IBM BladeCenter HT 8740, Problem Determination And Service Manual

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Statement 31:
DANGER
Electrical current from power, telephone, and communication cables is
hazardous.
To avoid a shock hazard:
v Do not connect or disconnect any cables or perform installation,
maintenance, or reconfiguration of this product during an electrical
storm.
v
Connect all power cords to a properly wired and grounded power
source.
v
Connect to properly wired power sources any equipment that will be
attached to this product.
v When possible, use one hand only to connect or disconnect signal
cables.
v
Never turn on any equipment when there is evidence of fire, water, or
structural damage.
v Disconnect the attached ac power cords, dc power sources, network
connections, telecommunications systems, and serial cables before you
open the device covers, unless instructed otherwise in the installation
and configuration procedures.
v
Connect and disconnect cables as described in the following table when
installing, moving, or opening covers on this product or attached
devices.
To Connect: To Disconnect:
1. Turn OFF all power sources and
equipment to be attached to this product.
2. Attach all cables to the devices.
3. Attach signal cables to the connectors.
4. Attach power cords to power sources.
For dc systems, ensure correct polarity of
-48VDC connections: RTN is (+) and
-48VDC is (-). Earth ground should use a
two-hole lug for safety.
5. Turn ON all the power sources.
1. Turn OFF all power sources and
equipment to be attached to this product.
v For ac systems, remove all power
cords from the chassis power
receptables or interrupt power at the
ac power distribution unit.
v
For dc systems, disconnect dc power
sources at the breaker panel or by
turning off the power source, then
remove the dc cables.
2. Remove the signal cables from the
connectors.
3. Remove all cables from the devices.
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BladeCenter HT Type 8740 and 8750: Problem Determination and Service Guide