Chapter 1: Functional Description
System Functions
1-12 Service Manual
Note: A system failure on the screen indicates the main application processor has detected abnormal
function in the system. A blank screen with a high-priority alarm indicates a problem with the main
application processor. Refer to “4.4 Troubleshooting Tables” for more information.
1.3.4 Battery Management
A lithium ion rechargeable battery is located on the Control Board. The audio processor provides charge
control and monitoring of the battery. (Refer to Figure 1-7.) The battery management integrated circuit
provides proper charging profile to prevent damage to the battery. The battery management circuitry
prevents over-discharge of the battery and system damage in the event of reverse polarity installation. In
the event of battery failure or low charge, a “super” capacitor provides one cycle (ten minutes) of power fail
indication.
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