HP P3015 Service Manual
Have a look at the manual HP P3015 Service Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 1114 HP manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
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