Intro: Cleaning the Underside of an HP's Scanner Glass
This is instructions on how to disassemble the top portion (scanner and Document Feed) of an HP Laserjet 3030.
The problem: Photo scans were having streaks in the image.
Cause: Wires connected to the scanner element dragging across the glass - these wires appear to be coated with some sort of light lubricant
Solution: Disassemble -- clean glass
T-10 Torx Bit <--- if you're buying a torx set, I recommend that you buy a tamper evident set just in case you need that feature later ;)
Awl or something with a pointy edge
Glass Cleaner and chamois
Step 1: Remove Screws and Keypad Cover
Turn off and unplug your machine ;)
There are 5 T-10 torx screws that need to be removed -- see photo notes below. Remove them and store in a safe place.
The keypad cover is held in by friction and several tabs located at the top of the pad. Pry from the bottom of the cover and lift straight up. When the pad releases - pull up and away (towards your body) and guide the keypad off.
You'll notice that my machine is still on at this time. I was hoping I would not need to remove anything wire harnesses and keep the machine running while I did the fix (my parent's business needs this machine up to receive faxes).
Step 2: Removing the Keypad and Keypad Harness
Sorry for the blurry image. First -- locate the two tabs on the very ends of the keypad. The scanner bed locks into here. Press the lower portion of the tab down - you may hear a click.
Note the "hook-like" plastic tab and plastic nub (that locks into the tab) below the lcd panel and to the left of my dirty finger (sorry -- from oil change to scanner repair man). Push the tab up and slide the keypad to the left.
Now, gently pull straight up and locate the ribbon harness. Gently pull the ribbon harness out of the keypad. The plastic holder stays in place. Only the ribbon can be removed. Set the keypad aside.
Step 3: Remove the Scanner Bed
On the left side of the scanner bed is the document feed scanning area. One of the removed torx screws holds own a plastic plate covering a small piece of glass (about 1 inch wide).
Remove the plastic piece and then gently remove the glass. When reinstalling later -- the glass must first go against the black plastic holder and then gently pressed into the gray cross beam.
With your awl -- press in the locking tab in front of the scanner bed. Once this is released - the upper bed can be removed. Close the scanner top and release the two snap tabs. Now, gently pull straight up. We can not remove the document feed harness (easily) at this time - so be aware.
You may have trouble with the back left corner. I beleive the document feed harness gets stuck. Just help it through the plastic slot and it should release easily. Do not force this component out -- after fiddling with it, this part came out VERY SMOOTHLY.
Once the scanner bed is out -- pull out some of the feed harness. It is pushed into the back of the lower scanner bed and comes up easily. You only need to remove a few inches.
Flip the upper assembly and gently rest in the lower scanner bed. Be aware of the scanning element et. al.
Next, we will remove the glass for cleaning.
Step 4: Removing and Cleaning the Glass
The glass is pressed into its holder. There are two locking tabs and two holding tabs.
Using your awl carefully press in on one of the locking tabs while gently prying up on the glass. You only want the glass to lift up a millimeter or two. Now repeat on the other side. Going back and forth, repeat on each tab until the glass is released. No pull out of the two holding tabs and the glass is removed.
Clean with your favorite glass cleaner and a chamois or other non dust making cloth. Once you are done cleaning -- handle only be the glass edge.
Rinse the glass with water and then rubbing alcohol to remove any dust. <-- the water removes any dust and the rubbing alcohol displaces the water and evaporates fast.
Replace the glass by sliding into the holding tabs and then gently and with even pressure snap into the locking tabs. Reassemble reverse of disassembly.
If you were meticulous and anal about your work, you scanned images should be clear again. If you left any dust behind or went cheap on cleaning materials (like using a paper napkin etc.) -- you scanned images will still have contaminants in them.