HP 86720A User manual

The test & measurement
equipment you need at
the price you want.
Alltest carries the world’s largest selection of
used/refurbished benchtop test & measurement
equipment at 50% the price of new.
O
Our equipment is guaranteed working, warrantied, and
available with certified calibration from our in-house staff
of technicians and engineers.
• 10+ full time technicians with over 150 years of
specialization
• 90 day warranty & 5 day right of return on all
equipment
•
• 1-3 year warranties for new and
premium-refurbished equipment
• Every unit tested to OEM specifications
• Satisfaction guaranteed
You have plans, we will help you achieve them.
Any project. Any budget.
Get a quote today!
CCall [phone] or email [e-mail].
t
Alltest Instruments, Inc.
500 Central Ave.
Farmingdale, NJ 07727
P: [phone]
F: [phone]
alltest.net
s
[e-mail]

Errata
Title & Document Type:
Manual Part Number:
Revision Date:
HP References in this Manual
This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-
Packard's former test and measurement, semiconductor products and chemical analysis
businesses are now part of Agilent Technologies. We have made no changes to this
manual copy. The HP XXXX referred to in this document is now the Agilent XXXX.
For example, model number HP8648A is now model number Agilent 8648A.
About this Manual
We’ve added this manual to the Agilent website in an effort to help you support your
product. This manual provides the best information we could find. It may be incomplete
or contain dated information, and the scan quality may not be ideal. If we find a better
copy in the future, we will add it to the Agilent website.
Support for Your Product
Agilent no longer sells or supports this product. You will find any other available
product information on the Agilent Test & Measurement website:
www.tm.agilent.com
Search for the model number of this product, and the resulting product page will guide
you to any available information. Our service centers may be able to perform calibration
if no repair parts are needed, but no other support from Agilent is available.
8672A Synthesized Signal Generator Operating and Service Manual
08672-90086
September 1987

OPERATING AND SERVICE MANUAL-
HP 8672A
SYNTHESIZEDSIGNAL GENERATOR
(Including Options
001,002,003,
004,005,034, and 038)
SERIAL NUMBERS
This manual applies directly to instruments with
serial numbers prefixed 2229A.
With changes described in Section VII, this man¬
ual also applies to instruments with serial num¬
bers prefixed 1610A, 1701A thru 1708A, 1711A,
1712A, 1719A, 1725A, 1731A thru 1733A, 1801A,
1816A, 1821A, 1822A, 1831A, 1833A, 1834A,
1841A, 1845A, 1905A, 1906A, 1913A, 1914A,
1930A, 1940A, 2002A, 2005A thru 2008A, 2010A,
2012A, 2014A, 2016A, 2017A, 2018A, 2019A,
2020A, 2034A, 2037A, 2039A, 2040A, 2101A,
2102A, 2103A, 2104A, 2105A, 2114A, 2115A,
2126A, 2132A, 2133A, 2207A, 2208A, 2210A,
2211A, 2220A, and 2221A.
For additional important information about serial
numbers, see INSTRUMENTS COVERED BY
MANUAL in Section I.
HEWLETT
PACKARD
© Copyright HEWLETT-PACKARD COMPANY 1977, 1978,1980,1983
1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA, U.S.A.
OPERATING AND SERVICE MANUAL PART NO. 08672-90086
Operating Manual Part No. 08672-90087
Operating and Service Microfiche Part No. 08672-90088 Printed: September 1987

Contents Model 8672A
CONTENTS
Section
I GENERAL INFORMATION . .
1-1. Introduction .............
1-7. Specifications ............
1-9. Safety Considerations .......
1-13. Instruments Covered by Manual
1-17. Manual Change Supplements . . .
1-20. Description ..............
1-22.
1-25.
1-28.
1-32.
Frequency .................
Output Level ...............
Modulation Modes ...........
Miscellaneous Outputs and
Indicators ...............
1-37. Remote Operation ...........
1-40. Options ....................
1-41. Electrical Options ............
1-47. Mechanical Options ...........
1-53. Compatibility ................
1-56. Selecting the HP-IB Address .......
1-58. Accessories supplied ............
1-60. Equipment Required but Not Supplied
1-64. Equipment Available ............
1-69. Recommended Test Equipment .....
II INSTALLATION ............
2-1. Introduction ...............
2-3. Initial Inspection ............
2-5. Preparation for Use ...........
2-6. Power Requirements ........
2-8. Line Voltage and Fuse Selection
2-10. Power Cable .............
2-12. HP-IB Address and Parallel Poll
Response Selection .......
2-15. Interconnections ..........
2-17. Mating Connectors .........
2-20. Operating Environment ......
2-22. Bench Operation ..........
2-24. Rack Mounting ...........
2-26. Storage and Shipment .........
2-27. Environment .............
2-29. Packaging ...............
OPERATION ................
Ill
3-1.
3-4.
3-6.
3-8.
Introduction ................
Panel Features ...............
Operator's Maintenance .........
Mechanical Meter Zeroing . . . . .
3-10. Local Operation ..............
3-12. Local Operator's Check .........
3-14. Local Operating Instructions ......
3-16. Remote (HP-IB) Operation .......
3-20. Compatibility .............
3-23. Local/Remote and Remote/Local
Mode Changes ...........
Page
. 1-1
1-1
1-1 .
1-1
.
1-1 . 1-1
1-5
. 1-5
1-5
1-5
1-6 .
1-6
.
1-6 . 1-6
1-6
. 1-6
1-7
1-7 .
1-7 .
1-7 . 1-7
. 2-1
2-1
. 2-1
2-1
2-1 .
2-1
.
2-2
.
2-2 . 2-3
2-3
. 2-3
2-3
2-5 .
2-5
.
2-5 . 2-6
. 3-1
3-1
. 3-1
3-1
3-1 .
3-1
.
3-1 . 3-1
3-13
3-13
3-13 Section
3-28.
3-30.
3-40.
3-42.
3-44.
3-46.
3-48.
3-50.
3-52.
3-54.
3-56.
3-58.
3-62.
3-64.
3-66.
3-68.
Data
Messages
................
Receiving
Data Messages ......... Sending
Data Messages ........... Receiving
the Trigger Message ...... Receiving
the Clear Message ....... Receiving
the RemoteMessage ..... Receiving
the Local Message ....... Receiving
the Local Lockout Message . Receiving
the Clear Lockout/Set Local Message
.................. Receiving the
Pass Control Message . . Sending
the Require Service Message . Sending
the Status Byte Message .... Sending
the Status Bit Message ..... Receiving
the Abort Message ....... Programming
Quick Reference Guide . Programming
Examples .......... IV PERFORMANCE
TESTS ............... 4-1.
Introduction .......................
4-3. Equipment Required ..................
4-5. Test Record ........................
4-7. Calibration Cycle ....................
4-9. Abbreviated Performance Testing .........
4-11. Operational Verification Checks ..........
4-12. Output Level Flatness .................
4-13. Harmonics and Subharmonics ............
4-14.SWR ............................ 4-15.
FM Accuracy .......................
4-16. AM Distortion ......................
4-17. Amplitude Modulation Depth, Meter Accuracy
and Input Accuracy ................ 4-18.
Non-Harmonically Related Spurious (CW
and AM Modes) ............... 4-19. Power
Line Related Spurious (CW and
AM Modes) ..................... 4-20. Single-Sideband
Phase Noise Ratio .........
4-21. FM Frequency Response ..............
4-22. FM Harmonic and Non-Harmonic Distortion
. 4-23. Residual FM In FM and CW
Modes .......
4-24. RF Output Level and Accuracy ..........
4-25. Incidental Phase and Frequency Modulation
. 4-26. Frequency Switching Time .............
4-27. Output Level Switching Time ...........
4-28. AM Rates ........................ 4-29.
Incidental AM .....................
4-30. Internal Time Base Aging Rate ..........
ADJUSTMENT .... 5-1. Introduction ......
5-5. Safety Considerations
5-7. Equipment
Required . Page 3-13 3-13
3-19 3-19 3-19 3-19 3-19
3-19
3-19
3-19
3-19
3-19
3-20
3-20
3-20
3-20
.
4-1
4-1
. 4-1
. 4-1
.
4-1 .
4-1
4-2
. 4-4
. 4-5
. 4-7
4-10
4-11 4-15
4-19
4-20
4-22
4-25
4-27 4-29
4-31
4-35
4-37
4-39
4-42
4-43
4-44
5-1
5-1
5-1
5-1

Model 8672A
Section
CONTENTS (Cont'd)
Page Section
5-11. Factory Selected Components ...........
5-13. Related Adjustments .................
5-18. Adjustment Locations ................
5-20. A3 RF Source Assembly Adjustments ......
5-21. Power Supply Adjustments ...........
5-22. 10 MHz Reference Oscillator Adjustment .
5-23. Digital-to-Analog Converter Adjustment . .
5-24. YTO Driver Adjustment .............
5-25. Voltage Controlled Crystal Oscillator
(VCXO) Adjustment .............
5-26. M/N Loop Adjustments .............
5-27. YTO Loop Sampler Adjustments .......
5-28. YTO Loop Offset and FM Overmodulation
Adjustments ..................
5-29. YTO Loop Phase Detector Adjustment . . .
5-30. FM Driver Adjustment ..............
5-31. A2 Controller Assembly Adjustments ......
5-32. 160-240 MHz (20/30 MHz or LFS Loop)
VCO Pretune Adjustments .........
5-33. 20/30 MHz (LFS) Loop Divider Bias
Adjustments ..................
5-34. A2A4 Assembly Notch Filter Adjustment .
5-35. Al RF Output Assembly Adjustments .....
5-36. YTM Adjustments ................
5-37. ALC Adjustments .................
5-38. External Leveling Adjustments ........
5-39. AM Bandwidth Adjustment ..........
5-40. AM Meter Adjustment ..............
5-41. AM Meter Adjustment — Alternate
Procedure ....................
5-42. FM Adjustments ..................
VI REPLACEABLE PARTS ..............
6-1. Introduction ......................
. 5-1
. 5-1
. 5-2
. 5-6
. 5-6
. 5-7
. 5-8
. 5-9
5-10
5-12
5-14
5-17
5-19
5-21
5-22
5-22
5-23
5-24
5-25
5-25
5-29
5-32
5-34
5-35
5-36
5-37
6-2. Exchange Assemblies ....
6-3. Abbreviations ...........
6-4. Replaceable Parts List ....
6-5. Parts List Updating ......
6-6. Illustrated Parts Breakdown
6-7. Ordering Information ....
6-8. Recommended Spares List
VII MANUAL CHANGES
7-1. Introduction ......
7-3. Manual Changes ....
VIII SERVICE ...................
8-1. Introduction .................
8-5. Safety Considerations ...........
8-11. Principles of Operation ..........
8-13. Troubleshooting ...............
8-14. Arrangement in Manual ........
8-16. Supplemental Troubleshooting Aids
8-20. Recommended Test Equipment.....
8-22. Service Aids ..................
8-27. Repair .....................
8-29.
8-31.
8-33.
8-35.
8-41.
8-59. Logic Symbols ........
8-61. Qualifiers .........
8-63. Indicator Symbols . . .
8-65. Contiguous Blocks . . .
8-67. Dependency Notation .
8-69. Common Control Block
8-71. Complex Devices ....
Factory Selected Components........
Non-Field Repairable Assemblies .....
Module Exchange Program ..........
After Service Product Safety Checks . . .
Disassembly and Reassembly Procedures .
6-1
6-1
SERVICE SHEETS
Service Sheet
Overall Functional Block Diagram ......
A3 RF Source Assembly Troubleshooting .
A2 Controller Troubleshooting ........
Al RF Output Assembly Troubleshooting .
1-A1 RF Preamplifier and P/0 ALC Loop
(A1A5, A1A13, A1AT3) ..........
2-A1 YTM Control (A1A8, A1A3, A1A12,
A1AT2,A1FL1) ...............
3-A1 SRD Control (A1A7) ..............
4-A1 P/0 ALC Loop (A1A6, A1CR1, A1DC1) .
Page Service Sheet
8-33 5-A1 RF Output Level Control (A1A10, A1AT1)
8-34 6-A1 Digital Control (A1A11) .............
8-38 7-A1 Front Panel Controls and Displays (A1A1,
8-40 A1A2) ......................
8-A1 Metering Control (A1A9) ............
8-42 1-A2 20/30 MHz Divider (A2A5) ..........
2-A2 Phase Detector (A2A4) ..............
8-44 3-A2 VCO 160-240 MHz (A2A3) ...........
8-46 4-A2 HP-IB Address (A2A9) .............
8-48 5-A2 P/0 HP-IB Interface (P/0 A2A7) .......

Contents Model 8672A
SERVICE SHEETS (Cont'd)
Service Sheet Page
6-A2 P/0 HP-IB Interface (P/0 A2A7) ......... 8-68
7-A2 Register 1 (A2A10) .................. 8-70
8-A2 P/0 Timing and Control (P/0 A2A11) ..... 8-72
9-A2 P/0 Timing and Control (P/0 A2A11) ..... 8-74
10-A2 P/0 Output Register (P/0 A2A8) ........ 8-76
11-A2 P/0 Output Register (P/0 A2A8) ........ 8-78
12-A2 P/0 Front Panel (P/0 A2A1) ........... 8-80
13-A2 P/0 Front Panel (P/0 A2A1, A2A2) ...... 8-82
1-A3 Reference Phase Lock (A3A1A1, A3A8) .... 8-84
2-A3 100 MHz VCXO (A3A1A2) ............ 8-86
3-A3 M/N Phase Detector (A3A1A3) .......... 8-88
4-A3 M/N VCO (A3A1A4) ................ 8-90
5-A3 M/N Output (A3A1A5) ............... 8-92
6-A3 Digital-to-Analog Converter (A3A5) ....... 8-94
7-A3 YTO Main Coil Driver (A3A6) .......... 8-96
8-A3 YTO Sampler (A3A9A5, A3A9U1) ....... 8-98
9-A3 YTO Phase Detector (A3A9A2, A3A9A4) . . 8-100
Service Sheet Page
10-A3 FM Driver (A3A7, A3A9A1, A3A9A3,
A3A9A6, A3A9A7) ................ 8-102
11-A3 Rectifier Board (A3A2, A3A11) ........ 8-104
12-A3 Positive Regulator Board (A3A3) ........ 8-106
13-A3 Negative Regulator Board (A3A4) ....... 8-108
Al RF Output Assembly Interconnections,
and A1A14 Motherboard ............ 8-110
A2 Controller Assembly Interconnections
and A2A12 Motherboard ............ 8-113
A3A10 Mother Board Interconnections,
A3A1A6 Reference and M/N Mother
Board, and A3 Plug-in Circuit Board ..... 8-115
A3A9 Assembly and Cable Locations,
8672A Bottom View ............... 8-117
8672A Top Views .................. 8-119
Al, A2, and A3 Top Views of Adjustments
and Test Point Locations ............ 8-121
LIST OF ILLUSTRATIONS
2-1.
2-2.
2-3.
2-4.
3-1.
k
3-2.
3-3.
3-4.
3-5.
3-6.
3-7.
4-1.
4-2.
4-3.
4-4.
4-5.
Figure
1-1. HP Model 8672A and Accessories Supplied
1-2. 15 kHz Low Pass Filter .............
1-3. Special Interconnect Cable ...........
Line Voltage and Fuse Selection ........
Power Cable and Mains Plug Part Numbers .
Location of HP-IB Address and Parallel Poll
Switches .......................
Hewlett-Packard Interface Bus Connection .
Front Panel Connectors, Controls, Switches,
and Displays ....................
Rear Panel Connectors, Switches, and
Displays .......................
Operator's Frequency and Modulation
Checks Test Setup ................
Operator's External ALC Checks Test Setup
Frequency Programming .............
Typical frequency switching time showing
WORST CASE lock and settling times . . .
Programming Examples ..............
Typical Maximum Power Available on the
+10 dBm Range (over-range) ...........
SWR Test Setup ....................
FM Accuracy Test Setup ..............
AM Distortion Test Setup .............
Amplitude Modulation Depth Meter Accuracy
and Input Accuracy Test Setup .........
Page
. 1-0
1-10
1-10
. 2-1
. 2-2
. 2-3
. 2-4
3-2
. 3-4
. 3-6
. 3-8
3-16
3-18
3-22
. 4-2
. 4-7
4-10
4-11
.4-15
Figure Page
4-6. Power Line Related Spurious Test Setup ..... 4-21
4-7. Single-Sideband Phase Noise Ratio
Test Setup ........................ 4-23
4-8. FM Frequency Response Test Setup ........ 4-25
4-9. FM Distortion Test Setup ............... 4-27
4-10. Residual FM in FM and CW Modes
Test Setup ........................ 4-29
4-11. RF Output Level and Accuracy
Test Setup ........................ 4-32
4-12. Incidental Phase and Frequency Modulation
Test Setup ........................ 4-35
4-13. Frequency Switching Time Test Setup ...... 4-37
4-14. Output Level Switching Time Test
Setup ........................... 4-40
4-15. AM Rate Test Setup .................. 4-42
4-16. Incidental AM Test Setup ............... 4-43
4-17. Internal Time Base Aging Rate Test Setup .... 4-44
5-1. 10 MHz Reference Oscillator Adjustment
Test Setup ......................... 5-7
5-2. VCXO Adjustment Test Setup ........... 5-10
5-3. M/N Loop Adjustment Test Setup ......... 5-13
5-4. YTO Loop Sampler Adjustment Test
Setup ........................... 5-15
5-5. Typical Swept Frequency Response at
A3A9A5TP1 (frequency span per division
20 MHz) ......................... 5-16
5-6. YTO Loop Offset and FM Overmodulation
Test Setup ........................ 5-17
IV

Model 8672A
Figure
ILLUSTRATIONS (Cont'd)
Page Figure
5-7. YTO Loop Offset Adjustment Waveforms .
5-8. YTO Loop Phase Detector Adjustment
Test Setup .....................
5-9. Spectrum Analyzer Display of Phase
Locked-Loop Gain ...............
5-10. FM Driver Adjustment Test Setup ......
5-11. 20/30 MHz Loop Divider Bias Adjustment
Test Setup .....................
5-12. A2A4 Assembly Notch Filter Adjustment
Test Setup .....................
5-13. YTM Adjustment Test Setup .........
5-14. Typical YTM Response .............
5-15. AM Meter Adjustment Test Setup ......
5-16. FM Adjustment Test Setup ...........
6-1. Al and A2 Assembly Front Panel
Mechanical Parts...........
6-2. Synthesizer Cabinet Parts ......
7-1. A1A6 ALC Detector Assembly Component,
Adjustment, and Test Point Locations
(P/0 Change S)...................
P/0 ALC Loop Schematic (P/0 Change S). . .
7-2.
7-3. P/0 A2A11 Timing and Control Assembly
Component, Adjustment, and Test Point
Locations (P/0 Change T)............
P/0 A2A11 Timing and Control Assembly
Component and Test Point Locations
(P/0 Change T). ..................
7-4
P/0 Timing and Control Assembly Schematic
Diagram (P/0 Change T).............
7-5
7-6.
7-7.
Cable Connections (P/0 Change Z) .........
A1A6 ALC Detector Assembly Component,
Adjustment, and Test Point Locations
(P/0 Change AD) ..................
A1A3A1 YTM Assembly Component,
Adjustment, and Test Point Locations
(P/0 Change AK) ..................
7-8.
P/0 Digital Control Schematic Diagram
7-9 (P/0 Change AW) ..................
7-10. P/0 Register 1 Assembly Schematic Diagram
(P/0 Change AW) ..................
5-18
5-19
5-20
5-21
5-23
5-24
5-26
5-28
5-35
5-37
6-19
6-63
7-10
7-10
7-12
7-13
7-14
7-17
7-18
7-21
7-26
7-27
8-1.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
Schematic Diagram Notes ............
Rear Panel of the Synthesizer .........
Al and A2 Assembly Front Panel Fully
Extended .....................Bottom of the Synthesizer ......
A3A9 Assembly in Service Position . ...
Qualifiers .................. ...
Contiguous Blocks ................
8-2
8-7
8-8
8-10
8-11
8-14
8-15
8-8. Indicator Symbols ...................
8-9. AND Dependency Notation .............
8-10. OR and Free Dependency Notation ........
8-11. AND Dependency Notation, Coder
Example Using Letters ................
8-12. Common Control Block ................
8-13. Quad D-Type Latch (Individual) ..........
8-14. Quad D-Type Latch (Combined) ..........
8-15. Quad D-Type Latch Example ............
8-16. Multiplexer (AND-OR Selected) Example ....
8-17. Shift Register Example ................
8-18. Up-Down Counter Example .............
8-19. Synthesizer's Simplified Block Diagram .....
8-20. Major Assembly Locations ..............
8-21. Overall Functional Block Diagram .........
8-22. A3 RF Source Assembly Troubleshooting
Block Diagram .....................
8-23. A2 Controller Troubleshooting Block
Diagram .........................
8-24. Al RF Output Assembly Troubleshooting
Block Diagram .....................
8-25. A1A5 ALC Assembly Component, Adjustment
and Test Point Locations ..............
8-26. RF Preamplifier and P/0 ALC Loop
Block Diagrams ....................
8-27. RF Preamplifier and P/0 ALC Loop
Schematic ........................
8-28. A1A3 YTM Assembly Component,
Adjustment, and Test Point Locations .....
8-29. A1A8 YTM Driver Assembly Component
Adjustment, and Test Point Locations .....
8-30. YTM Control Block Diagrams ............
8-31. YTM Control Schematic Diagram .........
8-32. A1A7 SRD Bias Assembly Component,
Adjustment, and Test Point Locations .....
8-33. SRD Control Block Diagrams ............
8-34. SRD Control Schematic Diagram ..........
8-35. A1A6 ALC Detector Assembly Component,
Adjustment, and Test Point Locations .....
8-36. P/0 ALC Loop Block Diagrams ...........
8-37. P/0 ALC Loop Schematic ..............
8-38. A1A10 Level Control Assembly Component,
Adjustment, and Test Point Locations .....
8-39. RF Output Level Control Block Diagrams ....
8-40. RF Output Level Control Schematic
Diagram .........................
8-41. A1A11 Digital Processor Assembly Component,
Adjustment, and Test Point Locations .....
8-42. Digital Control Block Diagrams ...........
8-43. Digital Control Schematic Diagram ........
8-44. A1A2 Display Driver Assembly Component
Locations ........................

Contents Model 8672A
Figure
ILLUSTRATIONS (Cont'd)
Page Figure Page
8-45. A1A2 Front Panel Assembly Component, 8-75.
Switches, and Test Point Locations ....... 8-54
8-46. Front Panel Controls and Displays Block 8-76.
Diagrams ......................... 8-55 8-77.
8-47. Front Panel Controls and Displays
Schematic Diagram .................. 8-55 8-78.
8-48. A1A9 Metering Assembly Component,
Adjustment, and Test Point Locations ..... 8-56 8-79.
8-49. Metering Control Block Diagrams ......... 8-57 8-80.
8-50. Metering Control Schematic Diagram ....... 8-57
8-51. A2A5 20/30 MHz Divider Assembly 8-81.
Component, Adjustment, and Test
Point Locations .................... 8-58 8-82.
8-52. 20/30 MHz Divider Block Diagrams ........ 8-59 8-83.
8-53. 20/30 MHz Divider Assembly Schematic
Diagram ......................... 8-59 8-84.
8-54. A2A4 20/30 Phase Detector Assembly
Component, Adjustment, and Test Point 8-85.
Locations ........................ 8-60 8-86.
8-55. 20/30 MHz Phase Detector Block
Diagrams ......................... 8-61 8-87.
8-56. 20/30 MHz Phase Detector Assembly
Schematic ........................ 8-61 8-88.
8-57. A2A3 160—240 MHz Assembly Component 8-89.
Locations ........................ 8-62
8-58. VCO 160-240 MHz Block Diagrams ...... 8-63 8-90.
8-59. VCO 160—240 MHz Assembly Schematic
Diagram ........................ 8-63
8-60. A2A9 HP-IB Address Assembly Component 8-91.
Locations ....................... 8-64 8-92.
8-61. HP-IB Address Block Diagrams .......... 8-65
8-62. HP-IB Address Assembly Schematic 8-93.
Diagram ........................ 8-65
8-63. P/0 A2A7 Interface Assembly Component
and Test Point Locations ............. 8-66 8-94.
8-64. P/0 Interface Block Diagrams ........... 8-67 8-95.
8-65. P/0 HP-IB Interface Assembly Schematic
Diagram ........................ 8-67 8-96.
8-66. P/0 A2A7 Interface Assembly Component
Locations ....................... 8-68 8-97.
8-67. P/0 Interface Block Diagrams ........... 8-69 8-98.
8-68. P/0 Interface Assembly Schematic Diagram . . 8-69
8-69. A2A10 Register 1 Assembly Component 8-99.
Locations ....................... 8-70
8-70. Register 1 Block Diagrams ............. 8-71
8-71. Register 1 Assembly Schematic Diagram .... 8-71 8-100,
8-72. P/0 A2A11 Timing and Control Assembly 8-101,
Component, Adjustment, and Test Point 8-102,
Locations ....................... 8-72
8-73. P/0 Timing and Control Block Diagrams .... 8-73 8-103
8-74. P/0 Timing and Control Schematic Diagram . 8-73 8-104
P/0 A2A11 Timing and Control Assembly
Component and Test Point Locations ..... 8-74
P/0 Timing and Control Block Diagrams .... 8-75
P/0 Timing and Control Assembly
Schematic Diagram ................. 8-75
P/0 A2A8 Output Register Assembly
Component and Test Point Locations ..... 8-76
P/0 Output Register Block Diagrams ...... 8-77
P/0 Output Register Assembly Schematic
Diagram ........................ 8-77
P/0 A2A8 Output Register Assembly
Component and Test Point Locations ..... 8-78
P/0 Output Register Block Diagrams ...... 8-79
P/0 Output Register Assembly Schematic
Diagram ........................ 8-79
P/0 A2A1 Front Panel Assembly Component
Locations ....................... 8-80
P/0 Front Panel Block Diagrams ......... 8-81
P/0 Front Panel Assembly Schematic
Diagram ........................ 8-81
P/0 A2A1 Front Panel Assembly Component
Locations ....................... 8-82
P/0 Front Panel Block Diagrams ......... 8-83
P/0 Front Panel Assembly Schematic
Diagram ........................ 8-83
A3A1A1 Reference Phase Lock Board
Assembly Component and Test Point
Locations ....................... 8-84
Reference Phase Lock Block Diagrams ..... 8-85
Reference Phase Lock Assembly Schematic
Diagram ......................... 8-85
A3A1A2 100 MHz VCXO Assembly
Component, Adjustment, and Test
Point Locations ................... 8-86
100 MHz VCXO Block Diagrams ......... 8-87
100 MHz VCXO Assemlby Schematic
Diagram ........................ 8-87
A3A1A3 M/N Phase Detector Assembly
Component and Test Point Locations ..... 8-88
M/N Phase Detector Block Diagrams ...... 8-89
M/N Phase Detector Assembly Schematic
Diagram ........................ 8-89
A3A1A4A2 M/N VCO Board Assembly
Component, Adjustment, and Test Point
Locations ....................... 8-90
M/N VCO Block Diagrams ............. 8-91
M/N VCO Assembly Schematic Diagram .... 8-91
A3A1A5 M/N Output Assembly
Component Locations ............... 8-92
M/N Output Block Diagrams ............ 8-93
M/N Output Assembly Schematic Diagram . . 8-93
VI

Model 8672A
Figure
8-105. A3A5 DAC Assembly Component,
Adjustment, and Test Point Locations .... 8-94
8-106. Digital-to-Analog Converter Block
Diagrams ........................ 8-95
8-107. Digital-to-Analog Converter Schematic
Diagram ........................ 8-95
8-108. A3A6 YTO Main Coil Driver Assembly
Component, Adjustment, and Test Point
Locations ....................... 8-96
8-109. YTO Main Coil Driver Block Diagrams ..... 8-97
8-110. YTO Main Coil Driver Schematic Diagram . . . 8-97
8-111. A3A9A5 YTO Sampler Assembly
Component, Adjustment, and Test
Point Locations ................... 8-98
8-112. YTO Sampler Block Diagrams ........... 8-99
8-113. YTO Sampler Assembly Schematic
Diagrams........................ 8-99
8-114. A3A9A4 YTO Phase Detector Assembly
Component, Adjustment, and Test
Point Locations .................. 8-100
8-115. YTO Phase Detector Block Diagrams ..... 8-101
8-116. YTO Phase Detector Schematic Diagram . . . 8-101
8-117. A3A7 FM Driver Assembly Component
Adjustment, and Test Point Locations . . . 8-102
8-118. FM Driver Block Diagrams ............ 8-103
8-119. FM Driver Assembly Schematic Diagram . . . 8-103
8-120. A3A2 Rectifier Assembly Component,
Adjustment and Test Point Locations .... 8-104
8-121. Rectifier Block Diagrams ............. 8-105
8-122. Rectifier Board Assembly Schematic
Diagram ....................... 8-105
8-123. A3A3 Positive Regulator Assembly
Component, Adjustment, and Test
Point Locations .................. 8-106
8-124. Positive Regulator Block Diagrams ....... 8-107
8-125. Positive Regulator Board Assembly
Schematic Diagram ................ 8-107
ILLUSTRATIONS (Cont'd)
Page Figure
8-126. A3A4 Negative Regulator Assembly
Component and Test Point Locations . . .
8-127. Negative Regulator Block Diagrams .....
8-128. Negative Regulator Board Assembly
Schematic Diagram ...............
8-129. Remote Operator's Checks Test
Setup ........................
8-130. Major Assembly Locations ...........
8-131. Al to A2 Interconnections ...........
8-132. A1A14 Mother Board Assembly Connector
Locations .....................
8-133.
8-134.
8-135.
8-136.
8-137.
8-138.
8-139.
8-140.
8-141.
8-142.
8-143.
8-144.
8-145.
8-146.
8-147.
Major Assembly Locations ............
A2A12 Mother Board Assembly Component
Locations ......................
A3A10 RF Source Mother Board
Component Locations ..............
A3A1A6 Reference and M/N Mother Board
Assembly Component and Connector
Locations ......................A3 Plug-in Circuit Board Adjustment and
Test Point Locations ...............
A3A9 Assembly Locations ............
A3A9 Cable Connections .............
Major Assembly Locations ............
Bottom View Assembly Locations .......
Major Assembly Locations ............
Top View Assembly Locations .........
Top View Chassis Mounted Parts,
Assembly Locations ...............
Major Assembly Locations ............
Top View A2 and A3 Assemblies Adjust¬
ments and Test Point Locations ........
Top View Al Assembly Adjustment
Locations ......................

Contents Model 8672A
Table
1-1.
1-2.
2-1.
3-1.
3-2.
3-3.
3-4.
3-5.
3-6.
3-7.
3-8.
3-9.
3-10.
4-1.
4-2.
4-3.
4-4.
5-1.
Specifications .....................
Recommended Test Equipment ..........
USA Standard Code for Information
Interchange (ASCII) ................
Front Panel Features .................
Rear Panel Features .................
Local Operator's Checks ..............
Local Operating Instructions ............
Message Reference Table ..............
Frequency Program Codes and Arguments . . .
Output Level ......................
Modulation .......................
ALC Arguments (with RF ON) ..........
Programming Quick Reference Guide ......
Record of Operational Verification Checks . .
Harmonic Level versus Percentage Distortion .
Modulation Index ...................
Factory Selected Components ...........
TABI
Page
. . 1-2
. . 1-8
. . 2-5
30
. . 3-4
. . 3-5
. . 3-9
. 3-14
. 3-15
. 3-17 .
. 3-17
117
. 3-21
. . 4-4
. 4-14
. 4-16
. 4-46
. . 5-2
LES
Table
5-2.
5-3.
6-1.
6-2.
6-3.
6-4.
7-1.
7-2.
8-1.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
Performance Test Failure and Required
Action .........................
Related Adjustments .................
Part Numbers for Exchange Assemblies .....
Reference Designations and Abbreviations . . .
Replaceable Parts ...................
Manual Changes by Serial Number Prefix . . .
Summary of Changes by Component ......
HP-IB Diagnostic Program .............
Front Panel Status Annunciators .........
Overall Troubleshooting ...............
Listing of all M and N Numbers and
Resulting Frequencies ................
Remote Operator's Check .............
RF Output Assembly (Al) Inteconnections . .
Controller Assembly (A2) Interconnections . .
Motherboard Assembly (A3A10)
Interconnections ..................
Page
. . 5-3
. . 5-4
60
. . 6-3
. . 6-5
. 6-65
. . 7-1
. . 7-2
8-20
8-30
8-31
. 8.35
8-110
8-111
8-113
8-115
V111