Instruction Manual

Maintenance
18 (26) © Nokia Corporation DN00283717
Nokia Proprietary and Confidential Issue 2 DRAFT 1 - en
WARNING
WARNING
Note
16. Where applicable, set the RU power to ON at the mains switchboard or at
the CPSU.
17. At the location of the replacement RU, verify that its power LED is lit
(GREEN) and the red FAULT LED is unlit (dark) on the RU.
18. Use the ISMMan software to check that the alarm has disappeared.
19. Replace the cover by sliding it downwards from top of the backplate along
the bars on both sides of it.
20. Secure the cover to the wall using one fixing screw.
21. Send the faulty RU, suitably identified and fault symptom(s) stated, to
Nokia for repair, using the procedure advised by the local Nokia agent.
3.4.2.3 To replace a faulty RU IP64
Disconnect the power connector from the RU before performing this
procedure.
Shut down the laser in the LU connected to the RU that is to be replaced.
Respect the laser radiation warnings.
Refer to document Installation
1. Connect the laptop PC to the MU as described in Figure .
2. Start the ISMMan software application.
3. Go to the Local Unit window of the ISMMan software. Use the ISMMan
software to switch off the DL laser of the relevant LU. The colour of the
LED icon will change to red.
4. Remove the 10 M5 x 16 screws on top of the cover which secure the cover
to the enclosure, and open the cover.
5. Disconnect the power supply cable from the RU.
6. Disconnect the antenna cables from the RU.
7. Disconnect carefully the two fibre optic cables from the RU and fit
protective caps to the ends of the fibre optic cables.
8. Remove the wing screw from the splice box and open the splice box.
9. Very carefully remove the fibre optic cables from the splice holder in order
not to break the fibre optic cables.