1261B User Manual
Racal Instruments
Ó
1995
Maintenance 7-17
PROBLEM
POSSIBLE CAUSES
WHAT TO DO
Voltage alarm condition.
·
Faulty VXI module
installed or voltage
fault occurred
·
VXI supply is out of
tolerance
·
Cycle power.
·
If fault persists remove installed
VXI modules until fault indication
is 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
)
Current alarm condition
·
VXI supply DC
output current
exceeds tolerance
·
Cycle power
·
Check current monitors using a
DMM at J415. See
Chapter 3
Rear Panel Connector
Reference
.
·
On EMS equipped mainframe
check current draw values and
limits from monitor. See
Chapter
4.
Temperature alarm
condition
·
Module temperature
rise or max ambient
limit exceeded
or
Insufficient module
cooling air
·
Check
)
T
and
Tmax
outputs at
rear panel.
·
Check for restrictions to airflow at
mainframe intake and exhaust.
·
Check fan
TACH
outputs at rear
panel.
·
Query EMS to check ambient
temperature, slot temperature
rise, and fan speed to verify
values and limits. Refer to
Chapter 4.
·
Clean mainframe module cooling
fan filter.
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