Appendix A - Replacement of Modules and Parts
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fault. Store the faulty modules properly in the carton. Label the
carton for easy identification and handling in the future.
v.
Insert the new lightning protection module into the cabinet front
panel.
4.
Confirmation after replacement
After the module is inserted and powered on, it can be seen that green
indicator in the module plug-in box is on from the back of the module;
meanwhile, the fan is normally started on the front panel, which
indicates the PSM main module is already working normally; otherwise
it is necessary to find out the PSM failure cause and switch on again all
the breaker switches of relevant modules on the PSM front panel. If
the power indicators of all the modules are on in green, it means PSM
module power output is completely normal; otherwise it is necessary to
find out the PSM failure cause.
Backplane Replacement
The MTRM backplane is replaced at the back of the rack. Since the
backplane replacement may influence the communication in a cell, so the
approval from the office and relevant technical personnel before the
replacement is necessary.
1.
Tools
Anti-static wrist strap
Cross screwdriver
2.
Preparation:
i.
Perform the fault observation and analysis and determine the
replacement is necessary.
ii.
Prepare a good spare part with the same type as that of the faulty
module.
iii.
Prepare an anti-static bag, damp-proof bag and carton, as well as
some labels for identification.
iv.
Record the slots of all the modules on the backplane to be replaced
and cable locations (such as RF cables and feeder jumpers) on the
front panel of these modules. After the replacement, these modules
and cables should be inserted back.
3.
Procedure
i.
The backplane are replaced at the front side of the rack.
ii.
Put on the anti-static wrist strap properly and turn off the relevant
power.
iii.
Unplug cables on all the module front panels on this layer and all
the modules on this layer.
iv.
Loosen the screws fixing the backplane by using a cross
screwdriver to put down the backplane. There are many cables
inserted in the inner side of the backplane. Record cable locations
