Tektronix 2336YA User manual

COMMITTED TO EXCELLENCE
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 SUMMARY PRIOR TO
PERFORMINGANY SERVICE.
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
OSCILLOSCOPE
SERVICE
INSTRUCTION MANUAL
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-5011-00
Product Group 38
Serial Number
First Printing OCT 1983

Copyright @ 1983 Tektronix, Inc. All rights reserved.
Contents of this publication may not be reproduced in any
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiariesare covered
by U.S. and foreign patents and/or pending patents.
TEKTRONIX, TEK, SCOPE-MOBILE, and are
registered trademarks of Tektronix, Inc. TELEQUIPMENT
is a registered trademark of Tektronix U.K. Limited.
Printed in USA.Specification and price change privileges
are reserved.
INSTRUMENTSERIAL NUMBERS
Each instrument has a serial number on a panel 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
manufactureis identifiedas follows:
BOO0000 Tektronix, Inc., Beaverton, Oregon, USA
1 00000 Tektronix Guernsey, Ltd., Channel Islands
200000 Tektronix United Kingdom, Ltd., London
300000 SonyITektronix,Japan
700000 Tektronix Holland,
NV, Heerenveen,
The Netherlands

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2336 Service
TABLE OF CONTENTS
Page
...
.................
LIST OF ILLUSTRATIONS 111
........................
LIST OF TABLES v
............
OPERATORS SAFETY SUMMARY vi
.............
SERVICING SAFETY SUMMARY vii
SECTION 1 SPECIFICATION
INTRODUCTION ............. 1-1
............... ACCESSORIES 1-1
AVAILABLE OPTION
.......... 1-1
PERFORMANCE CONDITIONS
... 1-1
SECTION 2 OPERATING INSTRUCTIONS
PREPARATION FOR USE ......... 2-1
SAFETY CONSIDERATIONS
..... 2-1
LINE VOLTAGE SELECTION
.... 2-1
LINE FUSE
................. 2-1
POWER CORD
............... 2-2
CONTROLS. CONNECTORS.
AND INDICATORS
.............. 2-3
POWER AND DISPLAY
......... 2-3
VERTICAL
................. 2-3
HORIZONTAL
............... 2-5
ATRIGGER
................ 2-6
BTRIGGER
................. 2-7
REAR PANEL
............... 2-8
OPERATING CONSIDERATIONS
.... 2-9
GRATICULE
................ 2-9
GROUNDING
............... 2-10
SIGNAL CONNECTIONS
........ 2-10
INPUTCOUPLING CAPACITOR
PRECHARGING
.............. 2-10
INSTRUMENT COOLING
....... 2-10
OSCILLOSCOPE DISPLAYS
........ 2-11
INTRODUCTION
............. 2-11
NORMAL SWEEP DISPLAY
...... 2-11
SIGNAL DISPLAY
............ 2-11
MAGNIFIED-SWEEPDISPLAY
.... 2-12
DELAYED-SWEEPDISPLAY
..... 2-12
DELAYED-SWEEP
MEASUREMENTS
............ 2-12
SINGLE-SWEEPDISPLAY
....... 2-12
X-Y DISPLAY
............... 2-13
Page
SECTION
3 THEORY OF OPERATION
...............
INTRODUCTION 3-1
GENERAL DESCRIPTION
......... 3-2
DETAILED CIRCUIT
.................
DESCRIPTION 3-6
CHANNEL 1AND CHANNEL 2
ATTENUATORS
............. 3-6
VERTICAL PREAMPLIFIERS.
DIODE GATES. AND DELAY
...............
LINE DRIVER 3-7
VERTICAL OUTPUT
.................
AMPLIFIER 3-10
VERTICAL SWITCHING LOGIC
........
AND CHOP BLANKING 3-11
..................
TRIGGER 3-13
....................
SWEEP 3-19
....
AAND BTlMlNGSWITCHES 3-26
......
HORIZONTALAMPLIFIER 3-26
...............
CRT CIRCUIT 3-29
LOW-VOLTAGEPOWER SUPPLY
. . 3-33
...............
FAN CIRCUIT 3-35
...............
CALIBRATOR 3-35
................
DELTA TIME 3-36
SECTION 4 PERFORMANCE CHECK
PROCEDURE
INTRODUCTION ............... 4-1
TEST EQUIPMENT REQUIRED
... 4-1
PERFORMANCE CHECK
INTERVAL
................. 4-1
LIMITS AND TOLERANCES
..... 4-1
SPECIAL FIXTURES
.......... 4-1
PREPARATION
.............. 4-1
INDEX TO PERFORMANCE
CHECK STEPS
............... 4-4
VERTICAL
................... 4-5
TRIGGERING
................. 4-13
HORIZONTAL
................. 4-18
EXTERNAL Z-AXISAND
................. CALIBRATOR 4-23
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2336 Service
TABLE OF CONTENTS (cont)
Page
SECTION
5 ADJUSTMENT PROCEDURE
...............INTRODUCTION 5-1
...
TEST EQUIPMENT REQUIRED 5-1
..... LIMITS AND TOLERANCES 5-1
....... PARTIAL PROCEDURES 5-1
INTERNAL ADJUSTMENTS AND
... ADJUSTMENT INTERACTION 5-2
PREPARATION FOR
............... ADJUSTMENT 5-2
INDEX TO ADJUSTMENT
................ PROCEDURE 5-4
MAINPOWER SUPPLY
........... 5-5
DISPLAY AND Z.AXIS
........... 5-7
VERTICAL
................... 5-9
................. TRIGGERING 5-19
................. HORIZONTAL 5-26
EXTERNAL Z-AXISAND
CALIBRATOR
................. 5-35
SECTION 6 MAINTENANCE
STATIC-SENSITIVECOMPONENTS . . 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 ................6-7
TROUBLESHOOTING
TECHNIQUES
............... 6-7
CORRECTIVE MAINTENANCE ..... 6-12
INTRODUCTION
............. 6-12
MAINTENANCE PRECAUTIONS
.. 6-12
OBTAINING REPLACEMENT
PARTS
.................... 6-12
MAINTENANCE AIDS
......... 6-12
INTERCONNECTIONS
......... 6-12
Page
CORRECTIVE M.AINTENANCE (cont)
TRANSISTORS AND
INTEGRATED CIRCUITS
....... 6-14
SOLDERING TECHNIQUES
...... 6-14
REMOVAL AND REPLACEMENT
INSTRUCTIONS
.............. 6-15
Cabinet
.................. 6-16
Lid Cover................. 6-16
A30-Delta Time Logic
Circuit Board
.............. 6-16
BTrigger Panel
............. 6-17
Delta Time Interconnect Cable
... 6-17
Cathode-RayTube
........... 6-18
A15-Vert 0utIH.V. Power
Supply Circuit Board .........6-19
A10-Vert Preamp1L.V. Power
Supply Circuit Board
......... 6-20
A1
I -Negative Regulator
..............Circuit Board 6-22
A12-Positive Regulator
Circuit Board
.............. 6-22
A23-Trigger Circuit Board ..... 6-22
A24-SweepIHoriz Amp/Opt
Circuit Board
.............. 6-23
Timing Switch Assembly
....... 6-23
Attenuators ............... 6-27
REPACKAGINGFOR SHIPMENT ..
6-31
.....
SELECTABLE COMPONENTS 6-31
SECTION 7 OPTIONS
............. INTRODUCTION 7-1
................. OPTION03 7-1
SECTION 8 REPLACEABLE ELECTRICAL PARTS
SECTION
9 DIAGRAMS
SECTION
10 REPLACEABLE MECHANICAL PARTS
ACCESSORIES
CHANGE INFORMATION
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REV NOV 1981

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2336 Service
Figure
LIST OF ILLUSTRATIONS
Page
...
The 2336 Oscilloscope VIII
LINE VOLTAGE SELECTOR switch. line fuse. and power cord ...................
2-2
................................................
Optional power cords 2-2
..................................
Power and display controls and indicators 2-3
.................. Vertical controls. connectors. and indicatorsand calibrator output 2-4
........................................
Horizontal controls and indicator 2-5
..............................
A TRIGGER controls. connector. and indicator 2-6
............................B TRIGGER controls. connector. and LCD readout 2-8
...............................................
Rear-panelconnectors 2-9
........................................
Graticule measurement markings 2-9
................................
Basic block diagram of the 2336 Oscilloscope 3-3
Channel
1 Vertical Attenuator. simplified block diagram ......................... 3-6
Vertical Preamplifier. Diode Gate. and Delay Line Driver. simplified block diagram
....... 3-8
...................................
Diode Gate biasing for Channel 1display 3-9
....................
Simplified illustration of Multiplexer U215 switching operation 3-11
...................................
Trigger circuitry. detailed block diagram 3-14
...................................
Trigger signal slow path (lowfrequency) 3-15
...................................
Trigger signal fast path (high frequency) 3-16
Simplified diagram of the
B Trigger Generator and B Source and B Slope
..................................................
switching circuitry 3-18
....................................
Sweep operation in the A Sweep Mode 3-23
.....................................
Sweep circuit waveform relationships 3-24
....................................
Sweep operation in the B Sweep Mode 3-25
................................
Horizontal Amplifier. detailed block diagram 3-27
...............................
High-Voltage Oscillator wavefrom relationships 3-29
....................................
DC Restorer circuit. simplified diagram 3-33
...............................................
Foldover circuit action 3-34
.................... Typical waveforms in the Fan Motor three-stage inverter circuit 3-35
Simplified diagram of the Delay Time Switching and Prescaling circuit
............... 3-38
.......................................
Exclusive-ORgate switching action 3-41
............................... Test setup for external trigger and jitter checks 4-15
......................
Areas affected by high-frequency compensation adjustments 5-15
.........................................
Multipin connector orientation 6-7
.......................................
Attenuator contact pressure check 6-11
..........................................
Attenuator contact alignment 6-11
.........................................
SECIDIV switch exploded view 6-24
.......................................
Vertical attenuator exploded view 6-28
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2336 Service
LIST OF ILLUSTRATIONS (cont)
Figure
Color codes for resistors and capacitors.
Semiconductor lead configurations.
Locatingcomponents on schematic diagrams and circuit board illustrations.
2336 main block diagram.
2336 Delta Time block diagram.
A19-Attenuator exploded view.
A1
I -Negative Regulator, A12-Positive Regulator, and
AlO-Vertical Preamp1L.V. Power Supply boards.
A15-Vertical 0utputIH.V. Power Supply board.
A23-Trigger board.
A24-SweepIHorizontal Amplifier/Option board.
A16-B Timing and A17-A Timing boards.
Timing Switch exploded view.
A30-Delta Time Logic and A31-B Timing Slope Switch boards.
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LIST OF TABLES
Table
2336 Service
Page
Electrical Characteristics .............................................. 1-2
Environmental Characteristics
.......................................... 1-10
...............................................
Physical Characteristics 1-11
Option Electrical Characteristics
......................................... 1-11
Line Voltage and Fuse Selection
......................................... 2-1
Option
03 Line Voltage and Fuse Selection ................................. 2-1
.............................................. PROM U38 Logic Table 3-37
Test Equipment Required
............................................. 4-2
DC Accuracy Limits
................................................. 4-7
Low-FrequencyCompensation Setup
..................................... 4-8
............................. Switch Combinations for A Trigger Checks (CH 1 )
4-13
.................................. Switch Combinations for B Trigger Checks 4-14
Switch Combinations for A Trigger Checks (CH 2)
............................. 4-14
Settingsfor Timing Accuracy Checks
..................................... 4-19
A Time Readout Accuracy ............................................ 4-20
Adjustment Interactions
.............................................. 5-3
Main Power Supply Tolerances and p-p Ripple
............................... 5-6
Vertical DC Accuracy Checks
.......................................... 5-13
Switch Combinations for A Trigger Checks (CH 1)
............................. 5-21
Switch Combinations for
B Trigger Checks .................................. 5-21
Switch Combinations for A Trigger Checks (CH 2)
............................. 5-21
A Time Linearity ................................................... 5-28
Settingsfor Timing Accuracy Checks
..................................... 5-30
A Time Readout Accuracy ............................................ 5-31
..............................................
A Trigger Holdoff Time 5-34
Relative Susceptibility to Static-DischargeDamage
............................ 6-1
External Inspection Checklist
.......................................... 6-3
Internal Inspection Checklist
........................................... 6-3
Suggested Troubleshooting Equipment
.................................... 6-8
MaintenanceAids
.................................................. 6-13
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2336 Service
OPERATORS SAFETY SUMMARY
The general safety information in this part of the summary is for both operating and servicing personnel. Specific warnings
and cautions willbe found throughout themanual wherethey apply and do not appear in this summary.
Terms in This Manual
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 a personal injury hazard not imme-
diately accessible as one reads the markings, or ahazardto
property, includingthe equipment itself.
DANGER indicates a personal injury hazard immediately
accessible as one reads the marking.
Symbols in
Symbols as
F
This Manual
This symbol indicates where applicable
cautionary or other information
is to be
found. For maximum input voltage
see
Table 1-1.
Marked on Equipment
DANGER - High voltage.
Protectiveground (earth)terminal.
ATTENTION
- Referto manual.
Power Source
This product is intended to operate from a power source
that does 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.
Groundingthe 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 receptable before con-
necting to the product input or output terminals. A
protective ground connection by way of the grounding
conductor inthe power cord
is essential for safe operation.
Danger Arising From Loss of Ground
Upon loss of the protective-ground connection, all acces-
sible conductive parts (including knobs and controls that
may appear to be insulating)can render an electric shock.
Use the Proper Power Cord
Use only the power cord and connector specified for
your product.
Use only apower cord that is ingood condition.
For detailed information on power cords and connectors
see Figure
2-2.
Use the Proper Fuse
To avoid fire hazard, use only a fuse of the correct type,
voltage rating and current rating as specified in the parts
list for your product.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate this product in an
explosive atmosphere unless
it has been specifically cer-
tified for such operation.
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product
covers or panels. Do not operate the product without the
covers and panels properly installed.

2336 Service
SERVICING SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to thepreceding OperatorsSafety Summary.
Do NotService Alone
Do not perform internal service or adjustment of this
product 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 componentswhile power
is on.
Disconnect power before removing protective panels,
soldering, or replacingcomponents.
Power Source
This product is intended to operate from a power source
that does 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.

2336 Service
viii
4118-01
The 2336 Oscilloscope.