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HP P3015 Service Manual

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    							Image formation process
    Each of the following process function independently and must be coordinated with the other product
    processes. Image formation consists of the following processes:
    ●Latent-image formation block
    ◦Step 1: primary charging
    ◦ Step 2: laser-beam exposure
    ● Developing block
    ◦Step 3: developing
    ● Transfer block
    ◦Step 4: transfer
    ◦ Step 5: separation
    ● Fusing block
    ◦Step 6: fusing
    ● Drum cleaning block
    ◦Step 7: drum cleaning
    Figure 1-17   Image formation process
    Drum cleaning Developing
    2. Laser-beam exposure
    Fusing (Fixing)
    6. Fusing (Fixing)
    Delivery 7. Drum cleaning
    3. Developing
    1. Primary charging
    Pickup
    4. Transfer
    5. Separation
    Transfer
    Latent image formation
    : Media path
    : Direction of drum rot ation
    : Block
    : Step
    ENWW Image-formation system 27 
    						
    							Latent-image formation stage
    During the latent-image formation stage, the laser/scanner forms an invisible image on the
    photosensitive drum in the print cartridge.
    Primary charging Step 1: DC and AC biases are applied to the primary charging roller, which transfers a uniform negative
    potential to the photosensitive drum.
    Figure 1-18   Primary charging
    Primary charging bias
    Photosensitive drum
    Primary charging roller
    Laser beam exposure
    Step 2: The laser beam scans the photosensitive drum to neutralize negative charges on parts of the
    drum surface. An electrostatic latent image is formed on the drum where negative charges were
    neutralized.
    Figure 1-19   Laser beam exposure
    Laser beam
    Unexposed area Exposed area
    28 Chapter 1   Theory of operation ENWW 
    						
    							Developing stage
    Print cartridgeStep 3: In the print cartridge, the developing cylinder comes in contact with the photosensitive drum to
    deposit toner onto the electrostatic latent image.
    Figure 1-20   Print cartridge
    Blade
    Photosensitive drum
    Unexposed area
    Exposed area Unexposed area
    Exposed area
    Developing roller
    Developing bias
    Toner acquires a negative charge from the friction that occurs when the developing roller rotatesagainst
    the developing blade. The developing bias is applied to the developing roller to make a potential
    difference between the developing roller and the photosensitive drum. The negatively charged toner is
    attracted to the latent image on the photosensitive drum because the drum surface has a higher
    potential.
    ENWW Image-formation system 29 
    						
    							Transfer stage
    Step 4: The transfer charging roller, to which a DC positive bias is applied, imparts a positive charge
    on the print media. When the print media comes in contact with the photosensitive drum, the toner is
    transferred to the print media.
    Figure 1-21   Transfer
    Media
    Transfer roller Photosensitive
    drum
    Transfer bias
    Step 5 : 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 1-22   Separation
    Media
    Transfer roller
    Photosensitive
    drum
    Static charge eliminator
    Fusing stage Step 6: 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.
    30 Chapter 1   Theory of operation ENWW 
    						
    							The product uses an on-demand fuser method. The toner image is permanently affixed to the printing
    paper by heat and pressure.
    Figure 1-23  Fusing
    Media
    Toner
    Fuser film Fuser heater
    Pressure rollerBrush
    Fuser bias
    Cleaning stageStep 7: The cleaning blade scrapes the residual toner off of the photosensitive drum and deposits it into
    the waste toner case.
    Figure 1-24   Drum cleaning
    Toner collection box Photosensitive
    drum
    Cleaning blade
    ENWW
    Image-formation system 31 
    						
    							Toner detection
    The product uses a nonvolatile memory tag built into the print cartridge. Print-cartridge detection
    happens when the engine controller detects the presence of a genuine HP print-cartridge that contains
    a memory tag. Toner detection happens as the engine controller reads or writes the data that is stored
    on the memory tag. The engine controller renews the information in the prescribed timing and reads or
    writes it from or to the memory tag.
    The engine controller commands the memory tag to read or write with the following conditions:
    ●Read
    ◦Power is on
    ◦ The cartridge door is closed
    ◦ A command is received from the formatter
    ● Write
    ◦A page of media is printed
    ◦ A command is received from the formatter
    When the engine controller fails to read or write three times in a row, it determines that the memory tag
    is abnormal and sends a cartridge memory abnormality warning to the formatter.
    Figure 1-25   Print cartridge memory tag
    32 Chapter 1   Theory of operation ENWW 
    						
    							Pickup, feed, and delivery system
    The pickup/feed/delivery system consists of several types of feed rollers and sensors. The ECU uses
    a motor and two solenoids to drive the rollers. Three media-detection sensors detect paper as it passes
    through the product. If media does not reach or pass each sensor within a specified time, the ECU
    determines that a jam has occurred and alerts the formatter.
    Paper trays
    The product has the following paper trays:
    ●Tray 1 (multipurpose tray; all models)
    ● Tray 2 (500-sheet tray; all models)
    ● Tray 3 (optional 500-sheet input tray; HP LaserJet P3015x)
    ● Tray 4 (optional 500-sheet input tray)
    ENWW Pickup, feed, and delivery system 33 
    						
    							Photo sensors and switches
    Figure 1-26  Photo sensors and switches (product)
    SW235
    M8001
    M8002PS3
    PS215PS205
    PS502
    PS8001
    PS4
    PS1
    PS2PS225 SW501
    SL1
    SL2
    Table 1-10   Photo sensors and switches (product)
    ItemDescriptionItemDescription
    PS1Face-up sensorPS215Top-of-Page (TOP) sensor
    PS2Fuser delivery sensorPS225Media width sensor
    PS3Cassette media-presence sensorPS502Duplex media-feed sensor (duplex models only)
    PS4Face-down tray media-full sensorPS8001Rear door sensor
    PS205Tray 1 (MP tray) media-presence sensorSW235Cassette presence sensor
    34 Chapter 1   Theory of operation ENWW 
    						
    							Figure 1-27  Photo sensors and switches (Tray 3 and Tray 4)
    PS451
    PS8008
    SL3
    M8001
    SW461
    CL1
    Table 1-11
      Photo sensors and switches (Tray 3 and Tray 4)
    ItemDescription
    PS451Paper feeder cassette-media presence sensor
    PS8008Paper feeder media-feed sensor
    SW461Paper feeder cassette presence switch
    1Tray 3 and Tray 4 are identical 500-sheet input trays.
    ENWW Pickup, feed, and delivery system 35 
    						
    							Solenoids and clutches
    Figure 1-28  Solenoids and clutches (product)
    SL1
    SW235
    SL2
    M8001
    M8002PS3
    PS215PS205
    PS502
    PS8001
    PS4
    PS1
    PS2PS225
    SW501
    Table 1-12   Solenoids and clutches (product)
    ItemDescription
    SL1Tray 1 (multipurpose tray) pickup solenoid
    SL2Cassette (Tray 2) pickup solenoid
    36 Chapter 1   Theory of operation ENWW 
    						
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