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HP Scanjet G4010, G4050, 4070, 4850, and 4890 Scanners - Cleaning the Underside of the Scanner Glass

Introduction
If cleaning the top surface of the scanner glass does not remove all dirt and smudges from the glass, you can also clean the underside of the glass. Cleaning the underside of the glass requires you to disassemble the scanner. This document describes how to clean the under side of the scanner glass.
  note:
Perform this procedure only if it is absolutely necessary.
Cleaning the underside of the glass
Follow the steps below:
Step one: Prepare to clean the glass
Disconnect the USB cable between the scanner and computer and then disconnect the power supply from the scanner.
  caution:
Wait at least 15 minutes after disconnecting power before disassembling the scanner and cleaning the glass. This gives the scanner time to cool.
Tools needed:
  • Phillips screwdriver
Supplies needed:
  • Glass cleaner
  • Lint-free cloths
Step two: Disassemble the scanner before cleaning
  note:
Wait at least 15 minutes after disconnecting the power from the scanner before disassembling the scanner and cleaning the glass. Read all directions and have the necessary tools ready before removing the top cover. While the top cover is off, do not leave the scanner unattended.
  1. After the scanner has cooled for 15 minutes, unplug the Transparent Materials Adapter (TMA), open the lid, and then lift it straight up. Set the lid aside.
      note:
    Clean the outside of the scanner before removing the glass to prevent contamination of internal parts.
  2. Apply glass cleaner to a soft lint-free cloth. Clean the plastic first, and then apply the glass cleaner sparingly to a separate cloth and clean the glass.
      note:
    Use only glass cleaner. Avoid abrasives, acetone, benzene, and carbon tetrachloride, all of which can damage the scanner glass. Avoid isopropyl alcohol because it can leave streaks on the glass.
      caution:
    Do not spray the glass cleaner directly on the glass and do not allow the cleaner to seep between the glass and the plastic. If liquid gets between the glass and the plastic it could stain the calibration strip (the white strip under the glass) and render the scanner useless. If the cleaner gets in the calibration strip area, the scanner must be sent to HP for repair.
  3. Using a Phillips screwdriver, remove the four screws from the bottom of the scanner.
  4. Holding the top and bottom cover together, turn the unit back over so that the glass side is facing up.
  5. Carefully lift the top cover off the base. Lift the top cover straight up off of the base. Turn the top cover upside down and set it on a clean surface.
      caution:
    Dust will immediately begin accumulating in your scanner now that the top cover is off. Minimize the time the scanner base is exposed.
    Static discharge from your fingers, hand, or tools will damage the circuit boards inside your scanner. Do not touch anything inside the scanner base.
Step three: Clean the underside of the glass
Apply glass cleaner sparingly to a soft, lint-free cloth and clean the glass.
  note:
Use only glass cleaner. Avoid abrasives, acetone, benzene, and carbon tetrachloride, all of which can damage the scanner glass. Avoid isopropyl alcohol because it can leave streaks on the glass.
Step four: Assemble the scanner after cleaning
  1. Hold the top cover directly above the scanner and lower it straight on to the base and snap together.
  2. Holding the top and bottom covers together, turn the scanner upside down on a clean surface.
  3. Re-insert and tighten the four screws with a Phillips screwdriver and then turn the unit over so that the glass side is facing up.
  4. Re-insert the scanner TMA with the lid in the open position. Align the lid hinges with the slots of the top cover and slide them in.
  5. Close the scanner TMA and then reconnect the USB cable and the power supply to the scanner.

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