I had to play with threading my MC 6500P too.
The manual is never far away from grasp but it has not given me any problems so far !! I love it :)

I have just bought a Janome 1600p qc on a little Gracie frame.I cannot get it to sew anything right, stitches awful I am so discourged witht this machine, I know it is something I am doing wrong. The needle thread seems really tight and i can't seem to get it looser. The little window on the machine is set on 3 and stitch length on 2. I NEED HELP!!!!