Thermo Scientific Micro-Tech 9101 Reference Manual page 23

Introduction
Important Safety Information
WARNING. All switches (such as control or power) must be OFF
when checking input AC electrical connections, removing or inserting
printed circuit boards, or attaching voltmeters to the system. 
WARNING. Incoming voltages must be checked with a voltmeter
before being connected to the electronics. 
WARNING. Extreme caution must be used in testing in, on, or around
the electronics, PC boards, or modules. There are voltages in excess of
115V or 230V in these areas. Avoid high voltage and static electricity
around the printed circuit boards. 
WARNING. Maintenance procedures should be performed only by
qualified service personnel and in accordance with
procedures/instructions given in this manual. 
WARNING. During maintenance, a safety tag (not supplied by Thermo
Fisher Scientific) should be displayed in the ON/OFF switch areas as a
precaution instructing others not to operate the unit. 
WARNING. Only qualified service technicians should be allowed to
open and work in the electronics, power supply, control, or switch
boxes. 
WARNING. This equipment should not be operated or utilized in
applications other than those stated in the original order. 
Thermo Fisher Scientific Micro-Tech 9101/9201 Reference Manual, Rev J 1-5