Specifications

Theory of Operation
EPC-100 Hardware Reference 4-10
Battery
The battery powers the CMOS RAM and TOD clock when system power is not
present. At 60°C, the battery should have a shelf life of over four years. In a system
that is powered on much of the time and where the ambient power-off temperature is
less than 60°C, the battery is estimated to have a life of 10 years.
If system power is present, the +5V voltage also powers the CMOS RAM and TOD
clock. This is done with the RTC chip's internal isolation diodes, so that either the
onboard battery or the +5V power supply voltage can supply power and neither
power source affects the other.
The 3.0V lithium battery supplied with the EPC-100 is a Renata CR2032 “coin cell”
or equivalent. It is mounted on the main circuit board, beneath the EPC-100 Video
Board. Should the battery fail, you may obtain and install a replacement.
Write down all of the CMOS setup parameters while the battery is still good, or save
them, using the CMOS save and restore feature of the BIOS configuration Exit
Menu.
To replace the battery:
1. Turn off the power and remove the EPC-100 from the cPCI chassis.
+ IMPORTANT: You should perform all of these steps in a static-free or
ESD-protected environment.
2. Remove the two jack screws securing the SVGA connector to the front panel.
3. Remove the five screws securing the I/O board (the narrow board with the serial
and parallel port connectors) to the main board and the six jack screws securing
the serial and parallel port connectors to the front panel.
4. Remove the I/O board.
5. Remove the two screws securing the video board to the main board.
6. Remove the video board.
7.
Locate the battery, then
slide the old battery out in the direction shown in Figure
4-3.
8. Slide the new battery into place, positive (+) side up
9. Reassemble the EPC-100.