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Field Replaceable Units
WARNING:
frame when working on electronic components.
1.
Turn OFF the power switch on the front to the Chassis. Next, turn OFF the
circuit breakers that supply power to the T1100 AS chassis to be removed.
To locate the circuit breakers supplying power to the T1100 AS chassis, refer to
the system interconnect diagram for the system type and/or read the labels on
the breakers. To access the circuit breakers on some frames, it may be
necessary to remove the plastic covers on the front of the breakers. If the
covers are removed, to maintain NEBS compliance, make sure they are
replaced when the FRU replacement has been completed.
WARNING: A T1100 AS chassis is redundantly powered from both A and
B -48 VDC buses. Ensure that both the circuit breaker supplying A power to
a chassis and the circuit breaker supplying B power to a T1100 AS chassis
are turned OFF by measuring the voltage with a VOM on the cable that
connects the T1100 AS chassis to its breakers. Both A and B power LEDs on
the front fascia of the T1100 AS chassis should be OFF.
2.
Remove the front door and any plastic panels from the rear of the frame.
3.
From the rear of the frame, check all cables attached to the chassis for correct
labeling. If any labels are missing or damaged, create a label that indicates
what connection it is attached to and where the other end is connected.
4.
Disconnect all cables from the rear of the chassis.
5.
From the front of the frame, remove the # 12-24 Phillips screw from each of the
chassis retention brackets (see Figure 7-2). Do not remove the screws in the
frame adapter brackets.
910-2969-001 Revision H, February 2007
DRAFT
Always wear an ESD wrist strap grounded to the bench or
7-13
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