GENERAL MAINTENANCE AND PREVENTIVE MAINTENANCE PROCEDURES.

TB 11-5820-890-12

3-3. GENERAL MAINTENANCE AND PREVENTIVE MAINTENANCE PROCEDURES.

Anytime the ANCD is not functioning properly every effort shall be made at the operator level to determine that the

equipment is indeed failing. The ANCD will be forwarded to the Unit Level communications maintainer (MOS 31V)

to verify the failure. The procedures to determine that the ANCD is Not Mission 'Capable (NMC) can be found in

3-4. VISUAL INSPECTION.

Visually inspect the ANCD case for cracks, chips, or broken parts. Inspect the connectors for loose or damaged

pins. Check the mechanical operation of the keypad. Check the Liquid Crystal Display (LCD) for damage.

3-5. CLEANING.

Clean the outside of the equipment with a clean, dry cloth to remove any accumulated dirt, corrosion or mildew. The

case of the ANCD is designed to prevent dust or dirt from entering the unit; therefore, Internal cleaning is not

necessary or possible.

3-6. TOOLS AND TEST EQUIPMENT.

The ANCD requires only a flat blade screwdriver or coin to open the battery compartment to replace the battery.

3-7. BATTERY REPLACEMENT.

Battery replacement intervals depend upon the operational use of the ANCD and environmental conditions at the

time of use. Battery capacity is a direct function of temperature. Normal use of the ANCD will require battery

replacement approximately every 30 days if the ANCD were to be used for an average of one hour every day. If the

ANCD is placed into storage with data stored in the database, the battery life expectancy is approximately 119 days,

maximum. At the end of this time period, the battery should be changed before operation to insure that database

data is not lost. The ANCD employs two built-in battery power monitoring functions: Low Battery Indicator and Very

Low Battery Detector.

Low Battery Indicator. When the ANCD detects a low battery condition the display will show the following

ICON message: LOW BAT. This message is displayed continuously after detection and will allow enough

time for the current operation to be completed by the operator before replacing the battery set.

Very Low Battery Detector. The ANCD contains test circuitry to monitor the battery voltage for a low volts

condition. When the Low Voltage Detector (LVD) is activated, an immediate alarm function becomes active.

This alarm occurs at a point where there is sufficient power available to successfully process the alarm and

shut the ANCD down in an orderly, secure fashion. The battery must be replaced as soon as possible to

prevent data loss.

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