HP AdvanceStack J2610B Installation And Reference Manual page 52

Safety Information
Safety Symbols
WARNING
CAUTION
Servicing
There are no user-serviceable parts inside these products. Any servicing, adjustment,
maintenance, or repair must be performed only by service-trained personnel.
These products do not have a power switch; they are powered on when the power cord is
plugged in.
2 Safety Information
Documentation reference symbol. If the product is marked with this symbol,
refer to the product documentation to get more information about the product.
A WARNING in the manual denotes a hazard that can cause injury or death.
A CAUTION in the manual denotes a hazard that can damage equipment.
Do not proceed beyond a WARNING or CAUTION notice until you have
understood the hazardous conditions and have taken appropriate steps.