TM-11-5805-387-34-2

• Technical Manual
• Safety Steps to Follow if Someone is The Victim of Electrical Shock
• Warning
• Warning (cont)
• Table of Contents
• MODEM, RADIO TELETYPEWRITER MD-522A/GRC
• CHAPTER 1. INDEX
• STAGE ANALYSIS, TRANSMIT SIGNAL PATHS
• Chapter 1. INTRODUCTION
• Section II. EQUIPMENT DESCRIPTION AND DATA
• Section III. TECHNICAL PRINCIPLES OF OPERATION
• TRANSMIT SIGNAL PATH
• TRANSMIT SIGNAL PATH SIMPLIFIED BLOCK DIAGRAM
• RECEIVE SIGNAL PATH SIMPLIFIED BLOCK DIAGRAM
• POWER SUPPLY
• POWER SUPPLY SIMPLIFIED BLOCK DIAGRAM
• Section IV. DETAILED BLOCK DIAGRAM ANALYSIS OF TRANSMIT SIGNAL PATHS
• MARK-SPACE TONE GENERATION
• TRANSMITTER MODULE A3, 2,805-HZ NSK GENERATION
• MIXER CIRCUIT
• TRANSMIT VOICE SIGNAL PATH
• TRANSMIT OUTPUT CIRCUITRY
• TRANSMITTER FREQUENCIES
• Section V. DETAILED BLOCK DIAGRAM ANALYSIS OF RECEIVE SIGNAL PATHS
• RECEIVE TTY CHANNEL 2
• RECEIVE MARK-SPACE PULSE GENERATION
• RECEIVE DC LOOP
• DIVERSITY SWITCHING
• VOICE AND TTY MONITOR SIGNAL PATH
• Section VI. STAGE ANALYSIS, TRANSMIT SIGNAL PATHS
• LOOP BATTERY MODULE DC TO AC INVERTER
• DC-TO-AC INVERTER AND CURRENT REGULATOR
• LOOP BATTERY MODULE CURRENT REGULATOR
• LOOP BATTERY MODULE RECEIVE SENSING
• LOOP BATTERY MODULE SEND SENSING
• SWITCHING CIRCUITS
• LOOP CURRENT PATHS
• TRANSMITTER MODULE A3
• MARK AND SPACE OSCILLATOR OUTPUT SWITCHING
• DIVIDE-BY-10 WAVEFORMS, TRANSMITTER MODULE A3
• MIXER OSCILLATOR AND SWITCHING
• MIXER OSCILLATOR OUTPUT DIVIDER CIRCUITS
• TRANSMITTER MODULE MIXER CIRCUIT, SINE WAVE PASS FILTER AND ISOLATION AMPLIFIER
• MIXER AMPLIFIER AND TRANSMIT FSK/NSK FILTER SWITCHING
• TRANSMIT VOICE CIRCUITS
• Section VII. STAGE ANALYSIS, RECEIVE SIGNAL PATHS
• RECEIVE AUDIO MODULE A1
• RECEIVER MODULE A4
• RECEIVER MODULE MIXER, MIXER INJECTION AMPLIFIER AND NSK, FSK FILTER SWITCHING
• FREQUENCY DISCRIMINATOR CIRCUITS
• FREQUENCY DISCRIMINATOR AND SWITCHING, RECEIVER MODULE A4
• RECEIVE MARK-SPACE PULSE GENERATION, STAGE ANALYSIS
• RECEIVER MODULE A4, OUTPUT STAGES
• DIVERSITY SWITCHING
• DIVERSITY SWITCHING, RECEIVER MODULE A4
• MARK HOLD SWITCHING
• MARK HOLD SWITCHING, RECEIVER MODULE A4
• SCOPE MODULE A2
• INTENSITY SQUELCHING
• Section VIII. POWER SUPPLY STAGE ANALYSIS AND SWITCHING
• +22-VOLT PREREGULATOR
• OPERATIONAL CONTROL CIRCUITS
• 85-HZ OPERATION
• 85-HZ DIVERSITY OPERATION
• Section IX. METERING STAGE ANALYSIS AND SWITCHING
• TEST METER, SWITCHING
• CHAPTER 2. Index
• Chapter 2. DIRECT SUPPORT MAINTENANCE
• MATERIALS
• OPTIONAL MATERIALS
• Section II. TROUBLESHOOTING
• MODEM BENCH TEST SETUP AND TEST CONDITIONS
• TEST EQUIPMENT
• TROUBLESHOOTING SYMPTOM INDEX
• TROUBLESHOOTING CHART
• NO TEST METER OR SCOPE READINGS FOR ANY POSITION OF METER FUNCTION SWITCH.
• NO TEST METER OR SCOPE READINGS FOR ANY POSITION OF METER FUNCTION SWITCH. (Cont)
• NO + 20 VOLTS DC METER INDICATION
• METER FUNCTION SWITCH AT REGULATED DC: LOW OR HIGH READING ON TEST METER
• MODEM NOT TRANSMITTING EITHER VOICE OR TTY.
• MODEM NOT TRANSMITTING TTY.
• MODEM NOT TRANSMITTING VOICE.
• NO RCV LEVEL READING ON METER M1. RECEIVE CHANNEL MALFUNCTIONING
• RECEIVE TTY MALFUNCTION
• NO CURRENT IN RECEIVE DC LOOP MODEM IN MARK-HOLD CONDITION.
• TUNING MALFUNCTION IN 850 HZ MODE
• 20-MA LOOP CURRENT, BUT NO 60- MA LOOP CURRENT.
• LOSS OF DC LOOP CURRENT REGULATION
• ABNORMAL SCOPE PRESENTATION BUT NORMAL DISCRIMINATOR INDICATION ON TEST METER.
• ABNORMAL SCOPE PRESENTATION BUT NORMAL DISCRIMINATOR INDICATION ON TEST METER. (Cont)
• TEST POINT MEASUREMENTS
• TEST POINT CHART 1
• TEST POINT CHART 1 (CONT)
• Section III. MAINTENANCE PROCEDURES
• REMOVING AND REPLACING FRONT PANEL ASSEMBLY
• REMOVING AND REPLACING PRINTED CIRCUIT BOARDS A6, A7, A8, A9
• REMOVING AND REPLACING CONNECTORS AND CHASSIS COMPONENTS
• REMOVING AND REPLACING CONNECTORS AND CHASSIS COMPONENTS (Cont)
• REMOVING AND REPLACING CONNECTORS AND CHASSIS COMPONENTS (Cont)
• Section IV. ADJUSTMENT PROCEDURES
• REGULATED VOLTAGE ADJUSTMENT
• LOOP CURRENT ADJUSTMENT
• LOOP CURRENT ADJUSTMENT (cont)
• BFO FREQUENCY LIMITS ADJUSTMENT
• SCOPE MODULE A2 CENTERING ADJUSTMENT
• SCOPE MODULE A2 ALIGNMENT
• SCOPE MODULE A2 ALIGNMENT (Cont)
• SCOPE MODULE A2 ALIGNMENT (Cont)
• CHAPTER 3. Index
• Chapter 3. GENERAL SUPPORT MAINTENANCE
• MODEM BENCH TEST SETUP AND TEST CONDITIONS
• TROUBLESHOOTING CHART
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TROUBLESHOOTING CHART (Cont)
• TEST POINT MEASUREMENTS
• TEST POINT CHART 2
• TEST POINT CHART 3
• Section III. MAINTENANCE PROCEDURES
• Section III. MAINTENANCE PROCEDURES (Cont)
• REMOVING AND REPLACING CHASSIS COMPONENTS
• ADJUSTMENT PROCEDURES
• Appendix A: REFERENCES
• Appendix A: REFERENCES (Cont)
• Appendix A: REFERENCES (Cont)
• INDEX
• INDEX (cont)
• INDEX (cont)
• INDEX (cont)
• FOLDOUT INDEX
• The Metric System and Equivalents
• Figure F0-1 Color Code Marking for Military Standard Resistors and Inductors, Sheet 1 of 2
• Figure F0-1 Color Code Marking for Military Standard Resistors and Inductors, Sheet 2 of 2
• Figure F0-2. Connection of Modem, Radio Teletypewriter MD-522A/GRC to Typical Equipment
• Figure F0-3. Receiver Signal Path, Simplified Block Diagram
• Figure F0-4. Transmit Signal Path, Detailed Block Diagram
• Figure F0-5. Receive Signal Path, Detailed Block Diagram
• Figure F0-6. Receive Signal Path (Continued), Block Diagram
• Figure F0-7. Scope A2 Module, Block Diagram
• Figure FO-8. MD-522A/GRC Main Chassis, Overall Schematic Diagram.
• Figure FO-9. Loop Battery A5 Module, Schematic Diagram.
• Figure FO-10. Transmitter A3 Module, Schematic Diagram.
• Figure FO-11. Transmit Voice Circuits, Simplified Schematic Diagram.
• Figure FO-12. Receive Audio A1 Module, Schematic Diagram.
• Figure FO-13. Receive A4 Module, Schematic Diagram.
• Figure FO-14. Scope A2 Module, Schematic Diagram.
• Figure FO-15. Main Power Supply, Control and Protective Circuits, Simplified Schematic Diagram.
• Recommended Changes to Equipment Technical Publications
• TM-11-5805-387-34-2
• By Order of the Secretary of the Army:
• Blank Page

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