Racal Instruments 1261B User Manual page 159

PROBLEM
Airflow alarm condition
Maintenance 7-18
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POSSIBLE CAUSES
Fan speed tolerance
·
limit exceeded
1261B User Manual
WHAT TO DO
· Check fan TACH outputs at rear
panel
Query EMS to check fan speed
·
values and to verify limits. Refer
to Chapter 4.
Check for restrictions to airflow at
·
mainframe intake and exhaust.
Clean mainframe module cooling
·
fan filter.
Racal Instruments Ó 1995