IBM eServer 370 xSeries, User Reference Manual

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CAUTION:
When laser products (such as CD-ROMs, DVD drives, fiber optic
devices, or transmitters) are installed, note the following:
– Do not remove the covers. Removing the covers of the laser
product could result in exposure to hazardous laser radiation.
There are no serviceable parts inside the device.
– Use of controls or adjustments or performance of procedures other
than those specified herein might result in hazardous radiation
exposure.
DANGER
Some laser products contain an embedded Class 3A or Class
3B laser diode. Note the following.
Laser radiation when open. Do not stare into the beam, do not
view directly with optical instruments, and avoid direct
exposure to the beam.
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xSeries 370 User's Reference