Specifications

4.12 Replacing the Real-Time Clock Chip

This section describes how to replace and dispose of the real-time clock chip on

the system board. A lithium battery inside the real-time clock chip provides

power for the CMOS RAM which holds system conﬁguration information.

Caution

The real-time clock chip contains a lithium battery. It is sealed and

should not be opened. To prevent explosion, avoid shorting the battery.

Do not attempt to recharge it.

For safe operation of this computer system, replace the real-time clock

chip with the recommended Digital part (DS1287).

The following steps describe how to remove and dispose of the real-time clock

chip.

1. If you have not created a SYSTEM.SCI ﬁle on your system conﬁguration

diskette, create one using the SCU. For information on conﬁguring the

system with the SCU, refer to Chapter 5.

2. Shut down the system and unplug the power cord (Section 4.4).

3. Remove the cabinet top cover, left side panel, and card cage cover using the

procedure in Section 4.5.

4. Remove the CPU module using the procedure in Section 4.6.

5. Remove the memory module retaining bar, and the memory module (if one

is present), using the procedure in Section 4.9.

6. Remove any option modules installed in the EISA bus slots using the

procedure in Section 4.10.

7. Locate the real-time clock chip on the system board (Figure 4–11 and

Table 4–13).

4–26 FRU Removal and Replacement