Tektronix 2430 Manuale utente

Tektronix

Service Manual

2430

Digital Oscilloscope

070-4917-00

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

performingservice.

Please check for change information at the rear

of this manual.

First Edition: May 1986

Last Revised: September 1994

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes

that in all previously published material. Specifications and price change privileges reserved.

Printed in the U.S.A.

Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

CONTROL SETUP 4-4

VERTICAL SYSTEM 4-5

TRIGGERING SYSTEM 4-16

HORIZONTAL SYSTEM 4-23

ADDITIONAL VERIFICATIONS

AND CHECKS 4-26

INITIAL FRONT PANEL

Section 4 PERFORMANCECHECK AND

FUNCTIONAL VERIFICATION

PROCEDURE

INTRODUCTION 4-1

PREPARATION 4-1

Page

FRONT PANEL PROCESSOR 3-26

FRONT PANEL CONTROLS 3-28

SYSTEM DAC AND ACQUISITION

CONTROL REGISTERS 3-29

SYSTEM DAC (cont) AND

AUXILIARY FRONT PANEL. 3-31

SYSTEM CLOCKS 3-33

TIME BASE CONTROLLER

AND ACQUISITION MEMORY 3-37

ATIENUATORS AND

PREAMPLIFIERS 3-41

PEAK DETECTORS AND

CCD/CLOCK DRIVERS 3-43

TRIGGERS AND PHASE CLOCKS 3-49

JITIER CORRECTION RAMPS 3-54

TRIGGER HOLDOFF, JITIER

COUNTERS, AND CALIBRATOR 3-56

CCD OUTPUT 3-59

A/D CONVERTER AND

ACQUISITION LATCHES 3-60

DISPLAY AND ATIRIBUTES

MEMORY 3-61

DISPLAY CONTROL 3-64

DISPLAY OUTPUT 3-71

HIGH VOLTAGE POWER

SUPPLY AND CRT 3-73

SYSTEM

1/0

3-78

VIDEO OPTION 3-82

LOW VOLTAGE POWER SUPPLY 3-90

LOW VOLTAGE REGULATORS 3-96

Section 3 THEORYOF OPERATION

SECTION ORGANIZATION.................. 3-1

INTEGRATED CIRCUIT

DESCRIPTIONS 3-1

SIMPLIFIED BLOCK DIAGRAM

DESCRIPTION 3-2

DETAILED BLOCK DIAGRAM

DESCRIPTION 3-8

INTRODUCTION................................... 3-8

INPUT SIGNAL CONDITIONING

AND ANALOG SAMPLING 3-8

ACQUISITION PROCESS

AND CONTROL 3-10

DATA CLOCKING TO

ACQUISITION MEMORY 3-10

ANALOG DATA CONDITIONING

AND A/D CONVERSION 3-11

ACQUISITION PROCESSING

AND DISPLAY 3-12

DETAILED CIRCUIT

DESCRIPTION 3-15

SYSTEM PROCESSOR 3-15

WAVEFORM PROCESSOR

SYSTEM 3-21

Section 2 PREPARATION FOR USE

SAFETY 2-1

LINE VOLTAGE SELECTION 2-1

LINE FUSE 2-1

POWER CORD 2-3

INSTRUMENT COOLlNG..................... 2-3

OPERATING INFORMATION............... 2-3

START-UP............................................ 2-3

POWER-DOWN............................... 2-4

REPACKAGING FOR SHIPMENT 2-4

Section 1 SPECIFICATION

INTRODUCTION................................... 1-1

PERFORMANCE CONDITIONS 1-2

Page

LIST OF ILLUSTRATIONS........................................... iii

LIST OF TABLES.........................................................

OPERATORSSAFETY SUMMARY............................. vi

SERVICINGSAFETY SUMMARY................................ vii

TABLE OF CONTENTS

2430 Service

REV DEC 1986

Diagnostic and Troubleshooting Information:

Diagnostics 6-25

Diagnostic Operation 6-30

Diagnostic Procedures.................................... 6-32

2430 Troubleshooting Procedures Table...... 6-35

Video Option Troubleshooting Table ......•..... 6-99

Troubleshooting Charts ..................•.........•.....Section 9

CHANGE INFORMATION

INDEX

Section 10 REPLACEABLE MECHANICAL PARTS

Section 9 DIAGRAMS

Section 8 REPLACEABLE ELECTRICAL PARTS

Section 7 OPTIONS AND ACCESSORIES

OPTIONS DESCRIPTION 7-1

OPTIONS A1-A5-INTERNATIONAL

POWER CORDS 7-1

OPTION 1R-RACKMOUNTED

2430 7-1

OPTION 05-VIDEO OPTION 7-1

OPTION 11-PROBE POWER............ 7-2

OPTIONAL WORD RECOGNIZER

PROBE ACCESSORY.......................... 7-2

STANDARD ACCESSORIES............... 7-2

RACKMOUNTING ACCESSORIES..... 7-2

OPTIONAL ACCESSORIES................. 7-2

Page

DIAGNOSTICS 6-25

CALIBRATION AND

DIAGNOSTICS 6-25

CALIBRATION/DIAGNOSTICS

OPERATION 6-30

DIAGNOSTICS OPERATION

VIA THE GPIB INTERFACE 6-32

DIAGNOSTIC PROCEDURES 6-32

Section 6 MAINTENANCE

CALIBRATION IN THE 2430

DIGITAL OSCILLOSCOPE................... 6-1

NATIONAL BUREAU OF

STANDARDS TRACEABILITY 6-2

VOIDING CALIBRATION...................... 6-2

STATIC-SENSITIVE COMPONENTS....... 6-3

PREVENTIVE MAINTENANCE.. 6-4

INTRODUCTION................................... 6-4

GENERAL CARE 6-4

INSPECTION AND CLEANING 6-4

LUBRICATION...................................... 6-6

SEMICONDUCTOR CHECKS.............. 6-6

PERIODIC READJUSTMENT 6-6

TROUBLESHOOTING............................... 6-7

INTRODUCTION................................... 6-7

TROUBLESHOOTING AIDS 6-7

TROUBLESHOOTING

EQUIPMENT 6-9

TROUBLESHOOTING

TECHNIQUES....................................... 6-9

CORRECTIVE MAINTENANCE 6-11

INTRODUCTION 6-11

MAINTENANCE PRECAUTIONS......... 6-11

OBTAINING REPLACEMENT

PARTS 6-11

SELECTABLE COMPONENTS 6-12

MAINTENANCE AIDS 6-12

INTERCONNECTIONS 6-14

TRANSISTORS AND

INTEGRATED CIRCUITS 6-14

SOLDERING TECHNIQUES 6-14

REMOVAL AND REPLACEMENT

PROCEDURE 6-15

Section 5 ADJUSTMENT PROCEDURE

INTRODUCTION 5-1

CALIBRATION SEQUENCE AND

PARTIAL PROCEDURES 5-1

WARM-UP TIME REQUIREMENT 5-1

PRESERVATION OF INSTRUMENT

CALIBRATION...................................... 5-2

INTERNAL ADJUSTMENTS 5-3

SELF CALIBRATION 5-10

EXTERNAL CALIBRATION 5-11

Page

TABLE OF CONTENTS (cont)

2430 Service

iii

6-1 Multipin connector 6-8

6-2 2430 circuit boards 6-16

6-3 Installation sequence for installing the crt frame screws 6-23

6-4 Main EXT DIAG menu 6-27

6-5 Trigger LED binary coding for diagnostic tests.......................................................................... 6-28

6-6 Initial troubleshooting

chart

6-34

6-7 Mux Test waveforms 6-39

6-8 Typical Register test waveforms 6-51

6-9 Front Panel ~P diagnostics test... 6-75

6-10 System ~P data bit 07 in the Bus Isolate mode 6-97

5-1 Adjustment locations for Displays 4 through 6 5-4

5-2 Display 5-Vertical and Horizontal Gain, Offset. and Vector

Compensation adjustment pattern 5-5

5-3 Display 6-lntegrator Time adjustment pattern 5-6

3-1 2430 simplified block diagram..................................................................................................... 3-3

3-2 Simplified Memory Map of the 2430 3-18

3-3 System Clock waveforms............................................... 3-35

3-4 Simplified Peak Detector block diagram............................................... 3-45

3-5 Simplified CCD architecture 3-47

3-6 Trigger Logic Array Control Data Byte 3-51

3-7 Jitter correction waveforms 3-55

3-8 Readout State Machine flow chart 3-69

3-9 Vertical Vector Generator 3-71

3-10 DC Restorer 3-76

3-11 GPIB data flow diagram 3-79

3-12 GPIB three-wire handshake state diagram 3-80

3-13 Video Option waveforms 3-85

3-14 Video Option field-sync identification..................................... 3-86

3-15 PWM Regulator and Inverter 3-92

3-16 PWM switching waveforms 3-94

2-1 LINE VOLTAGE SELECTOR. line fuse. and power cord receptacle 2-1

1-1 Dimensional drawing 1-20

Figure Page

The 2430 Digital Oscilloscope............................................................................................. viii

LIST OF ILLUSTRATIONS

2430 Service

9-1 Colorcodesfor resistorsandcapacitors.

9-2 Semiconductorleadconfigurations.

9-3 Locatingcomponentson schematicdiagramsandcircuitboardillustrations.

9-4a Detailed2430BlockDiagram.

9-4b Detailed2430BlockDiagram(cont).

9-5 A12-Processor Board.

9-6 A13-Side Board.

9-7 A14-Front PanelBoard.

9-B A1O-Main Board.

9-9 A11- Timebase/DisplayBoard.

9-10 A17-High VoltageBoard.

9-11 A16-Low VoltagePowerSupplyBoard.

Figure

LIST OF ILLUSTRATIONS (cont)

2430 Service

6-1 Relative Susceptibility to Static-Discharge Damage................................................................ 6-3

6-2 External Inspection Check List................................................................................................. 6-5

6-3 Internal Inspection Check List 6-6

6-4 Power Supply Voltage and Ripple Limits 6-10

6-5 Maintenance Aids 6-13

6-6 2430 Troubleshooting Procedures...................................................................................... 6-35

6-7 Video Option Troubleshooting 6-99

6-8 INIT PANEL States 6-103

4-8

4-17

4-19

4-2

3-57

3-59

3-19

3-20

3-21

3-25

3-50

3-52

3-53

2-2

Page

1-3

1-15

1-17

1-18

2430 Service

Test Equipment Required .

Accuracy Limits CH 1 and CH 2 CURSOR VOLTS Readout and A and

B TRIGGER LEVEL Readouts .

Minimum Display Level for CH 1 or CH 2 Triggering .

Minimum Signal Level for EXT1 or EXT2 Triggering .

Host Memory-Mapped

1/0 .

Processor Control Register Functions .

Processor Miscellaneous Register (PMREG)Output Functions .

Waveform I-LPAddress Decoding .

Trigger Logic Array Addresses (6080h-6087h) .

REF4/5 Frequency for Each SEC/DIV Setting .

Phase Clock Array Control Lines (CC3 through CCO) .

Holdoff Delay Range for Current Source vs Charging Capacitor

Combinations .

Side Board Address Decoding .

Voltage, Fuse, and Power-Cord Data .

Electrical Characteristics .

Environmental Characteristics .

Mechanical Characteristics .

Option 05 (TV Trigger) Electrical Characteristics .

LIST OF TABLES

4-3

4-4

4-1

4-2

3-9

3-1

3-2

3-3

3-4

3-5

3-6

3-7

3-8

2-1

Table

1-1

1-2

1-3

1-4

To avoid personal injury, the instrument covers or panels

should only be removed by qualified service personnel. Do

not operate the instrument without covers and panels

properly installed.

Do Not Remove Covers or Panels

Do Not Operate in Explosive Atmospheres

To avoid explosion, do not operate this instrument in an

atmosphere of explosive gasses.

Use the Proper Fuse

To avoid fire hazard, use only the fuse specified in the

instrument parts list. A replacement fuse must meet the

type, voltage rating, and current rating specifications for

the fuse that it replaces.

Use the Proper Power Cord

Use only the power cord and connector specified for the

instrument.

Danger AriSing from Loss of Ground

Upon loss of the protective-ground connection, all accessi-

ble conductive parts (including knobs and controls that

may appear to be insulated) can render an electric shock.

Grounding the Product

This product is grounded through the grounding conductor

of the power cord. To avoid electrical shock, plug the

power cord into a properly wired receptacle before making

any connections to the product input or output terminals.

A protective ground connection by way of the grounding

conductor in the power cord is essential for safe operation.

Power Source

This product is intended to operate from a power source

that will not apply more than 250 volts rms between the

supply conductors or between either supply conductor and

ground. A protective ground connection by way of the

grounding conductor in the power cord is essential for safe

operation.

ATIENTION - Refer to manual.

@Protective gound (earth) terminal.

DANGER - High voltage.

Symbols as Marked on Equipment

Symbols in This Manual

This symbol indicates where applicable cau-

tionary or other information is to be found. For

maximum input voltage see Table 1-1.

DANGER indicates a personal injury hazard immediately

accessible as one reads the marking.

Terms as Marked on Equipment

CAUTION indicates a personal injury hazard not immedi-

ately accessible as one reads the markings, or a hazard to

property, including the equipment itself.

WARNING statements identify conditions or practices that

could result in personal injury or loss of life.

Terms in This Manual

CAUTION statements identify conditions or practices that

could result in damage to the equipment or other property.

The general safety information in this part of the summary is for both operating and servicing personnel.

Specific warnings and cautions will be found throughout the manual where they apply and do not appear in this

summary.

OPERATORS SAFETY SUMMARY

2430 Service

vii

Power Source

This product is intended to operate from a power source

that does not apply more than 250 volts rms bwetween

the supply conductors or between either supply conductor

and ground. A protective ground connection by way of the

grounding connector in the power cord is essential for safe

operation.

Disconnect power before removing protective panels, sol-

dering, or replacing components.

Use Care When Servicing With Power On

Dangerous voltages exist at several points in this product.

To avoid personal injury, do not touch exposed connec-

tions or components while power is on.

Do not perform internal service or adjustment of this pro-

duct unless another person capable of rendering first aid

and resuscitation is present.

Do Not Service Alone

Refer a/so to the preceding Operators Safety Summary.

FOR QUALIFIED SERVICE PERSONNEL ONL Y

SERVICING SAFETY SUMMARY

2430 Service

viii

4917-01

The 2430 Digital OScilloscope.

2430 Service

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