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What I am getting from your question is that you have thread caught in the upper tension assembly? If this is the case I would remove the top plastic lid on the machine. It's easy to remove as it is only held on by 2 torx head screws. Also remove the plastic end cap on the machine. Just one torx head screw holds on the end cap cover. Now with these two covers removed you can see the entire upper thread path and pull out or remove the thread from where it is caught. On a 180 it usually gets cought at the end of the take up arm where the thread passes through. Use some good tweezers to remove any cought thread. Also turn the hand wheel and inspect the moving parts for any thread that has broken off and gotten wrapped up in the moving parts.
That's tough. You need to remove the plastic liner to get access to the connectors: Remove all black screws off the plastic liner. Remove small plastic cover at middle brake light using a small flat screw-driver. Remove the yellow screw and the 3 black ones. This will relief the middle brake box. You can unplug it (quarter-turn anti-clockwise) to ease further tasks. Unclip the two narrow plastic covers on the side of the hatch back. Proceed bottom to top. There are 3 clipping slots. I broke the middle one on each... Now you can unclip the big liner: there are 4 or 6 clipping slots at the bottom only. When you feel there is no more clip engaged, push the liner up. Unclipping is the toughest... Don't be affraid! There are screws if you brake one, anyway. Enjoy the Korean engineering as I just did!
Remove screw off striker plate at door latch and pull plastic off. Unscrew lock knob. Pull off plastic around door handles. Remove bolt from top of handle. Pull off side mirror cover. Lift and wiggle the panel up and off watching that the hole around handle doesnt get caught.
front panel has one phillips screw in it. remove the air filter and you will see it. Once you remove the screw, grasp the lower front sides of the cover, where the plastic meets the metal, and gently pry it outwards and towards you. there are plastic clips that hold the cover in place. One on each lower side and three on top.
Look for any small rips of paper caught in a sensor back there. There are little "fingers" that the paper runs over and its all timed. if one of those sensors are jammed with something or sticky, error messages.
usually there are screws on the bottom, normally 6-12 screws. Once they are out, there may tabs on the outside of the base fram, lightly use two flat head screw drivers and pull the cover away from the base.. be gentle as this plastic is thin, and could break. You will also need to make sure that the handle assembly is in the down position as the cover can get caught up in the handle when you try to remove it.
there are 11 screws that hold the regrigerator cover on. the light cover is the easist because it snaps in besides the 1 screw in the middle, the htere are 4 mre that have to caosnm e out behind the ligeht cover. then thered are two in the middle that are covered with aa blank offf cover. the htere's the 2 for the resevour and finally the two on the bottom
Take the top off and clean the underside of glass as well as the mirrors on the scanner. Remove the bulbs. This is a light job but not for the mechanically impaired. If you have a 7110, take the ADF off by lifting 2 black inserts near the hinges. Remove 3 screws - 2 near ADF hinges and one on the right.
- Pop off the button cover.
- Remove button assy by sliding right, lift up and pull forward. Remove cable and 2 screws in view.
- Pop off the front plastic piece that the button assy. rested on.
- Remove 1 or 2 screws on the underside center of the top glass assy.
- Open printer exposing the print area and remove the front hinges on the bottom by moving the tabs on left and right side of both hinges.
- Remove a few screws holding the top cover in place.
Cleaning the mirrors.
- Remove the top plastic cover on scanning assy by inserting a small flat blade on the left and right (just behing the lights) and release tabs. Lift front upward till rear tabs are free.
- Remove the bulb toward the middle of the scanner assy. by unplugging, unsnake wire and lift up only that end enough to clearing so you can slide the other end out.
- Remove screw holding dont the clear plasic guide.
- Unplug the other light and unsnake wire. Lift that end up only until the clear plastic piece clears guides and then slide both plastic and light until the other end of the light is free.
Clean mirrors carefully and wipe bulbs carefully
get your Dell manual out and look in the index for lcd cover. It should tell you how to take it off and maintain it. If things get behind it it should be removable. Also www.dell.com is very informative with their support group.