[spooky]

It sound like you 5552 needs "TWEEKING", on this model there is only one adjustment possible and thats a small suface mount pot on the brown wafer thin ribbon the runs from the laser to the motherboard, just at the to of this ribbon you will see the pot in question, turn it clockwise or anti clockwise to "TWEEK" the laser

BE WARNED. make a mental note of the oiginal position so if it totaly fails you can turn it back (best if you can meter it out, if you have a multi meter available). Also dont use a screw driver to adjust it as you may tear it from the ribbon, light finger pressure should do the job!

Remember only a very small adjustment is nessecary.