Harris APEX - Page 15

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