User manual HP LASERJET 6L PRINTER SERVICE MANUAL

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[. . . ] HP LaserJet 5L and 6L Printer Service Manual Service Manual HP LaserJet 5L (C3941A) HP LaserJet 6L (C3990A) © Copyright Hewlett-Packard Company 1997 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number C3990-90991 First edition, May 1997 Warranty The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties or merchantability and fitness for a particular purpose. [. . . ] 2 Grasp both tabs at the lower ends of the Exit Roller bushings and pull inward. This will release the tabs from the printer chassis (Figure 6-8, callout 1). 3 Rotate the tabs 90 degrees, clear of the printer chassis (Figure 6-8, callout 2). 4 Lift the roller out. Figure 6-8 Exit Roller Removal To reinstall The end of the Exit Roller that has a gear attached must fit into the gear train. It is possible to reinstall the Exit Roller so that the gear end is on the opposite side of the printer; this placement would cause paper path problems. 6 - 12 Removal and Replacement Delivery Assembly Removal and 6 Replacement 1 Remove the Printer Covers and Exit Roller Assembly. 2 Remove the EP Right-Hand assembly by pressing the tab in (Figure 6-9, callout 1) and sliding the assembly toward the front of the printer (Figure 6-9, callout 2). Note Figure 6-9 The EP Right-Hand assembly must be removed to access any fuser components. Delivery Assembly Removal (1 of 2) Removal and Replacement 6 - 13 3 Use the magnetic screwdriver to remove the (2) screws (Figure 6-10, callout 1). Once the screws have been removed, rotate the rear of the Delivery Assembly up and forward and lift it out of the printer. Figure 6-10 Delivery Assembly Removal (2 of 2) Note Upon reinstallation, the tabs on the front end of the Delivery Assembly must fit under the sheet metal fuser plate below to correctly reseat the Delivery Assembly. 6 - 14 Removal and Replacement Fuser Pressure Plate Removal and 6 Replacement 1 Remove Printer Covers and Delivery Assembly (Figures 6-9 and 6-10). 3 Press the Fuser Plate retainer clips out to release the Pressure Plate (Figure 6-11, callout 2). 4 Rotate the plate around and toward the back and lift up to remove it (Figure 6-11, callout 3). Figure 6-11 Fuser Pressure Plate Removal Removal and Replacement 6 - 15 To reinstall: The Fuser Pressure Plate is kept in place by four locking mechanisms in each corner. Place the rear slits in the plate over the rear brackets that hold the Fusing Assembly (Figure 6-12, callout 1). Lower the plate over the retaining clips, pressing on both sides of the Fuser Pressure Plate (Figure 6-12, callout, 2). It is important that the spring is placed over the positioning pin (callout 3) because inadequate pressure will cause fusing problems. Replace the screws. Figure 6-12 Fuser Pressure Plate Replacement 6 - 16 Removal and Replacement Heating Element Removal and 6 Replacement 1 Remove Printer Covers, Delivery Assembly (Figures 6-9 and 6-10), and Fuser Pressure Plate (Figure 6-11). 2 Remove the wire cover (on the right side of the printer) for the Heating Element wires by pressing in on the tab and pulling outward (Figure 6-13, callout 1). Figure 6-13 Heating Element Removal (1 of 3) Removal and Replacement 6 - 17 3 Disconnect the AC voltage to the Heating Element by releasing the connector located on the DC Controller. Press down on the connector release with a small, flathead screwdriver (Figure 6-14, callout 1). (Since this is a small space, it is much easier to reach the connector with a screwdriver. ) Pull straight out (Figure 6-14, callout 2). Figure 6-14 Heating Element Removal (2 of 3) 6 - 18 Removal and Replacement 4 Remove the wire from the wire guides along the right-side of the printer. 5 Disconnect the thermistor feedback connector in the left front side of the Fusing Removal and 6 Replacement Assembly (Figure 6-15). Figure 6-15 Heating Element Removal (3 of 3) 6 Lift the Heating Element out. To reinstall Make sure the connectors are properly reattached. Removal and Replacement 6 - 19 Pressure Roller 1 Remove Printer Covers, Delivery Assembly (Figures 6-9 and 6-10), Fuser Pressure Plate (Figure 6-11), and Heating Element (Figures 6-13 through 6-15). 2 Remove the Pressure Roller guide by lifting the edge (Figure 6-16, callout 1) and then rolling it gently backward (Figure 6-16, callout 2). Figure 6-16 Pressure Roller Guide Removal 3 Lift the right end of the Pressure Roller up and out of the printer chassis. Note The right end of the Pressure Roller is greased. 4 The left side will follow easily with the Pressure Roller gear still attached. Note When reinstalling the Pressure Roller, apply a drop of grease to the grounding plate on the right side of the shaft. (Refer to Chapter 8 for a part number. ) 6 - 20 Removal and Replacement Face-Up/Face-Down Lever Removal and 6 Replacement 1 Remove Printer Covers, Delivery Assembly (Figures 6-9 and 6-10), Fuser Pressure Plate (Figure 6-11), and Heating Element (Figures 6-13 through 6-15), and Pressure Roller (Figure 6-16). 2 Rotate the lever forward 90 degrees (past the spring) and pull it straight out the front of the printer. To reinstall 1 Make sure the lever arm is on the left and is initially pointing downward. 3 Slide the short, round tabs into the grooves on the Separation Guide Assembly. The machined ridges on the lever will face you. 4 Release the spring so it falls in place in front of the square tab (Figure 6-17). Note While the shape of the lever was changed for the HP LaserJet 6L (a stiffening rod was also added), these procedures for Face-Up/Face-Down Lever removal remain unchanged. Figure 6-17 shows the lever from an HP LaserJet 5L. Figure 6-17 Face-Up/Face-Down Lever Replacement Note You can tell when the lever is in place because there are two plastic grooves that fit precisely in front of the Exit Rollers, and you should be able to feel the spring's release mechanism. Removal and Replacement 6 - 21 Fuser Exit Roller Assembly 1 Remove Printer Covers, Delivery Assembly (Figures 6-9 and 6-10), Fuser Pressure Plate (Figure 6-11), and Heating Element (Figures 6-13 through 6-15), Pressure Roller (Figure 6-16), and Face-Up/Face-Down Lever (Figure 6-17). 2 Remove the gear from the left end of the roller shaft by pressing down on the catching mechanism with the small flathead screwdriver and pulling the gear away. 3 Remove the Exit Roller Assembly by pressing the small, white tab upward (Figure 6-18, callout 1) and rotating it around (Figure 6-18, callout 2). Note While the shape of the white tab was changed for the HP LaserJet 6L, these procedures for Fuser Exit Roller Assembly removal remain unchanged. Figure 6-18 shows the white tab from an HP LaserJet 5L. 4 Slide the Exit Roller Assembly forward and out to the right of the printer. Figure 6-18 Fuser Exit Roller Removal 6 - 22 Removal and Replacement Paper Exit Sensor Flag Removal and 6 Replacement 1 Remove the Printer Covers, Delivery Assembly (Figures 6-9 and 6-10), and Fuser Pressure Plate (Figure 6-11). Caution Before proceeding to Step 2, examine the Paper Exit Sensor flag. It is important to note the position of the spring mechanism on the flag. [. . . ] · Connect the equipment into an outlet on a circuit different from that to which the · Consult the dealer or an experienced radio/TV technician for help. Any changes or modifications not expressly approved by Hewlett-Packard could void the user's authority to operate this equipment. Note receiver is connected. Use of a shielded interface cable is required to comply within the Class B limits in Part 15 of FCC rules. VCCI Statement (Japan) The VCCI statement below is required in Japan. It is similar to the FCC regulatory statement. Figure B-1 VCCI Statement (Japan) B-4 Regulatory Information C Service Notes Fuser Accordian Jams C3941A-01 SERVICE HP C3941A LaserJet 5L Serial Numbers: <JPBB022333 <JPTB000101 <JPBJ041310 <JPBK006151 <JPBL033831 <JPTJ000101 <JPTK000101 <JPTL000101 <USBB158323 <JPTM080500 <JPBM007279 <JPBT000101 <JPBV000101 <JPTT090666 <JPTV122612 <JPTX029034 LaserJet 5L Printer Fuser Accordion Jams NOTE SUPERSEDES: NONE To Be Performed By: HP-Authorized personnel or Customer Parts required: RB1-7332-000CN output tray fin General Description: Under some conditions the paper can be pushed back down into the fuser. The paper jam can be so severe that the customers cannot remove the paper and the printer requires servicing. [. . . ]

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