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This section provides troubleshooting procedures for HSD units experiencing faults during the 
commissioning process or previously operational units now considered as “not working”.

Troubleshooting procedures require data obtained using the Maintenance Utility Program 
feature of the HSD units. Refer to "HSD Maintenance Utility Program" on page 4-3 for specific 
instructions on how to access and use the Maintenance Port and Maintenance Utility Program 
of the unit.

(1) Non-specific Complaints

When troubleshooting units with non-specific complaints, complete all system 
verification and functional tests in "Operational and Diagnostic Test Procedures" on 
page 4-48. Document whether the unit passes or fails each test.

If the unit passes all tests and no fault is discovered, all associated equipment and 
aircraft wiring should be tested. 

If the unit fails a specific test, isolate the actual fault or faults by performing 
troubleshooting procedures provided in this section.

(2) Specific Complaints

When troubleshooting units with specific complaints, service personnel may choose 
not to complete some or all of the diagnostic tests and proceed directly to the 
applicable troubleshooting and fault isolation procedure provided in this section.

Equipment required for troubleshooting and fault isolation is the same as the equipment 
required for test purposes as listed in page 2. 

This section presents examples of maintenance screens and troubleshooting tables to 
assist in troubleshooting and fault isolation activities. The exact screen display may vary 
depending on the version of the unit’s operational software and installation configuration 
mode. 

The screens used in the figures presented in this section may have been edited for 
clarity and for illustrative purposes.

(1) Fault Isolation Screen Displays

Figure 4–48 to Figure 4–54 provide example maintenance screens for reference and 
illustration purposes.