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HP Scanjet 2300c and 3500c Series - Cleaning the Underside of the Scanner Glass and the Transparent Material Adapter (TMA)

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.
  caution:
Disassemble the scanner in a relatively clean, dust-free space.
For instructions on cleaning the underside of your scanner glass, click on the name of your scanner model:
Figure : HP Scanjet 2300c scanner
Figure : HP Scanjet 3500c series scanner
HP Scanjet 2300c scanner
  note:
Before proceeding, read these instructions all the way through. Then return here and follow the steps in order.
This module is organized into the following sections:
  • Preparation
  • Disassembly
  • Cleaning
  • Reassembly
Preparation
Tools needed:
  • Flat-head screwdriver
Supplies needed:
  • Glass cleaner
  • Lint-free cloths
  1. Disconnect the USB cable between the scanner and the computer.
  2. 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.
Disassembly
Remove the scanner lid
After disconnecting the scanner from the computer and from the power supply, and letting it cool for 15 minutes, you can remove the lid as shown.
  1. Open the lid and lift it straight up.
    Figure : Scanner lid being removed
  1. Scanner components:
  2. 1- Scanner lid
  3. 2- Scanner top cover
  1. Set the lid aside.
Clean top of scanner
Clean the outside of the scanner prior to disassembly to prevent contamination of internal parts.
  caution:
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. Do not spray the glass cleaner directly on the glass. Do not allow the cleaner to pool or run over the edges of the glass. If cleaner runs over the edge of the glass it could stain the calibration strip (the white strip under the glass) and render your scanner useless. If the cleaner gets in the calibration strip area, the scanner must be sent to HP for repair.
  1. Apply glass cleaner to a soft lint-free cloth. Clean the plastic first.
  2. Apply glass cleaner sparingly to a separate cloth and clean the glass.
Unlatch the top cover
After disconnecting the scanner from the computer and from the power supply, and cleaning the top of the scanner, you can begin disassembly.
  caution:
You are about to expose the interior of the scanner to the dust of the outside environment. The scanner is very sensitive to dust; any dust particles that get into the carriage head can cause streaks in the scanned image. Minimize the time that the top cover is off by having all the cleaning materials ready. Also be sure to disassemble your scanner in a clean environment.
  caution:
Do not touch any other parts inside the scanner. Some parts of the scanner are very sensitive, especially to electrostatic discharge.
  1. While lifting up the top cover, insert a flat-head screwdriver into one of the two scanner lid mounting holes and unlatch the tab inside the hole. To unlatch the tab push it forward (toward the front of the scanner where the buttons are) with the screwdriver. When the tab is depressed, gently lift the top cover to prevent it from re-latching. Follow the same procedure to unlatch the other side.
Figure : Top cover being unlatched
Remove the top cover
After unlatching the top cover, you are ready to remove it.
  1. Lift the back of the top cover first. (The back is the end opposite from the front panel with the buttons).
  2. Lift the cover toward the front and then lift it up to remove it, as shown.
Figure : Top cover being lifted up
  1. 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. Static discharge from your fingers, hand, or tools will damage the circuit boards inside your scanner. Do not touch anything inside the scanner base.
Cleaning
Clean the glass
You are now ready to clean the underside of the glass.
  caution:
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. Do not spray the glass cleaner directly on the glass. Do not allow the cleaner to pool or run over the edges of the glass. If cleaner runs over the edge of the glass it could stain the calibration strip (the white strip under the glass) and render your scanner useless. If the cleaner gets in the calibration strip area, the scanner must be sent to HP for repair.
Apply glass cleaner sparingly to a soft, lint-free cloth and clean the glass.
Reassembly
Re-mount the top cover to the scanner
When you have finished cleaning the underside of the glass, reassemble the top cover.
  1. Identify where the front tabs of the top cover are located, as shown.
  1. Identify where the base mounts are located, as shown.
Figure : Base mounts
  1. Holding the top cover with the back end raised slightly, align the front tabs of the top cover with the base mounts.
Figure : Top cover aligned with base
  1. Lower the back end of the top cover to the base and snap them together by squeezing the base and top cover together.
Figure : Top cover being remounted on base
Insert the scanner lid
You can now re-insert the scanner lid, with the lid in the open position.
  1. Align the lid hinges with the slots of the top cover and slide them in.
    Figure : Scanner lid being re-inserted in scanner
  1. Scanner components:
  2. 1- Scanner lid
  3. 2- Scanner top cover
  1. Close the scanner lid.
Reconnect the scanner
You can now reconnect the USB cable and the power supply to the scanner.
For instructions on connecting the cables see the setup instructions that came with your scanner.
HP Scanjet 3500c series scanner
  note:
Before proceeding, read these instructions all the way through. Then return here and follow the steps in order.
This module is organized into the following sections:
  • Preparation
  • Disassembly
  • Cleaning
  • Reassembly
Preparation
Tools needed:
  • Phillips screwdriver (6 mm or #1 preferred)
Supplies needed:
  • Glass cleaner
  • Lint-free cloths
  1. Disconnect the USB cable between the scanner and the computer.
  2. 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.
Disassembly
Remove the scanner lid
After disconnecting the scanner from the computer and from the power supply, and letting it cool for 15 minutes, you can remove the lid as shown.
  1. Open the lid and lift it straight up.
    Figure : Scanner lid being removed
  1. Scanner components:
  2. 1- Scanner lid
  3. 2- Scanner top cover
  1. Set the lid aside.
Clean top of scanner
Clean the outside of the scanner prior to disassembly to prevent contamination of internal parts.
  caution:
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. Do not spray the glass cleaner directly on the glass. Do not allow the cleaner to pool or run over the edges of the glass. If cleaner runs over the edge of the glass it could stain the calibration strip (the white strip under the glass) and render your scanner useless. If the cleaner gets in the calibration strip area, the scanner must be sent to HP for repair.
  1. Apply glass cleaner to a soft lint-free cloth. Clean the plastic first.
  2. Apply glass cleaner sparingly to a separate cloth and clean the glass.
Remove the fastening screws
After disconnecting the scanner from the computer and from the power supply, and cleaning the top of the scanner, you can begin disassembly.
  caution:
You are about to expose the interior of the scanner to the dust of the outside environment. The scanner is very sensitive to dust; any dust particles that get into the carriage head can cause streaks in the scanned image. Minimize the time that the top cover is off by having all the cleaning materials ready. Also be sure to disassemble your scanner in a clean environment.
  caution:
Do not touch any other parts inside the scanner. Some parts of the scanner are very sensitive, especially to electrostatic discharge.
  1. Turn the scanner upside down on a clean surface.
  2. Using a 6-mm Phillips or a #1 screwdriver, remove the three screws from the bottom, in the locations shown below.
Figure : Location of screws on bottom of scanner
Remove the top cover
  1. Holding the top and bottom covers together, turn the unit over so that the glass side is facing up.
  2. Lift the front of the top cover, as shown. The front is where the buttons are located.
Figure : Top cover being lifted
  1. Lift the cover straight up to remove it. The button panel may come off during this operation; set it aside for assembly later on.
  2. 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. Static discharge from your fingers, hand, or tools will damage the circuit boards inside your scanner. Do not touch anything inside the scanner base.
Cleaning
Clean the glass
You are now ready to clean the underside of the glass.
  caution:
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. Do not spray the glass cleaner directly on the glass. Do not allow the cleaner to pool or run over the edges of the glass. If cleaner runs over the edge of the glass it could stain the calibration strip (the white strip under the glass) and render your scanner useless. If the cleaner gets in the calibration strip area, the scanner must be sent to HP for repair.
Apply glass cleaner sparingly to a soft, lint-free cloth and clean the glass.
Reassembly
Re-mount the top cover to the scanner
When you have finished cleaning the underside of the glass, reassemble the top cover.
  1. If the button panel came off during disassembly, install it by first locating the positioning tabs on the bottom of the button panel and the base of the scanner.
Figure : Location of tabs on base and button panel
  1. Align the tabs on the bottom of the button panel to the tabs on the base and rotate the button panel into position as shown.
Figure : Button panel being installed
  1. Hold the top cover with the front end raised as shown.
Figure : Top cover being positioned over base
  1. Align the hooks on the top cover to fit under the hooks in the base.
Figure : Hooks on top cover
Figure : Hooks on bottom cover
  1. Snap the top cover and the base together.
Insert the screws
  1. Holding the top cover and the base together, then turn the scanner over so that it is upside down.
  2. Re-insert and tighten the three screws with a Phillips screwdriver.
Figure : Location of screws in bottom of scanner
Insert the scanner lid
You can now re-insert the scanner lid, with the lid in the open position.
  1. Turn the unit over so that the glass side is facing up.
  2. Align the lid hinges with the slots of the top cover and slide them in.
    Figure : Scanner lid being re-inserted in scanner
  1. Scanner components:
  2. 1- Scanner lid
  3. 2- Scanner top cover
  1. Close the scanner lid.
Reconnect the scanner
You can now reconnect the USB cable and the power supply to the scanner.
For instructions on connecting the cables, see the setup instructions that came with your scanner.
Clean the TMA
Clean the TMA with a dry, soft cloth. If necessary, lightly spray the cloth with window cleaner or isopropyl alcohol.

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