Table 7-1, Continuation Troubleshooting - Racal Instruments 1269 User Manual

1269 User Manual
PROBLEM
Voltage alarm condition.
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Airflow alarm condition
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Table 7-1, Continuation Troubleshooting

POSSIBLE CAUSES
•
Faulty VXI module
installed or voltage
fault occurred
•
VXI supply is out of
tolerance
•
Module temperature
rise or max ambient
limit exceeded
or
Insufficient module
cooling air
•
Fan speed tolerance
limit exceeded
WHAT TO DO
•
Cycle power.
•
If fault persists remove installed VXI
modules until fault
cleared.
•
Perform Basic Functional Check
procedure from Chapter 3.
•
For EMS equipped mainframe check
VXI supply voltage levels and that
alarm limits are valid. (See Chapter
4)
•
Check ) ) T and T
max
panel (EMS option).
•
Check for restrictions to airflow at
mainframe intake and exhaust.
•
Check fan TACH outputs at rear
panel (EMS option).
•
Query EMS to
temperature, slot temperature rise,
and fan speed to verify values and
limits. Refer to Chapter 4.
•
Clean mainframe module cooling fan
filter.
•
Check fan TACH output at rear panel
•
Query EMS to check fan speed value
and to verify limits. Refer to Chapter
4.
•
Check for restrictions to airflow at
mainframe intake and exhaust.
•
Clean mainframe module cooling fan
filter.
indication is
outputs at rear
check ambient
Maintenance 7-13