Troubleshooting
2-22
Test 105.8 — Group Execute Trigger (GET)
Type
Pass/Fail
Fault message
Open IEEE-488 GET
Description
Trigger 8 (STI8) is set up as an input, and the 9914 (U622) is then programmed to generate a
GET signal.
Drawing reference
Digital Board; 2002-140
Components
U618 and U622.
Test 105.11 through 105.18 — Trigger shorts
Type
Pass/Fail
Fault message
None
Description
In test 105.11, STI1 is programmed as the trigger input. Each of the other triggers (STI2 through
STI7 and GET) is programmed to toggle in sequence. If a trigger is detected at STI1, a short is
indicated and the test fails. The test is repeated for STI2 through STI8 in tests 105.12 through
105.18.
Ordinarily, Built-In-Tests should be run with no external connections. However, the Trigger
Shorts tests may be used to verify proper operation at the external trigger bus connector (J1029,
J1030). For example, by shorting pins 1 and 2, tests 105.11 and 105.12 should fail, indicating
that the short was detected between system trigger 1 and system trigger 2.
Drawing reference
Digital Board; 2002-140
Components
J1029, J1030, and associated circuitry.
