Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 730 / 874

730 Chapter 17 Hardware procedures
241-1501-240 5.2S2
Removing a temperature sensor bracket assembly
Remove a temperature sensor bracket assembly for an upper cooling unit to
replace it or to remove the upper shelf assembly.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• You need a step ladder to see down onto the top of the upper shelf
assembly and a driver for the thread-forming 10-mm (3/8-in.) hex-head
screws that fasten the bracket to the frame or rack.
• See the figures:
— “Location of the temperature sensor bracket assembly” (page 731)
— “A temperature sensor bracket assembly” (page 732)
• Minimize the impact or risk of having an out-of-service temperature
sensor by “Installing a temperature sensor for an upper cooling unit”
(page 542) immediately.
Procedure steps
1 Standing on a step ladder at the rear top of the upper shelf assembly,
identify which upper temperature sensor is to be replaced as shown in the
figure “Location of the temperature sensor bracket assembly” (page 731).
2 Disconnect the D-sub connector of the wire cluster at the right end of the
bracket as shown in the figure “A temperature sensor bracket assembly”
(page 732). Apply gentle, even, steady, and straight force using a hand on
each half of the connector.
When the temperature sensors on the bracket assembly are
disconnected, the fans immediately speed up to their higher rpm.
3 Unfasten the 2 mounting screws, one at each end of the bracket. Put the
screws aside for re-use. If you drop a screw, you must retrieve it to prevent
equipment damage.
4 Pull the bracket assembly straight away from the shelf assembly.