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placing the appropriate labels on the dc power supply and fan unit CRU
to mark the LEDs correctly. The label sheet contains the peel-off labels
that you actually place on the dc power supply and fan unit CRU.
5. Using the information provided on the instruction sheet, place the labels on the
dc power supply and fan unit CRU to correctly mark the LEDs.
6. Turn off the power switch on the new unit.
7. Check the Fault LED to locate the failed dc power supply and fan unit. If a
fault is detected, the amber Fault LED is on.
8. Verify that the Service Action Allowed LED is on. Do not remove the dc power
supply and fan unit if the LED is off. For more information on the Service
Action Allowed LED, see “Service Action Allowed Status LED” on page 145.
Statement 1:
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 electrical
outlet.
v Connect to properly wired outlets 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 power cords, telecommunications systems,
networks, and modems 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 everything OFF.
2. First, attach all cables to devices.
3. Attach signal cables to connectors.
4. Attach power cords to power source.
5. Turn device ON.
1. Turn everything OFF.
2. First, remove power cords from power
source.
3. Remove signal cables from connectors.
4. Remove all cables from devices.
172 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide