User's Manual

MODEL 2130 MARKER BEACON
Rev. A April, 2005 6-1
This document contains proprietary information and such information may not be disclosed to others for any
purposes without written permission from SELEX Sistemi Integrati Inc.
6. CORRECTIVE MAINTENANCE
6.1 Introduction
This section contains instructions required for onsite corrective maintenance and offsite repair of the Marker Beacon
system. Required test equipment is defined and packing instructions are included in this section.
6.2 Test Equipment Required
Table 1-3 lists the test equipment and associated characteristics required to maintain the Marker Beacon system.
6.3 Onsite Corrective Maintenance
The following paragraph provides general troubleshooting information.
6.3.1 General Troubleshooting Information
a. Identify the symptom.
b. List the symptoms that you find or a field technician describes. If someone else describes the symptoms to you,
check the symptoms yourself or have that person demonstrate the symptoms to make sure the problem is not an
operator error.
c. Do a careful visual inspection of the suspected assembly, including the following suggestions.
1. Check for signs of excessive heat.
2. Check that all integrated circuits (ICs) are firmly seated in their sockets and that the ICs have no bent
pins.
3. Check that printed circuit board edge connectors are clean and seated fully.
4. Check the ribbon-cable connectors.
d. Check the power supplies. Power supplies are a very common source of problems. Low voltage or excessive ripple
may make it appear that an IC is bad.