14 Impedance Analyzer
1 Troubleshooting
To Troubleshoot the Instrument
This section describes the basic troubleshooting procedural flow
when servicing the Keysight E4991B. The primary procedural tool
in this section is the flowchart. The flowchart contains the entire
troubleshooting path from the failure symptom to the isolation of
faulty assembly, and will direct you through the repair in an
orderly manner through the possible failure symptoms. Reference
letters (Yes/No) on the flowchart point to procedural steps that
briefly explain the next troubleshooting method to be performed.
Primary Trouble Isolation
The primary trouble isolation procedure can be performed without
disassembling the Keysight E4991B. Figure 2 shows the trouble
isolation flow chart.
Step 1. Turn the instrument power on.
A few minutes after the E4991B is turned on, the measurement
view is displayed on the screen. The display screen should be
similar to Figure 10, “E4991B application,” on page 25.
Step 2. Check the display.
• If no display appears on the LCD after the Keysight E4991B is
turned on, go to “No Display Troubleshooting” on page 16.
• If the Keysight E4991B stops during booting process despite
something being displayed on the LCD, go to “Booting Process
Troubleshooting” on page 21.
Step 3. Check the basic function.
If the front-panel/keyboard/mouse controls, LCD display, data
storage, remote interface or other function (except the
measurement function) does not work correctly, go to “Function
Specific Troubleshooting” on page 28.
Step 4. Check the measurement function.
If the instrument fails performance test, go to “Performance Test
failure Troubleshooting” on page 33.
If the measurement function does not work correctly, perform the
diagnostic tests provided in the Keysight E4991B’s service
function. If the diagnostic tests fail, go to “Troubleshooting Using
Diagnostic Test” on page 26.
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