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Andrew Wireless Innovations Group RPT-MMR8L User Manual

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7 Maintenance 
 
ID No: 163511 
 
 
Page 33
 
7. MAINTENANCE 
7.1. MAINTENANCE 
)
 Note: 
The remote unit does not require preventative maintenance 
measures. 
Maintenance of the MMR8L L should be performed on a FRU (Field Replaceable 
Unit) basis only. Do not damage the warranty labels on the components, as this voids 
the warranty. 
 
The spare parts list contains only units that can be replaced without tuning or 
soldering work. 
) 
Note: 
Defect parts should only be replaced by original parts from the 
supplier. All interventions inside the housing are at one’s own risk.
 
) 
Note: 
During maintenance ensure that the unit has been disconnected 
from mains. 
To open the cabinet of the MMR8L L, observe the instructions in chapter 4.1.1 
General. 
) 
Note: 
Before disconnecting any cables, label any unlabeled cables to 
ensure correct reconnection. 
 
To replace an FRU, use the appropriate tools. Replacement tools may be ordered 
from the supplier. All screws have a right-hand thread, turn the tool clockwise for 
tightening and anti-clockwise for loosening.  
 
SMA connectors have a specified torque of 100 Ncm. Use an appropriate tool to 
fasten and unfasten these connectors. Do not 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 7-1 Specified torques for various screw types 
)
 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.