September 5, 2008 6881076C25-E
4-20 Troubleshooting Procedures: Receiver Front-End (RXFE)
4.4 Receiver Front-End (RXFE)
This section provides band-specific troubleshooting procedures for the receiver front-end.
4.4.1 VHF Band
This information will help you troubleshoot the Spectra radio. Use this information, along with the
Theory of Operation, to diagnose and isolate the cause of failures. The principle tools needed to
troubleshoot a circuit to the component level are the schematic and the Theory of Operation.
In addition to the schematic and theory, this section includes a troubleshooting chart that will guide
you through a sequence of tests and checks designed to isolate problems.
Prior to troubleshooting, it is important to review the Theory of Operation including specific
precautions and troubleshooting methods.
4.4.2 UHF Band
This information will help you troubleshoot the Spectra radio. Use this information, along with the
Theory of Operation, to diagnose and isolate the cause of failures. The principle tools needed to
troubleshoot a circuit to the component level are the schematic and the Theory of Operation.
In addition to the schematic and theory, this section includes a troubleshooting chart that will guide
you through a sequence of tests and checks designed to isolate problems.
Prior to troubleshooting, it is important to review the Theory of Operation including specific
precautions and troubleshooting methods. Because much of the radio’s circuitry operates at
500 MHz, measurements must be taken carefully.
4.4.3 800 MHz Band
This information will help you troubleshoot the Spectra radio. Use this information, along with the
Theory of Operation, to diagnose and isolate the cause of failures. The principle tools needed to
troubleshoot a circuit to the component level are the schematic and the Theory of Operation.
In addition to the schematic and theory, this section includes a troubleshooting chart that will guide
you through a sequence of tests and checks designed to isolate problems.
Prior to troubleshooting, it is important to review the Theory of Operation including specific
precautions and troubleshooting methods. Because much of the radio’s circuitry operates at
800 MHz, measurements must be taken carefully.
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