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 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 DTR
5-1
Summary of Contents for CG-1220
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