Instruction Manual

Repair

DN00283717 © Nokia Corporation 17 (26)

Issue 2 DRAFT 1 - en Nokia Proprietary and Confidential

WARNING

Note

3.4.2.2 To replace a faulty RU IP53

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 one M6 x 40 screw on top of the cover which secures the enclosure

cover to the wall.

5. Remove the cover by sliding it upwards along the bars on both sides of the

backplate.

6. Disconnect the power supply cable from the RU.

7. Disconnect the antenna cables from the RU.

8. Disconnect carefully the two fibre optic cables from the RU and fit

protective caps to the ends of the fibre optic cables.

9. Remove the five M3 x 8 fixing screws which secure the RU to the

backplate of the enclosure.

10. Lift the RU up and off the backplate, then store it in a safe place.

11. Obtain a known good RU and carefully place it on the mounting rack,

pushing it down gently to secure it in position.

12. Secure the RU to the mounting rack using five fixing screws.

13. Connect the antenna cables to the RU in their correct positions.

14. Remove the protective caps from the ends of the fibre optic cables and

carefully connect the two fibre optic cables to the RU. Store the protective

caps in a safe place.

15. Connect the power supply cable to the RU power supply connector.