Figure 20: Location And Orientation Of Real-Time Clock Battery In Cpe330 - GE PACSystems RX7i Reference Manual

Chapter 2. CPU Features & Specifications
Replacement of Real-Time Clock Battery on CPE330
The CPE330 is shipped with a real-time clock (RTC) battery installed
(see Figure 20). There is no isolation barrier between the battery and
the circuit. This battery will need to be replaced periodically. Typically,
no action is required during initial installation.
Should the RTC battery fail, the CPU date and time will be reset to
12:00 AM, 01-10-2000 at start-up. The CPU operates normally with a
failed or missing RTC battery; however, the initial CPU time-of-day
(TOD) clock information will be incorrect.
There are no diagnostics or indicators to monitor RTC battery status.
The RTC battery has an estimated life of 5 years and must be replaced
every 5 years on a preventative maintenance schedule.
To replace a depleted battery,
1. Power down the RX3i rack.
2. Disconnect cables attached to the CPE330 module, labeling each
for later reconnection.
3. Remove the CPE330 module.
4. Take the CPE330 module to a clean environment.
5. Place the module on a workbench with the heat-sink side down.
6. With ESD protection in place, remove the four screws holding the
upper side sheet metal in place.
7. Remove the sheet metal. This exposes the circuit board,
connectors and coin battery shown in Figure 20.
8. Using a non-conductive
simultaneously hold back the retaining clip so it is clear of the
battery.
9. Remove the depleted battery and dispose of it by an approved
method.
10. Install the replacement battery so that the inscribed positive face is towards the green connector
(i.e. downwards as shown in Figure 20).
11. Check that the retaining clip has engaged the edge of the newly installed battery.
12. Replace the sheet metal cover.
13. Tighten all four retaining screws to 0.9Nm (8 in-lbs).
14. Restore the CPE330 module to its original location and secure it in place.
15. Reconnect all cables to their original connectors.
16. Turn power on to the RX3i rack.
17. If needed, set the current date and time via PME or using SVC_REQ 7 (refer to PACSystems RX7i
and RX3i CPU Programmer's Reference Manual, GFK-2950 Chapter 6).
Note: Battery replacement on CPE302/CPE305 & CPE310 is different: see Figure 25.
66
pliers, grip
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
the battery and
Figure
Orientation of Real-Time Clock
Battery in CPE330
20: Location and
GFK-2222AD