Nortel Passport 15000, Hardware Installation And Maintenance, Page: 763 / 874

Chapter 17 Hardware procedures 763
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
Procedure steps
1 Place a temporary anti-ESD pad or container near the NEBS 2000 frame
or equivalent so that the removed cooling unit can sit on it while waiting
for the packaging of the replacement unit. The pad needs to be a
minimum of about 65 cm by 65 cm (2 feet, 2 in. square). Disregarding
ESD protection can affect the results of diagnosing equipment failure.
2 Contact the software operator of the Passport 15000 or 20000 switch to
inform that cooling unit alarms will be generated while the unit is being
replaced.
3 Switch off both cooling unit breakers and put tape on them to indicate
neither was tripped. To ensure that you switch off the correct breakers,
refer to the table “Location of cooling unit breakers on the front of the BIP”
(page 702).
4 At the rear of the NEBS 2000 frame or equivalent, check the LEDs of the
cooling unit to ensure that none are lit. This confirms that power is off
since the fan blades can still be rotating freely while slowing down.
5 Facing the rear of the upper cooling unit at the rear of the frame and above
the fans of the lower (front) cooling unit, disconnect power cable A by
pressing and holding the tabs on the side of the connector and pulling
straight out. (The cables at the right side are for the lower cooling unit.)
6 Label the cable to identify which connector it plugs into (for example, with
UA for upper unit, power connector A).
7 Repeat the two previous steps for power cable B, using UB for the label.
8 Unfasten the 2 small slotted captive screws on the D-sub connector below
the A and B power connectors.
9 Leave the F1, F2, and F3 cables connected on the fan side of the cooling
unit.
10 Unfasten the 4 thread-forming 10-mm (3/8-in.) hex-head mounting screws
at both sides of the frame. Put the screws aside for re-use. Be ready for
the unit to slide out on its own and to support its weight of 9 kg (20 lbs).
11 By gripping the mounting ears at either side of the unit, slide it straight out
and away from the frame.
12 Put the cooling unit on the ESD protection pad or container.