Chapter 4 Assembly Level Troubleshooting 77
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 9 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.
"TEST VALUE OUT OF RANGE" Error Message
This error message indicates that a test did not meet certain pre-defined
limits. The number displayed next to the message indicates the test limit that
was exceeded during the test.
The number can be used to determine the assembly that caused the test to
fail. Numbers from 62 through 189 indicate a failure on the DC Circuitry
(A1) assembly. Numbers from 190 and above indicate a failure on the AC
Converter (A2) assembly. Refer to the Assemblies Removal/Installation
Procedures in Chapter 3 of this manual to replace a defective assembly.
Performance Test
Failures
Performance test failures are failures that may not be detected during the
self-test but are detected during the performance tests. These failures may
not be detected by the self-test due to the high accuracy of the 3458A.
Before assuming that a performance test has failed, you must make sure your
test equipment and performance test methods have sufficient accuracy to
check the 3458A. The 3458A is very accurate and needs very accurate
standards to determine if a performance test has failed or not. Be sure to read
the accuracy requirements in the 3458A Calibration Manual before
troubleshooting performance test failures.
If you are sure that the 3458A fails a performance test, determine what
function is inaccurate and then replace the appropriate assembly. The
following lists the functions and probable corresponding assemblies.
1. DC Volts Function Failure -- DC Circuitry (A1) assembly.
2. DC Current Function Failure -- DC Circuitry (A1) assembly.
3. OHMS Function Failure -- DC Circuitry (A1) assembly.
4. AC Volts Function Failure -- AC Converter (A2) assembly.
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