260 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Baseband Generators
A2 Vector BBG Assembly Troubleshooting
Figure 12-10 BNC Outputs Marker 1
13.If any of the outputs do not look like that shown, replace the A2 Vector
BBG assembly.
Self Tests
There are a series of Self Tests related directly to the A2 Vector BBG assembly.
They are the 700, 800, and 900 series tests. See Chapter 4, “Self Test,” for a
description of each of the tests.
When one of the self tests for this assembly fails the most likely cause of the
failure will be the A2 Vector BBG assembly. However, there could be other
assemblies that affect these test results. For example, if the supply voltages to
the assembly are lower than required the 701 BB Board Voltages Test could
fail, along with other tests. Or, if the RF signal level to the assembly is lower
than required the 901 Prelevel DAC Test could fail, along with subsequent RF
tests. So, a little analysis of the Self Test results may be required before
replacing the A2 Vector BBG assembly when a related self test fails.
Before replacing an A2 Vector BBG assembly for a Self Test failure be sure to
run the “I/Q Related Adjustments” listed later in this section. Also, be sure to
verify the power supply voltages by seeing the “Power Supply Status
Quick-Check” section in Chapter 8, “Power Supply”
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