Redundant Units; Technical Assistance; Replacing Modules; Power Supply Modules - GE MDS Master Station Technical Manual

7.2 Redundant Units

The active radio can be identified by the corresponding LED on the alarm/relay module as well
as the active LED on the radio module. The active unit is normally selected automatically. For
troubleshooting, the toggle switch can be used to manually set the active radio. Alternatively, the
switch can remain in the automatic position, and the active radio can be selected via the SD
Manager UI.

7.3 Technical Assistance

Factory technical assistance is available by contacting GE MDS during business hours (8:30 AM
to 6:00 PM Eastern Time). For telephone assistance, call (585) 241-5510, or visit our website at
www.gemds.com for additional contact options.

7.4 Replacing Modules

Component-level repair of a transceiver board in the field is not recommended due to the com-
plex nature of the circuitry and the use of surface-mount technology throughout the radio. You
should return malfunctioning assemblies to the factory (or authorized service center) for repair or
replacement.
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 re-
move and replace a defective assembly with a working assembly. The following instructions de-
scribe the removal and installation of these assemblies.
10 in-lbs 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 Mod-
ules. 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 to en-
sure 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.
Module
Module
ID
MDS 05-6399A01, Rev. E
When installing Power Supply or Radio Modules, torque thumbscrews to
Table 7-3. Power Supply Modules
MDS™ Master Station
Module Description
93