CP150 /CP200. Commercial Series Two-Way Radio Detailed Service Manual

Transcription

1 CP0 /CP00 Commercial Series Two-Way Radio Detailed Service Manual

2 Product Safety and RF Exposure Compliance! C a u t i o n Before using this product, read the operating instructions for safe usage contained in the Product Safety and RF Exposure booklet enclosed with your radio. ATTENTION! This radio is restricted to occupational use only to satisfy FCC RF energy exposure requirements. Before using this product, read the RF energy awareness information and operating instructions in the Product Safety and RF Exposure booklet enclosed with your radio (Motorola Publication part number P09C9) to ensure compliance with RF energy exposure limits. For a list of Motorola-approved antennas, batteries, and other accessories, visit the following web site which lists approved accessories: Computer Software Copyrights The Motorola products described in this manual may include copyrighted Motorola computer programs stored in semiconductor memories or other media. Laws in the United States and other countries preserve for Motorola certain exclusive rights for copyrighted computer programs, including, but not limited to, the exclusive right to copy or reproduce in any form the copyrighted computer program. Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied, reproduced, modified, reverse-engineered, or distributed in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola products shall not be deemed to grant either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive license to use that arises by operation of law in the sale of a product. Document Copyrights No duplication or distribution of this document or any portion thereof shall take place without the express written permission of Motorola. No part of this manual may be reproduced, distributed, or transmitted in any form or by any means, electronic or mechanical, for any purpose without the express written permission of Motorola. Disclaimer The information in this document is carefully examined, and is believed to be entirely reliable. However, no responsibility is assumed for inaccuracies. Furthermore, Motorola reserves the right to make changes to any products herein to improve readability, function, or design. Motorola does not assume any liability arising out of the applications or use of any product or circuit described herein; nor does it cover any license under its patent rights nor the rights of others.

3 i Table of Contents Foreword Product Safety and RF Exposure Compliance... inside cover Computer Software Copyrights... inside cover Document Copyrights... inside cover Disclaimer... inside cover List of Figures... viii List of Tables...xi Related Publications...xi Chapter Test Equipment, Service Aids, and Service Tools Test Equipment Service Aids... - Chapter DC Power Distribution DC Regulation and Distribution... - Chapter Controller Theory of Operation Controller Microprocessor ry Memory Usage Control and Indicator Interface Serial Bus Control of Blocks Interface to RSS Programming Storage of Customer-Specific Information Sensing of Externally-Connected Accessories Microprocessor Power-Up, Power-Down and Reset Routine Boot Mode Control Microprocessor 7.97 MHz Clock Battery Gauge Audio ry Transmit and Receive Low-Level Audio ry Audio Power Amplifier Internal Microphone Audio Voice Path PTT s VOX Operation Battery Charging Through Microphone Jack Programming and Flashing Through Microphone Jack... - Chapter - MHz VHF Theory Of Operation Introduction VHF Receiver... -

4 ii Table of Contents.. Receiver Front-End Receiver Back-End VHF Transmitter Transmit Power Amplifier Antenna Switch Harmonic Filter Antenna Matching Network Power Control VHF Frequency Generation ry Fractional-N Synthesizer Voltage Controlled Oscillator (VCO)... - Chapter -7 MHz VHF Theory Of Operation Introduction VHF Receiver Receiver Front-End Receiver Back-End VHF Transmitter Transmit Power Amplifier Antenna Switch Harmonic Filter Antenna Matching Network Power Control VHF Frequency Generation ry Fractional-N Synthesizer Voltage Controlled Oscillator (VCO)... - Chapter VHF Troubleshooting Tables Troubleshooting Table for Receiver Troubleshooting Table for Synthesizer Troubleshooting Table for Transmitter Troubleshooting Table for Board and IC Signals Chapter 7 VHF Schematic Diagrams, Overlays, and Parts Lists Introduction Notes For All Schematics and Boards Six Layer Board Speaker and Microphone Schematic Speaker and Microphone Parts List Chapter 7 VHF (- MHz) Schematic Diagrams, Overlays, and Parts Lists (79Z0-A) Figure 7-. VHF (- MHz) Radio Block Interconnect Diagram (79Z0-A) Figure 7-. VHF (- MHz) Receiver Front End Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) Receiver Back End Schematic Diagram (79Z0-A) June, N-C

5 Table of Contents iii Figure 7-. VHF (- MHz) Synthesizer Schematic Diagram (79Z0-A) Figure 7-7. VHF (- MHz) Voltage Controlled Oscillator Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) Transmitter and Power Control Schematic Diagram (79Z0-A) Figure 7-9. VHF (- MHz) Controller Interconnect Schematic Diagram (79Z0-A) Figure 7-0. VHF (- MHz) Microprocessor ry Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) Audio ry Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) DC Regulation Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) Board Top Side View (79Z0-A) Figure 7-. VHF (- MHz) Board Bottom Side View (79Z0-A) VHF (- MHz) Radio Parts List (79Z0-A) Chapter 7 VHF - MHz Schematic Diagrams, Overlays, and Parts Lists (79Z0-C) Figure 7-. VHF (- MHz) Radio Block Interconnect Diagram (79Z0-C) Figure 7-. VHF (- MHz) Receiver Front End Schematic Diagram (79Z0-C) Figure 7-7. VHF (- MHz) Receiver Back End Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Synthesizer Schematic Diagram (79Z0-C) Figure 7-9. VHF (- MHz) Voltage Controlled Oscillator Schematic Figure 7-0. Diagram (79Z0-C) VHF (- MHz) Transmitter and Power Control Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Controller Interconnect Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Microprocessor ry Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Audio ry Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) DC Regulation Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Board Component Side View (79Z0-C) Figure 7-. VHF (- MHz) Board Solder Side View (79Z0-C) VHF (- MHz) Radio Parts List (79Z0-C) Chapter 7 VHF (-7 MHz) Schematic Diagrams, Overlays, and Parts Lists (Z09-A) Figure 7-7. VHF (-7 MHz) Radio Block Interconnect Diagram (Z09-A) Figure 7-. VHF (-7 MHz) Receiver Front End Schematic Diagram (Z09-A) Figure 7-9. VHF (-7 MHz) Receiver Back End Schematic Diagram (Z09-A) Figure 7-0. VHF (-7 MHz) Synthesizer Schematic Diagram (Z09-A) Figure 7-. VHF (-7 MHz) Voltage Controlled Oscillator Schematic Figure 7-. Diagram (Z09-A) VHF (-7 MHz) Transmitter and Power Control Schematic Diagram (Z09-A) Figure 7-. VHF (-7 MHz) Controller Interconnect Schematic Diagram (Z09-A) Figure 7-. VHF (-7 MHz) Microprocessor ry Schematic Diagram (Z09-A) Figure 7-. VHF (-7 MHz) Audio ry Schematic Diagram (Z09-A) Figure 7-. VHF (-7 MHz) DC Regulation Schematic Diagram (Z09-A) Figure 7-7. VHF (-7 MHz) Board Component Side View (Z09-A) Figure 7-. VHF (-7 MHz) Board Solder Side View (Z09-A) VHF (-7 MHz) Radio Parts List (Z09-A) N-C June, 00

6 iv Chapter 7 Table of Contents VHF (-7 MHz) Schematic Diagrams, Overlays, and Parts Lists (Z-C) Figure 7-9. VHF (-7 MHz) Radio Block Interconnect Diagram (Z-C) Figure 7-0. VHF (-7 MHz) Receiver Front End Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Receiver Back End Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Synthesizer Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Voltage Controlled Oscillator Schematic Figure 7-. Diagram (Z-C) VHF (-7 MHz) Transmitter and Power Control Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Controller Interconnect Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Microprocessor ry Schematic Diagram (Z-C) Figure 7-7. VHF (-7 MHz) Audio ry Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) DC Regulation Schematic Diagram (Z-C) Figure 7-9. VHF (-7 MHz) Board Component Side View (Z-C) Figure 7-0. VHF (-7 MHz) Board Solder Side View (Z-C) VHF (-7 MHz) Radio Parts List (Z-C) Chapter 7 VHF -7 MHz Schematic Diagrams, Overlays, and Parts Lists (79Z0-C) Figure 7-. VHF (-7 MHz) Radio Block Interconnect Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Receiver Front End Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Receiver Back End Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Synthesizer Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Voltage Controlled Oscillator Schematic Figure 7-7. Diagram (79Z0-C) VHF (-7 MHz) Transmitter and Power Control Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Controller Interconnect Schematic Diagram (79Z0-C) Figure 7-9. VHF (-7 MHz) Microprocessor ry Schematic Diagram (79Z0-C) Figure 7-0. VHF (-7 MHz) Audio ry Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) DC Regulation Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Board Component Side View (79Z0-C) Figure 7-. VHF (-7 MHz) Board Solder Side View (79Z0-C) VHF (-7 MHz) Radio Parts List (79Z0-C) Chapter 0-0 MHz UHF Theory Of Operation Introduction UHF Receiver Receiver Front End Receiver Back End UHF Transmitter Transmitter Power Amplifier Antenna Switch Harmonic Filter Antenna Matching Network Power Control UHF Frequency Generation ry Fractional-N Synthesizer...- June, N-C

7 Table of Contents v.. Voltage Controlled Oscillator (VCO)... - Chapter 9-70 MHz UHF Theory Of Operation Introduction UHF Receiver Receiver Front End Receiver Back End UHF Transmitter Transmitter Power Amplifier Antenna Switch Harmonic Filter Antenna Matching Network Power Control UHF Frequency Generation ry Fractional-N Synthesizer Voltage Controlled Oscillator (VCO) Chapter 0-9 MHz UHF Theory Of Operation Introduction UHF Receiver Receiver Front End Receiver Back End UHF Transmitter Transmitter Power Amplifier Antenna Switch Harmonic Filter Antenna Matching Network Power Control UHF Frequency Generation ry Fractional-N Synthesizer Voltage Controlled Oscillator (VCO) Chapter UHF Troubleshooting Tables Troubleshooting Table for Receiver Troubleshooting Table for Synthesizer Troubleshooting Table for Transmitter Troubleshooting Table for Board and IC Signals... - Chapter UHF Schematic Diagrams, Overlays, and Parts Lists Introduction Notes For All Schematics and Boards Six Layer Board...-. Speaker and Microphone Schematic Speaker and Microphone Parts List N-C June, 00

8 vi Chapter Table of Contents UHF (0-0 MHz) Schematic Diagrams, Overlays, and Parts Lists (Z0-O)... - Figure -. UHF (0-0 MHz) Radio Block Diagram (Z0-O)... - Figure -. UHF (0-0 MHz) Receiver Front End Schematic Diagram (Z0-O)... - Figure -. UHF (0-0 MHz) Receiver Back End Schematic Diagram (Z0-O) Figure -. UHF (0-0 MHz) Synthesizer Schematic Diagram (Z0-O)... - Figure -7. UHF (0-0 MHz) Voltage Controlled Oscillator Schematic Figure -. Diagram (Z0-O) UHF (0-0 MHz) Transmitter and Power Control Schematic Diagram (Z0-O) Figure -9. UHF (0-0 MHz) Controller Interconnect Schematic Diagram (Z0-O)... - Figure -0. UHF (0-0 MHz) Microprocessor ry Schematic Diagram (Z0-O) - Figure -. UHF (0-0MHz) Audio ry Schematic Diagram (Z0-O)... - Figure -. UHF (0-0 MHz) DC Regulation Schematic Diagram (Z0-O)... - Figure -. UHF (0-0 MHz) Board Component Side View (Z0-O)... - Figure -. UHF (0-0 MHz) Board Solder Side View (Z0-O)... - UHF (0-0 MHz) Radio Parts List (Z0-O) Chapter UHF (-70 MHz) Schematic Diagrams, Overlays, and Parts Lists (Z09-A)... - Figure -. UHF (-70 MHz) Radio Block Diagram (Z09-A)... - Figure -. UHF (-70 MHz) Receiver Front End Schematic Diagram (Z09-A)... - Figure -7. UHF (-70 MHz) Receiver Back End Schematic Diagram (Z09-A)... - Figure -. UHF (-70 MHz) Synthesizer Schematic Diagram (Z09-A)... - Figure -9. UHF (-70 MHz) Voltage Controlled Oscillator Schematic Diagram (Z09-A)... - Figure -0. UHF (-70 MHz) Transmitter and Power Control Schematic Diagram (Z09-A)... - Figure -. UHF (-70 MHz) Controller Interconnect Schematic Diagram (Z09-A) Figure -. UHF (-70 MHz) Microprocessor ry Schematic Diagram (Z09-A). - Figure -. UHF (-70 MHz) Audio ry Schematic Diagram (Z09-A) Figure -. UHF (-70 MHz) DC Regulation Schematic Diagram (Z09-A) Figure -. UHF (-70 MHz) Board Component Side View (Z09-A)... - Figure -. UHF (-70 MHz) Board Solder Side View (Z09-A)... - UHF (-70 MHz) Radio Parts List (Z09-A)... - Chapter UHF (-70 MHz) Schematic Diagrams, Overlays, and Parts Lists (Z-C) Figure -7. UHF (-70 MHz) Radio Block Diagram (Z-C) Figure -. UHF (-70 MHz) Receiver Front End Schematic Diagram (Z-C)... - Figure -9. UHF (-70 MHz) Receiver Back End Schematic Diagram (Z-C) Figure -0. UHF (-70 MHz) Synthesizer Schematic Diagram (Z-C) Figure -. UHF (-70 MHz) Voltage Controlled Oscillator Schematic Diagram (Z-C)... - Figure -. UHF (-70 MHz) Transmitter and Power Control Schematic Diagram (Z-C)... - Figure -. UHF (-70 MHz) Controller Interconnect Schematic Diagram (Z-C)... - Figure -. UHF (-70 MHz) Microprocessor ry Schematic Diagram (Z-C). - June, N-C

9 Table of Contents vii Figure -. UHF (-70 MHz) Audio ry Schematic Diagram (Z-C)... - Figure -. UHF (-70 MHz) DC Regulation Schematic Diagram (Z-C)... - Figure -7. UHF (-70 MHz) Board Component Side View (Z-C) Figure -. UHF (-70 MHz) Board Solder Side View (Z-C)... - UHF (-70 MHz) Radio Parts List (Z-C) Chapter UHF (-9 MHz) Schematic Diagrams, Overlays, and Parts Lists (Z0-O)... - Figure -9. UHF (-9 MHz) Radio Block Diagram (Z0-O)... - Figure -0. UHF (-9 MHz) Receiver Front End Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) Receiver Back End Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) Synthesizer Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) Voltage Controlled Oscillator Schematic Diagram (Z0-O) Figure -. UHF (-9 MHz) Transmitter and Power Control Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) Controller Interconnect Schematic Diagram (Z0-O) Figure -. UHF (-9 MHz) Microprocessor ry Schematic Diagram (Z0-O) -0 Figure -7. UHF (-9 MHz) Audio ry Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) DC Regulation Schematic Diagram (Z0-O)... - Figure -9. UHF (-9 MHz) Board Component Side View (Z0-O)... - Figure -0. UHF (-9 MHz) Board Solder Side View (Z0-O)... - UHF (-9 MHz) Radio Parts List (Z0-O) N-C June, 00

10 viii Table of Contents List of Figures Figure -. Programming/Test Cable... - Figure -. Wiring of the Connectors... - Figure -. DC Power Distribution Block Diagram... - Figure -. VHF Receiver Block Diagram...- Figure -. VHF Transmitter Block Diagram... - Figure -. VHF Frequency Generation Unit Block Diagram... - Figure -. VHF Synthesizer Block Diagram... - Figure -. VHF VCO Block Diagram Figure -. VHF Receiver Block Diagram...- Figure -. VHF Transmitter Block Diagram... - Figure -. VHF Frequency Generation Unit Block Diagram... - Figure -. VHF Synthesizer Block Diagram... - Figure -. VHF VCO Block Diagram Figure 7-. Six-Layer Board: Copper Steps in Layer Sequence Figure 7-. Speaker and Microphone Schematic Figure 7-. VHF (- MHz) Radio Block Interconnect Diagram (79Z0-A) Figure 7-. VHF (- MHz) Receiver Front End Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) Receiver Back End Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) Synthesizer Schematic Diagram (79Z0-A) Figure 7-7. VHF (- MHz) Voltage Controlled Oscillator Schematic Figure 7-. Diagram (79Z0-A) VHF (- MHz) Transmitter and Power Control Schematic Diagram (79Z0-A) Figure 7-9. VHF (- MHz) Controller Interconnect Schematic Diagram (79Z0-A) Figure 7-0. VHF (- MHz) Microprocessor ry Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) Audio ry Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) DC Regulation Schematic Diagram (79Z0-A) Figure 7-. VHF (- MHz) Board Top Side View (79Z0-A) Figure 7-. VHF (- MHz) Board Bottom Side View (79Z0-A) Figure 7-. VHF (- MHz) Radio Block Interconnect Diagram (79Z0-C) Figure 7-. VHF (- MHz) Receiver Front End Schematic Diagram (79Z0-C) Figure 7-7. VHF (- MHz) Receiver Back End Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Synthesizer Schematic Diagram (79Z0-C) Figure 7-9. Figure 7-0. VHF (- MHz) Voltage Controlled Oscillator Schematic Diagram (79Z0-C) VHF (- MHz) Transmitter and Power Control Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Controller Interconnect Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Microprocessor ry Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Audio ry Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) DC Regulation Schematic Diagram (79Z0-C) Figure 7-. VHF (- MHz) Board Component Side View (79Z0-C) Figure 7-. VHF (- MHz) Board Solder Side View (79Z0-C) Figure 7-7. VHF (-7 MHz) Radio Block Interconnect Diagram (Z09-A) Figure 7-. VHF (-7 MHz) Receiver Front End Schematic Diagram (Z09-A) Figure 7-9. VHF (-7 MHz) Receiver Back End Schematic Diagram (Z09-A) Figure 7-0. VHF (-7 MHz) Synthesizer Schematic Diagram (Z09-A) Figure 7-. Figure 7-. VHF (-7 MHz) Voltage Controlled Oscillator Schematic Diagram (Z09-A) VHF (-7 MHz) Transmitter and Power Control Schematic Diagram (Z09-A) June, N-C

11 Table of Contents ix Figure 7-. VHF (-7 MHz) Controller Interconnect Schematic Diagram (Z09-A) Figure 7-. VHF (-7 MHz) Microprocessor ry Schematic Diagram (Z09-A) Figure 7-. VHF (-7 MHz) Audio ry Schematic Diagram (Z09-A) Figure 7-. VHF (-7 MHz) DC Regulation Schematic Diagram (Z09-A) Figure 7-7. VHF (-7 MHz) Board Component Side View (Z09-A) Figure 7-. VHF (-7 MHz) Board Solder Side View (Z09-A) Figure 7-9. VHF (-7 MHz) Radio Block Interconnect Diagram (Z-C) Figure 7-0. VHF (-7 MHz) Receiver Front End Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Receiver Back End Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Synthesizer Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Voltage Controlled Oscillator Schematic Figure 7-. Diagram (Z-C) VHF (-7 MHz) Transmitter and Power Control Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Controller Interconnect Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) Microprocessor ry Schematic Diagram (Z-C) Figure 7-7. VHF (-7 MHz) Audio ry Schematic Diagram (Z-C) Figure 7-. VHF (-7 MHz) DC Regulation Schematic Diagram (Z-C) Figure 7-9. VHF (-7 MHz) Board Component Side View (Z-C) Figure 7-0. VHF (-7 MHz) Board Solder Side View (Z-C) Figure 7-. VHF (-7 MHz) Radio Block Interconnect Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Receiver Front End Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Receiver Back End Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Synthesizer Schematic Diagram (79Z0-C) Figure 7-. Figure 7-7. VHF (-7 MHz) Voltage Controlled Oscillator Schematic Diagram (79Z0-C) VHF (-7 MHz) Transmitter and Power Control Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Controller Interconnect Schematic Diagram (79Z0-C) Figure 7-9. VHF (-7 MHz) Microprocessor ry Schematic Diagram (79Z0-C) Figure 7-0. VHF (-7 MHz) Audio ry Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) DC Regulation Schematic Diagram (79Z0-C) Figure 7-. VHF (-7 MHz) Board Component Side View (79Z0-C) Figure 7-. VHF (-7 MHz) Board Solder Side View (79Z0-C) Figure -. UHF Receiver Block Diagram... - Figure -. UHF Transmitter Block Diagram... - Figure -. UHF Frequency Generation Unit Block Diagram... - Figure -. UHF Synthesizer Block Diagram... - Figure -. UHF VCO Block Diagram Figure 9-. UHF Receiver Block Diagram Figure 9-. UHF Transmitter Block Diagram Figure 9-. UHF Frequency Generation Unit Block Diagram Figure 9-. UHF Synthesizer Block Diagram Figure 9-. UHF VCO Block Diagram Figure 0-. UHF Receiver Block Diagram Figure 0-. UHF Transmitter Block Diagram Figure 0-. UHF Frequency Generation Unit Block Diagram Figure 0-. UHF Synthesizer Block Diagram Figure 0-. UHF VCO Block Diagram Figure -. Six-Layer Board: Copper Steps in Layer Sequence... - Figure -. Speaker and Microphone Schematic... - Figure -. UHF (0-0 MHz) Radio Block Diagram (Z0-O)... - Figure -. UHF (0-0 MHz) Receiver Front End Schematic Diagram (Z0-O)... - Figure -. UHF (0-0 MHz) Receiver Back End Schematic Diagram (Z0-O) N-C June, 00

12 x Table of Contents Figure -. UHF (0-0 MHz) Synthesizer Schematic Diagram (Z0-O)... - Figure -7. UHF (0-0 MHz) Voltage Controlled Oscillator Schematic Diagram (Z0-O) Figure -. UHF (0-0 MHz) Transmitter and Power Control Schematic Diagram (Z0-O) Figure -9. UHF (0-0 MHz) Controller Interconnect Schematic Diagram (Z0-O)... - Figure -0. UHF (0-0 MHz) Microprocessor ry Schematic Diagram (Z0-O) - Figure -. UHF (0-0MHz) Audio ry Schematic Diagram (Z0-O)... - Figure -. UHF (0-0 MHz) DC Regulation Schematic Diagram (Z0-O)... - Figure -. UHF (0-0 MHz) Board Component Side View (Z0-O)... - Figure -. UHF (0-0 MHz) Board Solder Side View (Z0-O)... - Figure -. UHF (-70 MHz) Radio Block Diagram (Z09-A)... - Figure -. UHF (-70 MHz) Receiver Front End Schematic Diagram (Z09-A)... - Figure -7. UHF (-70 MHz) Receiver Back End Schematic Diagram (Z09-A)... - Figure -. UHF (-70 MHz) Synthesizer Schematic Diagram (Z09-A)... - Figure -9. UHF (-70 MHz) Voltage Controlled Oscillator Schematic Diagram (Z09-A)... - Figure -0. UHF (-70 MHz) Transmitter and Power Control Schematic Diagram (Z09-A)... - Figure -. UHF (-70 MHz) Controller Interconnect Schematic Diagram (Z09-A) Figure -. UHF (-70 MHz) Microprocessor ry Schematic Diagram (Z09-A). - Figure -. UHF (-70 MHz) Audio ry Schematic Diagram (Z09-A) Figure -. UHF (-70 MHz) DC Regulation Schematic Diagram (Z09-A) Figure -. UHF (-70 MHz) Board Component Side View (Z09-A)... - Figure -. UHF (-70 MHz) Board Solder Side View (Z09-A)... - Figure -7. UHF (-70 MHz) Radio Block Diagram (Z-C) Figure -. UHF (-70 MHz) Receiver Front End Schematic Diagram (Z-C)... - Figure -9. UHF (-70 MHz) Receiver Back End Schematic Diagram (Z-C) Figure -0. UHF (-70 MHz) Synthesizer Schematic Diagram (Z-C) Figure -. UHF (-70 MHz) Voltage Controlled Oscillator Schematic Diagram (Z-C)... - Figure -. UHF (-70 MHz) Transmitter and Power Control Schematic Diagram (Z-C)... - Figure -. UHF (-70 MHz) Controller Interconnect Schematic Diagram (Z-C)... - Figure -. UHF (-70 MHz) Microprocessor ry Schematic Diagram (Z-C). - Figure -. UHF (-70 MHz) Audio ry Schematic Diagram (Z-C)... - Figure -. UHF (-70 MHz) DC Regulation Schematic Diagram (Z-C)... - Figure -7. UHF (-70 MHz) Board Component Side View (Z-C) Figure -. UHF (-70 MHz) Board Solder Side View (Z-C)... - Figure -9. UHF (-9 MHz) Radio Block Diagram (Z0-O)... - Figure -0. UHF (-9 MHz) Receiver Front End Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) Receiver Back End Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) Synthesizer Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) Voltage Controlled Oscillator Schematic Diagram (Z0-O) Figure -. UHF (-9 MHz) Transmitter and Power Control Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) Controller Interconnect Schematic Diagram (Z0-O) Figure -. UHF (-9 MHz) Microprocessor ry Schematic Diagram (Z0-O) -0 Figure -7. UHF (-9 MHz) Audio ry Schematic Diagram (Z0-O)... - Figure -. UHF (-9 MHz) DC Regulation Schematic Diagram (Z0-O)... - Figure -9. UHF (-9 MHz) Board Component Side View (Z0-O)... - Figure -0. UHF (-9 MHz) Board Solder Side View (Z0-O)... - June, N-C

13 Table of Contents xi List of Tables Table -. Recommended Test Equipment... - Table -. Service Aids... - Table -. Recommended Service Tools... - Table -. Voltage Regulators... - Table -. Radio Memory Requirements... - Table -. SPI Bus Signal Definitions... - Table -. Troubleshooting Table for Receiver... - Table -. Troubleshooting Table for Synthesizer... - Table -. Troubleshooting Table for Transmitter... - Table -. Troubleshooting Table for Board and IC Signals Table -. Troubleshooting Table for Receiver... - Table -. Troubleshooting Table for Synthesizer... - Table -. Troubleshooting Table for Transmitter... - Table -. Troubleshooting Table for Board and IC Signals... - Related Publications CP0/CP00 Basic Service Manual...009N CP0/CP00 User Guide...009N0 009N-C June, 00

14 xii Table of Contents June, N-C

15 Chapter Test Equipment, Service Aids, and Service Tools. Test Equipment Table - lists test equipment required to service the CP0/CP00 Radios. Table -. Recommended Test Equipment Motorola Part No. Description Characteristics Application R00 series System analyzer This item will substitute for items with an asterisk (*) *R07A Fluke 7 digital multimeter True RMS metering, 00 khz frequency counter, -segment bar graph with backlit display Frequency/deviation meter and signal generator for wide-range troubleshooting and alignment Digital voltmeter is recommended for AC/DC voltage and current measurements Fluke RF probe 00 MHz, 0 VAC max Use with Fluke 7 digital multimeter for RF voltage measurements. *R77A AC voltmeter mv to 00 mv, 0 megaohm input impedance Audio voltage measurements RA Dual channel 00 MHz oscilloscope (Agillent) Two-channel, 00 MHz bandwidth, 00 M sample rate/sec, MB memory/ channel S9A RF millivolt meter 00 µv to V RF, 0 khz to GHz frequency range *R0B or *R70A SINAD meter or SINAD meter with RMS Without RMS audio voltmeter or With RMS audio voltmeter Waveform measurements RF level measurements Receiver sensitivity measurements

16 - Test Equipment, Service Aids, and Service Tools: Service Aids. Service Aids Table - lists service aids recommended for working on the CP0/CP00 Radios. While all of these items are available from Motorola, most are standard shop equipment items, and any equivalent item capable of the same performance may be substituted for the item listed. Table -. Service Aids Motorola Part No. Description Application RLN0 Portable Test Set Enables connection to the audio/accessory jack. Allows switching for radio testing. RLN0 Battery Interface Regulates DC current and voltage between radio and power supply. RVN9 Customer Programming Software and Global Tuner Software on CD Rom Program customer option and channel data. AAPMKN00 Programming Test Cable Connects radio to RIB (PLN00). AAPMKN00 Radio-to-Radio Cloning Cable Allows a radio to be duplicated from a master radio by transferring programmed data from the master radio to the other. RLN00 Radio Interface Box Enables communications between the radio and the computer s serial communications adapter. Z0 RF Adaptor Adapts radio s antenna port to B cabling of test equipment. 000K0 Shop Battery Eliminator Interconnects radio to power supply. HSN9 Wall-Mounted Power Supply Used to supply power to the RIB (0 VAC). 009B7 or 009B7 Computer Interface Cable Use B7 for the IBM PC AT or newer (9-pin serial port). Use B7 for older models (-pin serial port). Connects the computer s serial communications adapter to the RIB (PLN00). Z0 Knob Remover/Chassis Opener Used to remove the front cover assembly. HKN9 IBM Computer Interface Cable Connection from computer to RIB. 0N Housing Eliminator Allows testing of the radio outside of the housing. Table -. Recommended Service Tools Motorola Part No. Description Application RSX0A TORX screwdriver Tighten and remove chassis screws 07A70 T TORX bit Removable TORX screwdriver bit RA Digital readout solder station Digitally controlled soldering iron RLN0A Hot air workstation, 0 V Tool for hot air soldering/desoldering of surface mounted integrated circuits June, N-C

17 Test Equipment, Service Aids, and Service Tools: Service Aids - Table -. Recommended Service Tools (Continued) Motorola Part No. Description Application 00A7 Illuminated magnifying glass with lens attachment Illumination and magnification of components 000E Master lens system 00A Anti-static grounding kit Used during all radio assembly and disassembly procedures C7 Straight prober 0A9 Brush 000A Solder (RMA type), /7, 0.mm diameter, lb. spool 000E SMD tool kit (included with R9A) R9A ChipMaster (0 V) Surface mount removal and assembly of surface RA ChipMaster (0 V) mounted integrated circuits and/or rework station shields. Includes nozzles. ChipMaster Nozzles: 0E PLCC-* nozzle 0E PLCC-* nozzle 0E9 PLCC- nozzle 0E9 PLCC- nozzle 0E7 QFP-0 nozzle 0E SOL- nozzle 0E SOIC-0 nozzle 0E7 SOL-0J nozzle 0E SOL- nozzle 0E TSOP- nozzle * Included with ChipMaster packages Soldering and Un-soldering IC s 009N-C June, 00

18 - Test Equipment, Service Aids, and Service Tools: Service Aids Programming/Test Cable POSITION MALE CONNECTOR POSITION FEMALE CONNECTOR P P.0 CABLE.0 CABLE P Figure -. Programming/Test Cable.mm mono.mm stereo P.mm stereo and.mm.mm Tip Orange (Speaker +).mm Sleeve.mm Tip (Microphone).mm.mm Center Blue White Spiral Yellow 7 ohm P pin Male D Connector Components molded inside K + UF,V % P pin Female D Connector To Test Box To Test Box Figure -. Wiring of the Connectors June, N-C

19 Chapter DC Power Distribution. DC Regulation and Distribution A block diagram of the DC power distribution throughout the radio is shown in Figure -. Audio Power Amplifier Accessories 0 pin Connector Keypad/Option Board UNSWB+ Vdda Regulator Vdda 7. Battery Fuse SWB+ Vddd Regulator Vddd.V Reg. LI Ion MECH. SWB+ PA, Driver PCIC(ALC) Low Battery Detect Control On/Off Switch Antenna Switch Tx Led MCU, ROM and EEPROM Regulator LCD Driver ASFIC_CMP RF AMP, IF AMP, RX/TX Buffers IFIC FRACTN VCOBIC Figure -. DC Power Distribution Block Diagram Battery voltage enters at connector J0 and is routed through fuse F0 to become USWB+. VR0 protects against ESD, and D0 provides reverse polarity protection. This voltage is routed to: FET switch Q70 in the TX power control circuit (turned on during transmit) TX power amplifier module U0 (via R0) input pins of regulators U0, U0 and U0 FET switch Q9 (turned on whenever the radio is on) on-off switch S (part of on-off-volume control) to become SWB+

20 - DC Power Distribution: DC Regulation and Distribution When the radio is turned on, SWB+ is present and is applied to: transistor switch Q9 (pins and ) which turns on Q9 RX audio power amplifier U90 voltage divider R0/R and port PE0, a microprocessor A/D input which measures battery voltage and radio on/off status The output of FET switch Q9 is applied to the control pins of regulators U0, U0 and U0, turning them on. The following regulators are used: Table -. Voltage Regulators Reference No. Description Type U0 V Regulator TK770S U0 Digital. V Regulator LP9 U0 V Regulator TK770S The V source is applied to: RX back end circuitry synthesizer super filter input and charge pump supply RED/GRN LEDs RX audio buffer U0 portions of ASFIC U The V source is also applied to FET switches Q and Q. Q is turned on by Q when RX_ENA (from U0 pin 9) is high, and supplies the "R" source to the RF front end stages Q- Q, and the VCO RX injection buffer Q0. Q is turned on by Q when TX_ENA (from U0 pin 0) is high, and supplies the "T" source to the first transmitter stage Q00. The digital. volt source from U0 (D_. V) is applied to: microprocessor U0 EEPROM U0 flash ROM U0 The V regulated source from U0 is applied to: synthesizer IC U0 VCO/buffer IC U portions of ASFIC U microphone bias circuitry While the radio is turned on, port PH (U0 pin ) is held high. When the radio is turned off, SWB+ is removed and port PE0 (U0 pin 7) goes low, initiating a power-down routine. Port PH (pin ) remains high, keeping the voltage regulators on via Q9 and Q9, until the operating state of the radio has been stored in EEPROM and other turn-off data functions have been completed. PH then goes low, turning off Q9 and Q9, and all regulated voltages are removed. June, N-C

21 Chapter Controller Theory of Operation. Controller The controller provides the following functions: interface with controls and indicators serial bus control of major radio circuit blocks encoding and/or decoding of selective signaling formats such as PL, DPL, MDC00 and Quik- Call II interface to CPS programming via the microphone connector storage of customer-specific information such as channel frequencies, scan lists, and signaling codes storage of factory tuning parameters such as transmitter power and deviation, receiver squelch sensitivity, and audio level adjustments power-up, power-down and reset routines Figure 7- (VHF) shows the interconnection between the controller and the various other radio blocks. Figure 7-9 show the connections between the following circuit areas which comprise the controller block: microprocessor circuitry audio circuitry DC regulation circuitry (refer to Chapter, DC Regulations and Distribution.) rotary and pushbutton controls and switches option board interface The majority of the circuitry described below is contained in the (VHF) Microprocessor ry schematic diagrams (Figure 7-0). Portions are also found in the Audio and DC Regulation schematics (Figures 7- and 7-)... Microprocessor ry The microprocessor circuitry includes microprocessor (U0) and associated EEPROM, S-RAM (not used in PR00 models), and Flash ROM memories. The following memory IC's are used: Table -. Radio Memory Requirements Reference No. Description Type Size U0 Serial EEPROM AT K x U0 Static RAM (not used) U0 Flash ROM AT9LV00N_70 V K x

22 - Controller Theory of Operation: Controller... Memory Usage Radio operation is controlled by software that is stored in external Flash ROM memory (U0). Radio parameters and customer specific information is stored in external EEPROM (U0). The operating status of the radio is maintained in RAM located within the microprocessor. When the radio is turned off, the operating status of the radio is written to EEPROM before operating voltage is removed from the microprocessor. See section...7 Microprocessor Power-Up, Power-Down and Reset Routine on page - for a discussion of the power-down routine. Parallel communication with U0 and U0 is via: address lines A(0)-A(), from U0 port F ADDR0-ADDR and port G XA-XA data lines D(0)-D(7), from U0 port C DATA0-DATA7 chip-select for U0, from PH (U0 pin ) chip-enable for U0, from PH7 (U0 pin ) output enable for U0, from PA7 (U0 pin ) write-enable for both U0 and U0, from PG7_R/W (U0 pin ) Serial communication with U0 is via: the SPI bus (see section... Serial Bus Control of Blocks on page -) chip-select for U0, from PD (U0 pin )... Control and Indicator Interface Ports PI and PI are outputs which control the top-mounted LED indicator. When PI is high, the indicator is red. When PI is high, the indicator is green. When both are high, the indicator is amber. When both are low, the indicator is off. Pressing the side-mounted PTT button (S) provides a low to port PJ0 (U0 pin 7), which indicates PTT is asserted. Side-mounted option buttons and (S and S) are connected to Ports PJ (pin 77) and PJ7 (pin 7), respectively.... Serial Bus Control of Blocks The microprocessor communicates with other circuit blocks via a SPI (serial peripheral interface) bus using ports PD (data into up), PD (data out of up) and PD (clock). The signal names and microprocessor ports are defined in Table -. Table -. SPI Bus Signal Definitions Signal Name Microprocessor Port Microprocessor Pin SPI-DATA_IN PD-MISO U0 Pin 99 SPI_DATA_OUT PD-MOSI U0 pin 00 SPI_CLK PD-SCK U0 pin These signals are routed to: the audio filter IC (U) to control internal functions such as gain change between khz and. khz channels, transmit or receive mode, volume adjustment, etc. the synthesizer IC U0 to load receive and transmit channel frequencies option board connector J0- for internal option configuration and control serial EEPROM U0 (both SPI_DATA_IN and SPI_DATA_OUT are used). June, N-C

23 Controller Theory of Operation: Controller - In order for each circuit block to respond only to the data intended for it, each peripheral has its own chip select (or chip enable) line. The device will only respond to data when its enable line is pulled low by one of the microprocessor ports, as follows: port PD (U0 pin ) for the audio filter IC port PH0 (U0 pin 7) for the synthesizer IC port PD (U0 pin ) for the serial EEPROM.... Interface to RSS Programming The radio can be programmed, or the programmed information can be read, using a computer with CPS (Customer Programming Software) connected to the radio via a RIB (radio interface box) or with the RIB-less cable. Connection to the radio is made via the microphone connector (part of accessory connector J7). The SCI line connects the programming contact (J7 pin ) to ports PD0_RXD (data into up, pin 97) and PD_TXD (data out of up, pin 9). Transistor Q0 isolates the input and output functions by allowing PD to pull the line low, but does not affect incoming data from being read by port PD0. This isolation allows high-speed -wire programming via TP0 and TP0 for factory programming and tuning.... Storage of Customer-Specific Information Information that has been programmed using CPS, such as channel frequencies or selective signaling codes, are stored in the external EEPROM, where it is retained permanently (unless reprogrammed) without needing DC power applied to the microprocessor.... Sensing of Externally-Connected Accessories Port PJ is used to detect the presence of externally connected accessories. Port PJ (U0 pin 7) is normally low, unless accessories (lapel speaker microphone, lightweight headset, etc.) are used with the radio. This port is used to detect an accessory PTT or auto sensing of a VOX accessory. If VOX is programmed into the radio channel codeplug information, and PJ is high during power-up, the radio will activate VOX operation. If a low is present at port PJ during power-up, the radio will use this port as an external PTT indicator....7 Microprocessor Power-Up, Power-Down and Reset Routine On power-up, the microprocessor is held in reset until the digital. V regulator (U0 pin ) provides a stable supply voltage. Once the digital supply reaches steady state and releases the reset line (U0 pin 7), the microprocessor begins to start up. The ASFIC_CMP (U) has already started running and is providing the startup clock to the microprocessor. After reset release by all circuits, the software within the microprocessor begins executing port assignments, RAM checking, and initialization. A fixed delay of 00 ms is added to allow the audio circuitry to settle. Next, an alert beep is generated and the steady state software begins to execute (buttons are read, radio circuits are controlled). When the radio is turned off, SWB+ is removed and port PE0 (U0 pin 7) goes low, initiating a power-down routine. Port PH (pin ) remains high, keeping the voltage regulators on via Q9 and Q9, until the operating state of the radio has been stored in EEPROM. PH then goes low, and all regulated voltages are removed. 009N-C June, 00

24 - Controller Theory of Operation: Controller The microprocessor reset line (pin 9) can be controlled directly by the digital. V regulator (U0 pin 7), the microphone jack (part of accessory connector J7) via Q7 and Q7, and the microprocessor itself. U0 pulls the reset line low if the digital. V source loses regulation. This prevents possible MOS latch-up or overwriting of registers in the microprocessor because the reset line is higher in voltage than the microprocessor VDD ports (U0 pins, 9, 9, ). The microprocessor can drive the reset line low if it detects a fault condition such as an expired watchdog timer, software attempting to execute an infinite loop, unplanned hardware inputs, static discharge, etc. Finally, the Q7 can pull the reset line low during use of the programming cable and CPS by the application of a sufficiently negative voltage to the microphone connector tip contact (J7 pin ), however this reset method is not utilized.... Boot Mode Control When power-up reset occurs, the microprocessor will boot into either normal or flash mode depending on the logic level of ports MODA (U0 pin ) and MODB (pin 7). The Flash Adapter is a programming accessory which provides negative 9 volts dc via a K resistor to microphone connector J7 pin. This turns on Q7 and Q7 via D7 and VR7, pulling MODA and MODB low and allowing booting in the flash mode by cycling power to reset the radio. Software upgrades can then performed by loading the new software code into Flash ROM U Microprocessor 7.97 MHz Clock The 7.97 MHz clock signal (up_clk) is provided from the ASFIC_CMP (U pin ). Upon startup the.mhz crystal provides the signal to the ASFIC_CMP, which sends out the up_clk at.mhz until a steady-state condition is reached and the clock is increased to 7.97MHz for the microprocessor....0 Battery Gauge Various battery types are available having different capacities. The different battery types contain internal resistors connected from the BATT_CHARGE contact to ground (which is routed to the microprocessor as BATT_DETECT). A voltage divider is formed with R producing a different DC voltage for each battery type, which is read by microprocessor port PE (pin ). This allows the software to recognize the battery chemistry being used and adjust the battery gauge for best accuracy... Audio ry... Transmit and Receive Low-Level Audio ry The majority of RX and TX audio processing is performed by U, the Audio Filter IC (ASFIC_CMP), which provides the following functions: Tone PL/Digital PL encode and decode filtering Tone PL/Digital PL rejection filter in RX audio path TX pre-emphasis amplifier TX audio modulation limiter Post-limiter (splatter) filter TX deviation adjust (digitally-controlled attenuators) Programmable microphone gain attenuator RX audio volume control (digitally controlled attenuator) Carrier squelch adjustment (digitally controlled attenuator) Microprocessor output port expansion June, N-C

25 Controller Theory of Operation: Controller -. volt dc reference source Microprocessor clock generation (from the. MHz reference oscillator input) The parameters of U that are programmable are selected by the microprocessor via the CLOCK (U pin ), DATA (U pin ) and chip enable (U pin 0) lines. RX audio buffer U0 amplifies the audio level from the DEMOD output of the IFIC before being applied to the audio filter IC input (DISC, U pin ). The buffer is DC coupled to avoid corruption of low-frequency data waveforms such as DPL. Because such waveforms are polarity sensitive, this buffer is configured as a single-stage inverting amplifier (U0- only) for VHF models where highside first injection is used, or is configured as a two-stage non-inverting amplifier (U0- and -) for UHF models using low-side first injection. The gain of the buffer is. times or. db. U0 and associated components are not used. Stage U0- is bypassed by jumper R7. Volume adjustment is performed by a digital attenuator within U. The volume control (0KO, part of S) is connected to D_. V and ground via R0 and R07. When the volume control is rotated, it varies the dc voltage applied to microprocessor A/D input port PE (U0 pin ) between approximately 0 volts dc at minimum volume to. volts dc at maximum volume. Depending on this voltage, the appropriate setting of the digital volume attenuator is selected. This technique is less susceptible to noise than a conventional analog volume control.... Audio Power Amplifier The audio power amplifier IC U90 amplifies receiver audio from U pin to a level sufficient to drive a loudspeaker. U90 is a bridge amplifier delivering. volts rms between pins and without distortion, which is sufficient to develop 00 milliwatts of audio power into the internal ohm speaker or an external ohm load. The audio power amplifier is muted whenever speaker audio is not required to reduce current drain. The audio amp is muted when U pin is low. When U pin is high, U90 pin is pulled low by Q90, enabling the audio amplifier. Because the power amplifier is a bridge-type, neither speaker terminal is grounded. Care should be taken that any test equipment used to measure the speaker audio voltage does not ground either speaker output terminal, otherwise damage to the audio power amplifier IC may result. When a - ohm load resistor is used it should be connected between the tip and the sleeve of accessory jack J7 (.mm port), never to ground. External SPKR plug insertion mechanically disconnects the internal speaker. Voltage measurements using test equipment that is not isolated from ground may be made from one side of the speaker or load resistor (either the tip or the sleeve of J7) to chassis ground, in which case the voltage indicated will be one half of the voltage applied to the speaker or load resistor. The Motorola RLN0 Portable Test Set and AAPMKN00 Programming Test Cable provide the proper interface between the radio's ungrounded audio output and ground-referenced test equipment.... Internal Microphone Audio Voice Path Microphone audio from internal microphone is routed from J70- via C7, L7, and C70 to the ASFIC_CMP mic audio input (MICINT, U pin ). During transmit, Q70 is turned on by a low at U pin, providing dc bias for the internal MIC via R7. External MIC plug insertion mechanically disconnects the internal microphone. External MIC audio is coupled through L7 and C70 to the mic audio input. An input level of 0 mv at J7 pin produces 00 mv at the output of U pin 0, which corresponds to 0% deviation. 009N-C June, 00

26 - Controller Theory of Operation: Controller... PTT s The internal side-mounted PTT switch (S) is sensed directly by microprocessor port PJ0 (U0 pin 7). External mic PTT is sensed by measuring the current drawn through the accessory connector (J7-) by the mic cartridge (which is in series with the accessory PTT switch). This current is drawn through the base (pin ) and emitter (pin ) of a transistor in Q70, causing its collector (pin ) to supply a logic-high to microprocessor port PJ (pin 7).... VOX Operation VOX audio accessories do not have a PTT switch. Instead, the mic cartridge is wired directly from J7- to ground. If the radio has been programmed for VOX operation and the VOX accessory is plugged in prior to turning the radio on, the current drawn by the cartridge will turn on Q70 (pins - -) and a logic high will be seen at port PJ at turn-on. The microprocessor then assumes VOX operation, with PTT controlled by the presence of audio at the mic cartridge. A dc voltage proportional to the audio level at the input of the ASFIC_CMP (U pin ) is fed to an A/D input of microprocessor U0 (pin ). During VOX operation, PTT is activated when the dc level exceeds a preset threshold.... Battery Charging Through Microphone Jack A wall-type charging power supply may be connected to the. mm microphone jack (part of accessory connector J). The voltage present at the tip contact (pin ) is applied to the center charging contact of the battery via diode D70. Another diode, internal to the battery, applies this voltage to the (+) battery terminal. Only the recommended charger and battery type should be charged in this manner. Different battery types contain internal resistors connected from the BATT_CHARGE contact to ground, which is routed to the microprocessor as BATT_DETECT. A voltage divider is formed with R producing a DC voltage which is read by microprocessor port PE (pin ). This allows the software to recognize the battery chemistry being used and adjust the battery gauge for best accuracy. The value of R is chosen so that the voltage at the BATT_CHARGE node (cathode of D70) is never low enough to turn on the EXT_MIC_PTT sense transistor (part of Q70)....7 Programming and Flashing Through Microphone Jack The ring contact on the. mm microphone jack is used for reading, programming or re-flashing the radio using CPS. This contact (J7 pin ) is routed to ports PD0_RXD (data into up, pin 97) and PD_TXD (data out of up, pin 9). Transistor Q0 isolates the input and output functions by allowing PD to pull the line low, but does not affect incoming data from being read by port PD0. To re-flash the radio (overwrite the software in the Flash ROM with new software), the radio must power up in the boot mode. This is accomplished by using a flash adapter accessory, which provides SCI communication with the programming ring contact (J7 pin ) and also allows a negative voltage (negative 9 volts dc via a K resistor) to be applied to the tip contact (J7 pin ). This voltage is sufficient to turn on the base-emitter junction (pins and ) of Q7 via L7, D7, VR7 and R7. Pin of Q7 goes high, turning on Q7 (pins and ) and pulling the BOOT_ENA line (ports MODA and MODB of the microprocessor) low. Cycling power generates a reset which causes the radio to boot in the flash mode. June, N-C