7.7 Methods for Dismounting and Mounting
WARNING Do not dismount or mount printed–circuit boards unless you
have received maintenance and safety training.
When opening the cabinet and replacing a printed–circuit board,
be careful not to touch the high–voltage circuits (marked
fitted with an insulating cover). Touching directly the high–volt-
age circuits gives you a shock hazard.
CAUTION When replacing a printed–circuit board, note the following:
CAUTION1 When dismounting the printed–circuit board, be careful not to
touch semiconductor devices on the board by hand or not to al-
low these devices to touch other parts.
CAUTION2 Check that the settings for the new printed–circuit board are cor-
CAUTION3 After replacement, make adjustments, if necessary, for the
printed–circuit board correctly.
CAUTION4 Cables removed during replacement must be connected as
they were connected previously. If there is a possibility that the
connection points of cables will be confusing, note down the
connection points before removing the cables.
CAUTION5 Before replacing the printed–circuit board, turn off the power to
the control unit.