Major Assemblies - Motorola APX 1000 Basic Service Manual

3-2
3.1

Major Assemblies

The ASTRO APX 1000 radio includes the following major assemblies
(See Figure 3-1.):
• Main Board – Contains all transmit, receive, and frequency generation circuitry, including the
digital receiver back-end IC and the reference oscillator. The main board also contains a dual
core processor, which includes both the microcontroller unit (MCU) and a digital signal
processor (DSP) core, the processors's memory devices, an audio and power supply support
integrated circuit (IC), a digital support IC, external power amplifier as well as combination
Global Positioning System (GPS) and front end circuitry.
• Control Top – Contains a Multi-Function knob, a push button switch used for Emergency call
and a light bar. The control top also includes TX/RX LED that is solid amber upon receive, red
on PTT, and blinks amber on secure TX/RX.
• Main Display – 160 pixels x 90 pixels, transflective color LCD.
• Keypad
- Standard Control (M1.5) Keypad version has 3 soft keys
- Limited Keypad Version has 3 soft keys, 4 direction Navigation key, Home and Data but-
tons
- Full Keypad Version has 3 soft keys, 4 direction Navigation key, 3x4 alphanumeric keypad,
Home and Data buttons.
RF and GPS Antenna
Main
Board
Figure 3-1. APX 1000 Overall Block Diagram
Basic Theory of Operation: Major Assemblies
Keypad
Front
Display
Controls
Top
External Accessory
Connector