HP J3420B -HSC ATM/155 Installation Manual page 20

Installing the HP-HSC ATM/155 Adapter
system.
WARNING Electric shock hazard. Shut down and turn off the system, and
disconnect the power cable and all telecommunications network
cables before opening the system or accessing the slots.
You must turn off the power to the system before you install the adapter.
CAUTION
Otherwise, the equipment—the system and/or the adapter—might be
damaged.
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