Brother International HL-4000CN Service Manual - Page 14

High-temperature Units When servicing high-temperature units (securing unit, etc.), be sure to turn them OFF to prevent burns, injuries and other troubles, remove the power plug and start service processes after they have cooled down enough. WARNING immediately after completion of operation, they are still hot. Start services after more than 40 minutes. Laser Beams WARNING • if your eyes are exposed to laser beams, you may lose your eyesight. • Never open the cover if warning label for laser beams is attached there. • Before disassembling and reassembling this laser printer, be sure to turn it OFF. • When servicing this laser printer while it is running, be sure to follow the procedures specified in this manual. • You should understand the features of the laser beams which are capable of having an injurious action on the human body, not to extend the danger over the workers as well as other people around the printer. Note: I Laser beams have features as follows: • Frequencies are smaller in width than other beams (sun and electric bulbs) and phases are uniform so that high monochromatic and convergence performance can be obtained and thin beams oflight can reach places at a long distance. • Due to the high convergence, beams are concentrated in high density and high temperature, which is dangerous to human body. Reference: Laser beams of this laser printer is invisible rays which you cannot see. Print Head Cartridge ASSY Scanner ASSY