Table of Contents-continued

*TM-11-5821-28434

Paragraph

Page

CHAPTER

DIRECT SUPPORT MAINTENANCE

Section

General

Scope of Direct Support Maintenance ..................................................

3-1

Tools, Test Equipment and Materials Required ...................................

3-2

3-1

II.

Direct Support Troubleshooting

Troubleshooting Procedure ..................................................................

3-3

3-1

General Precautions .............................................................................

3-4

3-2

Antenna Troubleshooting .....................................................................

3-5

3-2

III.

Direct Support Repair and Replacement

General.................................................................................................

3-6

Separation of Radome Assembly A2 and Coupler Assembly Al ..........

3-7

Reassembly of Coupler Assembly Al and Radome Assembly A2 ........

3-8

3-3

IV.

Direct Support Testing Procedures

General.................................................................................................

3-9

3-3

Special Requirements ..........................................................................

3-10

3-3

Physical Tests and Inspection ..............................................................

3-11

3-3

Antenna VSWR Test ............................................................................

3-12

3-3

Manual Cycle and Run Signal Test ......................................................

3-13

3-4

CHAPTER

GENERAL SUPPORT MAINTENANCE

Section

General

Scope of General Support Maintenance ..............................................

4-1

Test Equipment and Addition Equipment Required ..............................

4-2

4-1

General Precautions .............................................................................

4-3

4-1

Troubleshooting Procedures ................................................................

4-4

4-1

Troubleshooting Chart ..........................................................................

4-5

4-2

Section

II.

General Support Repair and Replacement

General.................................................................................................

4-6

Disassembly of Coupler Assembly .......................................................

4-7

4-6

Assembly of Coupler Assembly ............................................................

4-8

CHAPTER

PERFORMANCE STANDARDS

Applicability of Performance Standards ...............................................

5-1

Applicable References .........................................................................

5-2

5-1

Test Facilities Required ........................................................................

5-3

5-1

Phase Discriminator Outp ut Test..........................................................

5-4

5-1

Servo Loop Test ...................................................................................

5-5

5-2

Fine Tune Mode Test ...........................................................................

5-6

5-2

Servo Gain Test....................................................................................

5-7

5-3

Receive/Transmit Logic Test ................................................................

5-8

5-3

Homing Circuit Test ..............................................................................

5-9

5-4

Power Supply Test ...............................................................................

5-10

5-4

Pulsing Circuit Test ..............................................................................

5-11

5-5

Sequencing circuit Test ........................................................................

5-12

5-5

Manual Override Circuit Test ................................................................

5-13

5-7

CHAPTER 6

FINAL ILLUSTRATIONS ......................................................................

6-1

APPENDIX A

REFERENCES .....................................................................................

A-1

List of Illustrations

Title

Page

Figure

2-1

Antenna AS/2285/ARC, vhf/fm blade type, functional block diagram

2-3

2-2

Phase discriminator, simplified schematic diagram ..........................................................

2-4

2-3

Phase discriminator, vector analysis diagram ...................................................................

2-4

Operational amplifier, simplified schematic diagram .........................................................

2-5

Servo rotation logic, simplified schematic diagram ...........................................................

2-5

2-6

Sequential pulsing logic simplified schematic diagram .....................................................

2-7

Servo motor sequencing logic, simplified schematic diagram ..........................................

2-7

2-8

Servo motor and motor control logic, simplified schematic diagram .................................

2-10

logic, simplified schematic diagram ..................................................................................

2-11

2-9

Transmit/receive logic, homing log ic, and manual override

3-1

Test connections, antenna VSWR test .............................................................................

3-5

3-2

Test connections, manual cycle and run signal test ..........................................................

3-5

4-1

Gear train assembly A3, exploded view

5-1

Test connections, phase discriminator output test ............................................................

5-3

5-2

Test connections, servo loop test ......................................................................................

5-4