90 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Self Test
Troubleshooting Self Test 102
Troubleshooting Self Test 102
A self test 102 failure can be caused by a number of possible causes; A1 Power
Supply, A2 Vector, or the A3 RF assembly. Self test 102 is the JTAG Chain
check (Joint Test Action Group). The testing makes use of a protocol to access
a set of test registers that preset chip logic levels and device capabilities of
various parts. The protocol verifies setting in the many different FPGA, PROMs,
and individual IC’s to determine the validity of each component. Instrument
"Error" messages and/or other reported self test failures, listed under "View
Details", should be considered prior to replacing any specific hardware.
Validate all power supply voltages first by referring to Chapter 8, “Power
Supply”. Evaluating the specific self test failures and the power supply values
may identify the probable faulty assembly.
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