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1、I . : HP Archive . . This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! . . On-line curator: Tony Gerbic RadioFans.CN 收音机爱 好者资料库 h m i SPECTRUM DISPLAY 3720A *- WWW.HPARCHIVE.COM RadioFans.CN 收音机爱 好者资料库 I - J . - - - - HEWLETT TPACKARD u SERVICE
2、MANUAL MODEL 3720A SPECTRUM DISPLAY SERIAL PREFIX This manual applies to all instruments having serial prefix 1209U. Instruments with a serial prefix above 1209U may have a Manual Change Sheet, to which reference should be made. WWW.HPARCHIVE.COM For Free Distribution Only ,. Copyright HEW LETT-PAC
3、KAR D LIMITED 1972 SOUTH QUEENSFERRY, WEST LOTHIAN, SCOTLAND 03720-95001 WWW.HPARCHIVE.COM Printed: APRIL 1972 I RadioFans.CN 收音机爱 好者资料库 F O R E W O R D For convenience and ease of use, information on Model 3720A Spectrum Display has been presented in two publications: .OPERATING MANUAL hp Part Numb
4、er 03720-95000 (Microfiche 03720-95025) Foreword .SERVICE MANUAL hp Part Number 03720-95001 (Microfiche 03720-95026) HOW TO ORDER To order the above publications contact the nearest Hewlett-Packard Sales and Service Office (addresses at the rear of this manual). Give the hp Part Number of the public
5、ation and the complete model number, name and serial number of the in- strument. SERVICE MANUAL CONTENT Section I contains General Servicing Instructions and a Description of Controls and Indicators. Section Section Section I gives information on Parts Identification, Maintenance and Repair Procedu
6、res. II contains a list of Replaceable Parts for the 3720A. V gives the 3721A/3720A System Troubleshooting Procedure. Section V contains the Functional Diagram, Assembly Location Diagrams and Assembly Packages including Schematic and Component Location. MICROFICHE rhese publications are also availab
7、le in 6in x 4in microfiche form. Each sheet contains up to 60 pages, maximum, of text and illustrations. Order as above, quoting the appropriate hpmicrofiche part number. ii WWW.HPARCHIVE.COM List of Contents LIST OF CONTENTS SECTION I INTRODUCTION Paragraph 1 . 1 1-3 OPERATING INSTRUCTIONS . . . .
8、. . . . . . . . GENERAL SERVICING INSTRUCTIONS . . Page 1-1 . 1-1 Table Figure 1-1 Accessories furnished with 3720A . . . . . . . 1-1 1-1 1-2 1-3 Model 3720A Spectrum Display . . . . . . . . . . . . . . Front panel controls and indicators Rear panel controls and connectors . . . . . . . . . . . . .
9、. 1-0 1-2 1-4 SECTION II GENERAL MAINTENANCE Paragraph 2-1 2-3 INTRODUCTION . . . . . . . . . IDENTIFICATION . . . . . . . . . 2-4 Assembly Identification . . . . . . . . . 2-6 Assembly Connection Identification . 2-8 Integrated Circuit Identification . . . INSTRUMENT DlSMANTLl NG . . . . . . . . .
10、. . . 2-16 Removing Top and Bottom Covers . 2-1 7 Removing Side Covers . . . . . . . . . . . 2-1 8 Front Panel Access . . . . . . . . . . . . . MAINTENANCE 2-20 Locations of dc Power Supply Fuses . . . . . . . 2-23 Replacement of Display Sensitivity Lamps . . . 2-27 Cleaning the Air Filter . . . . .
11、 . . . . . . . . . 2-29 Cathode Ray Tube RemovaI/RepIacement . . . . . . . . . . . . . . 2-30 Line Transformer Removal/Replacement . . . . . . . . . . . . . . . . 2-31 Chassis Mounted Transistors Plate Removal/Replacement . 2-32 High Voltage Tripler Assembly Removal/Replacement . . . . REPAIR PROCED
12、URES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34 Etched Circuits . . . . . . . . . . . . . . . . . . . . . . . 2-36 Integrated Circuit Removal/Replacement . Page 2-1 . . . . . . 2-1 . . . 2-1 . . . 2-1 2- 1 . . . 2-2 . . . 2-2 2-2 2-3. 2-1 5 . . . . . . . . . . . . . . . . . . . . .
13、 . 2-19 . . . 2-3 . . . 2-3 . . . 2-4 . . . 2-4 . . . 2-5 . . . 2-5 . . . 2-5 . . . 2-5 . . . 2-5 . . . 2-6 2-33 3720A Assem bl ies . . . . . . . . . . . . . . Digital integrated circuit abbreviations . Table 2- 1 2-2 . . . 2-1 2-2 F igu re 2- 1 2-2 A18/A19 Housing assembly retaining screws . CRT ne
14、ck connections . . . . . . . . . . . . . . . . . . . 2-3 . . . 2-4 SECTION 111 REPLACEABLE PARTS Paragraph 3- 1 3-3 3-7 I NT R 0 DUCT I 0 N ORDERING INFORMATION . REFERENCE DESIGNATORS . . . . . . . . . . . . . . . Page 3-1 . . . . . 3-1 . 3-1 . Ill WWW.HPARCHIVE.COM iable Figure 3- 8 3-9 LIST OF AB
15、BREVIATIONS . COLOUR ABBREVIATIONS . Model 3720A . 3-4 . 3-50 . 3-49 P 3- 1 3- 2 3- 1 Replaceable Parts . . . . . . . . . . Code List of Manufacturers . Location of cabinet components . SECTION IV SYSTEM TROUBLESHOOTING . . . . . . . . . . . . . . . . . I Paragraph 4-1 4-3 4-8 4-12 4-14 4-16 4- 1 9
16、4-2 1 4-23 4-25 4-27 rable 4- 1 4- 2 4-3 4-4 4-5 4-6 4-7 4-8 Figure 4- 1 4-2 4-3 4-4 4-5 Paragraph 5-1 5-3 Figure 5-5 5-9 INTRODUCTION . . . . . . . . . . . . . . . . . . . . USING TROUBLESHOOTING SECTION . TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10 Logic Probe . . . . .
17、 . . . . . . . . . . . . . . . . . . . . . . . . SYSTEM TROUBLESHOOTING CONTROLS SET-UP FLOW A . Control Faults FLOW B . Display Sensitivity Faults . . . . . . . . . . . . FLOW C . Data Transfer Faults ,. FLOW D . Other Transferred Signals Faults FLOW D(a) . Timescale Transfer Faults FLOW D(c) . Sig
18、nal Recovery Transfer Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FLOW D(b) . Gain Correction Factors Transfer Faults . . . . . . . Flow charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3721A/3720A System repair
19、 procedure . . . . . . . . . . . . Test equipment required for System Troubleshooting . Range transfer check . . . . . . . . . . . . . . . . . . . . . . . . . . Range data logic check . . . . Ti mescale transfer check . . . . . . . . . . . . . . Gain correction factors check . . . . . . . . . . Sign
20、al recovery transfer check . . . . 750KHz . . . . . . . . . . . . . . . . . . Transfer Data duration . Data Ready . . . . . . . . . . . . . . Transfer Data repetition rate . Multiplexed range outputs . SECTION V SCHEMATICS. COMPONENT LOCATIONS. DIAGRAMS INTRODUCTION . . . . . DRAWING SYMBOLS . . . .
21、 . . . . . . . ASSEMBLY PACKAGES . . . . . . . . . . . . 5-7 Locating Assembly Packages . . . . THEORY OF OPERATION . . . . . . . 5-10 Functional Diagram . 5-1 Guide to schematics . 5-2 Logic package outlines . . . Page 4-1 . 4-1 . 4-2 . 4-2 . 4-3 . 4-5 . 4-6 c . 4-7 . 4-8 . 4-8 k . 4-9 . 4-10 I 9 .
22、 4-1 . 4-1 . 4-2 . 4-6 . 4-6 . 4-9 . 4-10 . 4-10 . 4-4 . 4-4 . 4-4 . 4-4 4-6 c Y . . . . Page 5-1 . . . . . 5-1 . . . . . 5-1 . 5-1 . 5-1 . 5-1 1 i . 5-2 . 5-3 WWW.HPARCHIVE.COM List of Contents 5-3 5-4 5- 5 5-6 5-7 5-8 5-9 Functional diagram . . . . . . . . . . . . 5-4 Guide to logic symbols . . .
23、. . . . . . . . . . . . . . . 5-4 Location of components (front and rear panels) . . . . . . . . . 5-5 Location of assemblies and chassis mounted components (top view) . . . . 5-6 Location of assemblies and chassis mounted components (underside view) . . 5-7 Wiring of rotary switches . . . . . . . .
24、 . . . . . . . . . . . . 5-61 Wiring of rear panel connectors 5-63 A1 Not Assigned A2 Mantissa Range Assembly Package Figure A2-1 Component location, A2 . . . . . . . . . . . A2-2 Schematic A2 (part 1 ), Mantissa Range assembly . A2-3 Schematic A2 (part 21, Mantissa Range assembly . . Page 5-10 . .
25、. 5-11 5-13 A3 Decade Range Assembly Package Figure A3-1 Component location, A3 . . . . . . . A3-2 Schematic A3, Decade Range assembly . . Page 5-14 . . . 5-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A4 Store 1 Assembly Package Table A4-1 Component identification grid, A4 . P
26、age 517 . 5-16 _. 5-17 . 5-19 Figure A4-1 Component location, A4 . . . . . ., A4-2 Schematic A4 (part 11, Store 1 assembly . A4-3 Schematic A4 (part 21, Store 1 assembly . A5 Store 2 Assembly Package Figure A5-1 Component location, A5 . . . . 45-2 Schematic A5, Store 2 assembly ._ _. . Page 5-20 . .
27、 . 5-21 A6 Buffer Assembly Package Figure . A6-1 Component location, A6 . . . . A6-2 Schematic A6, Buffer assembly ._ . Page 5-22 . _ _ _ _ 5-23 A7 Switch Card Assembly Package Table A7-1 Component identification grid, A7 . Page 5-25 F igu re A7-1 Component location, A7 . . . . ._ . A7-2 Schematic A
28、7, Switch Card assembly . . . 524 . 5-25 A8 Hybrid Multiplier Assembly Package Table A8-1 Component identification grid, A8 . . . . Page 5-27 Figure A8-1 Component location, A8 . . . . ._ . . ._ A8-2 Schematic A8, Hybrid Multiplier assembly . _. 5-26 . 527 , WWW.HPARCHIVE.COM . , . . _ . Page 5-29 .
29、 5-28 Model 3720A A9 Window Multiplier Assembly Package Table A9-1 Component identification grid, A9 . F igu re A9-1 Component location, A9 . . . . . . . . . . . . . . . A9-2 Schematic A9, Window Multiplier assembly . . 529 A10 Integrator Assembly Package Table A10-1 Component identification grid, A
30、10 . . Page 5-31 . 5-30 . 5-31 Figure A10-1 Component location, A10 . . . . . . . . . . A10-2 Schematic A10, Integrator assembly . . . . . . . . . . A1 1 Polar Converter Assembly Package Table A1 1-1 Component identification grid, A1 1 Page 5-33 . 532 . 5-33 F igu re A1 1-1 Component location, A1 1
31、. . . . . . . . . . . . A1 1-2 Schematic A1 1, Polar Converter assembly . A1 2 Low Voltage Power Supply Assembly Package Table A12-1 Component identification grid, A12 . . . . . . . . . . . Page 5-37 1 Figure A12-1 Component location, Chassis Mounted Transistors . . . . . . . . A12-2 Schematic, Line
32、 Module and Line Transformer . . . . . . . . . . A1 2-4 Schematic A1 2, Low Voltage Power Supply assembly A12-3 Component location, A12 . . . 5-34 . 5-35 _. ._ 5-36 . 5-37 . . . A1 3 Control Logic Assembly Package Table A13-1 Component identification grid, A13 . . Page 5-39 . _. 5-38 . 5-39 . 541 Fi
33、gure A13-1 Component location, A13 . A13-2 Schematic A13 (part 11, Control Logic assembly . A13-3 Schematic A13 (part 2), Control Logic assembly . A14 Triangle Wave Generator Assembly Package Table A14-1 Component identification grid, A14 . . Page 5-43 Figure A14-1 Component location, A14 . A14-2 Sc
34、hematic A14 (part 11, Triangle Wave Generator assembly A14-3 Schematic A14 (part 2), Triangle Wave Generator assembly . . . 542 r . 5-43 . 5-45 . A15 Sine Shaper Assembly Package Table A15-1 Component identification grid, A15 . Page 5-47 Figure A151 Component location, A15 . . . . . . . . . . . . .
35、. . A1 5-2 Schematic A1 5 (part 11, Sine Shaper assembly A15-3 Schematic A15 (part 21, Sine Shaper assembly . . . 5-46 . 5-47 ,. 5-49 vi WWW.HPARCHIVE.COM A16 Deflection Amplifiers Assembly Package Table A16-1 Component identification grid, A16 F igu re 1 A16-1 Component location, A16 . . . . . . .
36、. _. . . . A16-2 Schematic A16 (part l), Deflection Amplifiers assembly A16-3 Schematic A16 (part 21, Deflection Amplifiers assembly . I A1 7 High Voltage Power Supply Assembly Package Table A17-1 Component identification grid, A17 Figure A17-1 Component location, A17 . . . . . . . . . . . A17-2 Sch
37、ematic A17, High Voltage Power Supply assembly . A1 8 Range Indicator Assembly Table A18-1 LED Truth Table _. Figure A18-1 Component location, A18 . _. . . . . _. A18-2 Schematic A18, Range Indicator assembly . i A19 Range Units Assembly Package Figure A19-1 Component location, A19 . . . . . . . A19
38、-2 Schematic A19, Range Units assembly A20 Storage Assembly Package Table A20-1 Component identification grid, A20 Figure A20-1 Component location, A20 . . .; A20-2 Schematic A20,Storage assembly . WWW.HPARCHIVE.COM . . . . . . . . . . List of Contents . Page 5-51 . 5-50 . 5-51 - . 5-53 . . Page 5-5
39、5 . . . 554 . 5-55 . . Page 5-57 , . 5-56 . 5-57 . . Page 556 ,. . . 5-57 ._ . Page 5-59 . . . 5-58 , . 5-59 vii - Model 3720A t Figure 1-1 Model 3720A Spectrum Display L 1-0 WWW.HPARCHIVE.COM 1 3 1-1 OPERATING INSTRUCTIONS Section I SECTION I INTRODUCTION 1-5 Remember, when servicing the 3721A/3720
40、A System, that a high intensity CRT display on the 3720A over an extended period of time may cause burn damage to the storage mesh or phosphors of theCRT, 1-2 Detailed operating instructions are contained in the 3720A Operating Manual but, for conven- ience, descriptions of the controls, indicators
41、and connectors on the front and rear panels of the 3720A are included in this section. 1-6 The storage CRT in the 3720A is mechani- cally delicate and is easily damaged by violent 1-3 GENERAL SERVICING INSTRUCTIONS movement or by being inverted. To prevent accidental damage in use, remember the foll
42、owing points when handling the 3720A: 1-4 When servicing the 3721A/3720A System, Table 1-1 Accessories furnished with 3720A Accessory hp Part Number Detachable Power Cord Various Rack Mounting Kit 5060-8742 Servicing Extender Board 03720-70021 3721 A/3720A Interface Accessory 15549A Trimming Tool 87
43、30-001 3 Operating Manual 037 20-95000 Service Manual 03720-9500 1 WWW.HPARCHIVE.COM WWW.HPARCHIVE.COM For Free Distribution Only 1-1 Model 3720A 1. 2. 3 . 4. 5. 2 1 27 26 25 28 29 30 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ii is 21 31 24 23 22 DISPLAY: 8 y 10 division CRT, with graticule calibrated in o
44、ne division squares. Major axes cali- brated in 0.2 division intervals. 1 division = 0.95cm. 6. STORAGE TIME: potentiometer. Varies the time any display is stored, when in STORE mode. DISPLAY SENSITIVITY: illuminated digital readout. Scales the horizontal and vertical axes and the fre- quency .inter
45、val, Af, as selected by Scale Factor switch. SCALE FACTOR: lever switch. Selects axis calibra- tion t o be presented on the Display Sensitivity panel. ERASE: pushbutton. Eradicates all traces displayed on storage CRT screen, when not in STORE mode. INTENSITY: potentiometer. Controls brightness of CR
46、T beam. 7. 8. 9. 10. FOCUS: potentiometer. Adjusts sharpness of CRT beam. PERSISTENCE: potentiometer. Controls duration of written trace, when not in STORE mode. Fully clockwise position selects STORE mode. INPUT: lever switch. Routes data from the 3721A into Store 1 or 2 as selected. In HOLD positi
47、on retains data in stores. LINE-ON: toggle switch. Controls ac supply t o the instrument. Figure 1-2 Front panel controls and indicators L 1-2 WWW.HPARCHIVE.COM Section I 11. 12. DATA: lever switch. In positions 1 or 2 displays contents of respective store on CRT. In extreme right- hand position transfers control to SPECTRUM switch. 21. HORIZONTAL: rotary switch. Selects function to be presented on horizontal axis of CRT. Used toget
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