User's Manual

78 MDS Master Station MDS 05-6399A01, Rev. D
7 TROUBLESHOOTING
If trouble occurs with the unit, verify that it meets the basic requirements listed below. These items should
be checked prior to starting any detailed troubleshooting or calling for assistance. All units must have:
• Adequate and stable primary power
• Secure cable and wiring connections
• Proper configuration for the application
Most radio system problems are due to the failure of components outside of the transceiver—such as a
poor or broken feed line or antenna connection. This section will help you determine whether the problem
is outside or inside the radio and, if in the radio, how to restore operation as quickly as possible.
GE MDS does not recommend component-level repairs in the field. However, you can replace the radio’s
major assemblies without using tools or test equipment. Section 7.4 Replacing Modules covers this in
detail.
NOTE: Before starting any detailed troubleshooting, check the basic requirements at both ends of the
link: primary power, secure cable connections, and proper antenna heading. In many cases, one of these
causes poor operation or a complete loss of link service.
7.1 Interpreting Module LEDs
The LEDs on the front of installed modules provide useful information when troubleshooting. Refer to
Section 6 Master Station Modules for detailed descriptions for module LEDs. Power and alarm indica-
tors are provided on Platform Manager (6.3.1), Radio (6.4.1), and Alarm/Relay modules (6.5.1). Radio
Modules also have TX/RX LEDs to show wireless activity.
7.1.1 Normal Operation
During normal, operation, there should not be any Red LEDs illuminated. All illuminated LEDs should
be BLUE or GREEN.