How do I remove the scanning glass in order to clean it from the inside?
For some reason my scanner over the years has developed a film/residue from the off gassing of the plastic etc. on the underside of the glass. Even though it did not seem to affect the quality of a scan, it was something that should not be present.
Here are the steps that I went though to accomplish that....
1) lock the lamp (switch on the bottom)
Very good idea.
2) open the lid and at the hinge end there are 3 screws (2 are recessed) & another screw in the middle.remove the 2 screws that are recessed (The one in the middle can remain in place.)
Warning: This cable is attached to a little PCB that has two connectors. It is best that you remove the cable on the scanner base side, since it is easier to re-insert back into the connector.
Note: That there are slots in the PCB that are to align with slots in the plastic that make up the base (will talk to this later).
3) After removing the two screws, the tricky part starts - the lid and glass and framing around the glass ( 3
sides) can slide out toward the back (toward the screws (that you just removed), lid hinges). This should Only
slide out approx 0.75in before the glass & frame are free of the bottom assy.
Note: the glass continues under the front bezel for approximately 0.75" 18-19mm. This is the reason that you are required to slide the assy. off the base.
Note: near the hinges the lid assy. is rather flexible so the following is possible. This sliding process that I & the previous writer write about is extremely hard. What I did was to take a very wide flat screw driver and used it as a pry bar.
Note: that there are tabs that have to clear the opening that you create when trying to insert the flat screw driver.
This enabled me to get a great deal of mechanical advantage over the process. I placed the scanner on it side
with the bottom facing me. Then I placed the tip of the screw driver against the hinge ( inside the scanner, part of the lid assy.) and used the base where the hinge is normally located (when assembled) as the pivot point.
Note: Go from one hinge point to the other and continue to use this method until the lid assy. is free.
Note: I only slid the lid assy. out approx. 1/8" or 3mm or less before going to the other hinge & repeating the process.
Note: after the lid w/glass assy. is free pivot the whole assy. at the hinge side to gain access to the base cable & disconnect it from the PCB.
Warning: The cable from the base to the lid (PCB) needs to be disconnected since there is not a great amount of free length of cable to work with and this cable is a great deal easier to reconnect during re-assembly than the one from the lid.
4) At this point the glass & lid assy. are free of the base assy.
5) clean the glass. It is glass, so one can use isopropol alcohol or distilled water.
Use a lent free cloth and make sure all the dirt, and deposited vapor/off gassing is cleaned off.
6-9) Reverse steps 4 through 1 to reassemble.
Note: I did not reverse those steps since it was not necessary. What I did was at a very slight angle slide the glass under the front bezel.
Note: I first made sure that the cables (lid & base) were connected to the PCB, & as I was sliding the lid assy. into position. I also made sure that the PCB slots were properly aligned to the plastic slots in the base assy.
Note: I did not worry about if the clips on each side were engaging or not. This enable me to make sure that the cables were attached & that the PCB was positioned properly. After everything looked good I pressed the Lid assy. & base together so as to engage the clips on both sides. This does not require a great amount of force/pressure to accomplish.
Warning: Do not forget to unlock (the slide switch for) the lamp.
10) Clean the top surface same as step 5 (prior to plugging it back in of course).
Hope this helps.
Mar 01, 2012 |
Canon CanoScan 4400f MultiFunction Color...