Chapter 10 427
Analyzer Options and Block Diagrams
First LO Distribution Amplifier (LODA) 8593E, 8594E, 8594Q, 8595E, 8596E Option 009
TREE 4: EVM Problems
IS THE FAILURE IN A SINGLE CHANNEL BANDWIDTH?
Comments Problems/Reasons Diagnostic/Fix Action
If the problem is concentrated in a
single-channel bandwidth setting,
the problem is probably in the RF
option board.
Replace the suspected RF board
assembly with a “known” good RF
board. If the analyzer passes the
EVM test, save the bad board and
the matching test data for division
analysis.
IS THE FAILURE IN A SINGLE SYMBOL RATE?
Comments Problems/Reasons Diagnostic/Fix Action
If the problem is concentrated in a
single-channel bandwidth setting,
the problem is likely in the
DEMOD board assembly.
Replace the suspect DEMOD board
assembly with a “known” good
DEMOD board. If the analyzer
passes the EVM test, save the bad
board and the matching test data
for division analysis.
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