CHAPTER 1. INTRODUCTION - TM-11-6125-256-340008
CHAPTER 2. Functioning of Equipment - TM-11-6125-256-340009
Section II OVERALL CIRCUIT ANALYSIS
Electronic Section (4B93-1-A)
Section III. CIRCUIT ANALYSIS
Control Circuits
Voltage Regulation (4B93-1-A)
CHAPTER 3. DIRECT SUPPORT MAINTENANCE INSTRUCTIONS - TM-11-6125-256-340015
Section II. IN-AIRCRAFT MAINTENANCE
Figure 3-1. Voltage and frequency adjustments
Table 3-1. In-Aircraft Troubleshooting
Table 3-1. In-Aircraft Troubleshooting-continued
Section III BENCH TESTING
Figure 3-2. Connections for performance tests
Table 3-2. Bench Troubleshooting
Table 3-2. Bench Troubleshooting-continued
Section IV. MAINTENANCE
Figure 3-3. Replacement of brushes
Figure 3-4. Connections for brush run-in.
Replacement of Voltage and Frequency Regulator Assembly, Type 4B48-6-A.
Figure 3-5. Removal and installation of voltage and frequency regulator assembly 4B48-6-A
Table 3-3. Physical Tests and Inspections
Table 3-4. Voltage and Frequency Test
Replacement of Voltage and Frequency Regulator Assembly, Type 4B93-1-A.
Figure 3-6. Removal and replacement of voltage and frequency regulator assembly 4B93-1-A
CHAPTER 4. GENERAL SUPPORT MAINTENANCE INSTRUCTIONS - TM-11-6125-256-340033
Motor Stator
Figure 4-1. Interconnection wiring diagram and motor-generator PU-750()/A
Section III. REPAIR OF VOLTAGE AND FREQUENCY REGULATOR ASSEMBLY 4B48-6-A
Figure 4-2.1. Interconnection wiring diagram for motr-generator PU-750A/A
Test Setup for Troubleshooting Voltage and Frequency Regulator Assembly-continued
Termination Definition
Figure 4-3. Interconnection wiring diagram for voltage and frequency regulator assembly 4B48-6-A
Troubleshooting Voltage Measurements
Replacement of Regulator Board
Section III.1 REPAIR OF VOLTAGE AND FREQUENCY REGULATOR ASSEMBLY 4B93-1-A
Figure 4-3.3. Typical waveshape across capacitor C5
Figure 4-3.4. Typical waveshape at transistor Q9
Figure 4-3.5. Typical waveshapes at transistor Q7
Figure 4-3.6. Typical waveshape across capacitor C4
Figure 4-3.7. Typical waveshapes at transistor Q8
Figure 4-3.8. Typical waveshapes at transistor Q11
Figure 4-3.9. Typical waveshape at the junction of resistors R7 and R17
Figure 4-3.11. Typical waveshape across capacitor C1
Figure 4-3.12. Typical waveshapes at transistor Q2
Figure 4-3.13. Typical waveshapes at transistor Q3
Figure 4-3.14. Typical waveshapes at transistor Q4
Figure 4-3.15. Typical waveshapes at transistor Q5
Figure 4-3.16. Typical waveshapes at transistor Q6
Removal and Repair
Section IV. REPAIR OF CONTROL BOX ASSEMBLY COMPONENTS
Section V. ELECTRICAL COMPONENT TESTS
Table 4-1. Capacitor Test Values
Table 4-2. Semiconductor Device Test Values for 4B48-6-A
Transformer and Reactors (PU-750()/A)
Figure 4-4. Test setup for transformer T1
Transistors
Table 4-4. Power Transistor Test Values for 4B48-6-A
Table 4-4.1. Transistor Test Values for PU-750A/A
TABLE 4-5. Resistance Tests for PU-750()/A
Table 4-5.1. Resistance Tests for PU-750A/A
Voltage and Frequency Regulator Assembly
LEGEND FOR FIGURE 4-5-continued
Figure 4-5. Voltage and frequency regulator assembly
Legend for Figure 4-51
Figure 4-5.1. Voltage and frequency regulator assembly (4B93-1-A)
Legend for Figure 4-6
Figure 4-6. Control box assembly
Current Relay Assembly
DC End Bell Assembly
Figure 4-7. Current relay assembly
Figure 4-8. Dc end bell assembly
Figure 4-9. Ac end bell assembly
Figure 4-10. Electrical rotating equipment housing assembly
Cleaning - TM-11-6125-256-340082
Inspection - TM-11-6125-256-340083
Repair or Replacement - TM-11-6125-256-340084
Section VII. GENERAL SUPPORT TEST PROCEDURE
Setting Brush Neutral - TM-11-6125-256-340086
Rotational Balance Test
LEGEND FOR FIGURE FO-2
Figure FO-1. Block diagram for motor-generator
Figure FO-2. Schematic diagram for motor-generator PU-750( )/A
Figure FO-2.1. Schematic diagram for motor-generator PU-750A/A - TM-11-6125-256-340098
Figure FO-2.1. Schematic diagram for motor-generator PU-750A/A - TM-11-6125-256-340099
Legend for Figure FO-3
Figure FO-3. Motor-generator
MICROFORM TEST TARGET - TM-11-6125-256-340105
TM-11-6125-256-34 Motor-Generator PU-750/A Manual
CHAPTER 2. Functioning of Equipment - TM-11-6125-256-340009
Section II OVERALL CIRCUIT ANALYSIS
Electronic Section (4B93-1-A)
Section III. CIRCUIT ANALYSIS
Control Circuits
Voltage Regulation (4B93-1-A)
CHAPTER 3. DIRECT SUPPORT MAINTENANCE INSTRUCTIONS - TM-11-6125-256-340015
Section II. IN-AIRCRAFT MAINTENANCE
Figure 3-1. Voltage and frequency adjustments
Table 3-1. In-Aircraft Troubleshooting
Table 3-1. In-Aircraft Troubleshooting-continued
Section III BENCH TESTING
Figure 3-2. Connections for performance tests
Table 3-2. Bench Troubleshooting
Table 3-2. Bench Troubleshooting-continued
Section IV. MAINTENANCE
Figure 3-3. Replacement of brushes
Figure 3-4. Connections for brush run-in.
Replacement of Voltage and Frequency Regulator Assembly, Type 4B48-6-A.
Figure 3-5. Removal and installation of voltage and frequency regulator assembly 4B48-6-A
Table 3-3. Physical Tests and Inspections
Table 3-4. Voltage and Frequency Test
Replacement of Voltage and Frequency Regulator Assembly, Type 4B93-1-A.
Figure 3-6. Removal and replacement of voltage and frequency regulator assembly 4B93-1-A
CHAPTER 4. GENERAL SUPPORT MAINTENANCE INSTRUCTIONS - TM-11-6125-256-340033
Motor Stator
Figure 4-1. Interconnection wiring diagram and motor-generator PU-750()/A
Section III. REPAIR OF VOLTAGE AND FREQUENCY REGULATOR ASSEMBLY 4B48-6-A
Figure 4-2.1. Interconnection wiring diagram for motr-generator PU-750A/A
Test Setup for Troubleshooting Voltage and Frequency Regulator Assembly-continued
Termination Definition
Figure 4-3. Interconnection wiring diagram for voltage and frequency regulator assembly 4B48-6-A
Troubleshooting Voltage Measurements
Replacement of Regulator Board
Section III.1 REPAIR OF VOLTAGE AND FREQUENCY REGULATOR ASSEMBLY 4B93-1-A
Figure 4-3.3. Typical waveshape across capacitor C5
Figure 4-3.4. Typical waveshape at transistor Q9
Figure 4-3.5. Typical waveshapes at transistor Q7
Figure 4-3.6. Typical waveshape across capacitor C4
Figure 4-3.7. Typical waveshapes at transistor Q8
Figure 4-3.8. Typical waveshapes at transistor Q11
Figure 4-3.9. Typical waveshape at the junction of resistors R7 and R17
Figure 4-3.11. Typical waveshape across capacitor C1
Figure 4-3.12. Typical waveshapes at transistor Q2
Figure 4-3.13. Typical waveshapes at transistor Q3
Figure 4-3.14. Typical waveshapes at transistor Q4
Figure 4-3.15. Typical waveshapes at transistor Q5
Figure 4-3.16. Typical waveshapes at transistor Q6
Removal and Repair
Section IV. REPAIR OF CONTROL BOX ASSEMBLY COMPONENTS
Section V. ELECTRICAL COMPONENT TESTS
Table 4-1. Capacitor Test Values
Table 4-2. Semiconductor Device Test Values for 4B48-6-A
Transformer and Reactors (PU-750()/A)
Figure 4-4. Test setup for transformer T1
Transistors
Table 4-4. Power Transistor Test Values for 4B48-6-A
Table 4-4.1. Transistor Test Values for PU-750A/A
TABLE 4-5. Resistance Tests for PU-750()/A
Table 4-5.1. Resistance Tests for PU-750A/A
Voltage and Frequency Regulator Assembly
LEGEND FOR FIGURE 4-5-continued
Figure 4-5. Voltage and frequency regulator assembly
Legend for Figure 4-51
Figure 4-5.1. Voltage and frequency regulator assembly (4B93-1-A)
Legend for Figure 4-6
Figure 4-6. Control box assembly
Current Relay Assembly
DC End Bell Assembly
Figure 4-7. Current relay assembly
Figure 4-8. Dc end bell assembly
Figure 4-9. Ac end bell assembly
Figure 4-10. Electrical rotating equipment housing assembly
Cleaning - TM-11-6125-256-340082
Inspection - TM-11-6125-256-340083
Repair or Replacement - TM-11-6125-256-340084
Section VII. GENERAL SUPPORT TEST PROCEDURE
Setting Brush Neutral - TM-11-6125-256-340086
Rotational Balance Test
LEGEND FOR FIGURE FO-2
Figure FO-1. Block diagram for motor-generator
Figure FO-2. Schematic diagram for motor-generator PU-750( )/A
Figure FO-2.1. Schematic diagram for motor-generator PU-750A/A - TM-11-6125-256-340098
Figure FO-2.1. Schematic diagram for motor-generator PU-750A/A - TM-11-6125-256-340099
Legend for Figure FO-3
Figure FO-3. Motor-generator
MICROFORM TEST TARGET - TM-11-6125-256-340105
TM-11-6125-256-34 Motor-Generator PU-750/A Manual
