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• Modem Low Speed Wire Line MD-674(P)/G
• WARNING
• Table of Contents
• Table of Contents cont'd
• LIST OF ILLUSTRATIONS
• LIST OF ILLUSTRATIONS cont'd
• FOLD-IN ILLUSTRATIONS
• Title
• Figure 1-1. Modem, Low Speed Wire Line MD-474(P)/G.
• Chapter 1 INTRODUCTION
• Section II. DESCRIPTION AND DATA
• Audiofrequency (cps)
• Description
• Figure 1-2. Modem, Low Speed Wire Line MD-674(P)/G, Modem Subassembly MX-73(*)/G, and Clock Module Group OA-8072/G
• Figure 1-3. Running spares.
• Figure 1-5. Modem, Low Speed Wire Line MD-674(P)/G, removed from case, top view, less Modem Subassembly MX-73(*)/G Clock Module Group OA-8072/G
• Figure 1-6. Modem, Low Speed Wire Line MD-74(P)/G removed from case
• Figure 1-7. Modem , Low Speed Wire Line MD-674(P)/G removed from case, bottom view.
• Figure 1-8. Modem, Low Speed Wire Line MD-674(P)/G, rear view, less access cover.
• Figure 1-9. Single-channel, secure, terminal facilities, block diagram
• Figure 1-10. Multiplex terminal facilities, block diagram
• Figure 1-11. Signal-channel repeater facility, block diagram
• CHAPTER 2 INSTALLATION
• Figure 2-1. Typical packaging diagram
• Strapping Options
• Figure 2-3. Control shelf, controls and test jacks
• Connections
• Figure 2-5. Printed-circuit card assembly strap terminal locations
• Remote
• Section III. INITIAL ADJUSTMENTS
• Loop-Back Adjustments
• System Adjustments
• Figure 2-7. Plug-in module of Modem Subassembly MX-7373/G, MX-7375/G, MX-7383/G, or MX-7385/G.
• Figure 2-8. Plug-in module of Modem Subassembly MX-7379/G.
• Equipment Alteration
• CHAPTER 3 OPERATION AND OPERATOR'S MAINTENANCE
• Operation Under Unusual Conditions
• CHAPTER 4 ORGANIZATIONAL MAINTENANCE
• Organizational Preventive Maintenance Checks and Services Chart
• Section II. TROUBLESHOOTING AND REPAIR
• Troubleshooting Chart. cont'd
• Replacement of Parts
• Replacement of Parts cont'd
• Chapter 4 FUNCTIONING OF EQUIPMENT
• Timing Circuits
• Order-Wire Circuits
• Bistable Multivibrator Stages
• Figure 5-1. Common input bistable stages, schematic diagram and logic symbol.
• Figure 5-2. Two-input bistable stages schematic diagram and logic
• Figure 5-4. Two-input bistable stage, +6-volt clamped output, schematic diagram and logic symbol
• Figure 5-5. AND gate stages, schematic diagram and logic symbol.
• Figure 5-6. OR gate stages, schematic diagram and logic symbol.
• Figure 5-7. Amplifier stages, schematic diagram and logic symbol.
• Transmit Output and Carrier Alarm Circuits
• Receive Input and Carrier Alarm Circuits
• Talk-Request Detector Timing Circuits
• Initial Timer
• Demodulator Circuits
• Dual Output Polar Driver Circuits
• Delay Equalization Circuits
• Send Timing
• External Clock
• Figure 5-8. Phase-lock loop, timing waveforms.
• Receive Timing
• Clock Correction
• Figure 5-9. Receive timing add-subtract control logic waveforms.
• Receive Data cont'd
• Order-wire Circuit Operation
• Alarm Circuits
• Loss-of-Transmit-Carrier Alarm
• Loss-of-Receive-Carrier Alarm
• Common Alarm Circuitry
• Chapter 6 DIRECT SUPPORT AND GENERAL SUPPORT AND DEPOT MAINTENANCE
• Operational Tests
• Preliminary Procedures
• Figure 6-1. Operational tests, connection diagram.
• Figure 6-2. Printed-circuit cord assembly A1 (PC 80034090), component location diagram
• Figure 6-3. Printed-circuit card assembly A2 (PC 80034100),component location diagram
• Figure 6-4. Printed-circuit card assembly A3 (PC 80034140), component location diagram
• Figure 6-5. Printed-circuit card assembly A4 (PC 80034080), component location diagram.
• Figure 6-6. Printed-circuit card assembly A5 (PC 80034150), component location diagram.
• Figure 6-7. Printed-circuit card assembly A6 (PC 80034120), component location diagram.
• Figure 6-8. Printed-circuit card assembly A7 (PC 80034130), component location diagram.
• Figure 6-9. Printed-circuit card assembly A8 (PC 80034020), component location diagram.
• Figure 6-10. Printed-circuit card assembly A9 (PC 80034050), component location diagram.
• Figure 6-11. Printed-circuit card assembly A10 (PC 80034040), component location diagram.
• Figure 6-12. Printed-circuit card assembly A11 (PC 80034030), component location diagram.
• Figure 6-13. Printed-circuit card assembly A12 (PC 80034060), component location diagram.
• Figure 6-14. Printed-circuit card assembly A13 (PC 80034010), adapter card diagram.
• Figure 6-15. Printed-circuit card assembly A14 (PC 80034170), component location diagram.
• Figure 6-16. Printed-circuit cord assembly A15 (PC 80034160), component location diagram.
• Figure 6-18. Power supply submodule, component location diagram.
• Figure 6-19. Printed-circuit card assembly A18A1A1 through AS1A1 (PC 80034210), component location diagram
• Figure 6-22. Printed-it card assembly A18A2, A19A2 (PC 80034200), component location diagram.
• Figure 6-23. Printed-circuit card assembly A20A2, A21A2, A22A2 (PC 80034190), component location diagram.
• Figure 6-24. Printed-circuit card assembly A23A2 through A29A2 (PC 80034180), component location diagram.
• Figure 6-25. Printed-circuit card assembly A25A3 (PC 80034230), component location diagram.
• Figure 6-26. Printed-circuit card assembly A33A2 (PC 80034110), component location diagram.
• Figure 6-27. Modem, Low Speed Wire Line MD-674(P)/G, removed from case, top view.
• Figure 6-28. Modem, Low Speed Wire Line MD-674(P)/G, removed from case, bottom view.
• Figure 6-29. Modem, Low speed Wire Line 74 (P)/G, removed from, case, front panel, rear view.
• Figure 6-30. Plug-in module of Modem Subassembly MX-73(*)/G, bottom view.
• Figure 6-31. PC card assembly A1 (PC 80034090) voltage and resistance diagram.
• Figure 6-32. PC card assembly A3 (PC 80034140) voltage and resistance diagram.
• Figure 6-33. PC card assembly A5 (PC 80034150) voltage and resistance diagram.
• Figure 6-34. PC card assembly A6 (PC 80034130) voltage and resistance diagram.
• Figure 6-35. PC card assembly, A8 (PC 80034120) voyage and resistance diagram.
• Figure 6-36. PC card assembly A9 (PC 80034050 ) voltage and resistance diagram.
• Figure 6-37. PC card assembIy A10 (PC 80034040) voltage and resistance diagram.
• Figure 6-38. PC card assembIy A11 (PC 80034030) voltage and resistance diagram.
• Figure 6-39. PC card assembIy A14 (PC 80034170) voltage and resistance diagram.
• Figure 6-40. PC card assembIy A15 (PC 80034160) voltage and resistance diagram.
• Figure 6-41. PC card assembIy A25A3 (PC 80034230) voltage and resistance diagram.
• Localizing Troubles
• Troubleshooting Chart-Continued
• Troubleshooting Chart-Continued
• Troubleshooting Chart-Continued
• Troubleshooting Chart-Continued
• Troubleshooting Chart-Continued
• Troubleshooting Chart-Continued
• Troubleshooting Chart-Continued
• Troubleshooting Chart-Continued
• Troubleshooting Chart-Continued
• Troubleshooting Chart-Continued
• Isolating Troubles in Logic Gates
• Isolating Troubles in Amplifier Stages
• Repair Procedures
• Repair Procedures cont'd
• Chapter 7 GENERAL SUPPORT TESTING PROCEDURES
• Physical Tests and Inspection
• Data Test
• Procedure- Continued
• Procedure- Continued
• Procedure- Continued
• Timing Tests
• Timing Tests cont'd
• Alarm Tests
• Alarm Tests cont'd
• Alarm Tests cont'd
• Alarm Tests cont'd
• Summary of Performance Standards
• Timing Tests
• Alarm Tests
• CHAPTER 8 ADJUSTMENTS AND FINAL TESTING
• Adjustment of Variable Control Oscillator (VCO)
• Alarm Adjustments
• Receiver Carrier Alarm Adjustments
• Order-Wire Circuit Adjustments
• Figure 8-1. Modem, Low Speed Wire Line MD-674(*)/G, removed from case, top view, Less Modem Subassembly MX-73(*)/G and Clock Module Group OA-8072/G, adjustment at locations
• Figure 8-2. Frequency determining module (FDM) waveform check.
• Figure 8-18. ±6 volt power supply regulator circuits assembly A14 (PC 80034170), schematic diagram.
• CHAPTER 8.1
• Input Capacitance Tests
• Input Impedance Tests
• Input Resistance Test
• APPENDIX A REFERENCES
• APPENDIX B MAINTENANCE ALLOCATION
• Tool and Test Equipment Requirements
• SECTION II MAINTENANCE ALLOCATION CHART FOR MODEM, LOW SPEED WIRE LINE MD-674(P)/G
• SECTION II MAINTENANCE ALLOCATION CHART FOR MODEM, LOW SPEED WIRE LINE MD-674(P)/G cont'd
• SECTION II MAINTENANCE ALLOCATION CHART FOR MODEM, LOW SPEED WIRE LINE MD-674(P)/G cont'd
• SECTION II MAINTENANCE ALLOCATION CHART FOR MODEM, LOW SPEED WIRE LINE MD-674(P)/G cont'd
• SECTION II MAINTENANCE ALLOCATION CHART FOR MODEM, LOW SPEED WIRE LINE MD-674(P)/G cont'd
• SECTION II MAINTENANCE ALLOCATION CHART FOR MODEM, LOW SPEED WIRE LINE MD-674(P)/G cont'd
• SECTION II MAINTENANCE ALLOCATION CHART FOR MODEM, LOW SPEED WIRE LINE MD-674(P)/G cont'd
• SECTION III TOOL AND TEST EQUIPMENT REQUIREMENTS FOR MODEM, LOW SPEED WIRE LINE MD-674(P)/G
• SECTION IV. REMARKS
• APPENDIX C COMPONENTS OF END ITEM LIST
• SECTION II. COMPONENTS OF END ITEM
• SECTION II. COMPONENTS OF END ITEM
• SECTION II. COMPONENTS OF END ITEM
• SECTION II. COMPONENTS OF END ITEM
• SECTION II. COMPONENTS OF END ITEM
• Figure 5-3. Two-input bistable stages, -6-volt clamped output, schematic diagram and logic symbol.
• Figure 6-17. printed-circuit card assembly A 16 (PC 80034070), harness card diagram.
• Figure 6-42, Main chassis voltage and resistance diagram.
• Figure 6-43. Plug-in module of Modem .;Subassembly MX-7372/ G. MX. 7374 / G, MX- 7376/ G
• Figure 6-44. Plug-in module of Modem .;Subassembly MX-7373/ G. MX. 7375 / G, MX- 7377/ G
• Figure 6-45. Plug-in module Subassembly MX-78379/G, wiring diagram
• Figure 6-46. Power supply submodule (assembly A1A17) wiring diagram
• Figure 7-. Test setup, alarm test.
• Figure 7-1. Test setup, data tests.
• Figure 7-2. Test setup, timing tests.
• Figure 8-3. Color code markings for MIL-STD resistors, capacitors, and inductors.
• Figure 8-4. Modem, low speed wire line MD-674 (P)/G, block diagram.
• Figure 8-5. Modem, Low Speed Wire Line MD-674(P)/G, logic diagram.
• Figure 8-6. Variable-control oscillator circuits assembly A1 (PC 80034090) schematic diagram.
• Figure 8-7. 128 divider-A circuits assembly A2 (PC80034100), schematic diagram.
• Figure 8-8. Add-subtract logic and talk request generator circuits assembly A3 (PC 80034140), schematic diagram.
• Figure 8-9. 128 divider-B circuits assembly A4 (PC80034080), schematic diagram.
• Figure 8-10. Dual output polar driver circuits assembly A5 (PC 80034150), schematic diagram.
• Figure 8-11. Transmit output aid carrier alarm circuits assembly A 6 (PC 80034120), schematic diagram.
• Figure 8-12. 64 divider circuits assembly A7 (PC 80034130. schematic diagram.
• Figure 8-13. Demodulator circuits assembly A8 (PC 80034020), schematic diagram.
• Figure 8-14. Receive input and carrier alarm circuits assembly A9 (PC 80034050), schematic diagram.
• Figure 8-15. Talk-request detector circuits assembly A10 (PC 80034040), schematic diagram.
• Figure 8-16. Receive data output circuits assembly A11 (PC 80034030), schematic diagram.
• Figure 8-17. Input interface and common alarm circuits assembly A12 (PC80034060), schematic diagram.
• Figure 8-19. ±15-volt power supply regulator circuits assembly A15 (PC 80034160), schematic diagram.
• Figure 8-20. Ac power and rectifier circuit, modem chassis, and power supply submodule, schematic diagram.
• Figure 8-21. Crystal oscillator and regulator circuit assemblies A1A18A1-A32A1A1 and A18A1A2-A32A1A2 (PC 80034210, PC80034220), schematic diagram.
• Figure 8-22. One-stage frequency divider circuit assemblies A23A2-A292 (PC 80034180), schematic diagram.
• Figure 8-23. Two-stage frequency divider circuit assemblies A20A2, A21A2, and A22A2 (PC 80034190) schematic diagram.
• Figure 8-24. Three-stage frequency divider circuit assemblies A18A2 and A19A2 (PC 80034200), schematic diagram.
• Figure 8-25. Delay equalizer circuits for MX-7379/G (PC 80034230), schematic diagram.
• Figure 8-26. Delay equalization circuits (except MX-7379/G) schematic diagrams.
• Figure 8-27. Clock divider circuits assembly A33A2 (PC 80034110) schematic diagram.
• Figure 8-28(1). Modem chassis overall wiring diagram (part 1 of 3).
• Figure 8-28(2). Modem chassis overall wiring diagram (part 2 of 3).
• Figure 8-28(3). Modem chassis overall wiring diagram (part 3 of 3).
• The Metric System and Equivalents
• TM-11-5805-424-15
• Recommended Changes to Equipment Technical Publications
• Blank Page