Protogate Freeway 3414, Hardware Maintenance Manual, Page: 52 / 72

52 DC 900-2031A
Freeway 3414/3414R Hardware Maintenance Guide
4.5 Replacing a CPU CMOS Battery
The CPU board has a coin cell battery (BR2032) that maintains the CMOS memory
where the BIOS and Real Time Clock (RTC) values are kept when the Freeway system
is powered down and unplugged. On a Freeway system that is normally powered on, or
at least plugged in, the lifetime of this battery is over 10 years. If a system is regularly
unplugged, you can expect to replace the battery every 3 to 5 years.
Protogate recommends that the battery be replaced with a BR2032. The CR2032 is a
compatible replacement, but it may need to be replaced more often since it does not
have the same thermal range and lifetime stability as the BR2032.
Note
In order to retain the BIOS and RTC settings, you must replace the
CPU battery while the Freeway is plugged in.
To replace a CPU battery, use the following procedure:
1. Shut down and power off the Freeway using the procedure described in
Section 2.1 on page 28 .
2. Do not unplug the power cord(s) from the back of the Freeway cabinet. Also,
make sure that the power switch on the power supply is turned on.
3. Slip the anti-static strap around your wrist and attach the alligator clip to any bare
metal area of the Freeway cabinet.
4. Remove the top cover of the cabinet as described in Section 2.3 on page 32 .
5. Remove the board support bar by removing the screw at each end of it that holds
it to the cabinet and lifting the bar out of the way.
6. Locate the CMOS battery holder near the center of the CPU board as shown in
Figure 4–5 . You may have to move a few wires to get clear access to the holder.