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Section 3: i

6881091C63-F

Section 3: Controller Service Maintainability

Table of Contents

Chapter 1 Theory of Operation

1.0 Controller Circuits .............................................................................................3:1-1

1.1 Overview......................................................................................................3:1-1

1.2 General........................................................................................................3:1-1

1.3 Radio Power Distribution.............................................................................3:1-2

1.4 Electronic ON/OFF ......................................................................................3:1-4

1.5 Emergency ..................................................................................................3:1-4

1.6 Mechanical ON/OFF....................................................................................3:1-5

1.7 Ignition.........................................................................................................3:1-5

1.8 Microprocessor Clock Synthesizer ..............................................................3:1-5

1.9 Serial Peripheral Interface (SPI)..................................................................3:1-6

1.10 SBEP Serial Interface..................................................................................3:1-7

1.11 General Purpose Input/Output.....................................................................3:1-7

1.12 Normal Microprocessor Operation...............................................................3:1-8

1.13 FLASH Electronically Erasable Programmable Memory (FLASH EEPROM)3:1-

1.14 Electrically Erasable Programmable Memory (EEPROM)...........................3:1-9

1.15 Static Random Access Memory (SRAM)...................................................3:1-10

2.0 Controller Board Audio and Signaling Circuits................................................3:1-10

2.1 Audio Signaling Filter IC with Compander (ASFIC CMP)..........................3:1-10

2.2 Transmit Audio Circuits .............................................................................3:1-11

2.3 Transmit Signaling Circuits........................................................................3:1-13

2.4 Receive Audio Circuits ..............................................................................3:1-15

2.5 Receive Signaling Circuits.........................................................................3:1-18

2.6 Voice Storage (Optional) ...........................................................................3:1-19

Chapter 2 Troubleshooting Charts

1.0 Troubleshooting Flow Chart for Controller........................................................3:2-1

Chapter 3 Controller Schematics and Parts Lists

1.0 Allocation of Schematics and Circuit Boards ....................................................3:3-1

1.1 Controller Circuits........................................................................................3:3-1

1.2 Voice Storage Facility..................................................................................3:3-1

2.0 Controller T2 Schematics and Parts Lists.........................................................3:3-5

3.0 Controller T5 Schematics and Parts Lists.......................................................3:3-12

4.0 Controller T6/T7/T9 Schematics and Parts Lists ............................................3:3-20

Motorola CDM1250 Service Manual

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