User’s Manual for Node C Network Elements
Page 88
PRELIMINARY M0121A1A_uc.doc
SMA connectors have a specified torque of 100 Ncm. Use an appropriate tool to
fasten and unfasten these. Do no over tighten the connectors or screws. The table
below shows various screws with their respective torques.
Screw Type
Tallow-drop
Socket head cap
Countersunk head
Thread size
Specified Torque (in Ncm)
M 2.0
40
not in use
40
M 2.5
82
not in use
82
M 3.0
145
100
145
M 4.0
330
330
330
M 5.0
650
tbd.
650
table 6-1 Specified torques for various screw types
)
Note:
Depending on the configuration of the Node C the FRU can be
equipped with a 50-Ohm termination resistor. In such a case, use
the termination resistor of the old FRU to terminate the respective
connector of the replacement part.
)
Note:
After the replacement of a component, check whether the system
has to be levelled anew.
)
Note:
Do not forget to reinstall the front cover after the replacement
procedure to ensure safe operation.
If any FRU not contained in the following chapter needs to be replaced, contact
customer service for additional instructions.
6.2.1 Power
Supply
•
To remove a power supply,
first disconnect all cables.
•
Unscrew the seven M4
socket head cap screws by
which each power supply
is fastened to the cabinet.
•
Use these screws to fasten
the new power supply and
reconnect all cables.
figure 6-1 Power supply screws
