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Table of Contents

Chapter 1 THEORY OF OPERATION

1.0 Overview..............................................................................................................1-1

2.0 Radio Power Distribution .....................................................................................1-1

3.0 Controller Circuits ................................................................................................1-2

3.1 Controller Architecture....................................................................................1-2

3.2 MCU Digital Architecture ................................................................................1-2

3.3 Real Time Clock.............................................................................................1-3

3.4 ModB/Vstby Supply ........................................................................................1-4

3.5 Audio/Signaling Architecture ..........................................................................1-4

Chapter 2 TROUBLESHOOTING CHARTS

1.0 UHF/ UHF2 Controller..........................................................................................2-1

1.1 All models except those with PCB 8486458Z03.............................................2-1

1.2 Models with PCB 8486458Z03.......................................................................2-2

Chapter 3 CONTROLLER SCHEMATICS

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

2.0 Controller - Set 1 (PCB 8480450Z03, 8485641Z02, 8480587Z01/Z03,

8485677Z01/Z02, 8480641Z03/Z09/Z10)............................................................3-5

3.0 Controller - Set 2 (PCB 8480450Z13/14, 8480587Z05, 8415234H01/H02/H05,

8415235H01/H03, 8485641Z06) .......................................................................3-13

4.0 Controller - Set 3 (PCB 8486458Z03, 8486686Z02)..........................................3-20

5.0 Controller - Set 4 (PCB 8416256H02) ...............................................................3-25

6.0 Controller - Set 5 (PCB 8486743Z02)................................................................3-31

Motorola GP series Detailed Service Manual

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