This is not too difficult, assuming its roughly the same as my 312i vaccuum cleaner. I managed it in about an hour of figuring it out (having consulted the web and found your question but with no answer.) I found that the reason for the fault was quite simple: nothing was actually broken. But you'll not know this until you have completed Step 4 below.
You'll need a Philips screwdriver - ideally a magnetic one since there is one screw which is quite difficult to get back in. An ordinary one will do though, with a bit of luck.
Step 1: Identify two screws at the back of the lid by its hinges and between the lid and the on/off switch / retractor pedal switch. Remove them. This will allow you to lift the switch assembly off. (You'll see when you do this that you are removing an internal electrical socket panel as you do this. It is easy to replace later on.)
Step 2: Locate a Philips screw in the main body underneath the switch panel you have just removed. It is located at the bottom of a 'well' at one side. Remove this. (You'll probably have to turn the body upside down so that it drops out if you haven't got a magnetic screwdriver.) There is another Philips screw nearer the middle. You can ignore this one.
Step 3:Open the main body (as if you are replacing the bag). Remove the bag and then unscrew two Philips screws - one either side of the body.
Step 4: Turn the cleaner on its side and carefully withdraw the whole of the rear body from the bottom casing. This is a bit fiddly but it should just pull away.
Once you have withdrawn this you will see that you now have the motor and, alongside it, the cable mechanism revealed. In my case, the cable wheel had become slightly dislodged from its flange so that the cable had then wound itself around the outside of the wheel - which is why it was stuck. In order to overcome this I pressed the retractor button (now just a white lever since you have already removed the housing above it) and got someone to carefully pull the cable out. Very simple. Once the cable is fully retracted you can easily re-seat the wheel back in its flange.
One other thing to note: because I was doing this for the first time and didn't know where the screws were located, I also removed both filters before I began. You may find it easier if you do this too.
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