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APEX™ Exciter Incorporating FLO™ Technology

Table of Contents

2604s100TOC.fm

03/08/07 888-2604-001 Page: xiii

WARNING: Disconnect primary power prior to servicing.

5.3 Default Settings For DIagnostics Screens. . . . . . . . . . . . . . . .5-10

5.4 Typical Settings for the More Critical Exciter Setups . . . . . . . . . . .5-11

5.5 Exciter Troubleshooting Flow Charts . . . . . . . . . . . . . . . . .5-12

5.6 General Troubleshooting . . . . . . . . . . . . . . . . . . . . . .5-16

5.6.1 Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16

5.7 System Troubleshooting . . . . . . . . . . . . . . . . . . . . . .5-17

5.7.1 PA, HPF, or ADC Adaptive Processing Faults . . . . . . . . . . . . . 5-17

5.7.2 Transmitter Response Not Conforming to Mask Requirements . . . . 5-17

5.7.3 Checking Transmitter Spectrum . . . . . . . . . . . . . . . . . . . . 5-18

5.7.4 ASI Transport Stream Faults . . . . . . . . . . . . . . . . . . . . . . 5-18

5.8 Exciter Troubleshooting . . . . . . . . . . . . . . . . . . . . . .5-19

5.8.1 Frequency Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19

5.8.2 Dark Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19

5.8.3 Power Supply Voltages . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

5.8.4 Troubleshooting Down to the Board Level . . . . . . . . . . . . . . . 5-21

5.8.4.1 Digital Tray Transmission Data Path . . . . . . . . . . . . 5-21

5.8.4.2 Analog Tray Signal Path . . . . . . . . . . . . . . . . . . 5-21

5.8.5 Isolating Problem to the Analog or Digital Tray . . . . . . . . . . . . 5-21

5.8.5.1 Checking Operation of the Entire Digital Tray . . . . . . . 5-21

5.8.5.2 Checking Operation of the Entire Exciter. . . . . . . . . . 5-22

5.8.6 Isolating a Faulty Board in the Digital Tray . . . . . . . . . . . . . . 5-23

5.8.6.1 Modulator Board . . . . . . . . . . . . . . . . . . . . . . 5-23

5.8.6.2 Adaptive Precorrector Board . . . . . . . . . . . . . . . . 5-24

5.8.6.3 ADC and DAC Boards . . . . . . . . . . . . . . . . . . . 5-24

5.8.6.4 Front Panel Board . . . . . . . . . . . . . . . . . . . . . . 5-24

5.8.6.5 Controller Board . . . . . . . . . . . . . . . . . . . . . . 5-24

5.8.7 Analog Tray Troubleshooting. . . . . . . . . . . . . . . . . . . . . . 5-25

6 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Appendix AExciter GUI Screen Captures. . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Harris APEX User Manual

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