Tektronix 2230 User manual

“V I Z I S SERVICE 070-4999-00
I L « r \ MANUAL ___________________ _ __________________Product Group 4
2230
DIGITAL STORAGE
OSCILLOSCOPE
SERVICE
WARNING
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
Fir t Printing JUL 1986
Revi ed MAY 1987 Ttektronix-
c o m m ttto to excellence

Copyright © 1986 Tektronix, Inc. All right re erved.
Content of thi publication may not be reproduced in any
form without the written permi ion of Tektronix, Inc.
Product of Tektronix, Inc. and it ub idiarie are covered
by U.S. and foreign patent and/or pending patent .
are
TEKTRONIX, TEK, SCOPE-MOBILE, and
regi tered trademark of Tektronix, Inc.
Printed in U.S.A. Specification and price change privilege
are re erved.
INSTRUMENT SERIAL NUMBERS
Each in trument ha a erial number on a panel in ert, tag,
or tamped on the cha i . The fir t number or letter
de ignate the country of manufacture. The la t five digit
of the erial number are a igned equentially and are
unique to each in trument. Tho e manufactured in the
United State have ix unique digit . The country of
manufacture i identified a follow :
B000000 Tektronix, Inc., Beaverton, Oregon, USA
100000 Tektronix Guern ey, Ltd., Channel I land
200000 Tektronix United Kingdom, Ltd., London
300000 Sony/Tektronix, Japan
700000 Tektronix Holland, NV, Heerenveen,
The Netherland

2230 Service
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS .......................................... iv
LIST OF TABLES........................................................ vi
OPERATORS SAFETY SUMMARY ............................ viii
SERVICING SAFETY SUMMARY .................................. ix
Page
OPERATOR'S CHECKS AND
ADJUSTMENTS ...............................
....... 2-25
INITIAL SETUP ............................
....... 2-25
TRACE ROTATION
ADJUSTMENT
.............................
....... 2-26
PROBE COMPENSATION ..........
....... 2-26
HORIZONTAL ACCURACY
CHECK
.........................................
....... 2-27
Section 1 GENERAL INFORMATION
INTRODUCTION .................................. 1-1
SPECIFICATION .................................. 1-1
Section 2 OPERATING INFORMATION
PREPARATION FOR USE ....................... 2-1
SAFETY ............................................... 2-1
LINE VOLTAGE ................................... 2-1
POWER CORD .................................... 2-1
LINE FUSE .......................................... 2-2
INSTRUMENT COOLING .................... 2-2
START-UP ........................................... 2-2
REPACKAGING ................................... 2-3
CONTROLS, CONNECTORS,
AND INDICATORS ................................... 2-4
POWER AND DISPLAY ...................... 2-4
VERTICAL ........................................... 2-4
HORIZONTAL ...................................... 2-8
TRIGGER ............................................. 2-12
STORAGE CONTROLS ...................... 2-15
MENU SELECTED FUNCTIONS ........ 2-17
REAR PANEL ...................................... 2-19
SIDE PANEL ........................................ 2-19
CRT READOUT ................................... 2-20
OPERATING CONSIDERATIONS ........... 2-23
GRATICULE ........................................ 2-23
GROUNDING ....................................... 2-23
SIGNAL CONNECTIONS .................... 2-23
INPUT-COUPLING
CAPACITOR PRECHARGING ............ 2-24
Section 3 THEORY OF OPERATION
SECTION ORGANIZATION.................... 3-1
INTEGRATED CIRCUIT
DESCRIPTIONS .................................... 3-1
GENERAL DESCRIPTION..................... 3-1
DETAILED CIRCUIT DESCRIPTION ....... 3-7
ANALOG Cl RCUITRY ........................... 3-7
VERTICAL ATTENUATORS.................. 3-7
VERTICAL PREAMPLIFIERS ............. 3-10
VERTICAL OUTPUT
AMPLIFIER .......................................... 3-12
TRIGGERING ....................................... 3-13
A SWEEP GENERATOR AND
LOGIC .................................................. 3-17
B TIMING AND ALTERNATE
B SWEEP ............................................. 3-20
HORIZONTAL ...................................... 3-23
MICROPROCESSOR AND
STORE-PANEL CONTROLS .............. 3-25
STATUS ADC AND BUS
INTERFACE ......................................... 3-26
STORAGE ACQUISITION ................... 3-28
ACQUISITION MEMORY .................... 3-30
DIGITAL TIME BASE .......................... 3-38
DIGITAL DISPLAY .............................. 3-44
VECTOR GENERATOR ...................... 3-45
POWER INPUT, PREREGULATOR
AND INVERTER .................................. 3-47
POWER SUPPLY SECONDARIES,
Z-AXIS AND CRT ................................ 3-49
X-Y PLOTTER ..................................... 3-51

2230 Service
TABLE OF CONTENTS (cont)
Page
Section 4 PERFORMANCE CHECK PROCEDURE
INTRODUCTION ...................................... 4-1
PURPOSE ............................................ 4-1
PERFORMANCE CHECK
INTERVAL ........................................... 4-1
STRUCTURE ....................................... 4-1
TEST EQUIPMENT REQUIRED ......... 4-1
LIMITS AND TOLERANCES ............... 4-1
PREPARATION FOR CHECKS .......... 4-1
INDEX TO PERFORMANCE
CHECK STEPS .................................... 4-3
VERTICAL................................................ 4-4
INITIAL CONTROL SETTINGS ........... 4-4
PROCEDURE STEPS ......................... 4-4
HORIZONTAL ........................................... 4-12
INITIAL CONTROL SETTINGS ........... 4-12
PROCEDURE STEPS ......................... 4-12
TRIGGER.................................................. 4-17
INITIAL CONTROL SETTINGS ........... 4-17
PROCEDURE STEPS ......................... 4-17
EXTERNAL Z-AXIS, PROBE
ADJUST, EXTERNAL CLOCK,
AND X-Y PLOTTER ................................. 4-21
INITIAL CONTROL SETTINGS ........... 4-21
PROCEDURE STEPS ......................... 4-21
Section 5 ADJUSTMENT PROCEDURE
INTRODUCTION ...................................... 5-1
PURPOSE ............................................ 5-1
STRUCTURE ....................................... 5-1
TEST EQUIPMENT ............................. 5-1
LIMITS AND TOLERANCES ............... 5-1
ADJUSTMENTS AFFECTED BY
REPAIRS ............................................. 5-1
PREPARATION FOR
ADJUSTMENT ..................................... 5-1
INDEX TO ADJUSTMENT
PROCEDURE STEPS ......................... 5-3
POWER SUPPLY AND CRT DISPLAY.... 5-4
INITIAL CONTROL SETTINGS. .......... 5-4
PROCEDURE STEPS ......................... 5-4
Page
VERTICAL.................................................... 5-6
INITIAL CONTROL SETTINGS ............ 5-6
PROCEDURE STEPS ........................... 5-6
HORIZONTAL .............................................. 5-19
INITIAL CONTROL SETTINGS ............ 5-19
PROCEDURE STEPS ........................... 5-19
TRIGGER...................................................... 5-27
INITIAL CONTROL SETTINGS ............ 5-27
PROCEDURE STEPS ........................... 5-27
EXTERNAL Z-AXIS, PROBE
ADJUST, EXTERNAL CLOCK,
AND X-Y PLOTTER.................................... 5-32
INITIAL CONTROL SETTINGS ............ 5-32
PROCEDURE STEPS ........................... 5-32
Section 6 MAINTENANCE
STATIC-SENSITIVE COMPONENTS................. 6-1
PREVENTIVE MAINTENANCE.................. 6-2
INTRODUCTION..................................... 6-2
GENERAL CARE.................................... 6-2
INSPECTION AND CLEANING ............ 6-2
LUBRICATION........................................ 6-5
SEMICONDUCTOR CHECKS .............. 6-5
PERIODIC READJUSTMENT .............. 6-5
TROUBLESHOOTING ................................ 6-5
INTRODUCTION..................................... 6-5
TROUBLESHOOTING AIDS................. 6-5
TROUBLESHOOTING
EQUIPMENT ........................................... 6-11
TROUBLESHOOTING
TECHNIQUES ......................................... 6-11
DIAGNOSTICS....................................... 6-14
CORRECTIVE MAINTENANCE ................ 6-31
INTRODUCTION..................................... 6-31
MAINTENANCE PRECAUTIONS ......... 6-31
OBTAINING REPLACEMENT
PARTS..................................................... 6-31
MAINTENANCE AIDS ........................... 6-31
INTERCONNECTIONS .......................... 6-33
TRANSISTORS AND
INTEGRATED CIRCUITS ...................... 6-33
SOLDERING TECHNIQUES................. 6-33
REMOVAL AND REPLACEMENT
INSTRUCTIONS..................................... 6-34

TABLE OF CONTENTS (cont)
2230 Service
Page
Section 7 OPTIONS
INTRODUCTION......................................... 7-1
POWER CORD OPTIONS ...... .................. 7-1
OPTION 33 .................................................. 7-1
OPTION 10 AND OPTION 12 ................... 7-1
INTRODUCTION .................................... 7-1
STANDARD FUNCTIONS,
FORMATS, AND FEATURES . ............. 7-2 >
PERFORMANCE CONDITIONS .......... 7-3
OPTIONS SIDE PANEL........................ 7-3
INTERFACE STATUS
INDICATORS.......................................... 7-8
MENU SELECTED FUNCTIONS ......... 7-8
GPIB PARAMETER SELECTION........ 7-9
RS-232-C PARAMETER
SELECTION ............................................. 7-10
MESSAGES AND
COMMUNICATION PROTOCOL ......... 7-10
COMMAND LISTS ................................. 7-12
WAVEFORM TRANSFERS.................... 7-28
REMOTE-LOCAL
OPERATING STATES ............................ 7-31
INSTRUMENT RESPONSE TO
INTERFACE MESSAGES ...................... 7-32
GPIB PROGRAMMING .......................... 7-33
RS-232-C PROGRAMMING .................. 7-33
RESET UNDER COMMUNICATION
OPTIONS CONTROL ............................. 7-34
STATUS AND ERROR
REPORTING ............................................ 7-34
Page
READOUT/MESSAGE COMMAND
CHARACTER SET............................... 7-35
ASCII CODE CHART........................... 7-35
OPTION 10 THEORY
OF OPERATION................................... 7-40
OPTION 12 THEORY
OF OPERATION................................... 7-41
OPTION MEMORY .............................. 7-43
' PERFORMANCE CHECK
PROCEDURE....................................... 7-44
ADJUSTMENT PROCEDURE.............. 7-45
OPTION MAINTENANCE
INFORMATION..................................... 7-45
Section 8 REPLACEABLE ELECTRICAL PARTS
Section 9 DIAGRAMS
Section 0 REPLACEABLE MECHANICAL PARTS
CHANGE INFORMATION
Diagnostic Information:
Diagnostics ................................................................. 6- 4
Diagnostic Messages................................................ 6- 7
Diagnostic Tests ........................................................ 6-2

2230 Service
LIST OF ILLUSTRATIONS
Figure Page
The 2230 Digital Storage O cillo cope..................................................................................... *
1-1 Maximum input voltage v . frequency derating curve for CH 1 OR X,
CH 2 OR Y, and EXT INPUT connector ................................................................................. 1-14
1- 2 Phy ical Dimen ion of the 2230 O cillo cope.......................................................................... 1-15
2- 1 Securing the detachable power-cord to the in trument............................................................. 2-1
2-2 Optional power cord data.......................................................................................................... 2-2
2-3 Fu e holder and detachable power-cord connector................................................................... 2-2
2-4 Power and di play control and power-on indicator .................................... ; ............... 2-5
2-5 Vertical control and connector ............................................................................................... 2-6
2-6 Horizontal control ..................................................................................................................... 2-9
2-7 Trigger control , connector, and indicator................................................................................. 2-12
2-8 Storage control ..................... 2-15
2-9 Rear-panel....................................................................................... 2-19
2-10 Side Panel.....................................................................................................................................2-20
2-11 X-Y Plotter interfacing ........... ......................................................................................................2-21
2-12 Crt readout di play ................. 2-22
2-13 Graticule mea urement marking ................................................................................................2-23
2- 26 Probe compen ation.....................................................................................................................2-26
3- 1 Simplified block diagram ....... .................................................................................................... 3-2
3-2 Block diagram of the Channel 1 Attenuator circuit.................................................................... 3-8
3-3 Store-Non Store Vertical Switching...........................................................................................3-11
3-4 Block diagram of Trigger Amplifier and Switching................................................................... 3-14
3-5 A Sweep Generator and Logic Circuitry.................................................................................... 3-18
3-6 Horizontal Amplifier block diagram............................................................................................ 3-24
3-7 Sampling mode acqui ition timing at 0.05 ^ per divi ion
(ADCLK = CONV = 20 MHz).................................................................................................. 3-31
3-8 MIN/MAX Acqui ition timing at 20 per divi ion..................................................................... 3-33
3-9 Acqui ition Memory timing............................................................. 3-37
3-10 Clock timing..................................................................................................................................3-39
3-11 Simplified diagram of the Dc Re torer circuitry............................................. 3-50
6-1 Multi-connector holder orientation................................................. 6-7
6-2 Grounding the ignal line of P2111 and P2112 ....................................................................... 6-7
6-3 I olated kernel timing................................................................................................................. 6-9
6-4 Diagno tic Menu...........................................................................................................................6-19
6-5 Error code timing (U4119).......................................................................................................... 6-20
6-6 PU error di play............................................................................................................................6-21
6-7 Location of crew and pacer on the Storage circuit board ................................................... 6-37
6-8 Rece ed crew and rear hinge removal ....................................... 6-38
6- 9 Location of crew ecuring Power-Supply hield and the upport
bracket to the rear cha i frame ................................................. 6-40
7- 1 Option ide panel ...................................................................................................................... 7-4
7-2 Interface tatu indicator .......................................................................................................... 7-8
iv REV DEC 1986

LIST OF ILLUSTRATIONS (cont)
2230 Service
Figure
9-1 Color code for re i tor and capacitor .
9-2 Semiconductor lead configuration .
9-3 Locating component on chematic diagram and circuit board illu tration .
9-4 Detailed analog block diagram
9-5 Detailed torage block diagram.
9-6 A2—Attenuator board.
9-7 A14—CH 1 Logic board.
9-8 A14—CH 2 Logic board.
9-9 A1—Main board.
9-10 Circuit view of A1—Main board.
g. A17—Po ition Interface board.
9-12 A3—Front Panel board.
9-13 Circuit view of A3—Front Panel board.
9-14 A4—Timing board.
9-15 A13—Sweep Interface board.
9-16 A5—Alternate Sweep board.
9-17 A16—Sweep Reference board.
9-18 A6—Line Filter board.
9-19 A18—Thermal Shutdown board.
9-20 A7—Inten ity Pot board.
9-21 A10—Storage board.
9-22 A11A1—Input/Output board.
9-23 A11A2—Vector Generator board.
9.24 A20—X-Y Plotter board.
9-25 A21—RS-232 Option board.
9-26 A22—GPIB Option board.
9-27 A23—Option Memory board.
REV DEC 1986

2230 Service
LIST OF TABLES
Table Page
1-1 Electrical Characteri tic ............................................................................................................. 1-3
1-2 Environmental Characteri tic .................................................................................................... 1-13
1- 3 Phy ical Characteri tic .............................................................................................................. 1-14
2- 1 Probe Coding............................................................................................................................... 2-7
2-2 Default Digital Storage Mode ................................................................................................... 2-9
2-3 Repetitive Store Sampling Data Acqui ition ............................. 2-10
2- 4 Auxiliary Connector..................................................................................................................... 2-20
3- 1 Memory Space Allocation ........................................................ 1..........3-27
3-2 MIN/MAX Clock Selector Multiplexer Switching ........................................................................ 3-32
3-3 Time Ba e Clock Frequencie .................................................................................................... 3-41
3-4 Time Ba e Divider Preload Bit .................................................................................................. 3-42
3- 5 Trigger Logic Multiplexer Switching............................................................................................ 3-43
4- 1 Te t Equipment Required............................................................................................................ 4-2
4-2 Deflection Accuracy Limit .......................................................................................................... 4-4
4-3 Storage Deflection Accuracy ...................................................... 4-5
4-4 Setting for Bandwidth Check .................................................. 4-7
4-5 Setting for Timing Accuracy Check ..........................................................................................4-13
4-6 Setting for Delay Time Differential Check ............................................................................... 4-15
4- 7 Switch Combination for A Triggering Check .......................................................................... 4-18
5- 1 Adju tment Affected by Repair .............................................................................................. 5-2
5-2 Power Supply Limit ................................................................................................................... 5-5
5-3 Deflection Accuracy Limit ......................................................................................................... 5-8
5-4 Store Deflection Accuracy.......................................................................................................... 5-10
5-5 Attenuator Compen ation Adju tment ..................................... 5-12
5-6 Setting for Bandwidth Check .................................................. 5-16
5-7 Setting for Timing Accuracy Check ........................................................................................ 5-23
5-8 Setting for Delay Time Differential Check .............................................................................. 5-24
5- 9 Switch Combination for A Triggering Check .......................................................................... 5-28
6- 1 Relative Su ceptibility to Static-Di charge Damage.................................................................. 6-1
6-2 External In pection Checkli t..................................................................................................... 6-3
6-3 Internal In pection Checkli t...................................................................................................... 6-3
6-4 Timing Switch Interface Voltage .............................................................................................. 6-10
6-5 Vertical VOLTS/DIV Switch Interface Voltage ......................................................................... 6-11
6-6 AC GND DC Switch Interface Voltage .................................................................................... 6-11
6-7 Power Supply Voltage and Ripple Limit .................................................................................. 6-12
6-8 Diagno tic Me age and Te t ..................................................................................................6-14
6-9 Circuitry Checked by Each Te t and Exerci er.......................................................................... 6-15
6-10 U4119 Error Code Di play......................................................................................................... 6-16
6-11 Diagno tic Me age ................................................................... 6-17
6-12 Diagno tic Acqui ition Value ......................................................................................................6-20
6-13 PU TEST Failure Code ...............................................................................................................6-22
6-14 Acqui ition Addre Bu Te t Pattern ..................................................................................... 6-23
vi

LIST OF TABLES (cont)
2230 Service
Table Page
6-15 PRC Te t Pattern ...................................................................................................................... 6-24
6-16 Di play Format..............................................................................................................................6-28
6-17 Di play Format Bit Definition .................................................................................................... 6-28
6-18 ACQ_MEM 0x48000.................................................................................................................. 6-29
6-19 ACQ_MODE 0x437BE............................................................................................................... 6-29
6-20 TB_MODE 0x407DE.................................................................................................................. 6-29
6-21 TB_SWP_RATE 0x407EE......................................................................................................... 6-29
6-22 FP_A/D_CTL 0x437F6............................................................................................................... 6-29
6-23 Di play Format Digit Definition .................................................................................................. 6-30
6-24 Maintenance Aid ............. ............................................................................................................6-32
7-1 Function Sub et Implemented.......................
7-2 Specific Format Choice ................................
7-3 Implementation of Specific Feature ..............
7-4 Option Electrical Characteri tic ....................
7-5 GPIB Connector .............................................
7-6 GPIB PARAMETERS Switch........................
7-7 RS-232-C PARAMETERS Switch..................
7-8 Baud Rate......................................................
7-9 Parity Selection...................................., .......
7-10 RS-232-C DTE Connector .............................
7-11 RS-232-C DCE Connector .............................
7-12 Numeric Argument Format for Command ...
7-13 Vertical Command ........................................
7-14 Horizontal Command ...................................
7-15 Trigger Command .........................................
7-16 Cur or Command .........................................
7-17 Di play Command ........................................
7-18 Acqui ition Command ..................................
7-19 Save and Recall Reference: Command ........
7-20 Waveform Command ...................................
7-21 Waveform Preamble Field ...........................
7-22 Service Reque t Group Command .............
7-23 Mi cellaneou Command .............................
7-24 RS-232-C Specific Command .....................
7-25 Query and Re pon e Example ...................
7-26 Typical 8-Bit Binary Waveform Data ............
7-27 Typical 16-Bit Binary Waveform Data .......... .
7-28 Typical 8-Bit Hexadecimal Waveform Data....
7-29 Typical 16-Bit Hexadecimal Waveform Data..
7-30 Typical ASCII Waveform Data ......................
7-31 Statu Event and Error Categorie ...............
7-32 Event Code .................................................
7-33 Readout/MES age Command Character Set
7-34 ASCII Code Chart .........................................
7-35 GPIB Statu Buffer Function .......................
7-36 RS-232-C Statu Buffer Function ................
7-37 Te t Equipment Required...............................
7-2
7-3
7-3
7-4
7-5
7-5
7-6
7-6
7-7
7-7
7-7
7-12
7-13
7-14
7-15
7-16
7-17
7-18
7-20
7-22
7-23
7-25
7-26
7-26
7-27
7-29
7-30
7-30
7-31.
7-31'
7-35
7-36
7-38
7-39
7-41
7-43
7-44
vii

2230 Service
OPERATORS SAFETY SUMMARY
The eneral safety information in this part o f the summary is for both operatin and servicin personnel.
Specific warnin s and cautions will be found throu hout the manual where they apply and do not appear in this
summary.
Terms in This Manual
CAUTION tatement identify condition or practice that
could re ult in damage to the equipment or other property.
WARNING tatement identify condition or practice that
could re ult in per onal injury or lo of life.
Grounding the Product
Thi product i grounded through the grounding conductor
of the power cord. To avoid electrical hock, plug the
power cord into a properly wired receptacle before con
necting to the product input or output terminal . A protec
tive ground connection by way of the grounding conductor
in the power cord i e ential for afe operation.
Terms as Marked on Equipment
CAUTION indicate a per onal injury hazard not immedi
ately acce ible a one read the marking , or a hazard to
property, including the equipment it elf.
DANGER indicate a per onal injury hazard immediately
acce ible a one read the marking.
Symbols in This Manual
Thi ymbol indicate where applicable cau-
Ationary or other information i to be found. For
maximum input voltage ee Table 1-2.
Danger Arising from Loss of Ground
Upon lo of the protective-ground connection, all acce i
ble conductive part (including knob and control that
may appear to t>e in ulating) can render an electric hock.
Use the Proper Power Cord
U e only the power cord and connector pecified for your
product.
U e only a power cord that i in good condition.
For detailed information on power cord and connector ,
ee Figure 2-2.
Symbols as Marked on Equipment
f f DANGER — High voltage.
Protective gound (earth) terminal.
ATTENTION — Refer to manual.
Power Source
Thi product i intended to operate from a power ource
that doe not apply more than 250 volt rm between the
upply conductor or between either upply conductor and
ground. A protective ground connection by way of the
grounding conductor in the power cord i e ential for afe
operation.
Use the Proper Fuse
To avoid fire hazard, u e only a fu e of the correct type,
voltage rating and current rating a pecified in the part
li t for your product.
Do Not Operate in Explosive Atmospheres
To avoid explo ion, do not operate thi product in an
explo ive atmo phere unle it ha been pecifically
certified for uch operation.
Do Not Remove Covers or Panels
To avoid per onal injury, do not remove the product cov
er or panel . Do not operate the product without the cov
er and panel properly in talled.
viii