Users Manual

124 MDS™ Master Station MDS 05-6399A01, Rev. G
switch can remain in the automatic position, and the active radio can be selected via the web UI,
or CLI.
8.3 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 [phone], or visit our website at
www.gemds.com for additional contact options.
8.4 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.
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 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, or approxi-
mately 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
Module
ID
Module Module Description
6755 100-220 AC Power Supply Module 100-220 VAC, 50/60 Hz. 120W Max AC Power Supply Module.
6843 +/- 12-36 VDC Power Supply Module +/- 12-36 VDC. 10 A Max. DC Power Supply Module.