6-12 Service Guide
Digital Control Troubleshooting 8719ET/20ET/22ET
Troubleshooting the GSP (A19) and the Display (A18) 8719ES/20ES/22ES
RF Network Analyzers
Run Display Tests 59-61
1. Press the following:
2. If the analyzer passes the test, the Test number, description and PASS is
displayed.
3. Press and perform display tests 59 through 61 (substitute the next test number
where was used). Watch for the analyzer display and front panel LEDs to flash.
• If the analyzer fails any of the tests (59 through 61), replace the A19 assembly.
• If all of the following is true, replace the A18 display assembly.
— CPU passes the LED test.
— GSP passes all of the internal display tests (59 through 61).
— Power supply checks out.
Preset
Preset
System
59
59
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