Question about Epson Perfection 4990 Flatbed Scanner
I just had this problem too. What has probably happened is that the belt/wheel assembly within the upper lid has broken loose from its plastic housing. It is normally retained in place by two weak plastic posts, each having a plastic extrusion that holds the metal housing for the wheel in place. Just minor stress can apparently snap off the plastic extrusions. (Nice quality workmanship, Epson.)
Unplug the upper lid and remove it. Unscrew the 5 retaining screws and then use a small flathead screwdriver to carefully pry the bottom of the unit away from the rest of the housing. Stabilize the wheel mechanism so that you can rotate the whole unit around in order to grab the broken plastic pieces and small spring without allowing the wheel mechanism to crash into things. Superglue the two broken plastic pieces to their proper mated location on the lid, and wait about half a day for a solid bond. Then fit the wheel housing over the two plastic pieces so that the thin silver bar is pointed toward the back of the lid. (Do NOT place the spring over the thin silver bar yet.) Fit the orange belt properly around the wheel. NOW, push the wheel housing carefully toward the front of the lid until there is slight tension in the belt. Squeeze one end of the spring over the thin silver bar and push the spring completely into its recessed plastic trough while compressing it. Reassemble, and you're done.
Posted on Oct 27, 2010
There is a metal tab bent up at the back of the pulley tension assembly. I drilled two small holes -- 1/16" --- on either side of that metal tab. With my wife's help, I looped and tied a piece of strong nylon thread to hold the assembly in place. Not pretty but works perfectly. I did a video and will upload it to you-tube. search you-tube for "Epson 4990 repair". Or search for my you-tube videos. Brian Kuehn.
Posted on Dec 28, 2013
A question if anyone is still on this thread: I have the same issue. The plastic post that sits in the slot to guide the wheel mechanism has a small hole. Is there any reason NOT to thread a small screw into this hole? Even if the tabs break again it seems this might keep the assembly attached and stable. Thoughts?
Posted on Jun 08, 2013
I have the same problem. The stubs don't look large enough for a strong bond to the tabs, even with crazy glue. Has anyone successfully repaired this problem with crazy glue?
My thought was to build up around the stubs with epoxy, then drill the stubs with a fine bit, and insert screws to hold the pulley's plate. Has anyone tried this and succeeded?
BTW, I agree - poor design. The tabs may be strong enough for zillions of normal scanning operations, but they are too weak to survive one instance of the top cover slamming down hard, or perhaps multiple milder slams.
Posted on May 16, 2013
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Posted on Jan 02, 2017
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