Tektronix 1740A Series User manual

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Instra

Service Manual
1740A/1750A/1760–Series
Waveform/Vector Monitor
070-8469-00
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to the Safety Summary prior to
performing service.
Please check for change information at the rear
of this manual.
First Printing January 1994
Revised October 1994
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Copyright Tektronix, Inc., 1993. All rights reserved. Printed in U.S.A.
Tektronix products are covered by U.S. and foreign patents, issued and pending.
Information in this publication supersedes that in all previously published
material. Specifications and price change privileges reserved. The following are
registered trademarks: TEKTRONIX and TEK.
For product related information, phone: 800-TEKWIDE (800-835-9433), ext.
TV.
For further information, contact: Tektronix, Inc., Corporate Offices, P.O. Box
1000, Wilsonville, OR 97070–1000, U.S.A. Phone: [phone]; TLX:
192825; TWX: (910) 467–8708; Cable: TEKWSGT.
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WARRANTY
Tektronix warrants that this product, that it manufactures and sells, will be free from defects
in materials and workmanship for a period of three (3) years from the date of shipment. If
any such product proves defective during this warranty period, Tektronix, at its option, ei-
ther will repair the defective product without charge for parts and labor, or will provide a
replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect
before the expiration of the warranty period and make suitable arrangements for the per-
formance of service. Customer shall be responsible for packaging and shipping the defec-
tive product to the service center designated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the shipment is to a location
within the country in which the Tektronix service center is located. Customer shall be re-
sponsible for paying all shipping charges, duties, taxes, and any other charges for products
returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or
improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish
service under this warranty a) to repair damage resulting from attempts by personnel other
than Tektronix representatives to install, repair or service the product; b) to repair damage
resulting from improper use or connection to incompatible equipment; c) to repair any
damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a prod-
uct that has been modified or integrated with other products when the effect of such modifi-
cation or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS
PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR IM-
PLIED.TEKTRONIX ANDITSVENDORS DISCLAIMANY IMPLIEDWARRAN-
TIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE
PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE
CUSTOMERFOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITSVEN-
DORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER
TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBIL-
ITY OF SUCH DAMAGES.
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The three members of the 1740A Series
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German Postal Information
Certificate of the Manufacturer/Importer
We hereby certify that the 1740A/1750A/1760- eries Waveform Vector Monitor and all factoryĆinstalled
options complies with the RF Interference uppression requirements of Postal Regulation Vfg. 243/1991,
Amended per Vfg. 46/1992
The German Postal ervice was notified that the equipment is being marketed.
The German Postal ervice has the right to reĆtest the series and to verify that it complies.
TEKTRONIX
Bescheinigung des Herstellers/Importeurs
Hiermit wird bescheinigt, daß der/die/das 1740A/1750A/1760- eries Waveform Vector Monitor und alle
fabrikinstallierten Optionen in Übereinstimmung mit den Bestimmungen der AmtsblattĆVerfügung Vfg.
243/1991 und Zusatzverfügung 46/1992 funkentstört sind.
Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerätes angezeigt und die Berechtigung zur
Überprüfung der erie auf Einhalten der Bestimmungen eingeräumt.
TEKTRONIX
NOTICE to the user/operator:
The German Postal ervice requires that ystems assembled by the operator/user of this instrument must
also comply with Postal Regulation, Vfg. 243/1991, Par. 2, ect. 1.
HINWEI für den Benutzer/Betreiber:
Die vom Betreiber zusammengestellte Anlage, innerhalb derer dieses Gerät eingesetzt wird, muß ebenfalls
den Voraussetzungen nach Par. 2, Ziff. 1 der Vfg. 243/1991, genügen.
NOTICE to the user/operator:
The German Postal ervice requires that this equipment, when used in a test setup, may only be operated if
the requirements of Postal Regulation, Vfg. 243/1991, Par. 2, ect. 1.8.1 are complied with.
HINWEI für den Benutzer/Betreiber:
Dieses Gerät darf in Meßaufbauten nur betrieben werden, wenn die Voraussetzungen des Par. 2, Ziff. 1. 8.1
der Vfg. 243/1991 eingehalten werden.
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Standards Compliance
The 1740A/1750A/1760–Series Waveform Vector Monitors comply with the
following safety standards:
•Underwriters Laboratories: UL1244 — Second Edition—Standard for Electrical
and Electronic Measuring and Testing Equipment
•Canadian Standards Association: C22.2 No. 231 Series–M89—CSA Safety Re-
quirements for Electrical and Electronic Measuring and Testing Equipment
•American National Standard: ANSI/ISA–S82–1988—Safety Standard for Electri-
cal and Electronic Test, Measuring, Controlling and Related Equipment
•International Standard: IEC 348—Second Edition—Safety Requirements for Elec-
tronic Measuring Apparatus
The 1740A/1750A/1760–Series Waveform Vector Monitors comply with the
following regulatory standards:
•U.S. EMI: FCC Rules, Part 15, Subpart J, Class A
•German EMI: VDE 0871.5 (Class B)—Radio frequency Interference Suppression
of Electrical Equipment and Systems
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1740A/1750A/1760 – Series Service Manual i
Contents
Specifications
Specification 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics Tables 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Information
Installation 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Installation 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Installation 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Panel Connectors 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Connector 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Connector Converter 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS232 Connector 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Software 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Procedure for Loading Software 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration of New Features 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Recovery Procedure for Power Loss During Upgrade 2–20. . . . . . . . . . . . . .
Operating Instructions 2–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started 2–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Instructions 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Menu Information 2–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview 2–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying a Signal 2–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation
Block Diagram Description 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram 1 Input and Waveform Monitor 3–1. . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram 2 Vector – SCH – Component 3–4. . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram 3 Microprocessor and Line Rate Controller 3–6. . . . . . . . . . . . . . . .
Circuit Theory 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams 1 & 2 Channel A and Channel B Inputs 3–9. . . . . . . . . . . . . . . . . . . . . . .
Diagram 3 Vertical Input 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 4 Vertical Output 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 5 Horizontal 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 6 Microprocessor 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 7 Dynamic Control 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 8 Readout 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 9 DACS & Serial 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 10 Remote & 1760–Series / XROM Bus Connectors 3–17. . . . . . . . . . . . . .
Diagram 11 Z-Axis & Control 3–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 12 Front Panel 3–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 13 DACS & Digital Control 3–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 14 Subcarrier Regenerator 3–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 15 Phase Shifter 3–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 16 Demodulator 3–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 17 Internal SCH 3–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Contents
ii 1740A/1750A/1760 – Series Service Manual
Diagram 18 Reference SCH 3–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 19 Component Inputs, Transcoders, & RGB Outputs 3–29. . . . . . . . . . . . . .
Diagram 20 Component Control and Switching 3–30. . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 21 Low Voltage Power Supply 3–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 22 High Voltage Power Supply 3–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagram 23 XROM 3–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification
Performance Verification 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Equipment List 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Check Procedure Short-Form Reference 4–7. . . . . . . . . . . . . . . . . . . .
Performance Check Procedure 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Procedures
Adjustment Procedure 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Equipment List 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started 5–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description of PC Display 5–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Board Adjustment Locations 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform Illustrations 5–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
Maintenance 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Options 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tektronix Service 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing and Cleaning the Air Filter 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Visual Inspection 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Static-Sensitive Components 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Determining the Software Version 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Checks and Readjustments 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . .
General Troubleshooting Techniques 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Fuse Replacement 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specific Troubleshooting Techniques 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Procedure 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Volts Supply 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Volts Supply 6–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Corrective Maintenance 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tektronix Service Offerings 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Factory Replacement Parts 6–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Etched Circuit Boards 6–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Major Assembly Interconnection 6–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Disassembly/Assembly 6–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Contents
1740A/1750A/1760 – Series Service Manual iii
Bezel Removal 6–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graticule Light Removal and Replacement 6–20. . . . . . . . . . . . . . . . . . . . . . . . .
CRT Removal 6–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement of the CRT 6–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Rear Panel and the Input and BNC Circuit Boards 6–24. . . . . . . .
Removing the Front Panel and the Front Panel Circuit Board 6–26. . . . . . . . . . .
Removing the Main Board 6–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Power Supply Board 6–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Vector Board 6–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the SCH Board (1750A–Series & 1760–Series Option SC only) 6–31
Removing the XROM Board (1740A–Series & 1750A–Series only) 6–31. . . . .
Removing the Component Board (1760–Series only) 6–32. . . . . . . . . . . . . . . . .
Repackaging 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Identification Tag 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repackaging for Shipment 6–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options
Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Orderable Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cord Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CRT Options 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cabinets 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Plain Cabinet (1700F00) 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Carrying Case (1700F02) 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side-by-Side Rack Adapter (1700F05) 7–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blank Panel (1700F06) 7–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Utility Drawer (1700F07) 7–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering 7–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Parts List
Diagrams
Mechanical Parts List
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Glossary-1
Index Index–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Information
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Contents
iv 1740A/1750A/1760 – Series Service Manual
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Contents
1740A/1750A/1760 – Series Service Manual v
List of Figures
Figure 2–1: Dimensions of the 1700F00 plain cabinet 2–2. . . . . . . . . . . . . . .
Figure 2–2: 1700F02 portable cabinet 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–3: Rear view showing the securing screws 2–4. . . . . . . . . . . . . . . .
Figure 2–4: The 1700F05 side-by-side rack adapter 2–5. . . . . . . . . . . . . . . . .
Figure 2–5: A1700F05 with a blank front panel (1700F06) 2–5. . . . . . . . . . .
Figure 2–6: 1700F05 rack mounting with a 1700F07 utility drawer 2–6. . . .
Figure 2–7: Custom installation of an instrument 2–7. . . . . . . . . . . . . . . . . . .
Figure 2–8: Rear panel connectors 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–9: Rear panel REMOTE connector. 2–10. . . . . . . . . . . . . . . . . . . . . .
Figure 2–10: Replacement adapter for 1740/1750 2–12. . . . . . . . . . . . . . . . . .
Figure 2–11: Rear panel RS232 connector 2–13. . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–12: Hookup for 9-Pin PC Connector 2–15. . . . . . . . . . . . . . . . . . . . .
Figure 2–13: Alternate Hookup for 9-Pin PC Connector 2–15. . . . . . . . . . . . .
Figure 2–14: RS232 cable standard and alternate hookups for
25-Pin PC Connector 2–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–15: Location of XROM circuit board with PAD 1 showing 2–18. . .
Figure 2–16: 1760 front panel 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–17: The CRT menu, with the bezel controls and buttons 2–23. . . . . .
Figure 3–1: NTSC line count (U24) & color frame 1 SCH Field Pulse 3–28. .
Figure 3–2: PAL line count (U24) & color frame 1 SCH Field Pulse 3–28. . .
Figure 4–1: External Horizontal or RGB/YRGB Cable Adapter 4–5. . . . . . .
Figure 4–2: Remote Sync Cable Adapter 4–5. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–3: Audio and Timecode Cable Adapter 4–6. . . . . . . . . . . . . . . . . . .
Figure 4–4: Timing Cursor Check 4–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–5: Fast DC Restorer Response 4–25. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–6: R–Y Display 4–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–7: Audio Display 4–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–8: Option Blanking Pulse 4–39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–9: Bowtie Common Mode Rejection Ratio 4–40. . . . . . . . . . . . . . . .
Figure 5–1: External Horizontal/RGB and YRGB Cable Adapter 5–5. . . . . .
Figure 5–2: Remote Sync Cable Adapter 5–5. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–3: Audio and Timecode Cable Adapter 5–6. . . . . . . . . . . . . . . . . . .
Figure 5–4: RS232 cable standard and alternate hookups for 9-Pin
PC Connector. 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–5: RS232 cable standard and alternate hookups for 25-Pin
Connector. 5–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Contents
vi 1740A/1750A/1760 – Series Service Manual
Figure 5–6: Typical Adjustment Procedures PC screen display 5–11. . . . . . . .
Figure 5–7: A1 Power Supply Board. 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–8: A3 Main Board. 5–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–9: A5 Vector Board. 5–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–10: A6 SCH Board. 5–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–11: A7 Component Board. 5–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5–12: Adjusting for thinnest Luminance Step 5–16. . . . . . . . . . . . . . . .
Figure 5–13: Matching Flat and Luminance Filter responses 5–16. . . . . . . . . .
Figure 5–14: Adjusting the NTSC SCH on the oscilloscope 5–17. . . . . . . . . .
Figure 5–15: Matching the SCH dot flipping points 5–17. . . . . . . . . . . . . . . . .
Figure 5–16: Adjusting the Option Blanking Pulse 5–18. . . . . . . . . . . . . . . . . .
Figure 5–17: Adjusting for minimum Bowtie amplitude 5–18. . . . . . . . . . . . .
Figure 5–18: Adjusting Diamond Display phase 5–19. . . . . . . . . . . . . . . . . . .
Figure 6–1: Instrument etched circuit board assemblies 6–16. . . . . . . . . . . . . .
Figure 6–2: Multiple pin connectors 6–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–3: CRT bezel removal 6–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–4: Replacing graticule light bulbs 6–21. . . . . . . . . . . . . . . . . . . . . . .
Figure 6–5: Removing the CRT 6–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6–6: Removing the rear panel and Input/BNC assembly 6–24. . . . . . . .
Figure 6–7: Disassembling Input/BNC assembly A4/A4–A1 6–25. . . . . . . . .
Figure 6–8: Removing the front-panel assembly 6–26. . . . . . . . . . . . . . . . . . .
Figure 6–9: Front Panel circuit board assembly 6–27. . . . . . . . . . . . . . . . . . . .
Figure 6–10: Screws holding the Main circuit board in place 6–28. . . . . . . . .
Figure 6–11: Securing screws for the Power Supply circuit 6–29. . . . . . . . . . .
Figure 6–12: Mounting hardware for Vector and SCH circuit boards 6–30. . .
Figure 6–13: Mounting hardware for the XROM circuit board 6–31. . . . . . . .
Figure 6–14: Component circuit board mounting hardware 6–32. . . . . . . . . . .
Figure 6–15: Repackaging a 1740A/1750A/1760–Series instrument. 6–33. . .
Figure 7–1: The 1700F00 metal cabinet 7–3. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7–2: The 1700F02 portable carrying case 7–4. . . . . . . . . . . . . . . . . . .
Figure 7–3: A1700F05 with two half rack (1700-Series) instruments 7–4. . .
Figure 7–4: A1700F05 with a blank front-panel (1700F06) 7–5. . . . . . . . . . .
Figure 7–5: 1700F05 rack mounting with a 1700F07 utility drawer 7–6. . . .
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Contents
1740A/1750A/1760 – Series Service Manual vii
List of Tables
Table 1–1: Waveform Vertical Deflection 1–3. . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: External Reference 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–3: Waveform Horizontal Deflection 1–6. . . . . . . . . . . . . . . . . . . . . .
Table 1–4: Measurement Cursors 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–5: RGB/YRGB 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–6: Calibrator 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–7: Vector Mode 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–8: Audio Mode 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–9: Time Code 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–10: SCH Phase Mode(1750-Series and 1760 OPT SC only) 1–10. . .
Table 1–11: Component Vector Mode (1760-Series only) 1–11. . . . . . . . . . . .
Table 1–12: Lightning Mode (1760-Series only) 1–11. . . . . . . . . . . . . . . . . . .
Table 1–13: Bowtie Mode (1760-Series only) 1–11. . . . . . . . . . . . . . . . . . . . .
Table 1–14: Transcoded GBR Outputs 1–12. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–15: CRT Display 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–16: Power Source 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–17: Environmental Characteristics 1–13. . . . . . . . . . . . . . . . . . . . . . .
Table 1–18: Certification 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–19: Physical Characteristics 1–14. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–1: Power Cord Options 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–2: Remote Connector 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–3: The available display modes 2–25. . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–1: Transcoder Signal Mixing 3–29. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–2: Component Display Output Switching 3–31. . . . . . . . . . . . . . . . . .
Table 4–1: Short-Form Performance Check 4–7. . . . . . . . . . . . . . . . . . . . . . .
Table 4–2: Vector Cursor Readout Values 4–18. . . . . . . . . . . . . . . . . . . . . . . .
Table 4–3: Audio and Timecode Values 4–33. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–1: Static Susceptibility 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–2: Power Supply Fault Symptoms 6–7. . . . . . . . . . . . . . . . . . . . . . .
Table 6–3: Low Volts Supply Voltages 6–7. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–4: Control Circuit Test Points 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–5: Shut Down Logic Levels 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 6–6: High Volts Supply Fault Symptoms 6–11. . . . . . . . . . . . . . . . . . . .
Table 6–7: High Voltage Oscillator Test Points 6–12. . . . . . . . . . . . . . . . . . . .
Table 6–8: 1740A/1750A/1760–Series Replacement Circuit Boards 6–14. . .
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Contents
viii 1740A/1750A/1760 – Series Service Manual
Table 6–9: Etched Circuit Board Assemblies 6–17. . . . . . . . . . . . . . . . . . . . . .
Table 6–10: Main Board Plug Connections 6–27. . . . . . . . . . . . . . . . . . . . . . .
Table 7–1: Power Plugs Available for These Instruments 7–2. . . . . . . . . . . .
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1740A/1750A/1760 – Series Service Manual ix
Safety Summary
This summary contains general safety information for operating and servicing
personnel. Specific warnings and cautions are given throughout the manual
where they apply, but may not appear in this summary.
Terms
In this manual
CAUTION statements identify conditions or practices that can damage the
equipment or other property.
WARNING statements identify conditions or practices that can cause injury or
loss of life.
As marked on equipment
CAUTION indicates an injury hazard not immediately accessible as one reads
the marking, or a hazard to the equipment or other property.
DANGER indicates an injury hazard immediately accessible as one reads the
marking.
Symbols
In this manual
ÁÁÁÁ
Á
ÁÁ
Á
Á
ÁÁ
Á
ÁÁÁÁ
!
ÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁ
This symbol shows where applicable
cautionary or other information is to
be found.
As marked on the equipment
ÁÁÁÁ
Á
ÁÁ
Á
Á
ÁÁ
Á
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁ
DANGER — High voltage.
ÁÁÁÁ
Á
ÁÁ
Á
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁ
Protective ground (earth) terminal.
ÁÁÁÁ
Á
ÁÁ
Á
Á
ÁÁ
Á
ÁÁÁÁ
!
ÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁ
ATTENTION — refer to manual.
Power source
This product is intended to operate from a power source that applies no more
than 250 volts RMS between the supply conductors or between either supply
conductor and ground.
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Safety Summary
x1740A/1750A/1760 – Series Service Manual
Ground the product
This product is grounded through the grounding conductor of the power module
power cord. To avoid electrical shock, plug the power cord into a properly wired
receptacle before connecting to the product input or output terminals. A protec-
tive ground connection by way of the grounding conductor in the power cord is
essential for safe operation.
Danger arising from loss of ground
If the protective connection to ground is lost, all accessible conductive parts (in-
cluding knobs and controls that may appear to be insulated) can render an elec-
tric shock.
Use the proper fuse
Use only the fuse of correct type, voltage rating, and current rating, as specified
in the parts list for the product. Refer fuse replacement to qualified personnel.
Do not operate in an explosive atmosphere
Do not operate this product in an explosive atmosphere unless it has been specif-
ically certified for such operation.
Do not operate without covers
To avoid injury, do not operate the product without its covers and panels proper-
ly installed.
Do not service alone
Do not service or adjust this product unless another person capable of rendering
first aid and cardio–pulmonary resuscitation is present.
Power supply shield
The plastic shield on the power supply board is required for protection from dan-
gerous voltages that are present on the board. This shield must be in place at all
times when operating the instrument.
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xi
1740A/1750A/1760 – Series Service Manual
Preface
This manual provides servicing information for the 1740A/1750A/1760–Series
of instruments. Material found in this volume is targeted at the service techni-
cian; operating information, tailored to the specific family member, can be found
in that instrument’s “User” manual.
To date there are three manuals available for this family of instruments. This
Service Manual applies to all instruments in the family. There is a User manual
for the 1740A–Series and 1750A–Series. (The 1750A is identical to the 1740A
with the exception of SCH Phase measurements in the 1750A–Series.) A
different User manual is supplied with the 1760-Series. The 1760-Series adds
component analog measurement capability to the basic 1740A-Series, while the
1760-Series Option SC adds the same component analog measurement capability
to a 1750A-Series instrument.
Service Level Supported This manual supports both Module Level (for module
exchange) and Component Level servicing. Module Level servicing utilizes the
block diagram and its descriptions to isolate a problem to the circuits on a
particular etched circuit board. To support Component Level servicing there is
additional theory of operation, schematic diagrams and circuit board parts
locating illustration and cross reference indexes (part location charts) for each
circuit board.
When contemplating the level of servicing that is appropriate for a specific
facility, please consider the fact that this instrument contains etched circuit
boards that utilize surface mount technology. Surface mounted components are
not soldered to the circuit board in the traditional manner, they require special
techniques and tools to remove and re-install.
Specific Content Much of the information in this manual is shared with the User
manual; however, the depth of the material depends on the potential use. A
quick comparison will reveal that there are installation instructions in both
manuals, along with specifications, servicing, and operating instructions.
The installation instructions in both manuals are nearly identical. Installation of
this instrument is so straight forward that anyone can install the instrument in its
operating environment.
The operating instructions in the User manual are much more detailed than those
in the Service manual. The need for a service technician is considerably less
than that of an end user. If the operating instructions in this manual are not
complete enough, please refer to the User manual for more detailed instructions.
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Preface
xii 1740A/1750A/1760 – Series Service Manual
The specifications contained in the Specification section of this manual should
be used by the servicing technician. Its tables contain Performance Verification
step numbers to make it possible to document the test methods used to verify the
accuracy of the instrument.
The User manual contains some servicing instructions for quick, non dangerous
operations; however, the bulk of the servicing instructions are located in this
manual. Note that there are specific procedures for troubleshooting and
disassembly in this manual, they should only be attempted by competent service
technicians. Items in the maintenance section contain both Warnings and
Cautions that should be read and followed when performing maintenance on the
1740A/1750A/1760-Series of instruments.
The last sections of this manual contain the Replaceable Parts Lists, Circuit
Board Illustrations, and Schematic Diagrams needed to isolate and replace faulty
components. Note that replacement part ordering information can be found in
the Maintenance section of this manual.
Readjustment These instruments are designed to be returned to operation within
stated specifications through a PC-based adjustment procedure. The disk holder
for this manual contains two computer disks: 1. A software disk containing
instruments operating software (Version 2.2 or greater). 2. A calibration
software disk.
An IBM compatible personal computer (PC) with a DOS 3.3 or higher operating
system, and a 31/2inch high density floppy drive is required to perform the
readjustment procedure or reload the operating software.
The spare software disk is provided in the event that the Main circuit board,
which contains the software, requires replacement. In all cases the operating
software must be Version 2.2 or above to perform the Readjustment Procedure.
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