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ART NUMBER FN091065, REVISION 2 VS5 N AND VS6 N SERVICE MANUAL
7-26 Section 7-4 - Performing Front End (FE) Diagnostics
PRELIMINARY
Section 7-4
Performing Front End (FE) Diagnostics
NOTE: When performing Front End Diagnostic tests, it is strongly recommended to start with the Full System
Test (FE and BEP) especially if the system shows signs of an intermittent problem. (For details, see 7-
3-1-1 "Full System Test (FE and BEP)" on page 7-22).
The Front End diagnostic tests can be initiated manually and may be performed in any order. However,
due to the functional dependencies between each of the Front End boards, it is recommended to
perform the tests on the boards in the following order:
1.) RFI board
2.) TR32 boards
3.) PIB board
4.) PSB board
Performing the tests in the proper sequence will help to derive the correct conclusions regarding the
source of the problem.
As described in this section, the testing sequence can be paused and restarted at any stage, providing
a quick and easy method of reviewing any detected faults. For instructions on performing a specific test,
refer to the relevant test in the appropriate sub-sections:
• Calibration Tests, as described in the 7-4-2 "Calibration Tests" on page 7-27.
• RFI Diagnostic Tests, as described in the 7-4-3 "Radio Frequency Interface (RFI) Diagnostic
Tests" on page 7-33.
• TR 32 Diagnostic Tests, as described in the 7-4-4 "TR 32 Diagnostic Tests" on page 7-47.
• Probe Interface Board Diagnostic Tests, as described in the 7-4-5 "Probe Interface Board
Diagnostic Tests" on page 7-62.
• Probe Select Board Diagnostic Tests, as described in the 7-4-6 "Probe Select Board
Diagnostic Tests" on page 7-63.
NOTE: If the system must be re-booted, do so. Continue testing from the point at which you were required to
reboot. If a failure occurs, re-boot the system and test again to verify the outcome of the test.
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