Service Manual

MM-E 2072-09333-00
iii
TABLE OF CONTENTS
Page
Chapter 1 INTRODUCTION
1-1. SCOPE .......................................................................................................................... 1-1
Chapter 2 THEORY OF OPERATION
Section I. GENERAL DESCRIPTION............................................................................................ 2-1
2-1. MICOM-Z DESCRIPTION ............................................................................................. 2-1
2-1.1 Micom-Z Dash-Mount Version ................................................................................... 2-1
2-1.2 Micom-Z Trunk-Mount Version .................................................................................. 2-9
2-1.3 Micom-Z Cooling Tray ............................................................................................. 2-15
2-2. OPTIONS AND ACCESSORIES................................................................................. 2-16
2-3. CONNECTOR DATA................................................................................................... 2-17
2-3.1 Micom-Z Connector Data......................................................................................... 2-17
2-3.2 Cooling Tray Connectors ......................................................................................... 2-19
Section II. CIRCUIT ANALYSIS ................................................................................................... 2-21
2-4. LORD MODULE .......................................................................................................... 2-21
2-4.1 Audio Subsystem..................................................................................................... 2-21
2-4.2 DSP Subsystem....................................................................................................... 2-21
2-4.3 ISB Option ............................................................................................................... 2-22
2-4.4 IF and RF Transmit Path ......................................................................................... 2-22
2-4.5 RF Front End ........................................................................................................... 2-25
2-4.6 Receive IF Path ....................................................................................................... 2-26
2-4.7 Synthesizer Subsystem ........................................................................................... 2-26
2-4.8 Main Microcomputer Subsystem ............................................................................. 2-29
2-4.9 Power Supply Subsystem........................................................................................ 2-30
2-4.10 LORD Module Test Point Data ................................................................................ 2-31
2-5. HI POWER MODULE.................................................................................................. 2-33
2-5.1 Power Amplifier (PA) ............................................................................................... 2-33
2-5.2 TX/RX Switch........................................................................................................... 2-33
2-5.3 Harmonic Filter Bank ............................................................................................... 2-33
2-5.4 Power Sensor .......................................................................................................... 2-34
2-5.5 ALC Circuits............................................................................................................. 2-34
2-5.6 Power Supply Subsystem........................................................................................ 2-37
2-6. CONTROL HEAD MODULE........................................................................................ 2-38
2-6.1 CONTROL HEAD Module for Dash-Mount Version................................................. 2-38
2-6.2 CONTROL HEAD Module for Trunk-Mount Version ................................................ 2-40
2-7. INTERCONNECTION MODULE ................................................................................. 2-42
2-8. FAN CONTROL MODULE .......................................................................................... 2-42
Chapter 3 MAINTENANCE
3-1. SCOPE .......................................................................................................................... 3-1
3-2. HANDLING PRECAUTIONS DURING MAINTENANCE .............................................. 3-1
3-3. CLEANING .................................................................................................................... 3-3
3-4. TESTING ....................................................................................................................... 3-3
3-4.1 Micom-Z Testing ........................................................................................................ 3-3
3-4.2 Module Testing and Alignment .................................................................................. 3-3
3-5. TROUBLESHOOTING .................................................................................................. 3-4
3-5.1 Overview of Troubleshooting Procedures.................................................................. 3-4
3-5.2 BIT Error Codes......................................................................................................... 3-4
3-5.3 Troubleshooting Procedure ....................................................................................... 3-6
3-5.4 Micom-Z Troubleshooting Charts .............................................................................. 3-9
3-5.5 Module Troubleshooting Procedures....................................................................... 3-16
3-6. MICOM-Z REPAIR PROCEDURES ............................................................................ 3-21
3-6.1 Micom-Z Dash-Mount Version Repair ..................................................................... 3-21
3-6.2 Repair of Micom-Z Trunk-Mount Version................................................................. 3-27
Appendix A SCHEMATIC CIRCUIT DIAGRAMS
Appendix B PARTS LISTS
Section I. MICOM-Z DASH-MOUNT VERSION ............................................................................B-1
Section II. MICOM-Z TRUNK-MOUNT VERSION........................................................................B-93
Section III. COOLING TRAY .......................................................................................................B-119