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TM 9-4935-601-14-7&P
TECHNICAL MANUAL
OPERATOR, ORGANIZATIONAL,
DIRECT SUPPORT, AND GENERAL
SUPPORT MAI'NTENANCE MANUAL
(INCLUDING REPAIR PARTS)
FOR
8640B SIGNAL GENERATOR
(INCLUDING OPTION 001)
(PATRIOT AIR DEFENSE GUIDED MISSILE SYSTEM)
HEADQUARTERS, DEPARTMENT OF THE ARMY
SEPTEMBER 1986
TM 9-4935-601-14-7&P
WARNING
DANGEROUS VOLTAGE
is used to operate this equipment
DEATH ON CONTACT
may result if safety precautions are not observed.
Never work on electronic equipment unless there is someone nearby who is familiar with the operation and hazards of
the equipment and is able to give first aid. When the technician is aided by operators, he must warn them about
dangerous areas.
When possible, shut off power to equipment before beginning work on equipment. Ground every capacitor likely to hold
a dangerous potential. When working inside equipment, after the power has been turned off, always ground every part
before touching it.
Be careful not to contact high-voltage connections when installing or operating this equipment.
When possible, keep one hand away from equipment to reduce the hazard of current flowing through the vital organs of
the body.
Read FM 21-11, First Aid for Soldiers, and learn how to administer artificial respiration.
WARNING
Do not be misled by the term "low voltage." Under adverse conditions, potentials as low as 50
volts may cause death.
a/(b blank)
TM 9-4935-601-14-7&P
This material is reproduced through the courtesy of Hewlett-Packard Company. Distribution is limited to use with the
PATRIOT missile system.
TECHNICAL MANUAL ) HEADQUARTERS
) DEPARTMENT OF THE ARMY
No. 9-1430-601-14-7&P ) Washington, D.C.,10 September 1986
Operator, Organizational, and DS/GS Maintenance Manual
(INCLUDING REPAIR PARTS)
FOR
8640B SIGNAL GENERATOR
(Including Option 001)
(PATRIOT AIR DEFENSE GUIDED MISSILE SYSTEM)
This manual applies directly to instruments with serial numbers prefixed 1324A.
With changes described in Section VII, this manual also applies to instruments with serial numbers
prefixed 1229A, 1244A, 1245A, 1246A, 1249A, 1251A, 1303A, 1310A, 1313A, 1316A, 1322A, 1323A,
1327A, 1332A, 1333A, 1339A, 1342A, 1345A, 1350A, 1401A, 1404A, 1404A, 1405A, 1406A, 1416A,
1419A, 1423A, 1429A, 1431A, 1435A, 1438A, 1440A, 1442A, 1501A, 1506A, 1513A, 1515A, 1519A,
1520A, 1524A, 1526A, 1530A, 1532A, 1534A, 1535A, 1538A, 1542A, 1543A, 1544A, 1545A, and
1552A.
For additional important information about serial numbers see INSTRUMENTS COVERED BY
MANUAL in Section I.
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes, or if you find a way to improve the
procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to
Publications and Blank Forms), or DA Form 2028-2 direct to: Commander, U.S. Army Missile
Command, ATTN: AMSMILC-ME-PM, Redstone Arsenal, Alabama 35898-5238. A reply will be
furnished to you.
i
TM 9-4935-601-14-7&P
CONTENTS
Section Page
Section 0 General
0-1 Maintenance Forms and Records .................................................. 0-1
0-2 Reporting Equipment Improvement Recommendations
(EIR) ......................................................................................... 0-1
0-3 Administrative Storage ................................................................... 0-1
0-4 Destruction of Army Material to Prevent Enemy
Use ........................................................................................... 0-1
Section I General Information
1-1 Introduction ................................................................................... 1-1
1-7 Instrument Covered by Manual ...................................................... 1-1
1-12 General Description ....................................................................... 1-2
1-17 Performance Characteristics ......................................................... 1-2
1-18 Spectral Purity .......................................................................... 1-2
1-24 Frequency Counter ................................................................... 1-3
1-29 Phase-Lock Mode ..................................................................... 1-3
1-35 Amplitude Modulation ............................................................... 1-4
1-38 Pulse Modulation ...................................................................... 1-4
1-41 Frequency Modulation .............................................................. 1-4
1-44 Standard and Optional Audio Oscillators ................................... 1-5
1-47 Multi-function Meter and Annunciators ...................................... 1-5
1-53 Output Level ............................................................................. 1-5
1-57 Options ......................................................................................... 1-6
1-62 Accessories Supplied .................................................................... 1-6
1-65 Equipment Available ..................................................................... 1-6
1-72 Warranty ....................................................................................... 1-7
1-74 Test Equipment Required .............................................................. 1-7
Section II Installation
2-1 Introduction ................................................................................... 2-1
2-3 Initial Inspection ............................................................................ 2-1
2-5 Preparation for Use ....................................................................... 2-1
2-6 Power Requirements ................................................................ 2-1
2-8 Line Voltage Selection .............................................................. 2-2
2-11 Power Cable ............................................................................. 2-2
2-13 Mating Connectors .................................................................... 2-3
2-15 Operating Environment ............................................................. 2-3
2-18 Bench Operation ....................................................................... 2-3
2-20 Rack Mounting ......................................................................... 2-3
2-22 Storage and Shipment ................................................................... 2-3
ii
TM 9-4935-601-14-7&P
CONTENTS (Continued)
Section Page
2-23 Environment .................................................................................. 2-3
2-25 Packaging ...................................................................................... 2-3
Section III Operation
3-1 Introduction .................................................................................... 3-1
3-3 Panel Features............................................................................... 3-1
3-5 Operator's Checks.......................................................................... 3-1
3-7 Operating Instructions .................................................................... 3-1
3-9 Operator's Maintenance ................................................................. 3-1
Section IV Performance Tests
4-1 Introduction .................................................................................... 4-1
4-3 Equipment Required....................................................................... 4-1
4-5 Test Record ................................................................................... 4-1
4-7 Test Procedures ............................................................................. 4-1
4-11 Frequency Range Test ................................................................... 4-2
4-12 Frequency Accuracy and Fine Tune Test ...................................... 4-3
4-13 Frequency Stability vs Time and Restabilization
Time Test ................................................................................. 4-5
4-14 Frequency Stability vs Temperature Test ...................................... 4-7
4-15 Frequency Stability vs Line Voltage Test ....................................... 4-8
4-16 Frequency Stability vs Load, Level, and
Mode Test ................................................................................ 4-9
4-17 Harmonics Test .............................................................................. 4-11
4-18 Sub-Harmonics and Non-Harmonic Spurious
Test .......................................................................................... 4-13
4-19 Single Sideband Phase Noise Test ................................................ 4-15
4-20 Single Sideband Broadband Noise Floor Test ................................ 4-17
4-21 Residual AM Test........................................................................... 4-20
4-22 Residual FM Test ........................................................................... 4-21
4-23 Output Level Accuracy Test (Abbreviated) ..................................... 4-24
4-24 Output Level Flatness Test ............................................................ 4-29
4-25 Output Level Flatness Test ............................................................ 4-36
4-26 Output Impedance Test (In Band) .................................................. 4-37
4-27 Output Impedance Test (Out of Band) ........................................... 4-39
4-28 Auxiliary Output Test...................................................................... 4-41
4-29 Output Leakage Test...................................................................... 4-42
4-30 Internal Modulation Oscillator Test ................................................ 4-44
4-31 Internal Modulation Oscillator Distortion
Test (Option 001) ...................................................................... 4-45
4-32 AM 3 dB Bandwidth Test ................................................................ 4-47
iii
TM 9-4935-601-14-7&P
CONTENTS (Continued)
Section Page
4-33 AM Distortion Test ......................................................................... 4-49
4-34 AM Sensitivity and Accuracy Test. ............................................... 4-50
4-35 Peak Incidental Phase Modulation Test ......................................... 4-54
4-36 Pulse Modulation Test ................................................................... 4-56
4-37 Pulse On/Off Ratio Test ................................................................ 4-60
4-38 FM 3 dB Bandwidth Test ............................................................... 4-61
4-39 FM Distortion Test ......................................................................... 4-62
4-40 FM Sensitivity and Accuracy Test ................................................. 4-64
4-41 Incidental AM Test ........................................................................ 4-68
4-42 Counter External Sensitivity Test .................................................. 4-70
4-43 Internal Reference Accuracy Test .................................................. 4-71
4-44 Internal Reference Drift Rate (Stability)
Test .......................................................................................... 4-72
4-45 Phase Lock Restabilization Time Test ........................................... 4-75
Section V Adjustments
5-1 Introduction ................................................................................... 5-1
5-3 Safety Considerations ................................................................... 5-1
5-9 Test Equipment Required .............................................................. 5-1
5-11 Pozidriv Screwdrivers ............................................................... 5-1
5-13 Blade Tuning Tools ................................................................... 5-1
5-15 Service Aids ............................................................................. 5-1
5-19 Factory Selected Components ...................................................... 5-2
5-22 Post-Repair Test and Adjustments ................................................ 5-3
5-25 Power Supply Adjustments ............................................................ 5-8
5-26 Fixed-Frequency Modulation Oscillator
Adjustment ................................................................................ 5-8
5-27 Variable-Frequency Modulation Oscillator
Adjustment (Option 001) ........................................................... 5-9
5-28 Meter Adjustments ........................................................................ 5-12
5-29 RF Detector Offset Adjustment ...................................................... 5-12
5-30 Output Level Knob Adjustment ...................................................... 5-13
5-31 Output Level Vernier and Meter Adjustment ................................... 5-14
5-32 AM Sensitivity Adjustment ............................................................. 5-17
5-33 Peak Deviation and Range Switch Adjustment ............................... 5-19
5-34 Range Switch Adjustment ............................................................. 5-20
5-35 VT Pot (A3R1) Adjustment ............................................................ 5-21
5-36 VT Voltage Adjustment .................................................................. 5-22
5-37 RF Filter Adjustment ..................................................................... 5-23
5-38 Preliminary FM Adjustments ......................................................... 5-27
5-39 FM Linearity Adjustment ................................................................ 5-29
iv
TM 9-4935-601-14-7&P
CONTENTS (Continued)
Section Page
5-40 FM Sensitivity Adjustment ............................................................. 5-32
5-41 Internal Reference Frequency Adjustment...................................... 5-34
5-42 RF Oscillator End Stop Adjustment ............................................... 5-36
5-43 RF Oscillator Output Power Adjustment ......................................... 5-38
5-44 FM Linearity Adjustment (Alternate) .............................................. 5-40
Section VI Replaceable Parts
6-1 Introduction .................................................................................... 6-1
6-3 Exchange Assemblies .................................................................... 6-1
6-5 Abbreviations ................................................................................. 6-1
6-7 Replaceable Parts List.................................................................... 6-1
6-11 Ordering Information ...................................................................... 6-1
6-14 Spare Parts Kit............................................................................... 6-1
6-16 Illustrated Parts Breakdowns ......................................................... 6-2
Section VII Manual Changes
7-1 Introduction .................................................................................... 7-1
7-3 Manual Changes ............................................................................ 7-1
7-6 Manual Change Instructions .......................................................... 7-4
7-7 Instrument Improvement Modifications .......................................... 7-78
7-9 Improved FM Metering Accuracy (Serial
Prefix 1229A) ....................................................................... 7-78
7-11 Elimination of Frequency Shift in Expand
X100 Mode (Serial Prefix 1229A) ......................................... 7-78
7-14 A8A2 Counter/Lock Board Assembly
Improvements (Serial Prefix 1229A) .................................... 7-78
7-16 Improved Audio Output Level Accuracy
(Serial Prefix 1229A) ............................................................ 7-80
7-18 A26A1 Power Amplifier and AGC Detector
Assembly Improvement (Serial Prefix 1229A)....................... 7-80
7-20 Reduction of RFI Leakage from Front Panel
(Serial Prefix 1244A and Below) .......................................... 7-80
7-23 A26A4 AGC Amplifier Assembly Improvement
(Serial Prefix 1245A and Below) .......................................... 7-81
7-26 Reduction of RFI Leakage from RF Oscillator
(Serial Prefix 1246A and Below) .......................................... 7-81
7-28 Replacement A7 FM Shaping Assembly (Serial
Prefix 1246A and Below) ...................................................... 7-81
7-31 Replacement A9 Peak Deviation and Range
Switch Assembly (Serial Prefix 1246A and
Below) ................................................................................. 7-81
v
TM 9-4935-601-14-7&P
CONTENTS (Continued)
Section Page
7-34 A10A1 RF Filter Assembly Switch Improvement
(Serial Prefix 1246A and Below) ............................................... 7-83
7-36 A8A1 RF Scaler Assembly Improvement (Serial
Prefix 1249A) ........................................................................... 7-83
7-38 A5 FM Amplifier Assembly Improvement (Serial
Prefix 125lA and Below) ........................................................... 7-83
7-40 A8A2 Counter/Lock Board Assembly Improvement
(Serial Prefix 1251A and Below) ............................................... 7-83
7-42 Front Panel Meter M1 Replacement (Serial
Prefix 125lA and Below) ........................................................... 7-83
7-44 A26 AM/AGC and RF Amplifier Assembly
Improvement ............................................................................ 7-84
7-46 A26A4 AGC Amplifier Assembly Improvement
(Serial Prefix 1310A and Below) ............................................... 7-84
7-48 A10A2 RF Divider Assembly Improvement (Serial
Prefix 1313A and Below) .......................................................... 7-85
7-50 Power Supply Improvement (Serial Prefix 1313A
and Below) ............................................................................... 7-86
7-52 A10A2 RF Divider Assembly Improvement (Serial
Numbers 1316A00464 and Below) ............................................ 7-86
7-54 Improved Audio Output Level Flatness (Serial
Prefixes 1244A through 1316A) ................................................ 7-86
7-56 A8A4 Counter Display Assembly Improvement
(Serial Prefixes 1323A and Below) ........................................... 7-86
7-58 Improved FM Bandwidth on 5kHz Deviation Range
(Serial Number Prefixes 1323A and 1327A................................ 7-86
7-60 Improved Noise Performance (Serial Prefixes
1327A and Below) .................................................................... 7-86
7-62 A10A2 RF Divider Assembly Improvement (Serial
Number Prefixes 1333A and Below) ......................................... 7-86
7-64 A18, A20, and A22 Power Supply Regulator
Improvements (Serial Number Prefixes 133A
and Below). ............................................................................. 7-87
7-66 Time Base Vernier and Pot Replacement (Serial
Prefix 1333A and Below) .......................................................... 7-87
7-70 All Variable Frequency Modulation Oscillator
Improvements (Serial Number Prefixes
1339A and Below) .................................................................... 7-87
7-73 A12 Rectifier Assembly Input Crowbar Failures
(Serial Number Prefixes 1330A and Below) .............................. 7-87
7-75 Reliability Improvements in AM and Pulse
Circuits (Serial Number Prefixes 1345A
and Below) ................................................................................ 7-88
vi
TM 9-4935-601-14-7&P
CONTENTS (Continued)
Section Page
7-78 All Variable Frequency Modulation Oscillator
(Option 001) Improvement (Serial Number
Prefixes 1350A and Below) ....................................................... 7-88
7-81 Improvement in Lock Acquisition Capability
(Serial Number Prefixes 1350A and Below) ............................... 7-88
7-83 +44.6V Regulator Improvement (Serial Number
Prefixes 1405A and Below) ....................................................... 7-88
7-85 Line Switch Modification (Serial Number
Prefixes 1406A and Below) ....................................................... 7-88
7-88 Reduction in Popcorn Noise on Power Supplies
(Serial Number Prefixes 1406A and Below) .............................. 7-89
7-90 Recommended Fuse Replacement for 110/240V
Operation (Serial Number Prefixes 1423A
and Below) ............................................................................... 7-89
7-93 "REDUCE PEAK POWER" Lamp Drive Modification
(Serial Number Prefix 1526A and Below)................................... 7-89
Section VII Service
8-1 Introduction ................................................................................... 8-1
8-5 Principles of Operation .................................................................. 8-1
8-8 Troubleshooting ............................................................................ 8-1
8-12 Recommended Test Equipment ..................................................... 8-1
8-14 Service Aids .................................................................................. 8-1
8-23 Repair ........................................................................................... 8-3
8-24 Factory Selected Components .................................................. 8-3
8-26 Etched Circuits ......................................................................... 8-3
8-28 Etched Conductor Repair .......................................................... 8-3
8-30 Component Replacement ......................................................... 8-3
8-37 Illustrated Parts Breakdowns ..................................................... 8-5
8-39 Basic Circuit Theory ...................................................................... 8-5
8-40 Binary Circuits and Symbols ..................................................... 8-5
8-52 Binary Registers ....................................................................... 8-8
8-53 Binary Latch .............................................................................. 8-8
8-57 Binary Shift Register ................................................................. 8-8
8-61 Decade Counters and Symbols ................................................. 8-9
8-69 Linear Integrated Circuits .......................................................... 8-11
vii
TM 9-4935-601-14-7&P
TABLES
Table Page
1-1 Specifications ................................................................................ 1-8
1-2 Recommended Test Equipment .................................................... 1-13
1-3 Recommended Test Accessories .................................................. 1-20
4-1 Performance Test Record ............................................................. 4-77
4-2 Recommended Test Abridgements ............................................... 4-85
5-1 Factory Selected Components ...................................................... 5-2
5-2 Post-Repair Test and Adjustments ................................................ 5-4
5-3 RF Filter Check ............................................................................. 5-26
6-1 Part Numbers for Exchange Assemblies ....................................... 6-2
6-2 Reference Designations and Abbreviations ................................... 6-3
6-3 Replaceable Parts ......................................................................... 6-5
6-4 Code List of Manufacturers ........................................................... 6-42
7-1 Manual Changes by Serial Number ............................................... 7-1
7-2 Summary of Changes by Component ............................................ 7-2
8-1 Etched Circuit Soldering Equipment .............................................. 8-4
8-2 Logic Levels .................................................................................. 8-6
8-3 Assembly Information Index .......................................................... 8-14
8-4 Schematic Diagram Notes ............................................................. 8-15
8-5 Meter Drive Amplifier Data ............................................................ 8-52
8-6 Total Count of Time Base Reference Counters U13,
U14, and U15 ........................................................................... 8-56
8-7 Count Modes of Counters A8A3U13 and U14 ................................ 8-56
8-8 Count Modes of Counter A8A3U15 ................................................ 8-56
8-9 Data Inputs of Decimal Point Shift Register ................................... 8-56
ILLUSTRATIONS
Figure Page
1-1 HP Model 8640B Signal Generator (Option 001) and
Accessories Supplied ................................................................ 1-0
1-2 Measured Single Sideband Noise vs Offset from Carrier................ 1-2
1-3 Specified Signal-to-Phase Noise Ratio .......................................... 1-3
1-4 AM Distortion vs AM Rate ............................................................. 1-4
1-5 Pulsed RF ..................................................................................... 1-4
1-6 FM Distortion vs FM Rate .............................................................. 1-5
1-7 520 MHz Notch Filter .................................................................... 1-21
1-8 FM Linearity Circuit ....................................................................... 1-22
2-1 Line Selector ................................................................................. 2-1
2-2 Power Cables Available ................................................................ 2-2
2-3 Preparation for Rack Mounting ...................................................... 2-4
viii
TM 9-4935-601-14-7&P
ILLUSTRATIONS (Continued)
Figure Page
3-1 Lamp Replacement ....................................................................... 3-1
3-2 Front Panel Controls, Indicators, and Connectors .......................... 3-2
3-3 Rear Panel Controls, and Connectors ............................................ 3-6
3-4 Operator's Checks ......................................................................... 3-7
3-5 Setting the Frequency and Amplitude Controls .............................. 3-12
3-6 Setting the Modulation Controls ..................................................... 3-15
4-1 Frequency Stability vs Time and Restabilization Time
Test Setup................................................................................. 4-5
4-2 Frequency Stability vs Temperature Test Setup ............................ 4-7
4-3 Frequency Stability vs Line Voltage Test Setup ............................. 4-8
4-4 Frequency Stability vs Load, Level, and Mode Test
Setup......................................................................................... 4-10
4-5 Sub-flarrmonics and Non-Harmonic Spurious Test Setup .............. 4-14
4-6 Single Sideband Phase Noise Test Setup ...................................... 4-15
4-7 Single Sideband Broadband Noise Floor Test Setup ..................... 4-18
4-8 Residual AM Test Setup ................................................................ 4-20
4-10 Output Level Accuracy Test Setup (Abbreviated) .......................... 4-25
4-11 Output Level Accuracy Test Setup (Complete) .............................. 4-31
4-12 Output Level Flatness Test Setup ................................................. 4-36
4-13 Output Impedance Test Setup (In Band) ....................................... 4-38
4-14 Output Impedance Test Setup (Out of Band) ................................. 4-40
4-15 Output Leakage Test Setup ........................................................... 4-42
4-16 Internal Modulation Oscillator Test Setup ...................................... 4-44
4-17 Internal Modulation Oscillator Distortion Test
Setup. ...................................................................................... 4-46
4-18 AM 3 dB Bandwidth Test Setup ..................................................... 4-47
4-19 AM Distortion Test Setup ............................................................... 4-49
4-20 AM Sensitivity and Accuracy Test Setup ....................................... 4-51
4-21 Peak Incidental Phase Modulation Test Setup ............................... 4-54
4-22 Pulse Modulation Test Setup ......................................................... 4-57
4-23 Pulse Measurements ..................................................................... 4-58
4-24 FM 3 dB Bandwidth Test Setup ..................................................... 4-61
4-25 FM Distortion Test Setup ............................................................... 4-63
4-26 FM Sensitivity and Accuracy Test Setup ....................................... 4-65
4-27 Incidental AM Test Setup .............................................................. 4-68
4-28 Counter External Sensitivity Test Setup ........................................ 4-70
4-29 Internal Reference Accuracy Test Setup ....................................... 4-71
4-30 Internal Reference Drift Rate (Stability) Test Setup ........................ 4-73
5-1 Output Level Vernier and Meter Adjustment Test Setup ................. 5-15
5-2 AM Sensitivity Adjustment Test Setup ........................................... 5-17
5-3 VT Pot Adjustment ........................................................................ 5-21
5-4 Filter Terminology .......................................................................... 5-23
5-5 RF Filter Adjustment Test Setup ................................................... 5-24
ix
TM 9-4935-601-14-7&P
ILLUSTRATIONS (Continued)
Figure Page
5-6 256-512 MHz High Band Capacitor Adjustment
Orientation................................................................................. 5-27
5-7 DM Linearity Adjustment Test Setup ............................................. 5-30
5-8 FM Linearity Display ...................................................................... 5-32
5-9 FM Sensitivity Adjustment Test Setup ........................................... 5-33
5-10 Internal Reference Frequency Adjustment Test Setup.................... 5-35
5-11 Location of RF Oscillator Stop Adjustments Shown
in Maximum ccw Position. Top View with Instrument
Upside Down ............................................................................ 5-37
5-12 RF Oscillator Output Power Adjustment Test Setup ...................... 5-38
5-13 FM Linearity Adjustment (Alternate) Test Setup ............................ 5-40
6-1 Cabinet Parts ................................................................................. 6-40
6-2 Type N Connector ......................................................................... 6-41
7-1 A8A2 Counter/Lock Board Assembly Backdating
(Change B) ................................................................................ 7-12
7-2 A3A4 Connector Board Assembly Backdating (Change C) ............ 7-13
7-3 A26A1 Power Amplifier and AGC Detector Assembly
Backdating (Change D) ............................................................. 7-14
7-4 A26A2U1 Backdating (Change E) .................................................. 7-17
7-5 A8A1 RF Scaler Assembly Backdating (Change E) ....................... 7-18
7-6 A12 Rectifier Assembly Backdating (Change F) ............................. 7-19
7-7 A8A1 Scaler Assembly Backdating (Change J) .............................. 7-22
7-8 A8A4 Counter Display Assembly Modification ............................... 7-79
7-9 A7 FM Shaping Assembly Modification .......................................... 7-82
7-10 A9 Peak Deviation and Range Switch Modification ....................... 7-23
7-11 AlOA2 RF Divider Assembly Modification ...................................... 7-26
8-1 Signal Generator with Circuit Boards on Extenders ....................... 8-2
8-2 Examples of Diode and Transistor Marking Methods ..................... 8-4
8-3 Binary Symbols ............................................................................. 8-6
8-4 Triggered Flip-Flop......................................................................... 8-7
8-5 D Flip-Flop .................................................................................... 8-7
8-6 Schmitt Trigger .............................................................................. 8-7
8-7 JIK Flip-Flop................................................................................... 8-8
8-8 Multiple Input J/K Flip-Flop ............................................................ 8-8
8-9 Binary Latch .................................................................................. 8-9
8-10 Binary Shift Register ..................................................................... 8-9
8-11 Basic Decade Counter (Scaler) ..................................................... 8-9
8-12 Programmable Counter ................................................................. 8-10
8-13 Programmable Up/Down Counter .................................................. 8-12
8-14 Operational Amplifier .................................................................... 8-13
8-15 Comparator ................................................................................... 8-14
8-16 Overall Block Diagram .................................................................. 8-19
x
TM 9-4935-601-14-7&P
ILLUSTRATIONS (Continued)
Figure Page
8-17 FM Circuits and RF Oscillator Block Diagram ................................ 8-21
8-18 AM/AGC Circuits and Output Amplifier Block Diagram .................. 8-23
8-19 Counter/Lock Circuits Block Diagram ............................................ 8-25
8-20 P/O A3A4 Connector Board Assembly Component
Location..................................................................................... 8-27
8-21 RF Oscillator Simplified Diagram .................................................. 8-27
8-22 P/O A3A4 Connector Board Assembly Component
Locations................................................................................... 8-28
8-23 P/O A9 Peak Deviation and Range Switch Assembly
Component Locations ............................................................... 8-28
8-24 A5 FM Amplifier Assembly Component Locations ......................... 8-29
8-25 FM Amplifiers Schematic Diagram ................................................ 8-29
8-26 P/O A7 FM Shaping Assembly Component Locations ................... 8-31
8-27 FM Shaping Circuits and Phase Lock Loop Filter
Schematic Diagram .................................................................. 8-31
8-28 P/O A6 Annunciator Assembly Component Locations .................... 8-32
8-29 P/O A9 Peak Deviation and Range Switch Assembly
Component Locations ............................................................... 8-32
8-30 P/O A7 FM Shaping Assembly Component Locations ................... 8-33
8-31 Over-Deviation Detector and Meter Control Circuits
Schematic Diagram .................................................................. 8-33
8-32 All Fixed-Frequency Modulation Oscillator Assembly
Component Locations ............................................................... 8-35
8-33 Fixed-Frequency Modulation Oscillator Schematic
Diagram ................................................................................... 8-35
8-34 All Variable-Frequency Modulation Oscillator Assembly
(Option 001) Component Locations .......................................... 8-37
8-35 Variable-Frequency Modulation Oscillator (Option 001)
Schematic Diagram ................................................................... 8-37
8-36 A10A1 RF Filter Assembly Component Locations ......................... 8-38
8-37 RF Filters Schematic Diagram ...................................................... 8-39
8-38 A10A2 RF Divider Assembly Component Locations ...................... 8-41
8-39 RF Dividers Schematic Diagram ................................................... 8-41
8-40 A26A3 Modulator Assembly Component Locations ........................ 8-43
8-41 A26A4 AGC Amplifier Assembly Component Locations ................. 8-43
8-42 AGC Amplifiers and Amplitude Modulator Schematic
Diagram ........................................................................................ 8-43
8-43 A26A1 Power Amplifier and AGC Detector Assembly
Component Locations .................................................................... 8-45
8-44 P/O A26A2 AM Offset and Pulse Switching Assembly
Component Locations .................................................................... 8-45
8-45 RF Amplifier, Pulse Switching, and Step Attenuator
Schematic Diagram ....................................................................... 8-45
xi
TM 9-4935-601-14-7&P
ILLUSTRATIONS (Continued)
Figure Page
8-46 P/O A26A2 AM Offset and Pulse Switching Assembly
Component Locations ............................................................... 8-47
8-47 AM Preamplifier Schematic Diagram ............................................. 8-47
8-48 AM Interconnections and RF ON/OFF Switch Schematic
Diagram .................................................................................... 8-49
8-49 AlA1 RF Vernier Assembly Component Locations ......................... 8-51
8-50 RF Vernier Schematic Diagram ..................................................... 8-51
8-51 A2 Meter Switch/Detector Assembly Component
Location..................................................................................... 8-52
8-52 A4 Meter/Annunciator Drive Assembly .......................................... 8-53
8-53 P/O A6 Annunciator Assembly Component Location ..................... 8-53
8-54 Meter Circuits Schematic Diagram ................................................ 8-53
8-55 A8A1 RF Scaler Assembly Component Locations ......................... 8-55
8-56 P/O A8A3 Time Base Assembly Component Locations .................. 8-55
8-57 Counter RF Scaler Schematic Diagram ......................................... 8-55
8-58 P/O A8A3 Time Base Assembly Component Locations ................. 8-57
8-59 Counter Time Base Schematic Diagram ........................................ 8-57
8-60 A8A4 Counter Display Assembly Component Locations
(P/O A8) ................................................................................... 8-59
8-61 P/O A8A2 Counter/Lock Board Assembly Component
Locations. ................................................................................ 8-59
8-62 Up/Down Counter and Display Schematic Diagram ....................... 8-59
8-63 P/O A8A2 Counter/Lock Board Assembly Component
Locations. ................................................................................ 8-61
8-64 Counter Phase Lock Circuits Schematic Diagram .......................... 8-61
8-65 Current Foldback............................................................................ 8-62
8-66 A12 Rectifier Assembly Component Locations .............................. 8-62
8-67 A20 +5.2V and +44.6V Regulator Assembly Component
Locations .................................................................................. 8-63
8-68 A22 +20V and -20V Regulator Assembly Component
Locations. ................................................................................ 8-63
8-69 Power Supply Circuits Schematic Diagram .................................... 8-63
8-70 A18 -5.2V Regulator and Fan Driver Assembly Component
Locations .................................................................................. 8-65
8-71 A18 -5.2V Regulator and Fan Circuits Schematic
Diagram ................................................................................... 8-65
8-72 A17 Power Supply Mother Board Assembly Component
Locations................................................................................... 8-67
8-73 Power Supply Mother Board Schematic Diagram .......................... 8-67
8-74 A13 Modulation/Metering Mother Board Assembly
Component Locations ............................................................... 8-68
xii
TM 9-4935-601-14-7&P
ILLUSTRATIONS (Continued)
Figure Page
8-75 Modulation/Metering Mother Board Schematic Diagram ................. 8-69
8-76 A1 Output Level Assembly Illustrated Parts Breakdown.................. 8-71
8-77 A8 Counter/Lock Assembly Illustrated Parts Breakdown................. 8-73
8-78 A9 Peak Deviation and Range Switch Assembly
Illustrated Parts Breakdown ...................................................... 8-75
8-79 A11 Variable-Frequency Modulation Oscillator (Option
991) Illustrated Parts Breakdown .............................................. 8-75
8-80 A10 Divider/Filter Assembly Illustrated Parts
Breakdown ............................................................................... 8-77
8-81 A26 AM/AGC and RF Amplifier Illustrated Parts
Breakdown ............................................................................... 8-79
8-82 Top Internal Views (Option 001 shown) ......................................... 8-81
8-83 Rear Panel View ........................................................................... 8-83
8-84 Bottom Internal Views (Option 001 shown) .................................... 8-83
SERVICE SHEETS
Number Page
1 Overall Block Diagram .................................................................. 8-18
2 FM Circuits and RF Oscillator Troubleshooting .............................. 8-20
3 AM/AGC Circuits and Output Amplifier Troubleshooting................. 8-22
4 Counter/Lock Circuits Troubleshooting .......................................... 8-24
5 RF Oscillator (A3) .......................................................................... 8-26
6 FM Amplifiers (A3, A5, A9, A13) ................................................... 8-28
7 FM Shaping Circuits and Phase Lock Loop Filter
(A7, A9) .................................................................................... 8-30
8 Over-Deviation Detector and Meter Control Circuits
(A6, A7, A9)............................................................................... 8-32
9 Fixed-Frequency Modulation Oscillator (All, A13) .......................... 8-34
9A Variable-Frequency Modulation Oscillator for Option
001 (A11, A13) ......................................................................... 8-36
10 RF Filters (A10Al) ......................................................................... 8-38
11 RF Dividers (A10A2) ..................................................................... 8-40
12 AGC Amplifiers and Amplitude Modulator (A26A3,
A26A4) ...................................................................................... 8-42
13 RF Amplifier, Pulse Switching, and Step Attenuator
(A1, A26A1, A26A2) ................................................................. 8-44
14 AM Preamplifier (A13, A26A2) ...................................................... 8-46
15 AM Interconnections and RF ON/OFF Switch (A9, A26) ................ 8-48
16 RF Vernier (A1A1, A26) ................................................................ 8-50
xiii
TM 9-4935-601-14-7&P
SERVICE SHEETS
Number Page
17 Meter Circuits (A2, A4, A6) ............................................................ 8-52
18 Counter RF Scaler (A8A1, A8A3) .................................................. 8-54
19 Counter Time Base (A8A3, A9) ..................................................... 8-56
20 Up/Down Counter and Display (A8A2, A8A4) ................................ 8-58
21 Counter Phase Lock Circuits (A8A2) ............................................. 8-60
22 Power Supply Circuits (A12, A14, A20, A22) ................................. 8-62
23 -5.2V Regulator and Fan Circuits (A16, A18) ................................. 8-64
24 Power Supply Mother Board (A17) ................................................ 8-67
25 Modulation/Metering Mother Board (A13) ...................................... 8-68
A Al Assembly Removal and Disassembly ........................................ 8-70
B A8 Assembly Removal and Disassembly ....................................... 8-72
C A9 and All Assemblies Removal and Disassembly ........................ 8-74
D A10 Assembly Removal and Disassembly ..................................... 8-76
E A26 Assembly Removal and Disassembly ..................................... 8-78
F General Removal Procedures and Top Internal Views.................... 8-80
G Rear Panel and Bottom Internal Views .......................................... 8-83
xiv
Model 8640B TM 9-4935-601-14-7&P
WARNINGS
SAFETY CAUTIONS
To avoid the possibility of injury or death, the following GROUNDING
precautions must be followed before the instrument is Any interruption of the protective (grounding) conductor
switched on: inside or outside the instrument is likely to cause
damage to the instrument. To avoid damage, this
a. If this instrument is to be energized via an instrument and all line powered devices connected to it
autotransformer for voltage reduction, make sure that must be connected to the same earth ground (see
the common terminal is connected to the earth Section II).
grounded pole of the power source.
b. The power cable plug shall only be inserted into LINE VOLTAGE
a socket outlet provided with a protective earth contact. Be sure to select the correct fuse rating for the selected
The protective action must not be negated by the use of line voltage (see LINE VOLTAGE SELECTION in
an extension cord without a protective conductor Section II); fuse ratings are listed on the fuse
(grounding). compartment.
c. Before switching on the instrument, the
protective earth terminal of the instrument must be To prevent damage to the instrument, make the line
connected to a protective conductor of the power cord. voltage selection before connecting line power. Also
This is accomplished by ensuring that the instrument's ensure that the line power cord is connected to a line
internal earth terminal is correctly connected to the power socket that is provided with a protective earth
instrument's chassis and that the power cord is wired contact.
correctly (see Service Sheet 22).
SAFETY
Whenever it is likely that the protection has been To avoid the-possibility of damage to test equipment,
impaired, the instrument must be made inoperative and read completely through each test before starting it.
be secured against any unintended operation. Make any preliminary control settings necessary for
correct test equipment operation.
Any interruption of the protective (grounding) conductor
inside or outside the instrument or disconnection of the COUNTER INPUT
protective earth terminal is likely to make the instrument Do not apply a dc voltage or >+15 dBm to COUNTER
dangerous. Intentional interruption is prohibited. INPUT.
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