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HP LaserJet II, IID, III, and IIID Series Printers - Cleaning the Printer

Issue:
How often should the HP LaserJet II, IID, III, and IIID printers be cleaned? What parts of the printer need to be cleaned?
Solution
To clean the HP LaserJet II, IID, III, and IIID printers, follow the steps listed below. Read all warnings and cautions prior to cleaning a particular printer area.
 warning:
Failure to turn the printer off (and unplug the power cord) before cleaning the interior or any area may result in personal injury or in damage to the printer.
General cleaning
  1. Turn the printer off and unplug the power cord.
  2. Open the printer top cover.
  3. Using a water-dampened, lint-free cloth, clean the inside of the printer by wiping away any visible toner.
Cleaning the transfer corona wire
The transfer corona is a thin wire strung lengthwise through the corona casing area. This wire must be clean to ensure that the image written on the electrophotographic drum properly transfers to the paper. Refer to the User's Manual for help in determining the location of the transfer corona wire and surrounding areas.
 caution:
Use care not to break the plastic support wires that cross above the transfer corona wire. They prevent paper from inadvertently going into the casing and causing paper jams. Also, use care not to break the corona wire. If the corona wire breaks, the printer cannot transfer print images to paper.
  1. Switch the printer off and unplug the power cord.
  2. Open the printer's top cover.
  3. Use a cotton swab dipped in isopropyl alcohol or water. Make sure the swab is not soaked. Keep the alcohol away from rollers and plastic parts. Clean the following areas:
    1. The orange pads at each end of the transfer corona wire
    2. Along the back of the transfer corona casing
    3. Under the plastic lip (along its length)
       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.
  4. Clean the entire transfer corona wire (top, bottom, and sides) along the length with a clean cotton swab until no residue remains.
Cleaning the transfer guide and lock tray
A dirty transfer guide area causes smudging on the back of printed output. Follow the steps below for cleaning the transfer guide area and surrounding area:
  1. Switch the printer off and unplug the power cord.
  2. Open the printer's top cover.
  3. Using a water-dampened cloth, wipe any residue off the silver metal strip (transfer guide).
  4. Wipe paper dust or residue off the transfer guide roller and the top of the transfer guide lock tray.
  5. Open the transfer guide lock tray by lifting its green handle.
  6. Wipe off the inner silver and brass colored metal strips.
  7. Close the transfer guide lock tray.
Cleaning the paper feed guide
Use a water-dampened cloth to wipe off any dust or dirt from the paper feed guide. Avoid touching the adjacent fusing area; it may be hot. Refer to the product User's Manual to locate the paper feed guide.
Cleaning the primary corona wire
The primary corona wire is located inside the EP-S print cartridge. Because the primary corona is delicate, it should be cleaned only when there is a print quality problem (usually, dark vertical streaks on the page).
  1. Switch the printer off and unplug the power cord.
  2. Open the printer's top cover.
  3. Remove the print cartridge from the printer.
  4. Lift out the green cleaning brush.
  5. Carefully insert the felt-tipped end of the brush in one end of the print cartridge slot. The felt-covered side of the brush should face the label side of the cartridge. See the printer User's Manual for more information.
     caution:
    Clean the primary corona wire carefully, using only the cleaning brush provided with the printer. Do not use a cotton swab or other cleaning tool. If the wire breaks, the print cartridge must be replaced. Do not lift the protective drum flaps in an attempt to insert the brush. Doing so may damage the cartridge rollers.
  6. Slide the brush back and forth a few times to clean the primary corona wire.
  7. Remove the brush and return it to its holder in the printer.
  8. Return the print cartridge to the printer.
Summary
To maintain print quality, these printers should be cleaned:
  • At least once a month (more often for high usage)
  • Every time that the print cartridge is replaced
  • After printing 4,000 single-sided pages (or 2,000 duplex)
  • Whenever print quality problems occur

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