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
Trademark Credits
© 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
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
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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 specifications
Table B-2 HP LaserJet Professional P1100 Printer series (average in watts)
Table B-3 HP LaserJet Professional P1100 Printer series
Table B-4 Environmental specifications ......................................................................................................... 169
1
.................................................................................................................. 168
123
........................................... 168
12
.......................................................................... 168
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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
SYSTEM
IMAGE-FORMATION 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
STBY (standby) From the end of the WAIT or LSTR period until either
INTR (initial
rotation)
PRINT From the end of the INTR period until the last sheet
LSTR (last
rotation)
is closed or the product exits Sleep mode until the
product gets ready for a print operation.
a print command is sent or the power switch is turned
off.
From the time a print command is received until the
paper is picked up.
completes the fuser operation.
From the end of the PRINT period until the main motor
stops rotating.
Brings the product to the ready state. The product
performs the following during the operations:
Detects the print cartridge
●
Heats the fuser film in the fuser
●
Rotates, and then stops, the main motor
●
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
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
●
Forms the image on the photosensitive drum based
on the VIDEO signals from the formatter. Transfers
and fuses the toner image to the paper.
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
●
◦
HP LaserJet Professional P1100w Printer series
●
◦
Memory use
HP LaserJet Professional P1100 Printer series
●
◦
HP LaserJet Professional P1100w Printer series
●
◦
PJL overview
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.
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.
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.
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.
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
LASER/SCANNER SYSTEM
Formatter
Low-voltage power supply
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)
Scanner motor (M2)
Pickup roller
●
Feed roller
●
Photosensitive drum
●
Developing roller
●
Pressure roller
●
Delivery roller
●
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
PS751
Table 1-5 Sensors
Single-sheet-feed slot
(HP LJP P1100w printer Series)
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
AC input
Engine controller
Fuser unit
Transfer roller
Cartridge
Formatter
Low-voltage
power supply
High-voltage
power supply
Motor
Solenoid
Photointerrupter
DC controller
Switch
Laser scanner
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
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
SW502 Power switch
Fuser film
TH1
FU1
H1
FUSER HEATER CONTROL signal
Fuser heater control
circuit
Fuser control
Pressure roller
FUSER TEMPERATURE signal
Fuser heater safety
circuit
DC controller
Engine controller
12 Chapter 1 Theory of operation ENWW
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