Agilent Technologies 8590 Series Service Manual page 421

DVB-C 8594Q QAM Analyzer Option 190
The following section contains information to assist in troubleshooting
the DVB-C mode of operation of the 8594Q Option 190 DVB-C QAM
analyzer.
The 8594Q Option 190 DVB-C QAM analyzer is a complex instrument
CAUTION
to troubleshoot. It is recommended that the following troubleshooting
procedures be performed by an approved Agilent Technologies service
center only.
This information is divided into two sections.
• Troubleshooting Tree
• Option 190 Service Menus
Troubleshooting Tree
The following troubleshooting trees are provided as a tool to use to
isolate the most common problems in an 8594Q QAM analyzer.
More complex interactive problems will require more detailed
troubleshooting knowledge to be gained with experience and help from
division engineers.
Use the following guidelines to use the 8594Q Option 190 DVB-C QAM
analyzer troubleshooting trees use the following guidelines.
1. Start with TREE 1.
2. Read and evaluate each key question in the tree you are working
3. Follow through the flow of the trees, sequentially, starting with
There are five troubleshooting trees included in this section.
• Tree 1: Spectrum Analyzer Platform vs Option 190
• Tree 2: Internal Preamplifier
• Tree 3: Option 190
• Tree 4: EVM Problems
• Tree 5: Average Power Test Problems
Chapter 10
First LO Distribution Amplifier (LODA) 8593E, 8594E, 8594Q, 8595E, 8596E Option 009
with before moving on to the next tree.
TREE 1, for every new problem.
Analyzer Options and Block Diagrams
421