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Page Title: TM-11-6625-467-34

• DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL - TEST SET, ELECTRONIC CIRCUIT PLUG-IN UNIT AN/ARM-87
• WARNING
• 5 SAFETY STEPS TO FOLLOW IF SOMEONE IS THE VICTIM OF ELECTRICAL SHOCK
• Table of Contents
• LIST OF ILLUSTRATIONS
• LIST OF TABLES
• Chapter 1. INTRODUCTION
• Chapter 2. FUNCTIONING OF EQUIPMENT
• Signal Paths
• Figure 2-1. Frequency selector switch circuit, functional diagram.
• Figure 2-2. Test Set Voltmeter Circuit, Functional Diagram
• Figure 2-3. 150 Hz oscillator/counter circuit functional diagram.
• Figure 2-4. 1kHz oscillator circuit, functional diagram.
• Figure 2-6. 500-kHz fm oscillator circuit ,functional diagram.
• Figure 2-7. 3.975-MHz osillator circuit, functional diagram.
• Figure 2-8. 5.925 MHz oscillator circuit, functional diagram
• Figure 2-9. 30 MHz oscillator circuit, functional diagram.
• Figure 2-10. 68 MHz osillator circuit, functional diagram.
• Figure 2-11. 500 kHz switch circuit, functional diagram.
• Figure 2-13. 500 kHz filter circuit, functional diagram.
• Figure 2-15. 500 kHz discriminator circuit, functional diagram.
• Table 2-1. RF Subchassis Test Switch Positions
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-1. RF Subchassis Test Switch Positions (cont)
• Table 2-2. Homer Module Test Switch Positions
• Table 2-2. Homer Module Test Switch Positions (cont)
• Table 2-2. Homer Module Test Switch Positions (cont)
• Table 2-2. Homer Module Test Switch Positions (cont)
• Table 2-3. Receive Audio Module Test Switch Positions
• Table 2-3. Receive Audio Module Test Switch Positions (cont)
• Table 2-3. Receive Audio Module Test Switch Positions (cont)
• Table 2-3. Receive Audio Module Test Switch Positions (cont)
• Table 2-3. Receive Audio Module Test Switch Positions (cont)
• Table 2-4. Transmit Audio Module Test Switch Positions
• Table 2-4. Transmit Audio Module Test Switch Positions (cont)
• Table 2-4. Transmit Audio Module Test Switch Positions (cont)
• Table 2-4. Transmit Audio Module Test Switch Positions (cont)
• Table 2-4. Transmit Audio Module Test Switch Positions (cont)
• Table 2-4. Transmit Audio Module Test Switch Positions (cont)
• Table 2-5. Fixed IF Module Test Switch Positions
• Table 2-5. Fixed IF Module Test Switch Positions (cont)
• Table 2-5. Fixed IF Module Test Switch Positions (cont)
• Table 2-5. Fixed IF Module Test Switch Positions (cont)
• Table 2-5. Fixed IF Module Test Switch Positions (cont)
• Table 2-6. Sel-Call Module Test Switch Positions
• Table 2-6. Sel-Call Module Test Switch Positions (cont)
• Table 2-6. Sel-Call Module Test Switch Positions (cont)
• Table 2-7. Power Supply Module Test Switch Positions
• Table 2-7. Power Supply Module Test Switch Positions (cont)
• Signal Paths (Operator's PMCS chart) of CIRCUIT SELECTOR Switches
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• Table 2-8. Circuit Selector Switches Signal Paths
• c
• Table 2-8. Circuit Selector Switches Signal Paths (cont)
• Table 2-8. Circuit Selector Switches Signal Paths (cont)
• Section Il. DETAILED CIRCUIT FUNCTIONING
• Figure 2-17. 150-Hz Oscillator/Counter Circuit. Simplified Schematic Diagram
• Figure 2-18. 1 kHz oscillator circuit simplified schematic diagram.
• Figure 2-19. 10-kHz oscillator circuit, simplified schematic diagram
• Figure 2-20. 500-kHz fm oscillator circuit, simplified schematic digram.
• Figure 2-21. 3.975 MHz oscillutor circuit simplified schematic diagram.
• Figure 2-22.30 MHz oscillator circuit, simplied schematic diagram.
• Figure 2-23. Distortion detector circuit simplified schemattic diagram.
• Figure 2-24 Audio amplifier/detector circuit, simplified schematic diagram.
• Figure 2-25. RF amplifier/detector circuit, simplified schematic diagram.
• Figure 2-26. 500-kHz Filter Circuit, Simplified Schematic Diagram
• 500 kHz Switch
• Figure 2-27. 500-kHz switch circuit, simplified schematic diagram.
• Figure 2-28. 500-kHz Discriminator Circuit, Simplified Schematic Diagram
• 30 MHz Switch
• Figure 2-29. 30 MHz switch circuit, simplified schematic diagram.
• Power Supply Circuits
• Figure 2-31. Frequency selector switch circuit, simplified schematic diagram.
• Table 2-9. 005 Megahertz Selector Switch Coding
• Table 2-10. Whole Megahertz Selector Switch Coding
• Table 2-10. Whole Megahertz Selector Switch Coding (cont)
• -28 Volt Regulator
• Despike Testing Circuit
• High Voltage Power Supply
• CIRCUIT SELECTOR Switches
• CIRCUIT SELECTOR Switches (cont)
• Chapter 3. DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
• Servicing Transistor Circuits
• Localizing Troubles
• Isolating Troubles
• Figure 3-1. DC Power Distribution, Schematic Diagram
• Figure 3-2. Test set, front panel component identification.
• Figure 3-3. Test set parts location, right side view.
• Figure 3-.4. Test set parts location, left side view.
• Figure 3-5. Test set parts location, top view.
• Figure 3-6. Test set parts location, rear subpanel.
• Figure 3-7. Test set parts location card cage (cards removed).
• Figure 3-8. Test set parts location, case.
• Figure 3-10. Blower wall parts location, top view.
• Figure 3-11. Load/500-kHz filter circuit card HV7, parts location.
• Figure 3-12. 150-Hz oscillator/counter circuit card HU8, parts location.
• Figure 3-13. 1-kHz/10-kHz oscillator circuit card HU9, parts location.
• Figure 3-14, 500-kHz fm oscillator circuit card HV2, parts location.
• igure 3-15. Audio amplifier/detector circuit card HU7, parts location.v
• Figure 3-16. +28-volt regulator circuit card HU4, parts location.
• Figure 3-17. High voltage power supply circuit card HU5, parts location.
• Figure S-18. 28-volt regulator circuit card HU3, parts location.
• Figure 3-19. Load No. 1 circuit card HV5, parts location.
• Figure 9-20. 3.975/5.925 MHz oscillator circuit card HV4, parts location.
• Figure 3-21. 30-MHz oscillutor circuit card HV8, parts location
• Figure 3-22. 68-MHz oscillator circuit card HW2, parts location.
• Figure 3-23. RF amplifier/detector switch circuit card HV3, parts location.
• Figure 3-24. Power detector assembly A14, parts location.
• Table 3-2. VOLTAGE AND RESISTANCE READINGS
• Table 3-2. VOLTAGE AND RESISTANCE READINGS (cont)
• Table 3-2. VOLTAGE AND RESISTANCE READINGS (cont)
• Table 3-2. VOLTAGE AND RESISTANCE READINGS (cont)
• Table 3-2. VOLTAGE AND RESISTANCE READINGS (cont)
• Table 3-2. VOLTAGE AND RESISTANCE READINGS (cont)
• Table 3-2. VOLTAGE AND RESISTANCE READINGS (cont)
• Section II. MAINTENANCE OF TEST SET, ELECTRONIC CIRCUIT PLUG-IN UNIT AN/ARM-87
• Figure 3-25.Oscilloscope Waveforms.
• Removal and Replacement of Stud-Type Diodes
• Removal and Replacement of Transistors Q2 and Q3
• Figure 3-27. Blower well assembly, exploded view.
• Removal and Replacement of Blower Motor
• General Adjustment Procedures
• -28-Volt Regulator Adjustment
• 1-kHz Oscillator Adjustment
• 5.925 MHz Oscillator Detector Output Amplitude Adjustment
• Figure 3-28. 500-kHz oscillator deviation sensitivity adjustment, test setup.
• Despike Detector Adjustment
• 68-MHz Oscillator Tuning Adjustment
• Figure 3-31. Power detector adjustment, test equipment setup.
• Figure 3-32. Load/500-kHz filter circuit card, schematic diagram (assembly A1).
• Figure 3-33. 150-Hz Oscillator/Counter Circuitt Card, Schematic Diagram (Assembly A21)
• Figure 3-34. 1-kHz/10-kHz oscillator circuit card, schematic diagram (assembly A3)
• Figure 3-35. 500-kHz FM Oscillator Circuit Card, Schematic Diagram (Assembly A4)
• Figure 3-36. Audio Amplifier/Detector Circuit Card, Schematic Diagram (Assembly A5)
• Figure 3-37. +28-volt regulator circuit card, schematic diagram (assembly A6).
• Figure 3-38. High Voltage Power Supply Circuit Card, Schematic Diagram (Assembly A7)
• Figure 3-39. -28 Volt Regulator Circuit Card, Schematic Diagram (Assembly A8)
• Figure 3-40. Load No. 1 circuit card, schematic diagram (assembly A9).
• Figure 3-41. 3.975-5.925 mHz oscillator circuit card, schematic diagram (assembly A10).
• Figure 3-42. 3-42. MHz oscillator circuit card schematic diagram (assembly A11).
• Figure 3-43. 68-MHz oscillator circuit card, schrematic diagram (assembly A12).
• Figure 3-44. RF Amplifier/Detector Switch Circuit Card, Schematic Diagram (Assembly A13)
• Appendix A. REFERENCES
• FO-1. Resistor and Capacitor Color Code Chart
• FO-2. Power Supply Circuits, Simplified Schematic Diagram
• FO-3. Circuit Selector Switches Circuit, Functional Diagram (Sheet 1 of 2)
• FO-3. Circuit Selector Switches Circuit, Functional Diagram (Sheet 2 of 2)
• FO-4. Card Cage, Exploded View
• FO-5. Test Set Chassis, Schematic Diagram (Sheet 1 of 3)
• FO-5. Test Set Chassis, Schematic Diagram (Sheet 2 of 3)
• FO-5. Test Set Chassis, Schematic Diagram (Sheet 3 of 3)
• FO-6. Test Set Chassis, Schematic Diagram For Serial-Numbered Sets 14 and Higher (Sheet 1 of 3)
• FO-6. Test Set Chassis, Schematic Diagram For Serial-Numbered Sets 14 and Higher (Sheet 2 of 3)
• FO-6. Test Set Chassis, Schematic Diagram For Serial-Numbered Sets 14 and Higher (Sheet 3 of 3)
• INDEX
• INDEX (cont)
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• Recommended Changes to Equipment Technical Publicationsv
• Recommended Changes to Equipment Technical Publications
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• TM-11-6625-467-34
• Recommended Changes to Equipment Technical Publications
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• Recommended Changes to Equipment Technical Publications
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• By Order of the Secretary of the Army
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• Recommended Changes to Equipment Technical Publications
• Recommended Changes to Equipment Technical Publications
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