My Printer says it is warming up and it wont

I have found that in alot of cases that these units stall on scanner bulb warming because the scanner cannot find home. do you hear a noise like the carriage motor contnues to just move a little bit? what happens is this the ccd knows its home by the brightness of the refected light off of the white carriage home strip on the back side of the glass cover its reflected to a photo cell which is tripped telling the ccd its home. if the bulbs the white strip or the mirrors inside the ccd get a light dusting of dirt on them they dimm this light and the photo cell will not be triped thus creatiing this problem. with a flash light you can see if these mirrrors are fogged. clean them with a q-tip and alcohol. about 65% this fixes it.