4 Assembly Level Troubleshooting
124 Keysight 3458A Assembly-Level Repair Manual
An error message is composed of two different parts, a number and a
corresponding message that explains the failure. For example, the error message
for an AC board failure looks like the following:
202, “HARDWARE FAILURE -- SLAVE TEST: AC BOARD”
The first number (2) in the message shows that this is a “200” series message. All
hardware errors are stored as “200” series numbers. The other two numbers (02)
show in what auxiliary error register the message is located. In the example, this is
auxiliary register 2 (as in number 02).
This number also determines in which order the error messages are to be stored
and displayed. This is done since more than one error message can be detected
and stored into the registers. The lowest number is always stored and displayed
first. Once it is displayed, the next lowest number can then be displayed, and so
on. Use the blue “SHIFT” and “Error” keys combination to display the other
messages.
Self-test failure troubleshooting
Before doing any self-lest failure troubleshooting, go to the Power Supplies
Troubleshooting procedures in this chapter of the manual to check the Outguard
and Inguard Power Supplies.
If the power supplies check good, use the procedure in the previous paragraph to
display the error messages. Then refer to Table 4-2 to determine the most likely
cause of the self-test failure. Do this for all error messages recorded in the error
registers. Refer to the Assemblies Removal/Installation Procedures in Chapter 3 of
this manual to replace a defective assembly.
Remember, you need to use the left and right arrow keys to view the complete
message.
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