36 Keysight E4980A/E4980AL Precision LCR Meter
Troubleshooting
Troubleshooting Using Service Function
4-
Troubleshooting Using Service Function
The Keysight E4980A/ E4980AL has a service function to diagnose the analog
measurement section, digital section, and internal DC power supply voltages.
The Power On Test or Self Test of the service function makes it possible to
isolate a faulty board assembly.
Power On Test
The Power On Test always takes place once the E4980A/ E4980AL is turned
on. When a failure is detected, a message "Power on test failed" is displayed in
the system message area and the normal measurement screen does not
appear (Service Mode). The Service Mode is a state that occurs when the
power-on test fails. Here, the characters on the display turn yellow and all of
the front panel keys are unavailable.
Contents of the power on test results
The Power On Test contains tests as shown in Table 4-2. If the power on test is
failed, an error code or an error message is also displayed. You can identify a
failure section with the error code or the error message. The error code or error
message is related to each test group as shown in Table 4-2. For example, the
first item of the error code is for CPU test group, second item is for System test
group, and seventh item is for A3 test group. The value for each test group is
given in hexadecimal.
Example of error code: Power on test failed: 0,0,0,0,0,3f,1f
Self Test
The Self Test can perform some test items of the power on test. Pressing the
[System] key followed by the SELF TEST softkey opens the SELF TEST page.
The SELF TEST page, intended for maintenance and repair, allows you to check
the digital and analog behavior of E4980A/ E4980AL. You can choose one of
the available test items with the cursor placed in the corresponding field
(parenthesized field).
• Choosing a Test Item (TEST No. field)
Figure 4-4 shows the fields available on this page along with the softkeys
corresponding to them.
When you want to use the front panel keys in the Service Mode while
carrying out any repairs to the unit, Power Switch + Preset keys can be
pressed. The characters on the display turn yellow too, but you can use all
keys.
When the test no.1 or 2 of System test group fails, tests of A1, A2, A3 test
groups are not performed. In case of this failure, the value for the fifth,
sixth, and seventh item is indicated as ffff.
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