At the top of the presser bar, there seems to be a channel in which a metal piece moves in and out depending upon the position of the presser bar. However, this metal piece seems to be missing and the clear plastic piece which is attached to the spring doesn't move at all with the bar. I tried putting a screwdriver in between this channel to flag the sensor and that didn't make the message go away. Basically, the position of the presser foot doesn't affect the movement of any other parts and in examining other sensors behind the lamp cover, there should be a piece that is within this channel that flags the presser bar sensor so that the machine knows it is up or down. 
This would be most likely the sensor.
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SOURCE: how to put on presser foot "p" to embroider
Not shure you can embroider on an MC4000, i think this is only a sewingmachine.
But to change presser fot:
If it a "snap on" foot, when foot lifted, press the "button" on the back of the needle bar (on the bottom) this would release the presser foot.
If is a large foot, you have to unscrew the screw on the left side of the needlebar, and change the whole foot.
SOURCE: I need to replace the metal bar that snaps onto the presser foot.
If you go to the Janome website of your home country they will have a dealer locator page where you can find your nearest dealer.
Explain the problem and they will be able to order the replacement part for you.
You may find that parts availability at this time of year will be restricted as many businesses and suppliers close for several weeks.
SOURCE: The top spool of thread jams tight when I pull the
It sounds like the tension setting is too tight. The tension mechanism consists of two metal disks; the thread runs between these disks. When the pressure foot is down, the disks come together, trapping the thread between them. When the pressure foot is up, the disks separate and the thread can flow freely. (BTW, this is why you adjust the tension with the pressure foot down.)
Take a look at your tension setting and try loosening it. That should resolve the problem.
Let me know if this helps, ok?
Robbie
SOURCE: I've lost the 'foot holder' (that holds the
try www.sewingpartsonline.com for replacement parts
http://www.sewingpartsonline.com/presser-foot-shank-elna-janome-kenmore-804509000.aspx looks like it is the one you need I think.
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