General Dynamics DIGITAL TRACKING RECEIVER - 5 Maintenance; Inspection and Preventive Maintenance; Checking the Battery; Replacing the Battery

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Maintenance

5.0 MAINTENANCE

5.1 Inspection and Preventive Maintenance

Scheduled maintenance should include the following:

 Check the inside of the unit for excessive dust accumulation every 6 to 12

months. If excessive dust is found, disconnect the power cord from the DTR and

remove the dust using a clean, dry (non-oiled) high-pressure air source.

 Check and clean the fan filter, accessible from back of unit, whenever dirty to

avoid overheating which may degrade system performance. Before removing

the filter, turn the power switch on the DTR to the off position and remove the

cover to the DTR. To remove the filter, remove the 4 flat head screws on the

rear panel side of the plastic housing of the exhaust fan and filter, making sure

to keep track of the washers and nuts on the inside of the unit as the screws

are removed. The plastic cover and filter can then be removed and cleaned with

a high-pressured hose. If the filter needs to be replaced, replace it with General

Dynamics part #BFN011. Replace the filter and secure the fan housing by re-

installing the 4 screws, washers, and nuts.

 Replace batteries for non-volatile memory as required. The long life battery

ensures that user parameters are stored when the unit is powered off. The

battery is a long-life lithium battery, but it is important to monthly monitor the

strength of this battery. If the battery sufficiently discharges, all NVRAM

parameters will be lost including the following:

 Frequency

 Time/Date

Checking the Battery

To check if the battery charge is low, remove the top cover and locate the CPU

board. This is the large board closest to the front panel on the right side when

viewing from the front of the unit. The battery is located in the socket on the right-

side of the board. Using a voltmeter, place the positive probe on the top of the

battery and the negative probe on the side of the battery. A good battery will

measure around +3 VDC.

Replacing the Battery

It is possible to replace the battery without losing any parameters.

NOTE: The battery must be removed while the power is applied to the unit or the

NVRAM parameters and/or real time clock information may be lost. If removed

with the unit in the powered-off state, then NVRAM parameters may be lost.

CG-1220 DT

5-1