Chapter 3 Dc Power Distribution; Dc Regulation And Distribution; Figure 3-1. Dc Power Distribution Block Diagram - Motorola P100 Series Detailed Service Manual

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Chapter 3 DC Power Distribution

A block diagram of the DC power distribution throughout the radio is shown in Figure 3-1.

Battery voltage enters at connector J602 and is routed through SW/VOL1 to become SWB+.

This voltage is routed to:

• TX power amplifier Q403 (via R417)

• APC circuit U401

• RX audio power amplifier U601

• 5V regulator (U505)

• 3.3V regulator (U506)

• Voltage divider R153/R154, a microprocessor A/D input which measures battery voltage

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Audio filter

Digital potentiometer