Maintenance
6.2 Battery
6.2.1 Checking the Battery
The battery is a long-life lithium battery, but it is important to monthly monitor the
strength of this battery. See Table 2-6 for more specific information about the
VCPU battery. If the battery sufficiently discharges, all NVRAM parameters will be
lost including the following:
• Modeling data
• Site data
• Targets
• Time/Date
To check if the battery’s charge is low, from the Main Menu, select Display system
status…, then Hardware diagnostics… and finally VCPU hardware diagnostics. If
the battery charge is low, “3.0V Battery Low” will be highlighted in reverse type.
6.2.2 Replacing the Battery
It is possible to replace the battery without losing any parameters.
NOTE: The battery must not be out of the socket more than 20 seconds or the
NVRAM parameters and/or real time clock information may be lost
Before removing the original battery, acquire a replacement battery; General
Dynamics part #BBA003 (Panasonic CR2354).
This 3V Lithium coin-type battery can be carefully pried out with a small
screwdriver and the new battery can be replaced in reverse fashion.
IMPORTANT: The “+” side of the battery faces up.
6.3 Power Entry Module Fuse
If the fuse in the ACU’s Power Entry Module needs replacement, use a fuse that
meets the following criteria: 5x20mm 2A/250V Slo-Blo Time Lag Fuse.
6-2
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