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HP Color LaserJet 8550 Series Printer - Cleaning the Printer Components

Introduction
This document provides information about how to clean the printer components. Cleaning procedures are provided for the density sensor, transfer drum, post charger, and the transfer charger on the printer.
Cleaning the density sensor and erase lamp
Clean the density sensor after replacing the imaging drum and when printed colors are inaccurate.
  1. Open the upper door on the right side of the printer.
    Figure : Open the upper door on the right side of the printer
  2. On the inside of the door, locate the density sensor and the density sensor brush. Use the brush to brush off toner particles from the density sensor and the erase lamp. Then replace the brush.
    Figure : Replace the brush
      note:
    You can also use a hand wipe to clean the density sensor. To prevent scratches on the sensor, do not use any paper products, such as tissue or paper towels, to clean the sensor.
  3. Close the upper right door.
Figure : Close the upper right door
Cleaning the transfer drum
Perform these procedures only when there is an unacceptable repetitive defect and the only other solution is replacing the transfer drum. Many, but not all, repetitive defects can be removed using the following procedures. Defects that appear as light spots in dark areas of print are more likely to be corrected by this procedure than dark spots in unprinted areas.
  caution:
If the procedures are performed incorrectly or without proper care, the transfer drum can be permanently damaged.
These procedures require the following items:
  • A print sample showing the repetitive defect
  • A clean, flat surface to work on
  • Isopropyl alcohol
  • A hand wipe
      caution:
    You can also use a dry, clean, soft, lint-free cloth, such as cheesecloth, to clean the transfer drum. To prevent scratches on the drum, do not use any paper products, such as tissue or paper towels, to clean the drum.
    Make sure you have a clean work area free of sharp or rough objects that might damage the drum. To avoid damaging the drum, remove all jewelry and watches before continuing. Contact with any of these items can cause permanent damage.
How to clean the transfer drum
Use the following procedure:
  1. Leave the printer powered on and open the front door of the printer.
    Figure : Leave printer powered on and open front door
  2. Push the white button on the lower (green) lever and swing the lever to the right.
    Figure : Push the white button on the lower (green) lever and swing lever to the right
  3. Open the upper door on the right side of the printer.
    Figure : Open the upper door on the right side of the printer
  4. Using the handles, gently pull out the transfer drum until it stops.
    Figure : Using the handles, gently pull out the transfer drum until it stops
  5. Lift the drum out of the printer.
    Figure : Lift the drum out of the printer
  6. Place the drum on a clean, smooth surface that is free of sharp or rough objects.
  7. Face the drum surface towards you (the handles will be away from you).
  8. Center the print sample beside the transfer drum with the top of the page toward the transfer drum.
    Figure : Center the print sample beside the transfer drum
  9. Using the print sample as a reference, inspect the transfer drum for a small spot or speck that might be causing the repetitive defects.
  10. To locate the spot or speck, you might have to rotate the transfer drum by turning the shiny metal area on either side of the transfer drum surface with your fingers.
    Figure : To locate the speck, rotate the transfer drum
      caution:
    Use extreme care when removing a defect from the transfer drum. Using a sharp object to remove the defect or allowing fingernails or jewelry to touch the transfer drum can scratch the drum, causing permanent damage. Do not clean the transfer drum using force. Do not use any water-based cleaners or excessive alcohol. These actions can permanently damage the transfer drum.
  11. Gently rub the spot or speck with a hand wipe.
    Figure : Gently rub the spot or speck with a handwipe
  12. If the speck does not come off, dampen the hand wipe with isopropyl alcohol. Use the hand wipe to remove the spot or speck from the transfer drum.
      note:
    If you used isopropyl alcohol to clean the transfer drum, you might need to print 50 to 100 pages to clean any residual isopropyl alcohol from the transfer drum.
      note:
    In certain areas of California, air pollution control regulations restrict the use of liquid Isopropyl Alcohol (IPA) as a cleaning agent. In those areas of California, please disregard the previous recommendations and use a dry, lint-free cloth. The cloth may be moistened with water if desired.
  13. To reinstall the transfer drum, align the arrows on the ends of the drum with the matching arrows on the tracks inside the printer.
    Figure : Step 13: Align the arrows on the ends of the drum with those on the inside tracks
  14. Push the drum into the printer. Be sure both sides are inserted completely.
    Figure : Push the drum into the printer
  15. Swing the lower (green) lever to the left, making sure it clicks into place.
    Figure : Swing the lower (green) lever to the left, and click it into place
  16. Close the right and front doors.
    Figure : Close the right and front doors
  17. When the printer control panel displays READY, reprint the print job to verify the repetitive defect has been eliminated.
If cleaning does not eliminate the repetitive defect, contact a local authorized HP dealer or service representative for service.
Cleaning the post charger
Clean the post charger on the transfer drum if there are light streaks in halftone areas.
  1. Open the right upper door.
    Figure : Open the right upper door
  2. Locate the post charger unit cleaner by the transfer drum handle.
    Figure : Locate the post charger unit cleaner by the transfer drum handle
  3. Slide the post charger unit cleaner across the bar several times.
  4. Push the cleaner back into place (it is in place when pushed to the far right).
  5. Close the right upper door.
Cleaning the transfer charger
Clean the transfer charger when irregular wavy patterns appear in solid backgrounds.
  1. Open the front door.
    Figure : Open the front door
  2. Locate the knob below the transfer charger.
    Figure : Locate the knob below the transfer charger
  3. Pull the knob out and push it back in.
    Figure : Pull the knob out and push it back in
  4. Close the front door.
    Figure : Close the front door

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