DEC 4000 AXP Service Manual page 119

The following warning symbols appear on the system enclosure. Please
review their definitions.
Hazardous voltages are present within the front end unit
(AC power supply). Do not access unless properly trained.
Before you access this unit, remove AC power by pressing
the AC circuit breaker to the Off (0) position, and unplug
the power cord. Wait several minutes to ensure that
stored charge is no longer present. Do not plug in the AC
power cord unless the front end unit enclosure, including
all covers and guards, is fully assembled.
Unless you remove AC power by pressing the AC circuit
breaker to the Off (0) position, 48 V may be live in certain
areas within this unit. If 48 V is present, high currents
exist. If you are working in a high-current area and are
using conductive tools or wearing conductive jewelry, you
can incur severe burns.
Before you replace any Futurebus+ module, remove power
by pressing the AC circuit breaker to the Off (0) position.
High currents exist on the card cage modules and can
cause severe burns if you do not remove power. Failure
to remove power can cause damage to the Futurebus+
modules, as well.
The BA640 enclosure does not support warm swap of
Futurebus+ modules. You can use Futurebus+ modules
that have a warm swap feature within the BA640
enclosure, but their warm swap feature will be inoperative.
Do not access while fans are moving. Press the AC circuit
breaker to the Off (0) position to remove power and ensure
that fans cannot become energized unexpectedly.
Warning
Repairing the System 5–3