Publication 2364F-5.05 - March 1999
4-6
Testing Components
Replacing the Battery for the Battery-Backed Memory on the Main
Control Board
Replacing the battery on the main control board (U11) will erase all
modified parameters. Record parameters before replacing the battery.
1. Push the disconnect lever to off and wait for all voltage to discharge
from the unit. Do not continue until all voltage has dissipated from the
DC bus.
2. Verify that there is no voltage across the DC bus (see Figure 4.12 and
Figure 4.13 for check points).
3. Verify that there is no voltage across the terminals and subcomponents
of the main control board.
4. Put on an electrostatic discharge (ESD) protective strap and connect the
strap to one of the door latches.
5. Grasp the battery, from the top and bottom, and gently pull the battery
off of U11 as shown in Figure 4.3 (note the orientation of the battery).
6. Gently press the new battery into place (the battery can only be installed
in one orientation).
7. Properly dispose of the lithium battery according to your local
ordinances and company procedures.
Figure 4.3
Replacing the Battery for the Battery-Backed Memory
Battery-Backed
Memory (U11)
Lithium Battery and Crystal Package (2.8V, 49mAh)
See publication 1756-5.68 for guidelines
concerning lithium battery disposal.