Agilent Technologies 85032B/E 50 Specifiche Pagina 153

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8712ET/ES and 8714ET/ES Troubleshooting and Block Diagrams
RF Network Analyzers Category 1 Failures: Dead or No Display
Service Guide 4-11
5. If an error occurs while firmware is being loaded (after 2 beeps are heard)
Reload the firmware from disk by inserting the firmware disk into the internal disk
drive and switching the analyzer's line power on. Press at the
Load firmware?
query. The process will take a few minutes. Watch the CRT for information during the
loading procedure.
If the analyzer locks up during or after the firmware loading, try clearing the SRAM:
a. Cycle the analyzer's power.
b. After about 8 seconds, the analyzer will emit a double beep. Immediately after this
double beep, press several times.
c. The analyzer will pause after performing the CPU main self-tests and ask if you
want to zero the SRAM. Answer YES by pressing the key. Reload the
firmware from disk again.
6. If a self-test fails
The analyzer indicates the number of the first failed self-test in two ways:
An error message appears on the CRT, if possible.
The “Test Status” LEDs display a number code corresponding to the number of the
failed test.
Test Status LEDs
These include one red LED, one green LED, and a 7-segment LED which display the digits
0 through 9. The viewing hole is located to the left of the GPIB connector behind the metal
backplane cover. The red and green LEDs are located to the left of the 7-segment LED
when viewed from the rear panel.
Test Status LED codes
Below is a list of LED configurations.
Red LED and 7-segment LED on: test numbers 1 through 9, as shown on 7-segment
display.
Green LED and 7-segment LED on: tests 10 through 19. Add 10 to value shown on
7-segment display.
Only green LED on: all self-tests passed.
Table 4-1 lists the power-up self-tests by number, with a description of the error messages
and troubleshooting information. Some of the troubleshooting hints may require the use of
a service extender board. Reference designators for main ICs are noted on the PC boards.
Note that replacing the defective board is always an option; you need not troubleshoot to
the component level.
Check the Test Status LEDs, then locate that test number in the table to determine what
to do. For test numbers above 19, the name of the test is usually in the failure message, so
look for the test name in Table 4-1 on page 4-13. Refer to Table 5-1, “Analyzer Self-Tests,
on page 5-5, for detailed descriptions of each test.
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