Chapter 3 Theory of Operation
This chapter provides a detailed circuit description of the ASTRO APX 1000 mainboard and keypad
boards. When reading the theory of operation, refer to the appropriate schematic and component
location diagrams located in the back of this manual. This detailed theory of operation can help
isolate the problem to a particular component.
The ASTRO APX 1000 M1.5, APX 1000 M2 and APX 1000 M3 radio, which is a single-band
synthesized radio, is available in the following frequency bands.
• VHF (136–174 MHz)
• UHF1 (380–470 MHz)
• UHF2 (450–520 MHz)
• 700/800 MHz (764–870 MHz)
All ASTRO APX 1000 radios are capable of analog operation (12.5 kHz or 25 kHz bandwidths),
ASTRO mode (digital) operation (12.5 kHz only), X2-TDMA mode (25 kHz only) and Phase 2 TDMA
mode (12.5 kHz only).
The ASTRO APX 1000 radio (
Figure 3-1
) consists of the following:
•
Main Board
– Contains all transmit, receive, and frequency generation circuitry, including the
digital receiver back-end IC and the reference oscillator. The mainboard also contains a dual
core processor, which includes both the microcontroller unit (MCU) and a digital signal
processor (DSP) core, the processor’s memory devices, an audio and power supply support
integrated circuit (IC), a digital support IC, external power amplifier.
•
Top
Control –
Contains a Multi-Function knob, a push button switch used for Emergency call
and a light bar. The top control also includes TX/RX LED that is solid amber upon receive, red
on PTT, and blinks amber on secure TX/RX.
•
Main Display –
160 x 90 TFT transflective color LCD.
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......