Tektronix 1740A/1750A Service Manual

Preface

Service Manual

Topics covered in the service manual are as follows:

Specifications

Operating Information

Theory of Operation

Performance Verification

Adjustment Procedures

Maintenance

Options

Electrical Parts List

Diagrams

Mechanical Parts List

xii	1740A/1750A Series Waveform/Vector Monitor User Manual

Contents

User Manual 1740A/1750A Series Waveform/Vector Monitor This document supports firmware version 2.2 and above www.tektronix.com General Safety Summary To Avoid Fire or Personal Injury Safety Terms and Symbols Page TABLE OF CONTENTS Page Making Measurements Appendices Appendix A Appendix B Remote Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 Remote Connector Converter . . . . . . . . . . . . . . . B-4 LIST OF FIGURES Two-FieldSC/H R--Ydisplay (PAL) Audio displays Figure B-1 Rear panel REMOTE connector B-1 Preface User Manual Service Manual Page Introduction Page Product Description Applications Features Description of Features More Information Page Options Power Cord Options CRT Options Accessories Standard Accessories Optional Accessories Field Upgrade Kits Installation Electrical Installation WARNING Mains Frequency and Voltage Range Remote Connector RS232 Connector The RS232 interface is not supported at the time of this printing Operational Changes Mechanical Installation Rackmounting Instrument Configuration Getting Started AT A GLANCE Front-PanelControls HTurn off instrument power Depress and hold the Multi-UseControls Series 1740A/1750A 1740A .2-2Figure .Panel Front Manual User Monitor 1740A 1750A POSITION DISPLAY HWAVEFORM provides voltage vs. time display of the video signal HVECTOR presents an XY plot of demodulated chromi- nance phase and amplitude HPICTURE allows the operator to verify the signal source REF MENU HFILTER allows choice of flat or filtered display of the waveform signal HLIN SEL allows the selection of a single line or group of lines for display HGAIN provides selection of X1, X5, X10, and variable gain HCRT menu allows adjustment of CRT focus, signal intensity, and trace rotation Rear-PanelConnectors Fuse AC Power Fan Filter OUT PIX EXT REF Figure 2-4.1740A/1750A ---SeriesRear Panel Operator’s Checkout Procedure Procedure Exit the CRT menu. The changes made while in the menu remain in effect 3. Input Channel Selection The CH-Asignal should appear on the left side of the CRT 4. Check Gain 10S/DIV 5. Gain Control 6. Select Timing Reference Press the MAG button. The MAG indicator lights and a 7. Voltage and Timing Cursors point on the signal (use the control if needed to view the cursor) Page Page Page Page Figure 2-12. Two-FieldSC/H R ---Ydisplay (PAL), showing proper SCH phase 9. Line Selection Line select is available in the following display modes: (1750A-Series only), and Page Page 12. Audio Display 13. SCH Display (1750A Only) This concludes the Operator’s Checkout Procedure Operation Basics Functional Overview Display Modes Audio SCH Picture Displaying a Signal Parade Overlay Sweep Using the Menus General Menu Information Clear Menu Exiting a Menu Function Filter Menu (WAVEFORM Mode Only) Cursor Menu Waveform Cursor Control When markers are selected When both voltage and timing cursors are selected Using the Cursors Page With Waveform Display Line Select Menu When bezel buttons corresponding to are pushed, a box flashes momentarily around the label to verify that the selection has been made Readout Line Select Functions Preset Menu Recall Recover Store Rename Configure Menu Figure 3-6.The CONFIGURE menu display with INPUT selected FORMAT is also used to select The present selection will be dis- played when the front-panel button is pressed STANDARD For OFFSET While the offsets are enabled, the When both An offset will remain in effect until the user turns the offset CALIBRATE Additional choices appear when CAL SIG or GAIN CAL is turned on: CAL SIG ON HIn waveform mode, the user can set the calibrator frequency to or to REMOTE HThe remote input is enabled by a TTL low or switch to ground. See page B-1 REFERENCE (Dual Standard Only) REFERENCE HNTSC external reference and PAL external refer Gain Menu CRT Menu Remote Operation Making Measurements Basic Measurements Waveform Graticule NTSC Vertical Scales PAL Vertical Scale Dual-StandardVertical Scale Making Waveform Measurements Make sure that the center of the bar is at 100 IRE (1 Volt Vector Graticule Dual-Standard Making Vector Measurements Making SC/H Phase Measurements Figure 4-6.NTSC dual-dotSC/H display Figure 4-7.NTSC single-dotSC/H display PAL SC/H R---Y Page Page Making Audio Measurements Time Code Display Calibration Adjusting Instrument Gain Set Horizontal Gain To set horizontal gain, push the , adjust the Set Vector Gain Adjust Appendices Appendix A Performance Specification Electrical Specifications Table A- 1: Waveform Vertical Deflection A-2 Table A- 1: Waveform Vertical Deflection (Cont.) A-3 A-4 Table A- 2: External Reference A-5 Table A- 3: Waveform Horizontal Deflection A-6 Table A- 4: Measurement Cursors Table A- 5: RGB/YRGB A-7 Table A- 6: Calibrator Table A- 7: Vector Mode A-8 Table A- 7: Vector Mode (Cont.) A-9 Table A- 8: Audio Mode DC coupled, differential input Input Impedance 20 kΩ Full Scale Selection Table A- 10: SCH Phase Mode (1750-SeriesOnly) Table A- 11: CRT Display A-11 Table A- 12: Power Source Table A- 13: Environmental Characteristics A-12 Table A- 14: Physical Characteristics Certifications and Compliances Table A- 15: Certifications and compliances EC Declaration of Meets intent of Directive 89/336/EEC for Electromagnetic Conformity --EMC Table A- 15: Certifications and compliances (cont.) Installation Terminals on this product may have different installation (Overvoltage) Category Safety Standards U.S. Nationally UL1244 Recognized Testing Laboratory Listing Appendix B Remote Connectors Remote Connector Page Grounding pin 19 recalls setup and 25 stores current setup at preset Grounding pin 20 recalls setup Grounding pin 21 recalls setup Remote Connector Converter Figure B-3.Rear panel RS232 connector Appendix C User Service Cleaning or Replacing the Fan Filter Fuse Replacement Graticule Light Replacement 6.Replace the five knobs below the CRT and tighten the set screws Cleaning Replacing the CRT Filter 6.Replace the bezel and bezel screws. Tighten screws (8 in lbs) 8.Replace the five knobs below the CRT and tighten the set screws C-6 Appendix D Software Version Table D-1.Software Releases (Continued) D-2 Glossary Glossary Burst (PAL) dB (Decibel) Gamma (NTSC) Gamma (PAL) Gen Lock Graticule Horizontal Blanking Horizontal Sync Hue Luminance Modulated (NTSC) Modulated (PAL) Modulation Non-Linear Quadrature Distortion RGB R-Y Saturation SCH Subcarrier Synchronous Detection Termination Time Code, Longitudinal (LTC) Time Code, Vertical (VITC) Vertical Interval Index Index Index