10-8 Service Guide
Service Key Menus and Error Messages 8719ET/20ET/22ET
Service Menus - Internal Diagnostics 8719ES/20ES/22ES
RF Network Analyzers
Self Diagnose Softkey
You can access the self diagnosis function by pressing
. This function examines, in order, the pass/fail status of all internal
tests and displays NO FAILURE FOUND if no tests have failed.
If a failure is detected, the routine displays the assembly or assemblies most probably
faulty and assigns a failure probability factor to each assembly.
Test Descriptions
The analyzer has up to 80 routines that test, verify, and adjust the instrument. This
section describes those tests.
Internal Tests
This group of tests runs without external connections or operator interaction. All return a
PASS or FAIL condition. All of these tests run on power-up and preset except as noted.
0 ALL INT − Runs only when selected. It consists of internal tests 3-11,
13-16, and 20. Use the front panel knob to scroll through the tests and see
which failed. If all pass, the test displays a PASS status. Each test in the
subset retains its own test status.
1 PRESET − Runs the following subset of internal tests: first, the
ROM/RAM tests 2, 3, and 4; then tests 5 through 11, 14, 15, and 16. If any
of these tests fail, this test returns a FAIL status. Use the front panel knob
to scroll through the tests and see which failed. If all pass, this test
displays a PASS status. Each test in the subset retains its own test status.
This same subset is available over GPIB as “TST?”. It is not performed
upon remote preset.
2 ROM − Part of the ROM/RAM tests and cannot be run separately. For
more information, refer to Chapter 6 , “Digital Control Troubleshooting.”
3 SRAM RAM − Verifies the A7 CPU SRAM (long-term) memory with a
non-destructive write/read pattern. A destructive version that writes over
stored data at power on can be enabled by changing the 4th switch position
of the A7 CPU switch as shown in Figure 10-2.
System
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