Tektronix 2440 Manuale utente

TEK 070-6603-00

Product Group 37

2440

OSCILLOSCOPE

SERVICE

WARNING I

/the following servicing instructions are

*'for use by qualified personnel ONLY.- to

AVOID PERSONAL INJURY, DO NOT PERFORM ANY

SERVICING OTHER THAN THAT CONTAINED IN

OPERATING INSTRUCTIONS UNLESS YOU ARE

QUALIFIED TO DO SO. REFER TO OPERATORS

SAFETY SUMMARY AND SERVICE SAFETY SUM-

MARY PRIOR TO PERFORMING ANY SERVICE.

Please Check for

CHANGE INFORMATION

at the Rear of This Manual

First Printing JUL 1988

Revised JUN 1989 Tfektronix

COMMITTED TO EXCELLENCE

publication may not be reproduced in any form without the written

permission of Tektronix, Inc.

Products of Tektronix, Inc. and its subsidiaries are covered by U.S.

and foreign patents and/or pending patents.

TEKTRONIX, TEK, SCOPE-MOBILE, and

trademarks of Tektronix, Inc.

are registered

Printed in U.S.A. Specification and price change privileges are

reserved.

Instrument Serial Numbers

Each instrument has aserial number on apanel insert, tag, or

stamped on the chassis. The first number or letter designates the

country of manufacture. The last five digits of the serial number are

assigned sequentially and are unique to each instrument. Those

manufactured in the United States have six unique digits. The country

of manufacture is identified as follows:

BOOOOOO Tektronix, Inc., Beaverton, Oregon, USA

100000 Tektronix Guernsey, Ltd., Channel Islands

200000 Tektronix United Kingdom, Ltd., London

300000 Sony/Tektronix, Japan

700000 Tektronix Holland, NV, Heerenveen.The Netherlands

2440 Service

TABLE OF CONTENTS

Page

LIST OF ILLUSTRATIONS iii

LIST OF TABLES v

OPERATORS SAFETY SUMMARY vi

SERVICING SAFETY SUMMARY vii

Section 1SPECIFICATION

INTRODUCTION 1-1

PERFORMANCE CONDITIONS .. 1-4

Section 2PREPARATION FOR USE

SAFETY 2-1

LINE VOLTAGE SELECTION 2-1

LINE FUSE 2-1

POWER CORD 2-3

INSTRUMENT COOLING 2-3

START-UP !2-3

POWER-DOWN 2-4

REPACKAGING FOR SHIPMENT 2-4

Section 3THEORY OF 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 3-22

Page

FRONT PANEL PROCESSOR 3-28

FRONT PANEL CONTROLS 3-30

SYSTEM DAC AND ACQUISITION

CONTROL REGISTERS 3-31

SYSTEM DAC (cont) AND

AUXILIARY FRONT PANEL 3-33

SYSTEM CLOCKS 3-35

TIME BASE CONTROLLER

AND ACQUISITION MEMORY 3-39

ATTENUATORS AND

PREAMPLIFIERS 3-43

PEAK DETECTORS AND

CCD/CLOCK DRIVERS 3-45

TRIGGERS AND PHASE CLOCKS 3-51

JITTER CORRECTION RAMPS 3-56

TRIGGER HOLDOFF, JITTER

COUNTERS, AND CALIBRATOR 3-58

CCD OUTPUT 3-61

A/D CONVERTER AND

ACQUISITION LATCHES ,3-62

DISPLAY AND ATTRIBUTES

MEMORY 3-63

DISPLAY CONTROL 3-66

DISPLAY OUTPUT 3-73

HIGH VOLTAGE POWER

SUPPLY AND CRT 3-75

SYSTEM I/O 3-80

VIDEO OPTION 3-84

LOW VOLTAGE POWER SUPPLY 3-92

LOW VOLTAGE REGULATORS 3-98

Section 4PERFORMANCE CHECK AND

FUNCTIONAL VERIFICATION

PROCEDURE

INTRODUCTION 4-1

PREPARATION 4-1

INITIAL SETUP.... 4-4

VERTICAL SYSTEM 4-6

TRIGGERING SYSTEMS..... 4-18

HORIZONTAL SYSTEM 4-26

ADDITIONAL VERIFICATIONS

AND CHECKS 4-29

2440 Service

TABLE OF CONTENTS (cont)

Section 5ADJUSTMENT PROCEDURE Page

DIAGNOSTICS AND

Page

INTRODUCTION ..U.

CALIBRATION SEQUENCE AND ... 5-1 INTERNAL CALIBRATION

ROUTINES. ROR

PARTIAL PROCEDURES

... 5-1 INTRODUCTION ft OC

WARM-UPTIME REQUIREMENT...,... 5-1 OVERVIEW R-2R

PRESERVATION OF CALIBRATION ROUTINES

DIAGNOSTIC ROUTINES 6-25

—INSTRUMENT™ •

6-27

CALIBRATION ... 5-2 DIAGNOSTICS OPERATION

INTERNAL ADJUSTMENTS ... 5-3 VIA THE GPIB INTERFACE. 6-34

SELF CALIBRATION.... ,. 5-19 DIAGNOSTIC PROCEDURES 6-35

EXTERNAL CALIBRATION .. 5-20

Section 6MAINTENANCE

INSTRUMENT CALIBRATION 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

MAINTENANCE AIDS.... 6-12

INTERCONNECTIONS 6-12

TRANSISTORS AND

INTEGRATED CIRCUITS 6-12

SOLDERING TECHNIQUES 6-14

REMOVAL AND REPLACEMENT

PROCEDURE 6-15

Section 7OPTIONS AND ACCESSORIES

OPTIONS DESCRIPTION...

OPTIONS A1-A5—INTERNATIONAL

POWER CORDS .

OPTION 1R—RACKMOUNTED

2440

.. 7-1

7-1

OPTION 03—WORD

RECOGNIZER PROBE .7-2

OPTION 05—VIDEO OPTION .7-2

OPTION 11—PROBE POWER .7-2

STANDARD ACCESSORIES .7-2

RA'CKMOUNTING ACCESSORIES.....7-2

OPTIONAL ACCESSORIES.... .7-2

Section 8REPLACEABLE ELECTRICAL PARTS

Section 9DIAGRAMS

Section 10 REPLACEABLE MECHANICAL PARTS

CHANGE INFORMATION

Diagnostic and Troubleshooting information:

Diagnostics 6_25

Diagnostic Operation 6-30

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

2440 Troubleshooting Procedures Table 6-35

Video Option Troubleshooting Table 6-99

Troubleshooting Charts Section 9

2440 Service

LIST OF ILLUSTRATIONS

Figure Pa9®

The 2440 Digital Oscilloscope viii

1Dimensional drawing 1-24

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

12440 simplified block diagram 3-3

3-2 Simplified Memory Map of the 2440 3-18

3-3 System Clock waveforms 3-37

3-4 Simplified Peak Detector block diagram --3-47

3-5 Simplified CCD architecture —3-49

3-6 Trigger Logic Array Control Data Byte 3-53

3-7 Jitter correction waveforms 3-57

3-8 Readout State Machine flow chart 3-71

3-9 Vertical Vector Generator 3-73

3-10 DC Restorer 3-78

3-11 GPIB data flow diagram 3-81

3-12 GPIB three-wire handshake state diagram 3-82

3-13 Video Option waveforms 3-87

3-14 Video Option field-sync identification 3-88

3-15 'PWM Regulator and Inverter 3-94

3-16 PWM switching waveforms •• 3-96

5-1 Adjustment locations for Displays 4through 65-4

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

Compensation adjustment pattern 5-5

5-3 Display 6—Integrator Time adjustment pattern 5-6

5-4 (SN B010250 &Above) CH 1and CH 2CCD Clock Adjustments

(shown centered, as after doing part b) 5-7

5-4 (SN B010249 &Below) CH 1and CH 2CCD Clock Adjustments

(shown centered, as after doing part b) 5-8

5-5 CCD counts display and CM adjustment menu 5-8

5-6 CCD sides 1-4 for CH 1before L-clock adjustment 5-12

5-7 Sides 1and 3 before adjustment of LIS and after 5-13

5-8 CH 1with L-clocks correctly adjusted, but with stray samples 5-14

5-9 Display for adjusting CCD Aand Tclocks •5-15

5-1 0Typical CH 1and CH 2displays after clock adjustment 5-1

5-11 Checking sample dispersion 5-17

12 Input and output (after adjustment) waveforms 5-20

1Multipin connector 6-8

6-2 Circuit board Location 6-1 6

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

6-4 Trigger LED binary coding for diagnostic tests 6-29

6-5 Main EXT DIAG Menu 6-30

6-6 Initial troubleshooting chart *6-36

6-7 Mux Test waveforms 6-41

2440 Service

LIST OF ILLUSTRATIONS (cont)

Page

6-8

6-9

6-10

9-1

9-2

9-3

9-4a

9-4b

9-5

9-6

9-7

9-8

9-9

9-10

9-11

9-12

Typical Register test waveforms

Front Panel ftP diagnostics test..

System fiP data bit D7 in the Bus Isolate mode

Color codes for resistors and- capacitors. * - —~———-———-

Semiconductor lead configurations.

Locating components on schematic diagrams and circuit board illustrations.

Detailed 2440 Block Diagram.

Detailed 2440 Block Diagram (cont).

A12—Processor Board.

A13—Side Board. !

A14—Front Panel Board.

A10—Main Board.

A30, A31, A32 and A33— Gain Cell Boards.

A1 1—Timebase/Display Board.

A17—High Voltage Board.

A16—Low Voltage Power Supply Board.

(

2440 Service

LIST OF TABLES

Table Page

1-1 Electrical Characteristics

1-2 Environmental Characteristics

1-3 Mechanical Characteristics

1-4 Option 05 (TV Trigger) Electrical Characteristics

2-1 Voltage, Fuse, and Power-Cord Data

3-1 Host Memory-Mapped I/O

3-2 Processor Control Register Functions

3-3 Processor Miscellaneous Register (PM REG) Output Functions...

3.4 Waveform pPAddress Decoding

3-5 Trigger Logic Array Addresses (6080h-6087h)

3-6 Phase Clock Array Control Lines (CC3 through CCO)

3-7 Holdoff Delay Range for Current Source vs Charging Capacitor

Combinations

3-8 Side Board Address Decoding

3-20

3-21

3-22

3-27

3-52

3-55

3-59

3-60

4-1 Test Equipment Required

4-2 Accuracy Limits CH 1and CH 2CURSOR VOLTS Readout and Aand

BTRIGGER LEVEL Readouts .

4-3 Minimum Display Level for CH 1or CH 2Triggering

4_4 Minimum Signal Level for EXT1 or EXT2 Triggering

6-1 Relative Susceptibility to Static-Discharge Damage

6-2 External Inspection Check List

6-3 Internal Inspection Check List

6-4 Power Supply Voltage and Ripple Limits

6-5 Maintenance Aids

6-6 2440 Troubleshooting Procedures

6-7 Video Option Troubleshooting

6-8 INIT PANEL States.....

6-3

6-5

6-6

6-10

6-13

6-37

6-104

6-108

2440 Service

OPERATORS SAFETY SUMMARY

Thegenera! safety information in this part of the summary is for both operating and

Specific warnings and cautions will be found throughout the manuai where they apply and

summary.

servicing personnel,

do not appear in this

Terms in This Manuai

CAUTION statements identify conditions or practices that

could result in damage to the equipment or other property.

WARNING statements identify conditions or practices that

could result in personal injury or loss of life.

Terms as Marked on Equipment

CAUTION indicates apersonal injury hazard not immedi-

ately accessible as one reads the markings, or ahazard to

property, including the equipment itself.

DANGER indicates apersonal injury hazard immediately

accessible as one reads the marking.

Grounding the Product

This product is grounded through the grounding conductor

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

power cord into aproperly wired receptacle before making

any connections to the product^ input or output terminals.

Aprotective ground connection by way of the grounding

conductor in the power cord is essential for safe operation.

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.

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.

Use the Proper Power Cord

Use only the power cord and connector specified for the

instrument.

Symbols as Marked on Equipment

ff DANGER —High voltage.

Protective gound (earth) terminal.

Use the Proper Fuse .

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

instrument parts list. Areplacement fuse must meet the

type, voltage rating, and current rating specifications for

the fuse that it replaces.

A\ ATTENTION —Refer to manual.

Power Source

This product is intended to operate from apower source

that will not apply more than 250 volts rms between the

supply conductors or between either supply conductor and

ground. Aprotective ground connection by way of the

grounding conductor in the power cord is essential for safe

operation.

Do Not Operate in Explosive Atmospheres

To avoid explosion, do not operate this instrument in an

atmosphere of explosive gasses.

Do Not Remove Covers or Panels

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.

(I J

2440 Service

SERVICING SAFETY SUMMARY

FOR QUALIFIED SERVICE PERSONNEL ONLY

Refer also to the preceding Operators Safety Summary.

Do Not Service Alone

Do not perform internal service or adjustment of this pro-

duct unless another person capable of rendering first aid

and resuscitation is present.

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.

Disconnect power before removing protective panels, sol-

dering, or replacing components.

Power Source

This product is intended to operate from apower source

that does not apply more than 250 volts rms bwetween

the supply conductors or between either supply conductor

and ground. Aprotective ground connection by way of the

grounding connector in the power cord is essential for safe

operation.

<• )

()

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