MDS 05-6399A01, Rev. F MDS™ Master Station 117
One approach to field-level servicing is to have spare modules available. Slide in modules are
easily field replaceable, including Power Supply, Radio, Platform Manger, and Alarm/Relay
Modules. Internal Duplexers can also be replaced in the field. In this way, you can quickly
remove and replace a defective assembly with a working assembly. The following instructions
describe the removal and installation of these assemblies.
When installing Power Supply or Radio Modules, torque thumbscrews to
10 in-lbs, or approximately ¼ turn past hand tight, to insure optimum heat
transfer through thermal contact connector on the rear of the unit.
Power Supply Modules
The two left-most card-slots on the MDS™ Master Station are dedicated to Power Supply
Modules. To remove either of these assemblies, first disconnect the power supply cable. Loosen
the two thumbscrews on the front of the module, then slide the module straight out.
A Power Supply Module can be installed in either of the left-most slots on the Master Station. It
will not engage if an attempt is made to install into any other slot in the chassis. To install, align
the Module with the card guides and slide into the chassis until it engages with the backplane
connectors. Push firmly on the faceplate of the module to ensure a good connection and hand-
tighten the thumb screws. The thumb screws should be further tightened to 10 in-lbs, or
approximately ¼ turn past hand tight, to ensure optimum heat transfer through thermal contact
connector on the rear of the unit.
Connect the power cable first making certain that the supply is within the rating for the power
supply module you have installed.
Table 8-3. Power Supply Modules
DC power supply modules are available for several different input ranges.
These modules have interchangeable connectors. Make sure the supply is
within the rating for the module installed.
On a redundant unit equipped with two power supplies, a supply can be removed, and a new
supply can be installed, while the unit is powered and operational. Do not remove power supplies
whose power source is still connected and active.
Peripheral Modules – including Platform Manager, Radio, Alarm, and Alarm Relay
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