Service Guide 5-9
8719ET/20ET/22ET Power Supply Troubleshooting
8719ES/20ES/22ES If the Red LED of the Preregulator (A15) Is On
RF Network Analyzers
If the Red LED of the Preregulator (A15) Is On
If the red LED is on or flashing, the power supply is shutting down. Use the following
procedures to determine which assembly is causing the problem.
Check the Post Regulator (A8)
1. Switch off the analyzer.
2. Disconnect the cable (A15W1) from A8. (See Figure 5-5.)
3. Switch on the analyzer and observe the red LED on A15.
• If the red LED goes out, the problem is probably A8. To first verify that the inputs to
A8 are correct, continue to “Verify the Preregulator (A15)” on page 5-10.
• If the red LED is still on, the problem is probably A15, or one of the assemblies
obtaining power from it. Go to “Check for a Faulty Assembly” on page 5-11.
Figure 5-5 Power Supply Cable Locations
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