HP LaserJet M1120 MFP Series Service Manual
HP LaserJet M1120 MFP Series Service Manual
Copyright and License Trademark Credits © 2008 Copyright Hewlett-Packard Development Company, L.P. Adobe®, Acrobat®, and PostScript® are trademarks of Adobe Systems Incorporated. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Microsoft®, Windows®, and Windows NT® are U.S. registered trademarks of Microsoft Corporation. The information contained herein is subject to change without notice.
Table of contents 1 Product information Quick access to product information .................................................................................................... 2 Product comparison ............................................................................................................................. 3 Product features ................................................................................................................................... 4 Product walkaround ...............
Install the print cartridge .................................................................................................... 21 3 Maintenance Manage supplies ................................................................................................................................ 24 Life expectancies of supplies ............................................................................................. 24 Check and order supplies ..................................................................
Control-panel assembly ..................................................................................................... 58 Scanner assembly ............................................................................................................. 60 Product base ...................................................................................................................................... 65 Print cartridge .......................................................................................
Image problems ............................................................................................................... 127 Media-handling problems ................................................................................................ 128 Performance problems .................................................................................................... 130 Functional checks ................................................................................................................
External covers and panels .............................................................................................................. 168 Internal components (1 of 3) ............................................................................................................ 170 Internal components (2 of 3) ............................................................................................................ 172 Internal components (3 of 3) .........................................................
Laser statement for Finland ............................................................................................. 196 Substances table (China) ................................................................................................ 196 Index .................................................................................................................................................................
List of tables Table 1-1 Table 1-2 Table 1-3 Table 1-4 Table 4-1 Table 4-2 Table 6-1 Table 6-2 Table 6-3 Table 6-4 Table 6-5 Table 6-6 Table 6-7 Table 6-8 Table 7-1 Table 7-2 Table 7-3 Table 7-4 Table 7-5 Table 7-6 Table 7-7 Table 7-8 Table 7-9 Table 7-10 Table 7-11 Table 7-12 Table 7-13 Table B-1 Table B-2 Table B-3 Table B-4 Table B-5 Table C-1 ENWW Product guides ...................................................................................................................................
x ENWW
List of figures Figure 4-1 Figure 4-2 Figure 4-3 Figure 4-4 Figure 4-5 Figure 4-6 Figure 4-7 Figure 4-8 Figure 4-9 Figure 4-10 Figure 4-11 Figure 4-12 Figure 4-13 Figure 4-14 Figure 4-15 Figure 5-1 Figure 5-2 Figure 5-3 Figure 5-4 Figure 5-5 Figure 5-6 Figure 5-7 Figure 5-8 Figure 5-9 Figure 5-10 Figure 5-11 Figure 5-12 Figure 5-13 Figure 5-14 Figure 5-15 Figure 5-16 Figure 5-17 Figure 5-18 Figure 5-19 Figure 5-20 Figure 5-21 Figure 5-22 Figure 5-23 Figure 5-24 ENWW System block diagram .................
Figure 5-25 Figure 5-26 Figure 5-27 Figure 5-28 Figure 5-29 Figure 5-30 Figure 5-31 Figure 5-32 Figure 5-33 Figure 5-34 Figure 5-35 Figure 5-36 Figure 5-37 Figure 5-38 Figure 5-39 Figure 5-40 Figure 5-41 Figure 5-42 Figure 5-43 Figure 5-44 Figure 5-45 Figure 5-46 Figure 5-47 Figure 5-48 Figure 5-49 Figure 5-50 Figure 5-51 Figure 5-52 Figure 5-53 Figure 5-54 Figure 5-55 Figure 5-56 Figure 5-57 Figure 5-58 Figure 5-59 Figure 5-60 Figure 5-61 Figure 5-62 Figure 5-63 Figure 5-64 Figure 5-65 Figure 5-66 Figure 5
Figure 5-75 Figure 5-76 Figure 5-77 Figure 5-78 Figure 5-79 Figure 5-80 Figure 5-81 Figure 5-82 Figure 5-83 Figure 5-84 Figure 5-85 Figure 5-86 Figure 5-87 Figure 6-1 Figure 6-2 Figure 6-3 Figure 6-4 Figure 6-5 Figure 6-6 Figure 6-7 Figure 6-8 Figure 6-9 Figure 6-10 Figure 7-1 Figure 7-2 Figure 7-3 Figure 7-4 Figure 7-5 Figure 7-6 ENWW Remove the fuser (2 of 6) ............................................................................................................. 97 Remove the fuser (3 of 6) .......
xiv ENWW
1 ENWW Product information ● Quick access to product information ● Product comparison ● Product features ● Product walkaround ● Software description ● Software for Windows ● Software for Macintosh ● Uninstall software ● Media specifications 1
Quick access to product information Use the following Web site to find information about the product. ● www.hp.com/support/LJM1120 Table 1-1 Product guides Guide Description HP LaserJet M1120 MFP Getting Provides step-by-step instructions for installing and setting up the product. Started Guide 2 HP LaserJet M1120 MFP Series User Guide Provides detailed information for using the product and problem-solving. Available on the product CD or in Program Group if the software is installed on a computer.
Product comparison The product is available in the following configurations. ENWW Base models Network models ● Print letter-size pages at speeds up to 20 pages per minute (ppm) and A4-size pages at speeds up to 19 ppm. Base model, plus: ● Priority input tray holds up to 10 sheets of print media. ● Tray 1 holds up to 250 sheets of print media or 10 envelopes. ● Manual two-sided (duplex) printing and copying. ● Hi-Speed USB 2.0 port. ● 32-megabyte (MB) random-access memory (RAM).
Product features ● Prints letter-size pages at speeds up to 20 ppm and A4-size pages at speeds up to 19 ppm. ● Prints at 600 dots per inch (dpi) and FastRes 1200 dpi. ● Includes adjustable settings to optimize print quality. Copy ● Copies at 300 dots per inch (dpi). Memory ● Includes 32 MB RAM. Paper handling ● Priority input tray holds up to 10 pages. ● Tray 1 holds up to 250 sheets of print media or 10 envelopes. ● Output bin holds up to 100 sheets of print media.
Product walkaround Front view 1 2 3 6 1 Scanner lid 2 Control panel 3 Print-cartridge door latch 4 Output bin 5 Priority input tray 6 Tray 1 5 4 Back view 7 9 ENWW 7 Interface ports 8 Power switch 9 Power connector 8 Product walkaround 5
Interface ports All models have a Hi-Speed USB 2.0 port, and network models also have a 10/100 Base-T Ethernet port. 1 2 1 Hi-Speed USB 2.0 port 2 Ethernet port (network models only) Serial number and model number location The serial number and product model number label is on the rear of the product.
Software description Supported operating systems The product supports the following operating systems: Full software installation Print and scan drivers only ● Windows XP (32-bit) ● Windows XP (64-bit) ● Windows Vista (32-bit) ● Windows Vista (64-bit) ● Windows 2000 ● Windows 2003 Server (64-bit) ● Windows 2003 Server (32-bit) ● Mac OS X v10.3, v10.4, and later NOTE: For Mac OS X v10.4 and later, PPC and Intel Core Processor Macs are supported.
● Shop for HP Supplies program ● Other programs ◦ Readiris OCR (not installed with other software; separate installation is required) Advanced installation Advanced installation includes all of the features that are available with the easy installation. The HP Customer Participation program is optional.
Software for Windows Embedded Web server (network models only) Network models are equipped with an embedded Web server, which provides access to information about device and network activities. This information appears in a Web browser, such as Microsoft Internet Explorer, Netscape Navigator, Apple Safari, or Firefox. The embedded Web server resides on the device. It is not loaded on a network server.
Software for Macintosh Embedded Web server (network models only) Network models are equipped with an embedded Web server, which provides access to information about device and network activities. This information appears in a Web browser, such as Microsoft Internet Explorer, Netscape Navigator, Apple Safari, or Firefox. The embedded Web server resides on the device. It is not loaded on a network server.
Uninstall software Windows 1. Click Start, and then click All Programs. 2. Click HP, and then click HP LaserJet M1120. 3. Click Uninstall, and then follow the onscreen instructions to remove the software. Macintosh To remove the software, drag the PPD files to the trash can.
Media specifications Supported paper and print media sizes This product supports a number of paper sizes, and it adapts to various media. NOTE: To obtain best print results, select the appropriate paper size and type in the print driver before printing. Table 1-2 Supported paper and print media sizes 1 Size Dimensions Letter 216 x 279 mm (8.5 x 11 in) Legal 216 x 356 mm (8.5 x 14 in) A4 210 x 297 mm (8.27 x 11.69 in) Executive 184 x 267 mm (7.24 x 10.51 in) A3 297 x 420 mm (11.69 x 16.
Table 1-3 Supported envelopes and postcards (continued) Size Dimensions Envelope C5 162 x 229 mm (6.93 x 9.84 in) Envelope B5 176 x 250 mm (6.7 x 9.8 in) Envelope Monarch 98 x 191 mm (3.9 x 7.5 in) Postcard 100 x 148 mm (3.94 x 5.83 in) Double postcard 148 x 200 mm (5.83 x 7.87 in) Priority input tray Tray 1 Supported paper types and tray capacity This product has the following tray priority for feeding print media: 1. Priority input tray 2.
14 Chapter 1 Product information ENWW
2 ENWW Installation ● Site preparations ● What was in the box ● Install input devices ● Install supplies 15
Site preparations Operating environment Place the product on a sturdy, level surface in a well-ventilated area. Make sure that the air vents are not blocked and that the product is installed away from direct sunlight, open flames, and ammonia fumes. Store or install the product in an area that meets the following requirements: 16 ● Temperature (printer; operating) 15o to 32.5o C (59o to 90.
Minimum system requirements ENWW ● Windows® 2000 ● Windows XP ● Windows Server 2003 ● Windows Vista ● Mac OS X v10.
What was in the box The following components are included in the box. NOTE: The USB and network cables are not included.
Install input devices Priority input tray The priority input tray is accessed from the front of the product. The product prints from the priority input tray before attempting to print from tray 1. Media guides ensure that the media is correctly fed into the product and that the print is not skewed (crooked on the media). When loading media, adjust the media guides to match the width of the media that you are using.
Tray 1 20 1. Push tray 1 into the product. 2. Open the tray cover, and then adjust the media guides out. 3. Load the paper in the tray, snug the media guides against the stack, and then close the tray cover.
Install supplies Install the print cartridge ENWW 1. Open the print-cartridge door. 2. Remove the new print cartridge from its packaging, and then rock the print cartridge back and forth. 3. Remove the orange cover from the print cartridge, and then pull the orange tab straight out to remove the sealing tape.
22 4. Insert the cartridge into the product until it is firmly in place. 5. Close the print-cartridge door.
3 ENWW Maintenance ● Manage supplies ● Clean the product ● Management tools 23
Manage supplies Inspect any parts that wear when servicing the product. Replace them as needed, based on failure or wear rather than usage. The following table lists approximate schedules for replacing consumables. Life expectancies of supplies Item Capacity HP LaserJet M1120 MFP Series Recommended maximum of 3,000 pages per month Print cartridge 2,000 pages1 (standard) 1 For information about the yield for the cartridges, see www.hp.com/go/pageyield. Actual yield depends on specific use.
Replace supplies Print cartridge ENWW 1. Open the print-cartridge door. 2. Grasp the handle on the print cartridge, and then pull the cartridge straight out to remove it. See the recycling information inside the print cartridge box. 3. Remove the new print cartridge from its packaging, and then rock the print cartridge back and forth.
4. Remove the orange cover from the print cartridge, and then pull the orange tab straight out to remove the sealing tape. 5. Insert the cartridge into the product until it is firmly in place. 6. Close the print-cartridge door. CAUTION: If toner gets on any clothing, wipe it off with a dry cloth and wash the clothing in cold water. Hot water sets toner into the fabric. HP policy on non-HP supplies Hewlett-Packard Company cannot recommend the use of non-HP supplies, either new or remanufactured.
HP fraud hotline Call the HP fraud hotline if the product indicates that the print cartridge is not an HP print cartridge and you think that it is genuine. HP will help determine if the product is genuine and take steps to resolve the problem. The print cartridge might not be a genuine HP one if you notice the following issues: ● You are experiencing a large number of problems with the print cartridge.
Clean the product Clean the exterior Use a soft, damp, lint-free cloth to wipe dust, smudges, and stains off of the exterior of the product. Clean the flatbed scanner glass Dirty glass, from fingerprints, smudges, hair, and so on, slows down performance and affects the accuracy of special features such as fit-to-page and copy. 1. Turn off the product, unplug the power cord from the electrical outlet, and raise the scanner cover. 2.
3. Dry the backing by using a chamois or soft cloth. CAUTION: Do not use paper-based wipes because they might scratch the backing. 4. If this does not clean the backing well enough, repeat the previous steps and use isopropyl alcohol to dampen the cloth or sponge, and then wipe the backing thoroughly with a damp cloth to remove any residual alcohol. Clean the paper path During the printing process, paper, toner, and dust particles can accumulate inside the product.
Management tools Information pages Information pages reside within the product memory. These pages help diagnose and solve problems with the product. NOTE: If the product language was not correctly set during installation, you can set the language manually so the information pages print in one of the supported languages. Change the language by using the System setup menu on the control panel or the embedded Web server (network models only). Page description How to print the page Demo page 1.
Features The EWS allows you to view product and network status and manage printing functions from a computer.
32 Chapter 3 Maintenance ENWW
4 ENWW Operational theory ● Basic operation ● Scanner functions and operation ● Internal components (base unit) ● Engine control system ● Laser/scanner system ● Pickup/feed/delivery system ● Image-formation system 33
Basic operation This chapter presents an overview of the relationships between major components in the product, and includes a detailed discussion of the image-formation system. The following systems are discussed: ● Engine control system ● Laser/scanner system ● Pickup/feed/delivery system ● Image-formation system Figure 4-1 System block diagram Sequence of operation for the base unit Operational sequences are controlled by the microprocessor on the DC controller.
Table 4-1 Sequence of operation (continued) Name Timing Purpose PRINT From the end of the INTR period until the primary high-voltage is turned off Forms the image on the photosensitive drum and transfers the toner image to the media LSTR (last rotation) From the end of the PRINT period (when high-voltage Delivers the last page of a print job is turned off) until the main motor stops rotating After LSTR, the product either returns to STBY or, if another print command was sent from the formatter, enter
Scanner functions and operation The following sections describe how the document scanner functions. Scanner functions The contact image sensor (CIS) is the major component of the optical scanning system. The CIS consists of three LEDs (red, green, and blue), a light guide, the scanning glass, the rod lens array, and a sensor array. When the CIS scans a document, the CIS moves and the paper is stationary. Figure 4-2 Optical system (1 of 2) The formatter controls the CIS.
Figure 4-3 Optical system (2 of 2) Scanner operation At startup and periodically at other times, the scanner assembly moves systematically to locate its home position. It then calibrates to a white strip located under the glass at the right end of the scan tub.
Internal components (base unit) Figure 4-4 Cross-section of printer 1 2 3 5 4 6 12 38 11 10 9 1 Fuser unit 2 Pressure roller 3 Fuser sleeve 4 Delivery roller 5 Laser/scanner unit 6 Single-sheet-feed slot 7 Multi-purpose tray 8 Photosensitive drum 9 Pickup roller 10 Separation pad 11 Feed roller 12 Transfer roller 8 Chapter 4 Operational theory 7 ENWW
Engine control system The engine control system coordinates all of the product functions, according to commands sent from the formatter. It drives the laser/scanner system, the image-formation system, and the pickup/feed/ delivery system.
Figure 4-6 Engine-control-system circuit diagram Engine controller M Fixing unit Motor Fixing control Solenoid AC input Low-voltage power supply DC controller Sensor Transfer roller High-voltage power supply Cartridge Switch Formatter 40 Chapter 4 Operational theory Laser/scanner unit ENWW
Laser/scanner system The laser/scanner system receives video signals from the DC controller and the formatter, and then converts the signals into latent images on the photosensitive drum.
Pickup/feed/delivery system The pickup/feed/delivery system consists of several types of feed rollers and sensors. The DC controller uses two motors and two solenoids to drive the rollers. Three media-detection sensors detect media as it passes through the printer. If media does not reach or pass each sensor within a specified time period, the DC controller determines that a jam has occurred and alerts the formatter.
Image-formation system Laser printing requires the interaction of several technologies, including electronics, optics, and electrophotographics, to produce a printed page. Each process functions independently and must be coordinated with the other product processes.
Step 2: Laser beam exposure The laser beam scans the photosensitive drum to neutralize negative charges on parts of the drum. An electrostatic latent image is formed on the drum where negative charges were neutralized. Step 3: Developing The developing cylinder comes in contact with the photosensitive drum to deposit toner onto the electrostatic latent image. NOTE: The charges on the exposed area of the drum are shown as positive in Figure 4-11 Developing on page 44.
Figure 4-12 Transfer Step 5: Separation The elasticity of the print media causes its separation from the photosensitive drum. A static-charge eliminator aids separation by weakening any electrostatic adhesion. Figure 4-13 Separation Step 6: Fusing The DC negative bias applied to the fusing film strengthens the holding force of the toner on the print media and prevents the toner from scattering.
Figure 4-14 Fusing Step 7: Drum cleaning The cleaning blade scrapes the residual toner off of the photosensitive drum and deposits it into the waste-toner case.
5 ENWW Removal and replacement ● Removal and replacement strategy ● Scanner assembly ● Product base 47
Removal and replacement strategy ● Introduction ● Before performing service ● After performing service ● Post-service tests ● Parts removal order Introduction This chapter documents the removal and replacement of field-replaceable units (FRUs) only. Replacing FRUs is generally the reverse of removal. Occasionally, notes and tips are included to provide directions for difficult or critical replacement procedures.
Electrostatic discharge CAUTION: The product contains components that are sensitive to electrostatic discharge (ESD). Always perform service work at ESD-protected workstation. If an ESD-protected workstation is not available, discharge body static by grasping the print engine chassis before touching an ESDsensitive component. Ground the print engine chassis before servicing the product.
● Place the product on an ESD mat, if one is available. If an ESD-protected workstation is not available, discharge body static and ground the print engine chassis before touching an ESDsensitive part. ● Remove the print cartridge. See Print cartridge on page 25. After performing service 50 ● Replace the print cartridge and input tray. ● Reload the input tray with media. ● Perform the post-service tests. See Post-service tests on page 51.
Post-service tests After service has been completed, the following tests can be used to verify that the repair or replacement was successful. Test 1 (print-quality test) 1. Verify that you have completed the necessary reassembly steps. 2. Ensure that the input tray contains clean, unmarked paper. 3. Attach the power cord and interface cable, and then turn on the product. 4. Verify that the expected start-up sounds occur. 5.
Parts removal order Use the following diagrams to determine which parts of the product must be removed before servicing. NOTE: The scanner assembly might be contaminated if it is opened outside of a cleanroom environment. For this reason, the entire scanner assembly is replaceable only as a unit. Replacing the scanner assembly as an entire assembly replaces the scan module, the scan motor, and the cable.
Scanner assembly NOTE: Your product might not appear exactly as the one shown in the photos in this chapter. For example, the color of the external panels and covers might be different than your product. However, this does not affect the validity of the procedures in this chapter. Link assemblies and scanner support-frame spring 1. Push the print-cartridge access button and raise the scanner assembly until it is locked open. 2.
3. Rotate a link assembly toward the front of the product until the link disengages from the scanner support frame. Figure 5-4 Remove the link assemblies and scanner support-frame spring (2 of 4) 4. Remove the link assembly. Repeat these steps to remove the remaining link.
5. Use needle-nose pliers to remove the scanner support-frame spring.
Scanner lid 1. Open the scanner lid. Figure 5-7 Remove the scanner lid (1 of 2) 2. Lift the scanner lid straight up to remove it from the scanner assembly. CAUTION: Avoid touching the flatbed glass. Skin oils and fingerprints can contaminate the glass and cause print-quality problems.
Control-panel overlay Carefully pry the outside edge of the control-panel overlay away from the product to remove it. CAUTION: Be careful to not damage the overlay if it will be reinstalled after servicing the device. TIP: When installing a replacement control-panel overlay, you can dispose of the barcode part-number portion of the replacement overlay.
Control-panel assembly CAUTION: The control-panel is an ESD-sensitive component. 1. Remove the control-panel overlay. See Control-panel overlay on page 57. 2. Remove one screw (callout 1). Figure 5-10 Remove the control-panel assembly (1 of 3) 1 3. Slide the control panel forward and slightly lift up the control panel.
4. Disconnect one FFC (callout 2). Remove the control-panel assembly. CAUTION: Do not bend or fold the FFCs during the removal or reinstallation process.
Scanner assembly CAUTION: Avoid touching the flatbed glass. Skin oils and fingerprints can contaminate the glass or pad and cause print-quality or paper-pickup problems. 1. Remove one screw (callout 1). Figure 5-13 Remove the scanner assembly (1 of 10) 1 2. Release one tab on the back side of the cover.
3. Release the bottom tab (callout 2). Figure 5-15 Remove the scanner assembly (3 of 10) 2 4. Rotate the back side of the cover away from the product, and then slide the cover toward the front of the product to remove it.
5. Push the print-cartridge door button to release the scanner assembly, and then raise the assembly until it locks open. Figure 5-17 Remove the scanner assembly (5 of 10) 6. Disconnect two FFCs (callout 3; J10 and J12) on the formatter. Remove one FFC from the ferrite (callout 4). TIP: It might be easier to thread the FFC through the ferrite by removing one screw and the ferrite (callout 4). The ferrite is not captive in the bracket and can be dislodged when you remove the bracket.
7. Grasp the tab on the gear-drive arm bracket and carefully flex it away from the scanner assembly to release the bracket. Figure 5-19 Remove the scanner assembly (7 of 10) 8. Push the bracket toward the right side of the product until its mounting tabs clear the holes in the scanner assembly.
9. Use a small flat-blade screwdriver to release the tabs on each link assembly. WARNING! When the links are disengaged, the scanner assembly can easily fall off of the product base if it is rotated too far toward the back of the product. CAUTION: Do not push too hard on the link tabs or the tabs might break. Figure 5-21 Remove the scanner assembly (9 of 10) 10. Rotate the scanner assembly toward the rear of the product until the rear hinges clear the chassis hinge pins.
Product base NOTE: Your product might not appear exactly as the one shown in the photos in this chapter. For example, the color of the external panels and covers might be different than your product. However, this does not affect the validity of the procedures in this chapter. Print cartridge CAUTION: To prevent damage, do not expose the print cartridge to direct or bright light. Cover it with a piece of paper. 1.
Separation pad 1. Position the product with the rear side facing you. 2. Support the product and tip it forward. Remove two screws (callout 1). Figure 5-25 Remove the separation pad (1 of 2) 1 3. Remove the separation pad and frame.
Pickup roller 1. Remove the print cartridge and locate the pickup roller. See Print cartridge on page 65. Figure 5-27 Remove the pickup roller (1 of 5) 2. Gently release the small, white tabs on each side of the pickup roller by pushing them away from the roller, and then rotate the roller away from the mounting frame. CAUTION: Do not touch the black-sponge transfer roller inside the product. Touching the transfer roller can damage the product.
3. Gently pull the roller up and out of the product. Figure 5-29 Remove the pickup roller (3 of 5) 4. Circular and rectangular pegs on each side of the pickup roller fit into corresponding slots on the pickup-roller mounting frame and prevent the roller from being incorrectly installed. Position the replacement pickup roller in the slots on the pickup-roller frame.
5. Rotate the top of the pickup roller into position until the white tabs on each side of the roller snap into place.
Scanner cushions 1. Open the print-cartridge door. 2. Place a scanner cushion in each well on the scanner support frame (callout 1). Use the eraser-end of a pencil or use an ink pen with the cap on to seat each cushion in its well.
Media input tray 1. Open the media input tray lid. Figure 5-33 Remove the media input tray (1 of 3) 2. Slide the adjustable media guides to the center of the tray.
3. Depress the pickup-tray locking tabs to release the media input tray, and then pull it out and away from the product.
Transfer roller CAUTION: Do not touch the black-sponge portion of the transfer roller. Skin oils deposited on the transfer roller might cause print-quality problems. 1. Open the print-cartridge door and remove the print cartridge. 2. Release the two small tabs on the transfer roller and then slide the roller to the right to release the left end of the roller shaft. Remove the transfer roller.
Side covers NOTE: The procedure for removing the right-side and left-side covers is identical. The right-side cover is shown in the following procedure. 1. Remove one screw (callout 1). Callout 2 is the left-side cover screw. Figure 5-37 Remove the side covers (1 of 4) 2 1 2. Release the locking tab on the back of the cover.
3. Release the bottom tab (callout 3). Figure 5-39 Remove the side covers (3 of 4) 3 4. Slightly rotate the back side of the right cover away from the product, and then slide it toward the front of the product to release it.
Print-cartridge door 1. Remove the scanner assembly. See Scanner assembly on page 60. 2. Fully open the print-cartridge door and gently pull downward on both print-cartridge swing arms to release them. (In Figure 5-41 Remove the print-cartridge door (1 of 2) on page 76, the left arm is disengaged). CAUTION: Be careful when releasing the swing arms. They can easily break. Figure 5-41 Remove the print-cartridge door (1 of 2) 3.
Rear cover and fuser cover 1. Remove the right-side and left-side covers. See Side covers on page 74. 2. Remove one screw (callout 1). Figure 5-43 Remove the rear cover and fuser cover (1 of 3) 1 3. Release the two rear-cover locking tabs (callout 2). Rotate the bottom of the rear cover up and away from the product, and then remove it.
4. Rotate the bottom of the fuser cover away from the product, and then remove the fuser cover.
Front cover 1. Remove the right-side and left-side covers. See Side covers on page 74. 2. Release the lower left-side front-cover locking tab and slightly pry the lower-left corner of the front cover away from the product. Figure 5-46 Remove the front cover (1 of 4) 3. Release the lower right-side front-cover locking tab (located near the corner of the power supply) and slightly pry the lower-right corner of the front cover away from the product.
4. Rotate the bottom of the front cover away from the product to release it. Figure 5-48 Remove the front cover (3 of 4) 5. Remove the front cover.
Formatter CAUTION: The formatter is an ESD-sensitive device. 1. Remove the left cover. See Side covers on page 74. 2. Disconnect all FFCs and wire harnesses from the formatter. CAUTION: Do not bend or fold the FFCs during the removal or reinstallation process. NOTE: The scanner assembly is shown removed in this procedure. If the scanner assembly is installed, there will be additional FFCs connected to the formatter. You do not need to remove the scanner assembly to remove the formatter. 3.
Power supply 1. 2. Remove the following assemblies: ● Right and left covers. See Side covers on page 74. ● Rear cover and fuser cover. See Rear cover and fuser cover on page 77. ● Front cover. See Front cover on page 79. ● Formatter. See Formatter on page 81. Disconnect one spade connector (callout 1) and remove three screws (callout 2). Figure 5-51 Remove the power supply (1 of 7) 1 2 3. Remove six screws (callout 3) and the sheet-metal plate (callout 4).
4. Disconnect three FFCs (callout 5) and six wire-harness connectors (callout 6). CAUTION: Do not bend or fold the FFCs during the removal or reinstallation process. Figure 5-53 Remove the power supply (3 of 7) 6 6 5 6 6 5. Release the ground wire from the retainer (callout 7) on the product chassis. NOTE: You might need to slightly pry up on the scanner support frame to release the wire from the retainer.
6. Release the wire harness from the retainer (callout 8) on the power supply. Figure 5-55 Remove the power supply (5 of 7) 8 7. Unclip two clips (callout 9) and remove one plastic bracket (callout 10). CAUTION: The wire harness (callout 11) attached to the bracket is not captive. Do not lose this wire harness when the bracket is removed.
8. Remove three screws (callout 12). Remove the power supply.
Scanner support frame 1. 2. Remove the following assemblies: ● Scanner assembly. See Scanner assembly on page 60. ● Right and left cover. See Side covers on page 74. ● Print-cartridge door. See Print-cartridge door on page 76. ● Rear cover and fuser cover. See Rear cover and fuser cover on page 77. ● Front cover. See Front cover on page 79. Remove six screws (callout 1). CAUTION: Be careful not to drop any screws into the product.
3. Rotate the gear-drive bracket until the retainer on the gear-drive arm aligns with the opening in the bracket, and remove the bracket. Figure 5-59 Remove the scanner support frame (2 of 5) 4. Remove one screw (callout 3) and the ferrite and bracket (callout 4). CAUTION: The ferrite is not captive in the bracket and can be dislodged when you remove the bracket.
5. Lift the scanner support frame up and off of the product. Figure 5-61 Remove the scanner support frame (4 of 5) 6. If you are removing the scanner support frame to gain access to the fuser, remove two screws (callout 5) and the chassis reinforcement bracket (callout 6).
Laser/scanner assembly 1. 2. Remove the following assemblies: ● Scanner assembly. See Scanner assembly on page 60. ● Right and left cover. See Side covers on page 74. ● Print-cartridge door. See Print-cartridge door on page 76. ● Rear cover and fuser cover. See Rear cover and fuser cover on page 77. ● Front cover. See Front cover on page 79. ● Scanner support frame. See Scanner support frame on page 86. Remove three screws (callout 1) and one sheet-metal bracket (callout 2).
3. Release one tab and one spring (callout 3) and then remove right-side scanner-assembly locking lever. Figure 5-64 Remove the laser/scanner (2 of 7) 3 4. Push the shaft to the left to disengage it (you might need to release the left-side locking-lever spring), and then rotate the shaft towards the front of the product until the left-side scannerassembly locking lever is in the down position.
5. Lift the laser/scanner cover up and out of the product to remove it. NOTE: When this cover is reinstalled, make sure that the slots in the lower portion of the cover (callout 4; one shown) fit over the edge of the laser/scanner mounting shelf so that the cover is secure and correctly fits inside the product. Figure 5-66 Remove the laser/scanner (4 of 7) 4 6. Disconnect one FFC (callout 5). CAUTION: Do not bend or fold the FFCs during the removal or reinstallation process.
7. Remove four screws (callout 6). NOTE: These four screws are longer than most of the screws used in the product. Do not get them mixed up with screws from previously removed components. Figure 5-68 Remove the laser/scanner assembly (6 of 7) 6 8. Carefully slide the laser/scanner assembly away from the main-motor PCA bracket, and then disconnect one wire-harness connector (callout 7). Remove the laser/scanner assembly.
Main motor 1. 2. Remove the following assemblies: ● Scanner assembly. See Scanner assembly on page 60. ● Formatter. See Formatter on page 81. ● Right and left cover. See Side covers on page 74. ● Print-cartridge door. See Print-cartridge door on page 76. ● Rear cover and fuser cover. See Rear cover and fuser cover on page 77. ● Front cover. See Front cover on page 79. ● Scanner support frame. See Scanner support frame on page 86. ● Laser/scanner assembly.
3. Carefully release two tabs (callout 3) and separate the main motor PCA from the mounting bracket. Figure 5-71 Remove the main motor (2 of 4) 3 4. Remove the main-motor wire harness from the retainers on the mounting bracket (callout 4). Remove the bracket (callout 5).
5. Remove two screws (callout 6). Carefully slip the main-motor drive belt off of the motor shaft (callout 7), and then remove the main motor. Figure 5-73 Remove the main motor (4 of 4) 6 7 TIP: When the main motor is reinstalled, make sure that the wire harness is located toward the top of the motor so that the harness can be correctly positioned in the retainers on the motor PCA mounting bracket.
Fuser 1. 2. Remove the following assemblies: ● Scanner assembly. See Scanner assembly on page 60. ● Right and left covers. See Side covers on page 74. ● Print-cartridge door. See Print-cartridge door on page 76. ● Rear cover and fuser cover. See Rear cover and fuser cover on page 77. ● Front cover. See Front cover on page 79. ● Formatter. See Formatter on page 81. ● Scanner support frame and chassis reinforcement plate. See Scanner support frame on page 86.
3. Disconnect two wire-harness connectors (callout 3; J102, and J552) and remove the harnesses from the retainer (callout 4). NOTE: You might need to disconnect and remove the other wire harnesses to remove the required harness from the retainer. Figure 5-75 Remove the fuser (2 of 6) 4 3 4. Release the wire harness from the retainer near the top of the fuser (callout 5) and disconnect the ground wire (callout 6) from the back of the product.
5. Release one tab (callout 7) and then remove the wire-harness retainer (callout 8). Figure 5-77 Remove the fuser (4 of 6) 8 7 6. Remove three screws (callout 9).
7. Lift up the right side of the fuser assembly to release it from the chassis, and then remove the fuser assembly. Figure 5-79 Remove the fuser assembly (6 of 6) NOTE: When replacing the fuser assembly, be sure to transfer the delivery-sensor PCA from the old fuser to the new one.
Paper-pickup assembly 1. 2. Remove the following assemblies: ● Separation pad. See Separation pad on page 66. ● Scanner assembly. See Scanner assembly on page 60. ● Transfer roller. See Transfer roller on page 73. ● Right and left cover. See Side covers on page 74. ● Print-cartridge door. See Print-cartridge door on page 76. ● Rear cover and fuser cover. See Rear cover and fuser cover on page 77. ● Front cover. See Front cover on page 79. ● Formatter. See Formatter on page 81. ● Fuser.
3. Disconnect two wire harnesses (callout 2; J551 and J556). Figure 5-81 Remove the paper-pickup assembly (2 of 4) 2 4. Remove six screws (callout 3).
5. Separate the assembly from the chassis, and then remove it.
Drive-gear assembly and drive belt 1. Release one tab (callout 1). Rotate the paper-pickup drive-shaft locking clip until the clip retainers align with the holes in the chassis, and then remove the clip. Figure 5-84 Remove the drive-gear assembly and drive belt (1 of 4). 1 2. Carefully slip the drive belt off of the motor shaft (callout 2), and then remove four screws (callout 3). Figure 5-85 Remove the drive-gear assembly and drive belt (2 of 4).
3. Remove the drive-gear assembly. CAUTION: Not all of the gears and springs are captive when you remove the drive-gear assembly. Make sure that you do not lose any of the springs or gears when the assembly is removed. Figure 5-86 Remove the drive-gear assembly and drive belt (3 of 4). 4. Remove one gear (callout 4), and then carefully slip the drive belt (callout 5) off of the drive gear.
6 ENWW Problem solve ● Problem-solving checklist ● Control-panel messages ● Clear jams ● Print problems ● Scan problems ● Copy problems ● Functional checks ● Service-mode functions ● Problem-solving tools ● Problem-solving diagrams ● Firmware updates 105
Problem-solving checklist Follow these steps when trying to solve a problem with the product. Step number Verification step Possible problems Solutions 1 Is the power on? No power due to failed power source, cable, switch, or fuse. 1. Verify that the product is plugged in. 2. Verify that the power cable is functional and that the power switch is on. 3. Check the power source by plugging the product directly into the wall or into a different outlet.
Step number Verification step Possible problems Solutions 6 Does the product scan to the computer? The cable is not connected correctly. Reconnect the cable. Software is not installed correctly or an error occurred during software installation. Uninstall and then reinstall the product software. Verify that you are using the correct installation procedure and the correct port setting. Initiate a scan from the basic desktop software at your computer.
Control-panel messages The majority of the control-panel messages are intended to guide the user through typical operation. The control-panel messages indicate the status of the current operation, and include a page count on the second line of the display, if appropriate. When the product is receiving print data or scanning commands, control-panel messages indicate this status. In addition, alert messages, warning messages, and critical error messages indicate situations that might require some action.
Critical error messages Critical error messages can indicate some kind of failure. Turning off and then turning on the power might fix the problem. If a critical error persists, the product might require service. Critical error message-tables Control panel message Description Recommended action 50.1 Fuser Error The product has experienced an internal hardware error. 1. Turn off the power by using the power switch, and then wait at least 30 seconds. 2. If a surge protector is being used, remove it.
Control panel message Description Recommended action If a surge protector is being used, remove it. Plug the product directly into the wall socket. Use the power switch to turn the product on. If the error persists, contact HP. See www.hp.com/support/LJM1120 or the support flyer that came in the product box. 52 Scanner Error The product has experienced a scanner error.
Clear jams Causes of jams Occasionally, paper or other print media can become jammed during a print job. Some causes include the following events: ENWW ● The input trays are loaded improperly or overfilled, or the media guides are not set properly. ● Media is added to or removed from an input tray during a print job or an input tray is removed from the product during a print job. ● The cartridge door is opened during a print job.
Where to look for jams Jams can occur in these locations: ● In input areas ● In output areas ● In the print-cartridge area Find and remove the jam by using the instructions on the following pages. If the location of the jam is not obvious, first look inside the product. Loose toner might remain in the product after a jam. This problem typically resolves itself after a few sheets have been printed.
ENWW 3. With both hands, grasp the side of the media that is most visible (this includes the middle), and carefully pull it free from the product. 4. Open tray 1 and remove the media stack. 5. With both hands, grasp the side of the jammed media that is most visible (this includes the middle), and carefully pull it free from the product.
6. Replace the print cartridge and close the print-cartridge door.
Clear jams from the output bin CAUTION: Do not use sharp objects, such as tweezers or needle-nose pliers, to remove jams. Damage caused by sharp objects will not be covered by the warranty. With both hands, grasp the side of the jammed media that is most visible (this includes the middle), and carefully pull it free from the product.
Clear jams from the print-cartridge area CAUTION: Do not use sharp objects, such as tweezers or needle-nose pliers, to remove jams. Damage caused by sharp objects will not be covered by the warranty. When removing jammed media, pull the jammed media straight away from the product. Pulling jammed media out of the product at an angle can damage the product. 1. Open the print-cartridge door, and remove the print cartridge.
Avoid repeated jams ENWW ● Verify that the input tray is not overfilled. The input tray capacity varies depending on the type of print media that you are using. ● Verify that the media guides are properly adjusted. ● Check that the input tray is securely in place. ● Do not add print media into the input tray while the product is printing. ● Use only HP-recommended media types and sizes. ● Do not fan media prior to loading it in a tray.
Print problems Print-quality problems The information in the following sections helps you identify and resolve print-quality issues. NOTE: If you are having copy problems, see Copy problems on page 127. Improve print quality Use the print-quality settings to prevent print-quality problems. Print-quality settings Print-quality settings affect how light or dark the print is on the page and the style in which the graphics are printed.
For Windows Vista: 1. In the Windows system tray, click Start, click Control Panel, and then click Printer. 2. Right-click the product icon. 3. Click Properties, or click Printing Preferences. 4. Change the settings, and then click OK. Identify and correct print defects Use the checklist and print-quality issues charts in this section to solve print-quality problems. Print-quality checklist General print-quality problems can be solved by using the following checklist: ENWW 1.
General print-quality issues The following examples depict letter-size paper that has passed through the product short-edge-first. These examples illustrate problems that would affect all of the pages that you print. The topics that follow list the typical cause and solution for each of these examples. Problem Print is light or faded. Toner specks appear. Dropouts appear. Example Cause Solution The media might not meet HP specifications. Use media that meets HP specifications.
Problem The amount of background toner shading becomes unacceptable. Toner smears appear on the media. The toner smears easily when touched. ENWW Example Cause Solution The media might not meet HP specifications. Use a different paper with a lighter basis weight. The priority input tray might be installed incorrectly. Make sure that the priority input tray is in place. The print-density setting is too high. Decrease the print-density setting through the print driver.
Problem Marks repeatedly appear at even intervals on the page. The printed page contains misformed characters. The printed page is curled or wavy. Example Cause Solution The product is not set to print on the type of media on which you want to print. In the printer driver, make sure that the appropriate media type is selected. Print speed might be slower if you are using heavy paper. Internal parts might have toner on them. The problem typically corrects itself after a few more pages.
Problem The printed page contains wrinkles or creases. Example Cause Solution The media might be loaded incorrectly or the input tray might be too full. Turn over the stack of paper in the input tray, or try rotating the paper 180° in the input tray. Verify that the media is loaded correctly and that the media guides are not too tight or too loose against the stack. See Install input devices on page 19. Toner appears around the printed characters.
Scan problems Solve scanned-image problems Problem Cause Solution The scanned image is of poor quality. The original might be a second-generation photo or picture. ● To eliminate the patterns, try reducing the size of the image after scanning. ● Print the scanned image to see if the quality is better. ● Verify that the resolution settings are correct for the type of scan job that you are performing. ● Try adjusting your computer monitor settings to use more colors (or levels of gray).
ENWW Problem Cause Solution The scan takes too long The resolution or color level is set too high. Change the resolution and color settings to the correct settings for your job. The software is set to scan in color. The system default is color, which takes longer to scan even when scanning a monochrome original. If you acquire an image through TWAIN or WIA, you can change the settings so that the original scans in grayscale or black-and-white. See the product software Help for details.
Scan-quality problems Prevent problems The following are a few simple steps you can take to improve copy and scan quality. ● Use high-quality originals. ● Place the media on the flatbed glass correctly (face-down with the upper-left corner of the document at the corner of the glass indicated by the icon). ● Adjust the software settings according to how you plan to use the scanned page. ● If your product frequently feeds more than one page at a time, the separation pad might need to be replaced.
Copy problems Prevent problems The following are a few simple steps you can take to improve copy quality: ● Use quality originals. ● Place the media on the flatbed glass correctly (face-down with the upper-left corner of the document at the corner of the glass indicated by the icon). ● Use or make a carrier sheet to protect your originals. NOTE: Verify that the media meets HP specifications.
Problem Cause Solution Unwanted lines or dots appear on the copy. The flatbed scanner might be dirty. Clean the flatbed scanner. See Clean the flatbed scanner glass on page 28. The photosensitive drum inside the print cartridge might have been scratched. Install a new HP print cartridge. See Print cartridge on page 25. Ink, glue, correction fluid, or an unwanted substance might be on the flatbed scanner. Clean the flatbed scanner. See Clean the flatbed scanner glass on page 28.
Problem Cause Solution Problems with feeding The paper has ragged edges. Use high-quality paper that is made for laser printers. The paper varies from side-to-side. Turn the paper over. The paper is too moist, too rough, too heavy or too smooth, has the wrong grain direction, or is of short-grain construction or it is embossed or from a faulty paper lot. Try another kind of paper, between 100 and 250 Sheffield, 4 to 6% moisture content. Print is skewed (crooked).
Performance problems Problem Cause Solution No copy came out. The input tray might be empty. Load media in the product. See Install input devices on page 19 for more information. The original might have been loaded incorrectly. On the flatbed scanner, place the original document face-down with the upper-left corner of the document at the corner of the glass indicated by the icon on the scanner. The sealing tape might not have been removed from the print cartridge.
Functional checks Engine test page 1. Turn the product power on and wait for the message Ready to appear on the control-panel display. 2. Rapidly open and then close the print-cartridge door five times. CAUTION: Do not forcibly close the door to prevent damaging the door latches. TIP: Depress and hold down the print-cartridge door button to prevent the door latches from engaging. Open the door far enough to activate the door open sensor, and then fully close the door (rapidly, five times). 3.
Half self-test functional check The print process can be subdivided into the following stages: ● Image formation stage (charges the drum and writes a latent image to the drum with the laser) ● Development stage (forms a toner image on the drum) ● Transfer stage (transfers the image to the media) ● Cleaning stage (removes excess toner from the drum) ● Fusing stage (applies heat and pressure to the media to make the image permanent) Perform a half self-test check The purpose of the half self-test ch
Heating element check Media passes between the heating element and a soft pressure roller to fuse toner to the media. 1. Unplug the product for at least ten minutes. 2. Verify that the thermistor connector is seated into both the product chassis and the ECU. 3. Remove the heating element connector from the ECU. To measure the continuity of the heating element, measure the resistance between the two pins at the end of the cable.
Figure 6-2 Print-cartridge high-voltage connection points (left side) 2 3 Check the high-voltage connector assembly Visually inspect the cartridge connection points inside the product to make sure that they are not dirty or corroded. If the pins are dirty, clean them by using isopropyl alcohol only.
Service-mode functions NVRAM initialization An NVRAM initialization returns the device settings to the factory-set defaults. 1. Turn off the product. 2. Press and hold both the Start Copy button and the Cancel button, and then turn on the product. 3. Wait until the message Permanent storage init. appears, and then release the buttons. When the NVRAM initialization process finishes, the product control panel shows the Ready message.
Menu item Submenu Description Display test Use the Display test sub-menu to run a test of the control-panel display lights and LCD screen. Button test Use the Button test sub-menu to run a test of the control-panel buttons. Show FW Version Use the Show FW Version sub-menu to display the firmware version number. High Speed USB On (default) Use the High Speed USB to enable or disable the high-speed function of the USB port.
Problem-solving tools Product information pages and reports Information pages and reports reside within the product memory. These pages and reports help diagnose and solve problems with the product. NOTE: If the product language was not correctly set during installation, you can set the language manually so the information pages print in one of the supported languages. Change the language by using the System setup menu on the control panel or by using the embedded Web server.
Service menu Use the control-panel Service menu to solve product problems. In the table below, an asterisk (*) denotes the default setting. Service menu item Submenu option Description Restore defaults None Press OK to restore the product factory settings. Cleaning mode None Press OK to start the cleaning process. See Clean the paper path on page 29 for more information. Archive print Off* On The archive print feature produces output that is less susceptible to toner smearing and dusting.
Turn on archive print ENWW 1. On the product control panel, press Setup. 2. Use the arrow buttons to select Service, and then press OK. 3. Use the arrow buttons to select Archive print, On, or Off, and then press OK.
Problem-solving diagrams ● Repetitive image defects ● Interface ports ● Formatter connectors ● ECU connectors ● Solenoid and motor ● Rollers ● Sensors ● Major components ● PCAs (base unit) ● Circuit diagram Repetitive image defects If the product output has a consistent, repetitive defect, then use Table 6-1 Repetitive image defects on page 140 to determine which part needs to be replaced based on the measured distance between the repetitions of the defect.
Interface ports All models have a Hi-Speed USB 2.0 port. The HP LaserJet M1120n also has a 10/100 Base-T (RJ-45) network port. 1 2 ENWW 1 Hi-Speed USB 2.
Formatter connectors Figure 6-3 Formatter connectors J12 J10 J17 J8 J18 J14 Table 6-2 Formatter connectors Item Description J8 High-speed USB 2.
ECU connectors Figure 6-4 ECU connectors Table 6-3 ECU connectors ENWW Item Description J101 Fuser (not shown) J102 Power switch J501 Interlock J531 Formatter PCA (communication, +5v, +3.
Solenoid and motor Figure 6-5 Solenoid and motor 1 2 Table 6-4 Solenoid and motor Item Description 1 Pickup solenoid 2 Main motor 144 Chapter 6 Problem solve ENWW
Rollers Figure 6-6 Rollers 1 2 Table 6-5 Rollers ENWW Item Description 1 Transfer roller (fastened to the rear door) 2 Pickup roller Problem-solving diagrams 145
Sensors Figure 6-7 Sensors PS702 PS701 PS751 Table 6-6 Sensors Item Description PS701 Fuser-delivery sensor PS702 Media-width sensor PS751 Top-of-page sensor 146 Chapter 6 Problem solve ENWW
Major components Figure 6-8 Major components 1 2 4 31 Table 6-7 Major components ENWW Item Description 1 Fuser assembly 2 Laser/scanner assembly 3 Paper-pickup assembly 4 Separation-pad assembly Problem-solving diagrams 147
PCAs (base unit) Figure 6-9 PCAs (base unit) 1 2 Table 6-8 PCAs (base unit) Item Description 1 Formatter PCA 2 Engine-controller PCA (ECU) 148 Chapter 6 Problem solve ENWW
1 2 TH1 2 FSRTH GND 3 /BDIR +3.3R /PISNS +3.
Firmware updates Firmware updates and installation instructions for this product are available at www.hp.com/support/ LJM1120. Click Downloads and drivers, click the operating system, and then select the firmware download for the product.
7 ENWW Parts ● Ordering information ● Supplies and hinge tool ● Cable and interface accessories ● Whole-unit replacement ● Control-panel overlays ● Supplementry documentation and support ● Parts lists and diagrams ● Scanner assemblies ● Assemblies ● External covers and panels ● Internal components (1 of 3) ● Internal components (2 of 3) ● Internal components (3 of 3) ● Alphabetical parts list ● Numerical parts list 151
Ordering information Order replacement parts, supplies, and paper from the following Web sites: ● To order genuine HP parts and accessories, go to www.hp.com/buy/parts.com. ● To order supplies and paper, go to www.hp.com/buy/suresupply.com. Supplies and hinge tool Product name Description Part number Replacement print cartridge Average yield for the print cartridge is approximately 2,000 pages. Actual yield depends on use.
Whole-unit replacement Use the tables in this section to find the whole-unit replacement part number for a specific product bundle and localized configuration.
Table 7-1 Whole-unit replacement, product bundle CC537A (continued) Country/region Localized configuration Replacement part number Europe, Middle East, and Africa ABD - Germany-German CC537-67916 ABF - France-French CC537-67917 ABH - Netherlands-Dutch CC537-67918 ABZ - Italy-Italian CC537-67919 ABE - Spain-Spanish localization CC537-67920 BFY - Spain-Catalan localization CC537-67921 ABU - United Kingdom-English CC537-67922 B14 - Belgium-Dutch/French CC537-67923 AR8 - Switzerland-French/G
Table 7-2 Whole-unit replacement, product bundle CC459A ENWW Country/region Localized configuration Replacement part number Asia Pacific AB0 - Taiwan-Traditional Chinese CC459-67901 AB1 - Korea-Korean localization CC459-67902 AB2 - China-Simplified Chinese CC459-67903 AB3 - Thailand-Thai CC459-67904 AB4 - Singapore-English CC459-67905 BFV - Hong Kong SAR-English/Traditional Chinese CC459-67906 ABG - Australia-English CC459-67907 A2K - Philippines-English CC459-67908 ACJ - India-English
Table 7-2 Whole-unit replacement, product bundle CC459A (continued) Country/region Localized configuration Replacement part number Europe, Middle East, and Africa ABD - Germany-German CC459-67914 ABF - France-French CC459-67915 ABH - Netherlands-Dutch CC459-67916 ABZ - Italy-Italian CC459-67917 ABE - Spain-Spanish localization CC459-67918 BFY - Spain-Catalan localization CC459-67919 ABU - United Kingdom-English CC459-67920 B14 - Belgium-Dutch/French CC459-67921 AR8 - Switzerland-French/G
Control-panel overlays Table 7-3 Control-panel overlays, HP LaserJet M1120 ENWW Item Language Part number Control-panel overlay English (EN) CB537-00003 Control-panel overlay Spanish (ES) CB537-00004 Control-panel overlay Portuguese (PT) CB537-00005 Control-panel overlay German (DE) CB537-00006 Control-panel overlay French (FR) CB537-00007 Control-panel overlay Dutch (NL) CB537-00008 Control-panel overlay Italian (IT) CB537-00009 Control-panel overlay Swedish (SV) CB537-00010 Co
Table 7-3 Control-panel overlays, HP LaserJet M1120 (continued) Item Language Part number Control-panel overlay Ukranian (UK) CB537-00036 Control-panel overlay Serbian (SR) CB537-00037 Control-panel overlay Lithuanian (LT) CB537-00038 Control-panel overlay Estonian (ET) CB537-00039 Control-panel overlay Latvian (LV) CB537-00040 Table 7-4 Control-panel overlays, HP LaserJet M1120n Item Language Part number Control-panel overlay English (EN) CC459-00003 Control-panel overlay Spanish (
Table 7-4 Control-panel overlays, HP LaserJet M1120n (continued) ENWW Item Language Part number Control-panel overlay Romanian (RO) CC459-00029 Control-panel overlay Croation (HR) CC459-00030 Control-panel overlay Slovenian (SL) CC459-00031 Control-panel overlay Indonesian (ID) CC459-00032 Control-panel overlay Kazakh (KK) CC459-00033 Control-panel overlay Bulgarian (BG) CC459-00034 Control-panel overlay Ukranian (UK) CC459-00035 Control-panel overlay Serbian (SR) CC459-00036 Co
Supplementry documentation and support Table 7-5 Documentation (print on demand) Description Languages Part number Service manual (this manual) English only CB537-90945 Getting Started guides English, Spanish, Portuguese, French CB537-90901 English, Spanish, Portuguese, Catalan, Dutch, French, German, Italian CB537-90902 English, Danish, Finnish, French, Norwegian, Swedish, Arabic CB537-90903 English, Bulgarian, Czech, Hungarian, Polish, Romanian, Russian, Slovak CB537-90904 English, Kazakh,
Table 7-5 Documentation (print on demand) (continued) ENWW Description Languages Part number User guides, continued Danish CB537-90918 Dutch CB537-90919 Estonian CB537-90920 Finnish CB537-90921 French CB537-90909 German CB537-90910 Greek CB537-90922 Hebrew CB537-90944 Hungarian CB537-90923 Indonesian CB537-90924 Italian CB537-90911 Kazakh CB537-90925 Korean CB537-90926 Latvian CB537-90927 Lithuanian CB537-90928 Norwegian CB537-90929 Polish CB537-90930 Portuguese CB53
Parts lists and diagrams How to use the parts lists and diagrams The figures in this chapter show the major subassemblies in the product and their component parts. A parts list table follows each exploded-view assembly diagram. Each table lists the item number, the associated part number, and the description of each part. If a part is not listed in the table, then it is not a field replaceable unit (FRU). CAUTION: Be sure to order the correct part.
Types of screws Illustration Description Size Part number Use Screw, RS M3X6 XB2-8300-609CN Used to secure plastic to metal M3X8 XA9-1504-000CN M3X10 XA9-1501-000CN Screw, D M3X6 XA9-1670-000CN Used to secure plastic to metal Screw w/washer M3X6 XB2-7300-605CN M3X8 XA9-1420-000CN Used to secure metal components to metal components M4X10 XB4-5401-009CN M3X9 0515-4671 Screw tapping Used to secure anything to plastic Control panel to scanner 12 mm ENWW Parts lists and diagrams 16
Scanner assemblies Figure 7-1 Scanner assemblies 1 2 4 3 164 Chapter 7 Parts ENWW
Table 7-6 Scanner assemblies ENWW Ref Description Part number Qty 1 Flatbed lid CB537-60102 1 2 Control-panel assembly, LJm1120 (Western) CB537-60109 1 2 Control-panel assembly, LJm1120 (Asian) CB537-60110 1 3 SSA PKG FGI ASSY LJm1120 (scanner flatbed assembly) CB537-67901 1 4 LJm1005 HP Jewel 7121-8285 1 Scanner assemblies 165
Assemblies Figure 7-2 Assemblies 1 2 3 4 5 7 166 Chapter 7 Parts 6 ENWW
Table 7-7 Assemblies ENWW Ref Description Part number Qty 1 Control-panel overlay See Control-panel overlays on page 157.
External covers and panels Figure 7-3 External covers and panels 1 2 4 7 3 5 6 168 Chapter 7 Parts ENWW
Table 7-8 External covers and panels ENWW Ref Description Part number Qty 1 Cover, rear RC2-2971-000CN 1 2 Cover, cartridge RC2-2960-000CN 1 3 Cushion, scanner RC1-2476-000CN 2 4 Cover, right RL1-1736-000CN 1 5 Cover, front RL1-1734-000CN 1 6 Cover, left RL1-1735-000CN 1 7 Cover, top RL1-1732-000CN 1 External covers and panels 169
Internal components (1 of 3) Figure 7-4 Internal components (1 of 3) 1 3 2 170 Chapter 7 Parts ENWW
Table 7-9 Internal components (1 of 3) ENWW Ref Description Part number Qty 1 Fuser assembly, 110v-220v RM1-4721-000CN 1 1 Fuser assembly, 220v-240v RM1-4726-000CN 1 2 Engine controller PCA (ECU), 110v-220v RM1-4932-000CN 1 2 Engine controller PCA (ECU), 220v-240v RM1-4936-000CN 1 3 Link, coupling RC2-2965-000CN 1 Internal components (1 of 3) 171
Internal components (2 of 3) Figure 7-5 Internal components (2 of 3) 3 2 6 1 5 4 172 Chapter 7 Parts ENWW
Table 7-10 Internal components (2 of 3) ENWW Ref Description Part number Qty 1 Paper-pickup assembly RM1-4727-000CN 1 2 Roller, transfer RM1-4234-000CN 1 3 Roller, pickup RL1-1497-000CN 1 4 Separation-pad assembly RM1-4207-000CN 1 5 Latch, left RC1-2498-000CN 1 6 Latch, right RC1-2499-000CN 1 Internal components (2 of 3) 173
Internal components (3 of 3) Figure 7-6 Internal components (3 of 3) 2 1 4 5 3 174 Chapter 7 Parts ENWW
Table 7-11 Internal components (3 of 3) ENWW Ref Description Part number Qty 1 Laser/scanner assembly RM1-4724-005CN 1 2 Motor-controller PCA RM1-4935-000CN 1 3 Tray guide, left RC2-2979-000CN 1 4 Tray guide, right RC2-2980-000CN 1 5 Motor, 24V DC RM1-4196-000CN 1 Internal components (3 of 3) 175
Alphabetical parts list Table 7-12 Alphabetical parts list Description Part number Table and page Control-panel assembly, LJm1120 (Asian) CB537-60110 Scanner assemblies on page 165 Control-panel assembly, LJm1120 (Western) CB537-60109 Scanner assemblies on page 165 Control-panel overlay See Control-panel overlays on page 157.
Table 7-12 Alphabetical parts list (continued) ENWW Description Part number Table and page Link, coupling RC2-2965-000CN Internal components (1 of 3) on page 171 LJm1005 HP Jewel 7121-8285 Scanner assemblies on page 165 Motor, 24V DC RM1-4196-000CN Internal components (3 of 3) on page 175 Motor-controller PCA RM1-4935-000CN Internal components (3 of 3) on page 175 Paper-delivery tray assembly RM1-4725-000CN Assemblies on page 167 Paper-pickup assembly RM1-4727-000CN Internal components
Numerical parts list Table 7-13 Numerical parts list Part number Description Table and page 7121-8285 LJm1005 HP Jewel Scanner assemblies on page 165 CB537-60102 Flatbed lid Scanner assemblies on page 165 CB537-60109 Control-panel assembly, LJm1120 (Western) Scanner assemblies on page 165 CB537-60110 Control-panel assembly, LJm1120 (Asian) Scanner assemblies on page 165 CB537-67901 SSA PKG FGI ASSY LJm1120 (scanner flatbed assembly) Scanner assemblies on page 165 CC390-60001 Formatter, st
Table 7-13 Numerical parts list (continued) ENWW Part number Description Table and page RM1-3953-000CN Scanner-link assembly, left Assemblies on page 167 RM1-3954-000CN Scanner-link assembly, right Assemblies on page 167 RM1-4196-000CN Motor, 24V DC Internal components (3 of 3) on page 175 RM1-4207-000CN Separation-pad assembly Internal components (2 of 3) on page 173 RM1-4234-000CN Roller, transfer Internal components (2 of 3) on page 173 RM1-4721-000CN Fuser assembly, 110v-220v Inter
180 Chapter 7 Parts ENWW
A Service and support Hewlett-Packard limited warranty statement HP PRODUCT DURATION OF LIMITED WARRANTY HP LaserJet M1120 and M1120n One-year limited warranty HP warrants to you, the end-user customer, that HP hardware and accessories will be free from defects in materials and workmanship after the date of purchase, for the period specified above. If HP receives notice of such defects during the warranty period, HP will, at its option, either repair or replace products which prove to be defective.
(INCLUDING LOST PROFIT OR DATA), OR OTHER DAMAGE, WHETHER BASED IN CONTRACT, TORT, OR OTHERWISE. Some countries/regions, states or provinces do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. THE WARRANTY TERMS CONTAINED IN THIS STATEMENT, EXCEPT TO THE EXTENT LAWFULLY PERMITTED, DO NOT EXCLUDE, RESTRICT OR MODIFY AND ARE IN ADDITION TO THE MANDATORY STATUTORY RIGHTS APPLICABLE TO THE SALE OF THIS PRODUCT TO YOU.
Print cartridge limited warranty statement This HP product is warranted to be free from defects in materials and workmanship. This warranty does not apply to products that (a) have been refilled, refurbished, remanufactured or tampered with in any way, (b) experience problems resulting from misuse, improper storage, or operation outside of the published environmental specifications for the device product or (c) exhibit wear from ordinary use.
Customer support Get telephone support, free during your warranty period, for your country/region Country/region phone numbers are on the flyer that was in the box with your product or at www.hp.com/support/. Have the product name, serial number, date of purchase, and problem description ready. Get 24-hour Internet support www.hp.com/support/LJM1120 Get support for products used with a Macintosh computer www.hp.com/go/macosx Download software utilities, drivers, and electronic information www.hp.
B Specifications This section contains the following information about the product: ENWW ● Physical specifications ● Electrical specifications ● Power consumption ● Environmental specifications ● Acoustic emissions 185
Physical specifications Table B-1 Physical specifications Product Height Depth Width Weight HP LaserJet M1120 308 mm (12.1 in) 363 mm (14.3 in) 437 mm (17.2 in) 8.2 kg (18.7 lb) HP LaserJet M1120n 308 mm (12.1 in) 363 mm (14.3 in) 437 mm (17.2 in) 8.2 kg (18.7 lb) Electrical specifications CAUTION: Power requirements are based on the country/region where the product is sold. Do not convert operating voltages. This will damage the product and void the product warranty.
Environmental specifications Table B-4 Environmental specifications1 Temperature Relative humidity 1 Recommended Operating Storage 15° to 32.5° C 15° to 32.5° C –20° to 40° C (59° to 90.5° F) (59° to 90.5° F) (–4° to 104° F) 10% to 80% 10% to 80% 95% or less Values are subject to change. Acoustic emissions Table B-5 Acoustic emissions ENWW Sound Power Level Declared per ISO 92961 Printing (19 ppm) LWAd = 6.
188 Appendix B Specifications ENWW
C Regulatory information This section contains the following regulatory information: ENWW ● FCC compliance ● Environmental product stewardship program ● Declaration of conformity ● Safety statements 189
FCC compliance This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy. If it is not installed and used in accordance with the instructions, it may cause harmful interference to radio communications.
Plastics Plastic parts over 25 grams are marked according to international standards that enhance the ability to identify plastics for recycling purposes at the end of the product’s life. HP LaserJet print supplies It’s easy to return and recycle your empty HP LaserJet print cartridges—free of charge—with HP Planet Partners. Multilingual program information and instructions are included in every new HP LaserJet print cartridge and supplies package.
package to a U.S. Postal Service carrier or drop off at a U.S.Postal Service Office. For more information, or to order additional labels or boxes for bulk returns, visit http://www.hp.com/recycle or call 1-800-340-2445. Requested UPS pickup will be charged normal pickup rates. Information subject to change without notice.
● HP’s end-of-life product return and recycling program ● Material Safety Data Sheets Visit www.hp.com/go/environment or www.hp.com/hpinfo/globalcitizenship/environment/index.html.
Declaration of conformity Declaration of Conformity according to ISO/IEC 17050-1 and EN 17050-1 Manufacturer's Name: Manufacturer's Address: Hewlett-Packard Company DoC#: BOISB-0604-03-rel.1.
Safety statements Laser safety The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration has implemented regulations for laser products manufactured since August 1, 1976. Compliance is mandatory for products marketed in the United States. The device is certified as a “Class 1” laser product under the U.S. Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968.
Laser statement for Finland Luokan 1 laserlaite Klass 1 Laser Apparat HP LaserJet M1120, M1120n, laserkirjoitin on käyttäjän kannalta turvallinen luokan 1 laserlaite. Normaalissa käytössä kirjoittimen suojakotelointi estää lasersäteen pääsyn laitteen ulkopuolelle. Laitteen turvallisuusluokka on määritetty standardin EN 60825-1 (1994) mukaisesti.
O:表示在此部件所用的所有同类 材料中，所含的此有毒或有害物质 均低于 SJ/T11363-2006 的限制要 求。 X:表示在此部件所用的所有同类 材料中，至少一种 所含的此有毒或有害物质 高于 SJ/T11363-2006 的限 制要求。 NOTE: 引用的“环 保使用期限”是根据在正常温度和湿度条件下操作使用产 品而确定的。 ENWW Safety statements 197
198 Appendix C Regulatory information ENWW
Index Symbols/Numerics 600 dpi print-quality setting 118 A accessibility features 4 accessories part numbers 152 acoustic emissions 187 advanced software installation after service checklist 50 alert messages 108 archive print setting 138 assemblies high-voltage connector, cleaning 134 part numbers 166 B background shading, troubleshooting 121 bands and streaks, troubleshooting 120 batteries included 192 before service checklist 49 bin, output capacity 4 jams, clearing 115 locating 5 blank copies, troubles
crooked pages 122 curled media 122, 138 cushions, scanner installing 70 customer support online 184 repacking device 184 D dark copying 128 defaults, restoring 138 defects, repetitive 140 delivery roller locating 38 Demo page, printing 137 demo page, printing 30 diagrams troubleshooting 140 dimensions media 12 disposal, end-of-life 192 documentation 2 documentation, part numbers 160 door, cartridge remove 76 dots per inch (dpi) print settings 118 specifications 4 dots, troubleshooting copies 128 dpi (dots p
input tray loading media 19 install tray 1 20 installation, software advanced 8 easy 7 installing Windows software 7 installing hardware scanner cushions 70 interface ports cables, ordering 152 locating 6, 141 types included 4 internal components 38 internal components, part numbers 170 J jams causes of 111 locating 112 output-bin, clearing 115 preventing 117 print cartridge area, clearing 116 trays, clearing 112 K Korean EMI statement 195 L laser safety statements 195, 196 laser/scanner assembly diagrams
overlays, control panel part numbers 157 P packaging device 184 pages skewed 122 pages per minute 4 paper curled, troubleshooting 122, 138 feeding operations 42 jams 111 pickup/feed/delivery system 42 supported sizes 12 supported types 13 wrinkled 123 paper jams detection operations, pickup/ feed/delivery system 42 paper path, cleaning 138 paper-pickup assembly remove 100 part numbers cables 152 control-panel overlays 157 covers 168 documentation 160 internal components 170 scanner assemblies 164 screws 163
paper-pickup assembly, replace 100 power supply, replace 82 print-cartridge door, remove 76 rear cover, remove 77 scanner cushions, installing 70 scanner support frame, remove 86 side covers, remove 74 transfer roller, replace 73 tray, remove 71 Q quality archive print setting 138 cleaning page, printing 138 copy, troubleshooting 127 print settings 118 print, troubleshooting 118, 119 repetitive image defects 140 scans, troubleshooting 124, 126 R rear cover remove 77 recycling HP printing supplies returns an
media detection 42 scanner operations 36 separation pad replacing 66 separation pad, locating 38 separation pads diagrams 147 sequence of operations 34 serial number, locating 6 service critical error messages 109 part numbers 152 repacking device 184 secondary menu 135 service agreements 184 Service menu 138 servicing 49 servicing product 48 settings configuration page 137 factory-set defaults, restoring 138 NVRAM initialization 135 shipping device 184 side covers remove product 74 size 186 size, copy trou
heating element 133 image formation 132 information pages 137 jams 111 lines, copies 128 lines, printed pages 120 loose toner 121 menu map 137 NVRAM initialization 135 pages too dark 128 pages too light 128 print defects 119 print quality 118 repetitive defects 123 reports 137 scan quality 124, 126 scan-image quality 124 scanning 124 skewed pages 122 spots, scans 126 text 122 toner scatter 123 toner smear 121 toner specks 120 tools 137 wrinkles 123 wavy paper, troubleshooting 122 Web sites customer support
206 Index ENWW
© 2008 Hewlett-Packard Development Company, L.P. www.hp.
