External Battery - Compaq AP400 Maintenance And Service Manual

3-48 Removal and Replacement Procedures

External Battery

The real-time clock battery that came with the workstation is permanently installed on the
system board with tray. If the original battery becomes inoperative, you must install a second
battery.
NOTE: It is important to make a set of backup diagnostics diskettes before you install a new
battery.
To install the external real-time clock battery:
1. Perform the service preparations described on page 3-2.
2. Remove the following components:
workstation cover
I/O bracket assembly (expansion board bracket)
3. Remove the backing from the adhesive on the hook-and-loop fastener strip.
4. Connect the battery to J5 pins 1 - 4.
Figure 3-46. Attaching the replacement battery
WARNING: The system board with tray contains a clock/CMOS lithium battery.
The lithium battery may explode if mistreated. The battery is soldered in and may
not be removed. Do not abuse or disassemble. Use only replacement batteries
supplied by Compaq Computer Corporation.
CAUTION: Electrostatic discharge can damage electronic components. Be sure
you are properly grounded before beginning any installation procedure. See
"Electrostatic Discharge Information" in Chapter 2 for more information.
1