................................................................	140
Figure 4-3	Wireless model .............................................................................................................................	142
Figure 4-4 Internal assemblies (1 of 3) ...........................................................................................................		144
Figure 4-5 Internal assemblies (2 of 3) ...........................................................................................................		146
Figure 4-6 Internal assemblies (3 of 3) ...........................................................................................................		148
Figure 4-7	PCAs .............................................................................................................................................	150

ENWW

xv

xvi

ENWW

1 Theory of operation

●Basic operation

●Formatter-control system

●Engine-control system

●Image-formation system

●Pickup, feed, and delivery system

●Input tray, main-input tray, or priority input slot

ENWW

1

Basic operation

Major product systems

The product contains the following major systems:

●Engine-control system

●Laser/scanner system

●Image-formation system

●Pickup-and-feed system

Product block diagram

Figure 1-1 Product block diagram

LASER/SCANNER SYSTEM

ENGINE CONTROL	IMAGE-FORMATION SYSTEM
SYSTEM

PICKUP-AND-FEED SYSTEM

2 Chapter 1 Theory of operation

ENWW

Sequence of operation

The DC controller in the engine-control system controls the operational sequences of the product. The table below describes durations and operations for each period of a print operation from when the prroduct is turned on until the motor stops rotating.

Normal sequence of operation

Table 1-1 Sequence of operation

Name	Timing	Purpose
WAIT	From the time the power switch is turned on, the door	Brings the product to the ready state. The product
	is closed or the product exits Sleep mode until the	performs the following during the operations:
	product gets ready for a print operation.	● Detects the print cartridge
		● Heats the fuser film in the fuser
		● Rotates, and then stops, the main motor

STBY (standby) From the end of the WAIT or LSTR period until either a print command is sent or the power switch is turned off.

Maintains the product in printable condition. The product performs the following during the operation:

●Enters Auto-Off mode if the Auto-Off command is received

INTR (initial	From the time a print command is received until the
rotation)	paper is picked up.

The product performs the following during the operations:

●Drives the main motor

●Activates the high-voltage power supply

●Activates the laser/scanner

●Warms the fuser heater

PRINT	From the end of the INTR period until the last sheet
	completes the fuser operation.

Forms the image on the photosensitive drum based on the VIDEO signals from the formatter. Transfers and fuses the toner image to the paper.

LSTR (last	From the end of the PRINT period until the main motor
rotation)	stops rotating.

Moves the last printed sheet out of the product. The product performs the following during the operations:

●Stops the main motor

●Deactivates the high-voltage power supply

●Deactivates the laser/scanner

●Deactivates the fuser heater

The product enters the INTR period as the LSTR period is completed, if the formatter sends another print command.

ENWW	Basic operation 3

Formatter-control system

The formatter is responsible for the following procedures:

●Controlling sleep mode

●Receiving and processing print data from the various product interfaces

●Monitoring control-panel functions and relaying product-status information (through the control panel and the network or bidirectional 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.

Sleep mode

NOTE: This product uses an Auto-Off feature for sleep mode.

After a user-specified time, the Auto-Off feature automatically conserves electricity by substantially reducing power consumption when the product is not printing. After a user-specified time, the product automatically reduces its power consumption (Auto-Off). The product returns to the ready state when a button is pressed, a print job is received, or a door is opened. When the product is in Auto-Off mode, the control-panel LEDs and the power button backlight LED are off.

NOTE: Although the product lights are off in Auto-Off mode, the product functions normally when it receives a print job.

Input/output

The product receives print data primarily from the following:

●Hi-Speed USB 2.0 port

●802.11b/g wireless networking (wireless models only)

CPU

The formatter incorporates a 400 MHz Helium processor.

Memory

The random access memory (RAM) on the formatter PCA contains the page, I/O buffers, and the font storage area. RAM 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.

4 Chapter 1 Theory of operation

ENWW

Firmware

●HP LaserJet Professional P1100 Printer series

◦The product has 2 MB of Synchronous DRAM, which is used for run-time firmware imaging and specific print job information for the print job.

●HP LaserJet Professional P1100w Printer series

◦The product has 8 MB of Synchronous DRAM, which is used for run-time firmware imaging and specific print job information for the print job.

Memory use

●HP LaserJet Professional P1100 Printer series

◦The product has a 2 KB EEPROM and 64 MB of NAND Flash Memory, which is used for product configuration information and printer driver firmware.

●HP LaserJet Professional P1100w Printer series

◦The product has a 8 KB EEPROM and 64 MB of NAND Flash Memory, which is used for product configuration information and printer driver firmware.

PJL overview

The printer job language (PJL) is an integral part of configuration, in addition to the standard printer command language (PCL). With standard cabling, the product 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 connection. The product can inform the host about such things as the control-panel settings, and the control-panel settings can be changed from the host.

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

●Context-sensitive switching. The product 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 product in landscape mode, the subsequent print jobs print in landscape mode only if they are formatted for landscape printing.

LEDM overview

NOTE: HP LaserJet Professional P1100w Printer series

The low-end data model (LEDM) provides one consistent data representation method and defines the dynamic and capabilities tickets shared between clients and devices, as well as the access protocol, event, security, and discovery methods.

ACL overview

The advanced control language (ACL) is a language that supports product control and firmware downloads in products that support both PJL/PCL and host-based printing. Each sequence of ACL

ENWW	Formatter-control system 5

commands must be preceded by a unified exit command (UEL) and an @PJL ENTER LANGUAGE=ACL command. The ACL sequence is always followed by a UEL. Any number of commands can be placed between the UELs. The only exception to these rules is the download command. If a firmware download is done, the download command must be the last command in the sequence. It will not be followed by a UEL.

The firmware searches for the UEL sequence when parsing commands. However, while downloading binary data such as host-based code or NVRAM data the firmware suspends UEL parsing. To handle hosts that “disappear” during binary sequences, the firmware times out all ACL command sessions. If a timeout occurs during a non-download command sequence, it is treated as the receipt of a UEL. If a timeout occurs during firmware download the product resets.

Control panel

The formatter sends and receives product status and command data to and from the control-panel PCA.

Wireless PCA

NOTE: Wireless models only.

The wireless PCA controls the wireless function of the product

6 Chapter 1 Theory of operation

ENWW

Engine-control system

The engine-control system coordinates all product functions, according to commands that the formatter sends. The engine-control system drives the laser/scanner system, the image-formation system, and the pickup/feed/delivery system.

The engine control system contains the following major components:

●Engine-control unit (ECU)

◦DC controller

◦Low-voltage power supply

●High-voltage power supply

●Fuser control

Figure 1-2 Engine-control system

ENGINE CONTROL SYSTEM

DC controller

Low-voltage power supply

LASER/SCANNER SYSTEM

Formatter

IMAGE-FORMATION SYSTEM

High-voltage power supply

MEDIA-FEED SYSTEM

Fuser control

ENWW	Engine-control system 7

Motors, fans, clutches, solenoids, switches, and sensors

Figure 1-3 Motors

M1

M2

Table 1-2 Motors

Description	Components driven
Main motor (M1)	●	Pickup roller
	●	Feed roller
	●	Photosensitive drum
	●	Developing roller
	●	Pressure roller
	●	Delivery roller
Scanner motor (M2)	●	Scanner mirror

8 Chapter 1 Theory of operation

ENWW

Figure 1-4 Solenoids and clutches

SL1

Table 1-3 Solenoids and clutches

Item	Description
SL1	Pickup solenoid

Figure 1-5 Switches

Table 1-4 Switches

Item	Description
SW501	Cartridge-door switch
SW502	Power switch; not shown

ENWW	Engine-control system 9

Figure 1-6	Sensors
	PS702
	PS701
	Single-sheet-feed slot
	(HP LJP P1100w printer Series)
	PS751
Table 1-5 Sensors
Item	Description
PS701	Fuser delivery sensor
PS702	Media width sensor
PS751	Top-of-Page (TOP) sensor
PS901	Main-motor rotation-number sensor; not shown

10 Chapter 1 Theory of operation

ENWW

DC controller operations

The DC controller controls the operational sequences of the product systems.

Figure 1-7 DC controller block diagram

		Engine controller
AC input
	Low-voltage	Motor
	power supply
Fuser unit
		Solenoid
Transfer roller		Photointerrupter
		DC controller
Cartridge	High-voltage
	power supply
		Switch

Laser scanner

Formatter

Operation panel

Table 1-6 DC controller controlled components

Component	Designator	Description
Motor	M1	Main motor
	M2	Scanner motor
Solenoid	SL1	Pickup solenoid
Photointerrupter	PS701	Fuser delivery sensor
	PS702	Media width sensor
	PS751	Top-of-Page (TOP) sensor
	PS901	Main-motor rotation-number sensor

ENWW	Engine-control system 11

Table 1-6 DC controller controlled components (continued)

Component	Designator	Description
Switch	SW501	Cartridge-door switch
	SW502	Power switch

Fuser-control circuit

The fuser-control circuit monitors and controls the temperature in the fuser. The product uses ondemand fusing. The fuser-control circuit consists of the following major components:

●Fuser heater (H1); heats the fusing film

●Thermistor (TH1); detects the fuser temperature (contact type)

●Thermal fuse (FU1); prevents abnormal temperature rise in the fuser (contact type)

Figure 1-8 Fuser control circuit

Fuser film

TH1

FU1

Pressure roller

H1

FUSER TEMPERATURE signal

FUSER HEATER CONTROL signal

Fuser heater control	Fuser heater safety
circuit	circuit
Fuser control	DC controller
	Engine controller

12 Chapter 1 Theory of operation

ENWW