Figure 3-30. Control Top Block Diagram; User Interface - Motorola APX 3000 Detailed Service Manual

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Table of Contents

3.2.6.1 Top Control

The Top Control contains an ON/OFF switch and a programmable push button. The Top Control

also includes a TX/RX LED that is solid amber upon receive, red on PTT, and blinks amber on

secure RX and Bluetooth LED. The Top Control components are mounted on flex which connects to

the Main board connector J1 and J2.

When the On/Off switch is pushed to ON (green), the switch is grounded and Mech_Sw is pulled low.

Mech_Sw is an input to MAKO (U6501). The logic low input enables an external FET (Q6501) gate

voltage, FET_ENX, which switches UN_SW_B+ to SW_B+ and turns the radio on.

The programmable Top Button is by default used for Bluetooth on/off. It is also biased to

1.875 V (R6507) and is an input (EMERG_BTN_X) to the CPLD and MAKO. A button press is

detected when EMERG_BTN_X is pulled low.

Programmable

ON/OFF Switch

Figure 3-30. Control Top Block Diagram

Theory of Operation

: Controller