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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,
8485677Z01, 8480641Z03) ......................................................3-3
3.0 Controller - Set 2 (PCB 8480450Z13/14, 8485641Z06).......................................3-9
4.0 Controller - Set 3 (PCB 8486458Z03, 8486686Z02)..........................................3-15
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