Noisy Blower Fan

TM 11-7021-202-12

It is very important that the Operator and maintenance personnel ensure that the

environment around the processor is such that the airflow through and around the unit is not

restricted or the air temperature is above requirements (table 1-2).

Noisy Blower Fan. In the event that the units blower fan becomes noisy, the

processor is removed and replaced with an operational spare (para 4-14).

PWR ON/RESET Indicator Not Lit. If the PWR ON/RESET indicator won't light,

replace the defective processor with an operational spare (para 4-14).

BATT Indicator Not Lit. If the BAIT indicator on a semiconductor-based processor

won't light and the PWR ON/RESET is lit, the repair activity is beyond the scope of this

manual. Replace the defective processor with an operational spare (para 4-14).

NOTE

The ETM indicator can be checked by

observing the movement of the flag between

the first and second digits.

f. Defective ETM Indicator. A daily visual inspection of the Elapsed Time Meter

(ETM) will show if the meter is not functioning properly. When the meter is not operating

properly, replace the processor with an operative spare unit (para 4-14).

g. Program Won't Load. Failure of the program to load may be caused by a number

of things. The most probable cause is in the loading itself (i. e., improper address,

improper/incomplete equipment configuration, etc.). Refer to the system manual for proper

loading instructions. Another probable cause is the processor itself. If the cause is the

processor, replace the processor with a spare operative unit (para 4-14).

-- Processor Does Not Accept Data. Replace the defective processor with an

operational spare unit (para 4-14).

i. Processor Does Not Output Data. Replace the defective processor with an

opertional spare unit (para 4-14).

j. Processor Keeps Blowing Fuses. Replace the processor with an operational spare

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