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HP Laserjet 5 Service Manual

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    							General Timing Diagram - HP LaserJet 5L
    Figure 5-7
    5 - 20 Functional Overview 
    						
    							General Timing Diagram - HP LaserJet 6L
    Figure 5-8
    5
    Functional
    Overview
    Functional Overview 5 - 21 
    						
    							5 - 22 Functional Overview 
    						
    							6
    Removal and Replacement
    Contents
    Removal and Replacement Strategy .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 6-3
    Required Tools . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 6-4
    Installing Memory Cards (DRAM) .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 6-5
    Covers and Doors . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 6-6
    Back Cover . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 6-6
    EP Door Assembly . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 6-8
    Memory Door .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 6-9
    Main Cover and Paper Input Assembly .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-10
    Internal Assemblies .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-11
    Control Panel .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-11
    Exit Roller Assembly .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-12
    Delivery Assembly . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-13
    Fuser Pressure Plate .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-15
    Heating Element .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-17
    Pressure Roller . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-20
    Face-Up/Face-Down Lever . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-21
    Fuser Exit Roller Assembly .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-22
    Paper Exit Sensor Flag . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-23
    Top Assemblies .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-24
    Laser/Scanner Assembly .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-24
    Solenoid . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-25
    Pickup Roller Assembly .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-27
    Paper Feed Frame .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-30
    Transfer Roller Guide & Transfer Roller .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-34
    Kick Plate .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-35
    Separation Pad . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-37
    Subpads . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-38
    Feed Assembly . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-39
    Bottom Assemblies .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-42
    Memory Door Guide .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-42
    Motor .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-43
    DC Controller .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-44
    Formatter Board .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . 6-47
    Removal and Replacement 6 - 1 
    						
    							6 - 2 Removal and Replacement 
    						
    							Removal and Replacement Strategy
    This chapter documents removal and replacement of Field Replaceable Units
    (FRUs) only. Exchange assemblies should be sent to SMO for repair.
    Replacement is generally the reverse of removal. Occasionally, notes are included to
    provide direction for difficult or critical replacement procedures.
    WARNING!Unplug the power cord from the power outlet before attempting to service the
    printer. If this warning is not followed, severe injury may result.
    Never operate or service the printer with the protective cover removed from the
    Laser/Scanner Assembly. The reflected beam, although invisible, can damage your
    eyes.
    The sheet metal edges of this printer can be sharp! Exercise caution when working
    with the printer.
    CautionThe printer contains parts that are electrostatic discharge (ESD) sensitive. Always
    service printers at an ESD-protected workstation.
    To install a self-tapping screw, first turn it counter-clockwise to align it with the
    existing thread pattern, then carefully turn clockwise to tighten. Do not overtighten.
    If a self-tapping screw-hole becomes stripped, repair the screw-hole or replace the
    affected assembly.
    NoteAlways remove the toner cartridge before removing or replacing parts.
    6
    Removal and
    Replacement
    Removal and Replacement 6 - 3 
    						
    							Required Tools
    ·#2 Phillips screwdriver with a magnetic tip
    ·5.5 mm hexhead nutdriver
    ·small flathead screwdriver
    ·needlenose pliers
    CautionA Posidriv screwdriver will damage the printer’s screw heads. Use Phillips only.
    Figure 6-1 shows the difference between a Phillips and a Posidriv screwdriver. Note
    that a Phillips tip has more beveled surfaces.
    Phillips and Posidriv screwdrivers
    Figure 6-1
    6 - 4 Removal and Replacement 
    						
    							Installing Memory Cards (DRAM)
    1Unplug the power cord from the printer. You
    should not install a memory card while the
    printer is in SleepMode.
    2Open the Printer Door, remove the toner
    cartridge, and close the Printer Door. Protect
    the toner cartridge from light while you are
    working on the printer.
    3Remove any paper in the paper tray. Gently
    tip the printer onto its side so that the memory
    cover is on top as shown in Figure 3.
    4Remove the Memory Expansion Cover by
    carefully pulling the tab out and away from
    the printer in a gentle rocking motion.
    5Align the memory card with the corner notch
    so it is positioned as in Figure 4. Push it firmly
    into the printer.
    Replace the Memory Expansion Cover, set the
    printer upright, reinstall the toner cartridge,
    reinsert paper, and reconnect to the power source.
    Print a self-test page (see Chapter 3) to check that
    the printer recognizes the additional memory you
    have added. Your Total Memory in the “Printer
    Information” section will show the new MB total.
    1 MByte card 2 MByte total
    2 MByte card 3 MByte total
    4 MByte card 5 MByte total
    8 MByte card 9 MByte total
    6
    Removal and
    Replacement
    Removal and Replacement 6 - 5 
    						
    							Covers and Doors
    Back Cover
    1Unplug the power cord and remove the parallel cable from the back of the printer.
    2Remove the toner cartridge.
    3Lift the Input Extender assembly.
    CautionYou must lift the Input Extender when the covers are removed or it will break. After
    you have removed the covers, leave the Input Extender in this lifted position for
    ease of replacement.
    4Remove the (3) screws (Figure 6-2, callout 1).
    Back Cover Removal (1 of 2)
    Figure 6-2
    6 - 6 Removal and Replacement 
    						
    							5Separate the rear panel from the main cover, pulling the lower corners away from
    the printer first. Then, insert the small flathead screwdriver into the openings at the
    top to pop the upper corners (Figure 6-3, callout 1).
    6Remove the cover by grabbing it on both sides and pulling it straight back with a
    firm pull (Figure 6-3, callout 2).
    Back Cover Removal (2 of 2)
    To reinstall
    Make certain the Input Extender is up.
    Figure 6-3
    6
    Removal and
    Replacement
    Removal and Replacement 6 - 7 
    						
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