Garmin 155XL Maintenance Manual - Section 5

190-00067-25 Rev D

        5-1

SECTION 5

TESTING

5.1

INTRODUCTION

The test procedures in this section are provided to aid the technician in locating faulty assemblies within the unit.

The test procedures can be performed before troubleshooting is started or they can be used as a “return to

service” test after replacements of assemblies have been made.  All tests can be performed without accessing the

inside of the unit.

The GPS 155XL contains static sensitive components.  Observe proper anti-

static procedures when testing the unit.

5.2

TEST 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 standard equipment (or suitable substitutes) is needed to perform testing.

1.

Power Supply Capable of 10-33 V @ 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 

±

1 dB attenuation (P/N 320-00088-00)

6.

Red and Black Cables with Banana Plugs (3 ft. recommended)

7.

60 MHz Oscilloscope