Removing And Replacing The Real-Time Clock Battery; Preliminary Requirements; Replacement - HP 743 Service Handbook

Removing and Replacing the Real-Time Clock Battery

This section provides step-by-step instructions for removing and replacing the real-time
clock in your Model 743.

Preliminary Requirements

WARNING:
Removal
Perform the following steps before removing the RTC battery from your Model 743:
1 Remove the 743 from it's chassis.
2 Remove any RAM or accessory cards installed at the board computer's left position.

Replacement

Follow these steps to replace the RTC battery:
1 Locate the battery behind the left RAM connector. It is held in place by a spring arm
marked with a "+".
2 Push the edge of the battery, slipping it out of place, and remove the battery.
3 Install the new battery with its `+' side up by slipping it under the spring arm - AVOID
LIFTING THE SPRING ARM.
Removing and Replacing the Real-Time Clock Battery
Lithium batteries may explode if mistreated. Replace
battery with only a Matsushita Electric BR-1616
three-volt lithium battery (HP part number 1420-
0525). Use of any other battery may cause fire or
explosion. Use the following guidelines when handling
old batteries:
Do not put lithium batteries in fires.
Do not try to recharge lithium batteries.
Do not disassemble lithium batteries.
Field Replaceable Units
5-33