20 Impedance Analyzer
1 Troubleshooting
To Troubleshoot the Instrument
This section describes the basic troubleshooting procedural flow
when servicing the E4990A. 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 E4990A. Figure 2 shows the trouble isolation
flow chart.
Step 1. Turn the instrument power on.
A few minutes after the E4990A is turned on, the measurement
view is displayed on the screen. The display screen should be
similar to Figure 10, “E4990A Application view,” on page 31.
Step 2. Check the display.
• If no display appears on the LCD after the E4990A is turned on,
go to “No Display Troubleshooting" on page 22.
• If the E4990A stops during booting process despite something
being displayed on the LCD, go to “Booting Process
Troubleshooting" on page 27.
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 34.
Step 4. Check the measurement function.
If the instrument fails performance test, go to “Performance Test
failure Troubleshooting" on page 39.
If the measurement function does not work correctly, perform the
diagnostic tests provided in the E4990A’s service function. If the
diagnostic tests fail, go to “Troubleshooting Using Diagnostic
Test" on page 32.
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