Tekelec T1000 Hardware Manual page 111

1.
Turn OFF the circuit breakers that supply power to the T1000 AS chassis to be
removed.
To locate the circuit breakers supplying power to the T1000 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 T1000 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 T1000 AS chassis
are turned OFF by measuring the voltage with a VOM on the cable that
connects the T1000 AS chassis to its breakers. Both A and B power LEDs on
the front panel of the T1000 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.
Do one of the following, depending upon the type of cable management
system you have:
• For Rear Cable Management Arm Systems, disconnect the cable
management arm at the chassis end by removing the knurled captive
fasteners attaching the arm to the chassis. See Figure 7-2 and Figure 7-3 for
locations of the screw holes.
• For Side Cable Management Arm Systems you do not have to remove the
cable management arms from the frame. Proceed to the next step.
910-0095-001 Revision J November 2007
How to Access T1000 AS FRUs
7-11