Instruction Manual

Maintenance
14 (26) © Nokia Corporation DN00283717
Nokia Proprietary and Confidential Issue 2 DRAFT 1 - en
WARNING
Caution
3.3 MU
3.3.1 Locating a faulty unit
To locate a faulty unit in the MU
1. Connect the laptop PC as described Section 3.1.1.
2. Start the Supervisor software application.
3. The LED icon of the faulty unit in the Supervisor software window will be
coloured red.
3.3.2 Replacing a faulty unit
Relevant warnings and cautions are given in Nokia InLite: Warnings and
Cautions.
Advise all persons who perform operations on this equipment of the potential
dangers.
To replace a unit in the MU
If the faulty unit is a Local Unit, the fibre optic cables must be disconnected
before the unit is removed.
1. Undo the four captive retaining screws securing the unit to the MU rack.
2. Carefully withdraw the unit from its position in the MU rack, then store the
unit in a safe place.
3. Insert a known good unit into the location vacated by the faulty unit,
making sure that the unit is correctly aligned on its guides and is pushed
firmly back to engage with the mating connector at the rear of the location.
4. Secure the unit in position using the four captive retaining screws.
5. Check that the replacement unit is operating correctly, using the Supervisor
software. The LED icon should be coloured green.
6. Close the Supervisor software and shut down the laptop PC as described in
Section 3.1.2.
7. Refit the MU cover.