SPECTRUM ANALYZER (TEKTRONIX, INC. MODEL 491)
Fig. 1-1. The Type 491 Spectrum Analyzer.
Section I. CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
TIME BASE
ENVIRONMENTAL CHARACTERISTICS
Section II. OPERATING INSTRUCTIONS
Spectrum Analyzer Terms
Optimum resolution
Time Base Controls
Fig. 2-4. Front panel controls and connectors.
Rear Panel
GENERAL OPERATING INFORMATION
Trace Alignment
Fig. 2-7. Changing band C Coaxial Mixer to Wave Guide Adapter,
Mixer Peaking
Fig. 2-9. Frequency spectrum of a pulsed cw signal.
Video Filter Operation
Triggering the Sweep
RF Center Frequency Tuning
Fig. 2-16. Typical LOCK CHECK displays
Figure 2-17. Control Setup Chart
Spectrum of Amplitude Modulation
Frequency Modulated Signal Spectrum
Identification and Frequency Measurement of Displayed Signals
Fig. 2-22. Pulse shaping effects on the pulse spectrum.
Relative Amplitude Measurements
Frequency Stability
Frequency Modulated Spectrum
Measurements of Pulse Modulated RF Signals
Section 3. CIRCUIT DESCRIPTION
Figure 3-1. Function Block diagram of the Type 49.1
Phase Lock Circuit
Fig. 3-3. Phase lock block diagram.
Sweeper Circuit
Fig. 3-5. Block diagram of sweeper circuits.
Fig. 3-7. Frequency vs Voltage curves for kHz/DIV discriminator circuit
Wide Band (1 50-250 MHz) Amplifier and Second Mixer
Fig. 3-8. Crystal variable resolution filter.
Fig. 3-10. Block diagram of the video detector and vertical amplifier.
Variable Resolution Amplifier
Trigger Generator, Sweep Generator and Horizontal Amplifier
CRT and Blanking Circuit - TM-9-6625-2467-150045
Low Voltage Power Supply
Low Voltage Power Supply - continued
Section IV. MAINTENANCE
Visual Inspection
Resistor Color Code
Removing the Honeycomb Assembly
Fig. 4-4. Power Supply Circuit board assembly with wiring color code.
Fig. 4-5. Horizontal Display circuit board assembly showing color code to pin connectors.
Fig. 4-6. IF Control board assembly. Wiring color code to pin connector.
Cathode-Ray Tube Replacement
Fig. 4-9. Phase lock assembly and wiring color code to the pin connector.
Fig. 4-12. Removing the CRT assembly,
Removing the SOURCE, SLOPE switch and LEVEL control
Fig. 4-15. Removing the Phase Lock assembly.
Fig. 4-16. Removing the phase-lock assembly board.
Component Replacement
Replacing Components on the Circuit Boards
Fig. 4-20A. Tube subassembly removal procedure.
Fig. 4-20B. Tube subassembly installation procedure.
Replacing Components on Metal Terminals
Transistor Substitution and Replacement
Fig. 4-22. Power supply board assembly with component call out.
Fig. 4-23 Vertical Amplifier and Blanking board assembly with component call out.
Fig. 4-24. IF control board assembly with component call out. - TM-9-6625-2467-150070
Fig. 4-24. IF control board assembly with component call out. - TM-9-6625-2467-150071
Fig. 4-25. Horizontal display board with component call out. - TM-9-6625-2467-150072
Fig. 4-25. Horizontal display board with component call out. - TM-9-6625-2467-150073
Fig. 4-26. Phase lock board with component call out.
Section 5. PERFORMANCE CHECK
PERFORMANCE CHECK PROCEDURE
Check Saw Out Signal Amplitude - TM-9-6625-2467-150077
Check Internal Triggering
Fig. 5-2. Measuring dispersion accuracy.
Check Dispersion Accuracy of kHz/div Selections
Check Internal Reference Frequency
Check Accuracy of IF ATTENUATOR dB Selectors
Check INTENSIFIER Control Range
Check RF Center Frequency Calibration, System Sensitivity and Phase Lock Operation
Fig. 5-7. Signal to noise ratio for measuring sensitivity.
Fig. 5-8. Harmonic frequency markers used to check dial accuracy.
Check Amplitude of Spurious Signals from Internal Sources
Section 6. CALIBRATION
Fig. 6-1. Test equipment recommended for calibration of the Type 491.
Fig. 6-2. Test equipment recommended to measure the
Fig. 6-3. Recommended adjustment tools.
CALIBRATION RECORD AND INDEX
CALIBRATION RECORD AND INDEX - continued
CALIBRATION PROCEDURE
Fig. 6-4. Equipment setup for adjusting and checking the low and high voltage power supplies.
Fig. 6-5. Location of the low voltage check points.
Adjust Intensity Range
Adjust Trace Alignment
Fig. 6-9. Test equipment setup for adjusting Vertical Amplifier Gain.
Test Oscilloscope
Adjust Trigger Level Centering
Check External Triggering
Check line Triggering
Fig. 6-14. Equipment setup to check and adjust sweep circuits, Steps 12 through 20.
Check SAW OUT Signal Amplitude - TM-9-6625-2467-150106
Adjust Center Frequency Range
Fig. 6-19. Test equipment setup to adjust and check dispersion accuracy.
Fig. 6-20, Measuring dispersion accuracy.
Fig. 6-22. Dispersion calibration adjustments.
Fig. 6-23. Test equipment setup to adjust IF amplifier and the resolution bandwidth.
Fig. 6-24. Location of narrow band IF amplifier adjustments.
Fig. 6-27. Location of C504 and C508.
Fig. 6-29. Test equipment setup to adjust and check kHz/DIV dispersion accuracy.
Fig. 6-30. Adjustments for the kHz/DIV discriminator.
Fig. 6-31. Typical displays when checking or adjusting kHz/DIV
Fig. 4-32. Test equipment setup to check or adjust the phase lock circuit.
Fig. 6-33. Adjusting avalanche voltage.
Adjust Band C Balance then Band A and B Balance
Fig. 6-35. Test equipment setup to check dynamic range, IF GAIN control range, IF ATTENUATOR dB accuracy RECORDER signal out amplitude and incidental FM.
Check Dynamic Range of Vertical Display Modes
Fig. 6-36. Typical Video Filter integrated display of 200 MHz RF
Check Incidental Frequency Modulation
Fig. 6-38. Equipment setup to adjust wide band IF amplifier and check flatness.
Fig. 6-39. Wide band IF and Mixer tuning adjustments.
Adjust the Wide Band Amplifier Response and Check the System Response Flatness
Fig. 6-40. Equipment setup to check internal spurious responses.
Adjust Band A Mixer Balance--Check Amplitude of Spurious Signals from Internal Sources
Fig. 6-42. Typical equipment setup to check response flatness, sensitivity, frequency calibration and phase lock operation for band C.
Fig. 6-44. Signal to noise ratio for measuring sensitivity.
Alternate Procedure to Check Dial Accuracy, Oscillator Mixer `Operation and Effectiveness of Local Oscillator Phase Lock
Fig. 6- 45. Alternate equipment setup that will check dial accuracy, mixer and oscillator operation, and LO phase lock effectiveness.
Fig. 6-47. Harmonic frequency markers used to check dial accuracy.
ig. 6-47. Local oscillator assembly showing Voltage and signal connections.
Fig. 6-49. Local oscillator assembly showing drive shaft coupling and tuning adjustments.
Fig. 6-49. Band C Assembly Alignment Diagram.
ALIGNMENT PROCEDURE FOR BAND C OSCILLATOR ASSEMBLY
PARTS LIST ABBREVIATIONS
SPECIAL NOTES AND SYMBOLS
Section 7. ELECTRICAL PARTS LIST - TM-9-6625-2467-150141
Section 7. ELECTRICAL PARTS LIST - TM-9-6625-2467-150142
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150143
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150144
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150145
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150146
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150147
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150148
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150149
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150150
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150151
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150152
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150153
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150154
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150155
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150156
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150157
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150158
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150159
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150160
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150161
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150162
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150163
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150164
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150165
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150166
FIGURE AND INDEX NUMBERS
INDEX OR MECHANICAL PARTS LIST ILLUSTRATIONS
Section 8. MECHANICAL PARTS LIST
FIG. 1 FRONT (cont) - TM-9-6625-2467-150170
FIG. 1 FRONT (cont) - TM-9-6625-2467-150171
FIG. 1 FRONT (cont) - TM-9-6625-2467-150172
FIG. 2 REAR
FIG. 2 REAR (cont) - TM-9-6625-2467-150174
FIG. 2 REAR (cont) - TM-9-6625-2467-150175
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES - TM-9-6625-2467-150176
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES - TM-9-6625-2467-150177
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES - TM-9-6625-2467-150178
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES (cont) - TM-9-6625-2467-150179
FIG. 1 FRONT (cont) - TM-9-6625-2467-150180
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES (cont) - TM-9-6625-2467-150181
FIG. 4 POWER CHASSIS - TM-9-6625-2467-150182
FIG. 4 POWER CHASSIS - continued - TM-9-6625-2467-150183
FIG. 4 POWER CHASSIS - continued - TM-9-6625-2467-150184
FIG. 5 TiME/DIV SWITCH & OSCILLATOR ASSEMBLIES - TM-9-6625-2467-150185
FIG. 5 TiME/DIV SWITCH & OSCILLATOR ASSEMBLIES - continued - TM-9-6625-2467-150186
FIG. 5 TiME/DIV SWITCH & OSCILLATOR ASSEMBLIES - continued - TM-9-6625-2467-150187
FIG. 5 TiME/DIV SWITCH & OSCILLATOR ASSEMBLIES - continued - TM-9-6625-2467-150188
FIG. 6 CRT SHIELD ASSEMBLY - TM-9-6625-2467-150189
FIG. 7 CABINET ASSEMBLY AND HANDLE
Appendix A. BASIC ISSUE ITEMS LIST
Appendix B. MAINTENANCE ALLOCATION CHART
Overhaul
Section II. Maintenance Assignment
Appendix C. REPAIR PARTS LIST
Table C-1. Repair Parts List
Section 9. DIAGRAMS MECHANICAL PARTS LIST ILLUSTRATIONS ACCESSORIES
Important
Schematic Correction
Wide Band Amplifier
IF attenuator
Narrow Band Amplifier
Video Detector and Vertical Amplifier
Timing Switch
Power Supply
Power Distribution
CRT and Blanking Circuit - TM-9-6625-2467-150216
Spectrum Analyzer - TM-9-6625-2467-150217
Spectrum Analyzer - TM-9-6625-2467-150218
Spectrum Analyzer - TM-9-6625-2467-150219
FIG. 4 POWER CHASSIS - TM-9-6625-2467-150220
FIG. 5 TIME/DIV SWITCH & OSCILLATOR ASSEMBLIES - TM-9-6625-2467-150221
FIG. 6 CRT SHIELD ASSEMBLY - TM-9-6625-2467-150222
FIG. 7 CABINET ASSEMBLY & HANDLE
FIG. 8 491 STANDARD ACCESSORIES
TM-9-6625-2467-15 - index
Fig. 1-1. The Type 491 Spectrum Analyzer.
Section I. CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
TIME BASE
ENVIRONMENTAL CHARACTERISTICS
Section II. OPERATING INSTRUCTIONS
Spectrum Analyzer Terms
Optimum resolution
Time Base Controls
Fig. 2-4. Front panel controls and connectors.
Rear Panel
GENERAL OPERATING INFORMATION
Trace Alignment
Fig. 2-7. Changing band C Coaxial Mixer to Wave Guide Adapter,
Mixer Peaking
Fig. 2-9. Frequency spectrum of a pulsed cw signal.
Video Filter Operation
Triggering the Sweep
RF Center Frequency Tuning
Fig. 2-16. Typical LOCK CHECK displays
Figure 2-17. Control Setup Chart
Spectrum of Amplitude Modulation
Frequency Modulated Signal Spectrum
Identification and Frequency Measurement of Displayed Signals
Fig. 2-22. Pulse shaping effects on the pulse spectrum.
Relative Amplitude Measurements
Frequency Stability
Frequency Modulated Spectrum
Measurements of Pulse Modulated RF Signals
Section 3. CIRCUIT DESCRIPTION
Figure 3-1. Function Block diagram of the Type 49.1
Phase Lock Circuit
Fig. 3-3. Phase lock block diagram.
Sweeper Circuit
Fig. 3-5. Block diagram of sweeper circuits.
Fig. 3-7. Frequency vs Voltage curves for kHz/DIV discriminator circuit
Wide Band (1 50-250 MHz) Amplifier and Second Mixer
Fig. 3-8. Crystal variable resolution filter.
Fig. 3-10. Block diagram of the video detector and vertical amplifier.
Variable Resolution Amplifier
Trigger Generator, Sweep Generator and Horizontal Amplifier
CRT and Blanking Circuit - TM-9-6625-2467-150045
Low Voltage Power Supply
Low Voltage Power Supply - continued
Section IV. MAINTENANCE
Visual Inspection
Resistor Color Code
Removing the Honeycomb Assembly
Fig. 4-4. Power Supply Circuit board assembly with wiring color code.
Fig. 4-5. Horizontal Display circuit board assembly showing color code to pin connectors.
Fig. 4-6. IF Control board assembly. Wiring color code to pin connector.
Cathode-Ray Tube Replacement
Fig. 4-9. Phase lock assembly and wiring color code to the pin connector.
Fig. 4-12. Removing the CRT assembly,
Removing the SOURCE, SLOPE switch and LEVEL control
Fig. 4-15. Removing the Phase Lock assembly.
Fig. 4-16. Removing the phase-lock assembly board.
Component Replacement
Replacing Components on the Circuit Boards
Fig. 4-20A. Tube subassembly removal procedure.
Fig. 4-20B. Tube subassembly installation procedure.
Replacing Components on Metal Terminals
Transistor Substitution and Replacement
Fig. 4-22. Power supply board assembly with component call out.
Fig. 4-23 Vertical Amplifier and Blanking board assembly with component call out.
Fig. 4-24. IF control board assembly with component call out. - TM-9-6625-2467-150070
Fig. 4-24. IF control board assembly with component call out. - TM-9-6625-2467-150071
Fig. 4-25. Horizontal display board with component call out. - TM-9-6625-2467-150072
Fig. 4-25. Horizontal display board with component call out. - TM-9-6625-2467-150073
Fig. 4-26. Phase lock board with component call out.
Section 5. PERFORMANCE CHECK
PERFORMANCE CHECK PROCEDURE
Check Saw Out Signal Amplitude - TM-9-6625-2467-150077
Check Internal Triggering
Fig. 5-2. Measuring dispersion accuracy.
Check Dispersion Accuracy of kHz/div Selections
Check Internal Reference Frequency
Check Accuracy of IF ATTENUATOR dB Selectors
Check INTENSIFIER Control Range
Check RF Center Frequency Calibration, System Sensitivity and Phase Lock Operation
Fig. 5-7. Signal to noise ratio for measuring sensitivity.
Fig. 5-8. Harmonic frequency markers used to check dial accuracy.
Check Amplitude of Spurious Signals from Internal Sources
Section 6. CALIBRATION
Fig. 6-1. Test equipment recommended for calibration of the Type 491.
Fig. 6-2. Test equipment recommended to measure the
Fig. 6-3. Recommended adjustment tools.
CALIBRATION RECORD AND INDEX
CALIBRATION RECORD AND INDEX - continued
CALIBRATION PROCEDURE
Fig. 6-4. Equipment setup for adjusting and checking the low and high voltage power supplies.
Fig. 6-5. Location of the low voltage check points.
Adjust Intensity Range
Adjust Trace Alignment
Fig. 6-9. Test equipment setup for adjusting Vertical Amplifier Gain.
Test Oscilloscope
Adjust Trigger Level Centering
Check External Triggering
Check line Triggering
Fig. 6-14. Equipment setup to check and adjust sweep circuits, Steps 12 through 20.
Check SAW OUT Signal Amplitude - TM-9-6625-2467-150106
Adjust Center Frequency Range
Fig. 6-19. Test equipment setup to adjust and check dispersion accuracy.
Fig. 6-20, Measuring dispersion accuracy.
Fig. 6-22. Dispersion calibration adjustments.
Fig. 6-23. Test equipment setup to adjust IF amplifier and the resolution bandwidth.
Fig. 6-24. Location of narrow band IF amplifier adjustments.
Fig. 6-27. Location of C504 and C508.
Fig. 6-29. Test equipment setup to adjust and check kHz/DIV dispersion accuracy.
Fig. 6-30. Adjustments for the kHz/DIV discriminator.
Fig. 6-31. Typical displays when checking or adjusting kHz/DIV
Fig. 4-32. Test equipment setup to check or adjust the phase lock circuit.
Fig. 6-33. Adjusting avalanche voltage.
Adjust Band C Balance then Band A and B Balance
Fig. 6-35. Test equipment setup to check dynamic range, IF GAIN control range, IF ATTENUATOR dB accuracy RECORDER signal out amplitude and incidental FM.
Check Dynamic Range of Vertical Display Modes
Fig. 6-36. Typical Video Filter integrated display of 200 MHz RF
Check Incidental Frequency Modulation
Fig. 6-38. Equipment setup to adjust wide band IF amplifier and check flatness.
Fig. 6-39. Wide band IF and Mixer tuning adjustments.
Adjust the Wide Band Amplifier Response and Check the System Response Flatness
Fig. 6-40. Equipment setup to check internal spurious responses.
Adjust Band A Mixer Balance--Check Amplitude of Spurious Signals from Internal Sources
Fig. 6-42. Typical equipment setup to check response flatness, sensitivity, frequency calibration and phase lock operation for band C.
Fig. 6-44. Signal to noise ratio for measuring sensitivity.
Alternate Procedure to Check Dial Accuracy, Oscillator Mixer `Operation and Effectiveness of Local Oscillator Phase Lock
Fig. 6- 45. Alternate equipment setup that will check dial accuracy, mixer and oscillator operation, and LO phase lock effectiveness.
Fig. 6-47. Harmonic frequency markers used to check dial accuracy.
ig. 6-47. Local oscillator assembly showing Voltage and signal connections.
Fig. 6-49. Local oscillator assembly showing drive shaft coupling and tuning adjustments.
Fig. 6-49. Band C Assembly Alignment Diagram.
ALIGNMENT PROCEDURE FOR BAND C OSCILLATOR ASSEMBLY
PARTS LIST ABBREVIATIONS
SPECIAL NOTES AND SYMBOLS
Section 7. ELECTRICAL PARTS LIST - TM-9-6625-2467-150141
Section 7. ELECTRICAL PARTS LIST - TM-9-6625-2467-150142
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150143
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150144
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150145
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150146
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150147
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150148
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150149
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150150
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150151
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150152
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150153
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150154
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150155
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150156
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150157
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150158
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150159
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150160
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150161
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150162
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150163
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150164
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150165
Section 7. ELECTRICAL PARTS LIST - continued - TM-9-6625-2467-150166
FIGURE AND INDEX NUMBERS
INDEX OR MECHANICAL PARTS LIST ILLUSTRATIONS
Section 8. MECHANICAL PARTS LIST
FIG. 1 FRONT (cont) - TM-9-6625-2467-150170
FIG. 1 FRONT (cont) - TM-9-6625-2467-150171
FIG. 1 FRONT (cont) - TM-9-6625-2467-150172
FIG. 2 REAR
FIG. 2 REAR (cont) - TM-9-6625-2467-150174
FIG. 2 REAR (cont) - TM-9-6625-2467-150175
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES - TM-9-6625-2467-150176
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES - TM-9-6625-2467-150177
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES - TM-9-6625-2467-150178
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES (cont) - TM-9-6625-2467-150179
FIG. 1 FRONT (cont) - TM-9-6625-2467-150180
FIG. 3 IF CHASSIS & PHASE LOCK ASSEMBLIES (cont) - TM-9-6625-2467-150181
FIG. 4 POWER CHASSIS - TM-9-6625-2467-150182
FIG. 4 POWER CHASSIS - continued - TM-9-6625-2467-150183
FIG. 4 POWER CHASSIS - continued - TM-9-6625-2467-150184
FIG. 5 TiME/DIV SWITCH & OSCILLATOR ASSEMBLIES - TM-9-6625-2467-150185
FIG. 5 TiME/DIV SWITCH & OSCILLATOR ASSEMBLIES - continued - TM-9-6625-2467-150186
FIG. 5 TiME/DIV SWITCH & OSCILLATOR ASSEMBLIES - continued - TM-9-6625-2467-150187
FIG. 5 TiME/DIV SWITCH & OSCILLATOR ASSEMBLIES - continued - TM-9-6625-2467-150188
FIG. 6 CRT SHIELD ASSEMBLY - TM-9-6625-2467-150189
FIG. 7 CABINET ASSEMBLY AND HANDLE
Appendix A. BASIC ISSUE ITEMS LIST
Appendix B. MAINTENANCE ALLOCATION CHART
Overhaul
Section II. Maintenance Assignment
Appendix C. REPAIR PARTS LIST
Table C-1. Repair Parts List
Section 9. DIAGRAMS MECHANICAL PARTS LIST ILLUSTRATIONS ACCESSORIES
Important
Schematic Correction
Wide Band Amplifier
IF attenuator
Narrow Band Amplifier
Video Detector and Vertical Amplifier
Timing Switch
Power Supply
Power Distribution
CRT and Blanking Circuit - TM-9-6625-2467-150216
Spectrum Analyzer - TM-9-6625-2467-150217
Spectrum Analyzer - TM-9-6625-2467-150218
Spectrum Analyzer - TM-9-6625-2467-150219
FIG. 4 POWER CHASSIS - TM-9-6625-2467-150220
FIG. 5 TIME/DIV SWITCH & OSCILLATOR ASSEMBLIES - TM-9-6625-2467-150221
FIG. 6 CRT SHIELD ASSEMBLY - TM-9-6625-2467-150222
FIG. 7 CABINET ASSEMBLY & HANDLE
FIG. 8 491 STANDARD ACCESSORIES
TM-9-6625-2467-15 - index
