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190-00067-25 Rev D 3-1
SECTION 3
TROUBLESHOOTING
The GPS 155XL contains static sensitive components. Observe proper anti-static
procedures when troubleshooting the unit.
3.1 INTRODUCTION
This section contains information to aid in troubleshooting the GPS 155XL to the assembly level.
3.2 TROUBLESHOOTING EQUIPMENT
Test Fixtures/Test Harnesses are User Supplied. Load and signal information
given in Figures 2-1 and 2-2 can aid in the fabrication of any Test Fixtures or
Panels.
The following equipment (or a suitable substitute) is necessary to perform troubleshooting:
1. Power Supply Capable of 10-33 Volts @ 6 Amps
2. Digital DVM—Fluke 8000A
3. BFGoodrich Precision Track Selector
4. GPS Antenna—Garmin GA56 (P/N 010-10040-01)
5. Male to Male BNC Cable 10 ±1dB attenuation (P/N 320-00088-00)
6. Red and Black Cables with Banana Plugs (3 ft. recommended)
7. 60 MHz Oscilloscope
3.3 SELF-TEST FAILURES
The GPS 155XL monitors many of its internal functions and displays a message to alert the user if a failure
occurs. Table 3-1 shows the recommended repair for each self-test failure message. When multiple repair
actions are listed, the most probable failure is listed first.