Quantum cxl. Why doesn't replacement lamp work?

Singer website has several books listed for this model,
http://www.singerco.com/uploads/download/231_xl5000_wkbk.pdf

User's Manuals, including yours, are available as a free download the Singer Sewing Machine website. Actually, when you enter CXL you get the XL-50 user's manual, which is essentially the same machine, although a few of the patterns may be different. The CXL, XL-50, XL-10 and XL-1 are basically the same machine; I own a CXL and XL-50, and love them. They can sew SIDEWAYS--straight AND zigzag stitch!

http://www.singerco.com/accessories/instruction-manuals

Drop the actual model number (like XL-150, XL-500 etc.) into the search box.

Search for:

Make Model manual

Are you using the embroidery foot? I don't have a Quantum, but on my machine you have to switch from a regular foot to the embroidery foot.

Your shuttle timing is out, this will need a qualified mechanic to fix it, it is to complicated to explain, as the needle timing may also be out.l

outlet, cord, switch, transformer, check in that order

Go to this site
http://www.singerco.com/support/us_warranty.html

search for a Service Center in your state, call them for how to send in the machine and how much it will cost for repair.
sewman7

Your needle is probably to long or you need to open it more

The needle shaft sticks to the curved arm and won't come down because a piece of plastic, about an eighth of an inch thick had broken from age. It prevented the shaft from staying up on the needle arm. Open the cover, try to stitch decorative stitch and see what I mean. Purchase a package of 4-10 by 1/2 nut and bolt pack. Screw the nut all the way onto the bolt. Using needle-nosed plyers, Carefully bend the curved arm slightly, and place bolt into the hole on the top of the needle shaft. Nut will keep it in place. Lowering the needle shaft using wheel, carefully bend arm back in place. Try decorative stitch. It should work. It does for me.