Local & Network-Wide Problem Solving; Local Problem-Solving; Problem-Solving With Led Indicators - GE MDS 4790M Installation And Operation Manual

MDS 05-3628A01, Rev. B
7.0 LOCAL & NETWORK-WIDE
PROBLEM SOLVING
The majority of radio operation problems are due to the failure of components
outside of the radio, out in the elements—usually a poor or broken feedline 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,
the radio's major assemblies may be replaced without using tools or test
equipment. Section 7.3, Replacing Assemblies, beginning on page 67 covers
this in detail.
If you are unable to solve a system problem with the information provided
here, technical assistance is also available from GE MDS. Refer to the inside
back cover of this guide for contact information.
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 things may be at fault and cause poor operation or a complete
loss of link service.

7.1 Local Problem-Solving

Problem-Solving with LED Indicators

The first indication of a problem is usually an illuminated
front panel. In normal operation, only the green (
(and, in a master station configured for redundant operation, one of the yellow
STBY LEDs).
In a redundant master station, the LEDs show the state of the A and B
transceiver boards. In a non-redundant master station, the LEDs show the state
of the A transceiver board.
Refer to Figure 26 and Table 15 on page 64 for an explanation of the LED
indicators.
MDS 4790M (MPT 1411) I/O Guide
Invisible place holder
Figure 26. LED Indicators
LED on the
ALARM
) LED should be lit
ACTIVE
63