126 Chapter 6
Troubleshooting the IF Section
What You Will Find in This Chapter
What You Will Find in This Chapter
The following information is presented in this chapter:
1. Theory of operation of the 3rd converter section and the IF section.
2. Isolating the cause of an hardware problem by verifying the
functionality of assemblies in the IF section signal path.
NOTE Each of the following sections first describes how the assembly works,
then gives information to help you troubleshoot the assembly. Each
description explains the purpose of the assembly, describes the main
components, and lists external connections to the assembly.
This following sections are found in this chapter:
• Third Converter Assembly Description ...............................page 127
• Verifying the Third Converter Board...................................page 129
• Analog IF Assembly Description..........................................page 133
• Verifying the Analog IF Assembly Signal Path...................page 136
• Digital IF Assembly Description ..........................................page 139
• Verifying the Digital IF Assembly........................................page 141
NOTE Information regarding the Option 122 or 140 Wideband IF assemblies
can be found under the Hardware Options tab of this service guide.
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