4-16 Service Guide
Start Troubleshooting Here 8719ET/20ET/22ET
Digital Control Check 8719ES/20ES/22ES
RF Network Analyzers
Verify Internal Tests Passed
1. Press the following:
The display should indicate:
TEST
0 ALL INT PASS
• If your display shows the above message, go to step 2. Otherwise, continue with this
step.
• If phase lock error messages are present, this test may stop without passing or
failing. In this case, continue with “Source Check” on page 4-17.
• If you have unexpected results, or if the analyzer indicates a specific test failure,
refer to Chapter 5 , “Power Supply Troubleshooting.” The analyzer reports the first
failure detected.
• If the analyzer indicates failure but does not identify the test, press to search
for the failed test. Then refer to Chapter 6 , “Digital Control Troubleshooting.”
Likewise, if the response to front panel or GPIB commands is unexpected,
troubleshoot the digital control group.
2. Press to perform the Analog Bus test.
• If this test fails, refer to Chapter 6 , “Digital Control Troubleshooting.”
• If this test passes, continue with “Source Check” on page 4-17.
Preset
Preset
System
19 x1
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