I have a pink Atlas but no manual. It is basically a Brother machine so you can follow a manual for a vintage Brother, if you have one.
ETA: I looked in my bookmarks and found a few helpful links:
http://possumjimandelizabeth.com/xht...as-thread.html
http://www.sewingmachinemanual.net/S...ion_Manual.htm
http://stitchnerd.files.wordpress.co...-threading.jpg
If you want to join the yahoo vintage japanese sewing machine group they have a Brother manual in their files that will work for the Atlas. Here is the link to the group:
http://groups.yahoo.com/group/vintag...ewingmachines/