Tektronix 2430 User manual

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

Copyright ETektronix, Inc. 1986. All rights reserved.
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......................................................... v
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
ii
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

iv
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

v
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.
vi
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