Tektronix TBS1000 Series User manual

xx
TBS1000 Series
Digital Storage Oscilloscopes
ZZZ
Service Manual
*P077077201*
077-0772-01

TBS1000 Series
Digital Storage Oscilloscopes
ZZZ
Service Manual
xx
Revision B (20161230)
This document applies to TBS1000 models with no display
adapter module.
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 all safety summaries
prior to performing service.
www.tek.com
077-0772-01

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries
or suppliers, and are protected by national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication
supersedes that in all previously published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
OpenChoice is a registered trademark of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O. Box 50 0
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find contacts in your area.

Table of Contents
General safety summary .......................................................................................... vi
Service safety summary.......................................................................................... viii
Preface .............................................................................................................. ix
Manual Conventions.......................................................................................... ix
Related Documentation ...................................................................................... ix
Specifications
Specifications ..................................................................................................... 1-1
Signal Acquisition System Characteristics........... ............ .......................... ............ ... 1-1
Time Base System ........................................................................................... 1-6
Triggering System ........................................................................................... 1-8
Display Specifications..................................................................................... 1-12
Interfaces and Output Ports Specifications.............................................................. 1-13
Data Handling Characteristics............................................................................ 1-13
Power Distribution System ............................................................................... 1-13
Mechanical Characteristics ............................................................................... 1-14
Environmental Performance.............................................................................. 1-14
Data Logging System Characteristics ................................................................... 1-14
Limit Testing System Characteristics............. ............ ............ ............................... 1-15
WheretoFindOperatingInformation
Where to Find Operating Information.......................................................................... 2-1
Theory of Operation
Theory of Operation.............................................................................................. 3-1
System Level Block Diagrams ............................................................................. 3-1
Main Board................................................................................................... 3-3
Acquisition System ................ ................................ ...................... ............... 3-3
Processing and Display System ....................................................................... 3-4
Input Signal Interface................................................................................... 3-4
Probe Compensation.................................................................................... 3-4
External Trigger......................................................................................... 3-4
Main Board Power...................................................................................... 3-4
Power Supply................................................................................................. 3-4
Display Module.............................................................................................. 3-5
Front Panel ................................................................................................... 3-5
Two-Channel Oscilloscopes ............ ................ ................ ................ ............... 3-5
TBS1000 Series Oscilloscope Service Manual i

Table of Contents
Four-Channel Oscilloscopes ............ ........................................................ ....... 3-5
Performance Verification
Performance Verification ........................................................................................ 4-1
Required Equipment......................................................................................... 4-1
Test Record................................................................................................... 4-2
Performance Verification Procedures...................................................................... 4-3
Self Test.................................................................................................. 4-3
Self Calibration.......................................................................................... 4-3
Check DC Gain Accuracy.............................................................................. 4-3
Check Bandwidth ....................................................................................... 4-5
Check Sample Rate Accuracy and Delay Time Accuracy.......................................... 4-6
Check Edge Trigger Sensitivity ....................................................................... 4-7
Check External Edge Trigger Sensitivity............................................................. 4-9
Check Vertical Position Accuracy................................ ...................... ............. 4-10
Adjustment Procedures
Adjustment Procedures .......................................................................................... 5-1
Required Equipment......................................................................................... 5-1
Adjustment Procedure....................................................................................... 5-1
Enable the Service Menu............................................................................... 5-2
Adjustment Procedure.................................................................................. 5-4
Maintenance....................................................................................................... 6-1
Preventing ESD.............................................................................................. 6-1
Inspection and Cleaning..................................................................................... 6-1
General Care............................................................................................. 6-2
Interior Cleaning ........................................................................................ 6-2
Exterior Cleaning ....................................................................................... 6-2
Exterior Inspection...................................................................................... 6-3
Interior Inspection ...................................................................................... 6-3
Cleaning Procedure, Interior........................................................................... 6-4
Removal and Installation Procedures...................................................................... 6-6
Summary of Procedures................................................................................ 6-6
Required Tools .......................................................................................... 6-8
Rear Feet................................................................................................. 6-8
Flip Feet.................................................................................................. 6-9
Front-Panel Knobs...................................................................................... 6-9
Power Button............................................................................................ 6-9
Rear Case .............................................................................................. 6-10
Front Feet .............................................................................................. 6-11
ii TBS1000 Series Oscilloscope Service Manual

Table of Contents
Power Supply Module................................................................................ 6-12
Internal Assembly..................................................................................... 6-13
Front-Panel Cable..................................................................................... 6-15
Main Board Module (without the Display Adapter Module) .................................... 6-16
Display Module ....................................................................................... 6-19
Front-Panel Module................................................................................... 6-20
Keypad ................................................................................................. 6-21
Troubleshooting............................................................................................ 6-22
Adjustment After Repair............................................................................. 6-22
Required Tools and Equipment...................................................................... 6-22
Troubleshooting Tree................................................................................. 6-22
Probe Comp Output................................................................................... 6-27
Troubleshooting the Power Supply ................................................................. 6-28
Troubleshooting the Display......................................................................... 6-29
Troubleshooting the Front Panel .................................................................... 6-30
Troubleshooting the Main Board.................................................................... 6-33
Repackaging Instructions ................................................................................. 6-36
Diagrams .......................................................................................................... 7-1
Replaceable Parts
Replaceable Parts................................................................................................. 8-1
Parts Ordering Information ................................................................................. 8-1
Using the Replaceable Parts List........................................................................... 8-2
Parts Lists and Exploded Views............................................................................ 8-3
Appendix A: Example of a Vertical Position Accuracy Test Spreadsheet....................... .......... A-1
Sample Filled-In Vertical Position Accuracy Test Spreadsheet.... .................................... A-1
TBS1000 Series Oscilloscope Service Manual iii

Table of Contents
List of Figures
Figure 3-1: Module-level block diagram (2-channel) ........................................................ 3-1
Figure 3-2: Module-level block diagram (4-channel)........................................................ 3-2
Figure 4-1: Example of a line graph for the Vertical Position Accuracy test ................. ........... 4-13
Figure 5-1: Adjustment setups.................................................................................. 5-3
Figure 6-1: Locator for trim and cabinet removal (2-channel model shown).............................. 6-7
Figure 6-2: Locator for internal modules (2-channel model shown) ....................................... 6-7
Figure 6-3: Main board with the Display Adapter (refer to: Service Manual 077-0772-00) .......... 6-14
Figure 6-4: Instrument cable locations (Main Board without the Display Adapter Module) .......... 6-17
Figure 6-5: Oscilloscope troubleshooting tree (page 1 of 4).......... ..................................... 6-23
Figure 6-6: Oscilloscope troubleshooting tree (page 2 of 4).......... ..................................... 6-24
Figure 6-7: Oscilloscope troubleshooting tree (page 3 of 4).......... ..................................... 6-25
Figure 6-8: Oscilloscope troubleshooting tree (page 4 of 4).......... ..................................... 6-26
Figure 7-1: TBS1000 series block diagram ................................................................... 7-2
Figure 8-1: Exploded diagram, 2-channel models............................................................ 8-3
Figure 8-2: Exploded diagram, 4-channel models............................................................ 8-6
Figure 8-3: Power supply module, cables, and wires......................................................... 8-8
Figure 8-4: Exploded diagram, back case and trim......................................................... 8-10
iv TBS1000 Series Oscilloscope Service Manual

Table of Contents
List of Tables
Table 1-1: Signal acquisition system characteristics .................................. ............ ........... 1-1
Table 1-2: Time base system.................................................................................... 1-6
Table 1-3: Triggering system.................................................................................... 1-8
Table 1-4: Display specifications ............................................................................. 1-12
Table 1-5: Interfaces and output ports specifications....................................................... 1-13
Table 1-6: Data handling characteristics..................................................................... 1-13
Table 1-7: Power distribution system ........................................................................ 1-13
Table 1-8: Mechanical characteristics........................................................................ 1-14
Table 1-9: Environmental performance...................................................................... 1-14
Table 1-10: Data logging system characteristics............................................................ 1-15
Table 1-11: Limit testing system characteristics ........... ...................................... ........... 1-15
Table 4-1: Performance verification............................................................................ 4-1
Table 4-2: Test record............................................................................................ 4-2
Table 5-1: Required equipment................................................................................. 5-1
Table 5-2: Adjustment steps..................................................................................... 5-5
Table 6-1: External inspection checklist....................................................................... 6-3
Table 6-2: Internal inspection checklist........................................................................ 6-4
Table 6-3: Tools and equipment .............................................................................. 6-22
Table 6-4: Probe Comp output................................................................................ 6-27
Table 6-5: Troubleshooting the power supply............................................................... 6-28
Table 6-6: Troubleshooting the front panel – service....................................................... 6-30
Table 6-7: Troubleshooting the front panel – Service Diag................................................ 6-30
Table 6-8: Troubleshooting the front panel – Mfg. test.................................................... 6-30
Table 6-9: Expected signals at J202.......................................................................... 6-31
Table 6-10: Troubleshooting the Main board................................................................ 6-33
Table 6-11: List of error codes................................................................................ 6-34
Table 8-1: Replaceable parts list................................................................................ 8-2
Table 8-2: Replaceable parts list, 2-channel models.......................................................... 8-4
Table 8-3: Replaceable parts list, 4-channel models.......................................................... 8-7
Table 8-4: Replaceable parts list; power supply module, instrument cables, and wires.................. 8-8
Table 8-5: Replaceable parts list, back case and trim ...................................................... 8-11
Table A-1: Vertical position accuracy test spreadsheet................ .......................... ............ A-1
TBS1000 Series Oscilloscope Service Manual v

General safety summary
General safetysummary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
To avoid potential hazards, use this product only as specified.
Only qualified personnel should perform service procedures.
To avoid fire or personal
injury
Use proper power cord. Use only the power cord specified for this product and
certified for the country of use.
Connect and disconnect properly. Connect the probe output to the measurement
instrument before connecting the probe to the circuit under test. Connect the
probe reference lead to the circuit under test before connecting the probe input.
Disconnect the probe input and the probe reference lead from the circuit under test
before disconnecting the probe from the measurement instrument.
Ground the product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe all terminal ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Connect the probe reference lead to earth ground only.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum ratingofthatterminal.
Power disconnect. The power switch disconnects the product from the power
source. See instructions for the location. Do not block the power switch; it must
remain accessible to the user at all times.
Do not operate without covers. Do not operate this product with covers or panels
removed.
Do not operate with suspected failures. If you suspect that there is damage to this
product, have it inspected by qualified service personnel.
Avoid exposed circuitry. Do not touch exposed connections and components when
power is present.
vi TBS1000 Series Oscilloscope Service Manual

General safety summary
Do not operate in wet/damp conditions.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.
Provide proper ventilation. Refer to the manual's installation instructions for details
on installing the product so it has proper ventilation.
Terms in this manual These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION.Caution statements identify conditions or practices that could result in
damage to this product or other property.
Symbols and terms on the
product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read
the marking.
WARNING indicates an injury hazard not immediately accessible as you
read the marking.
CAUTION indicates a hazard to property including the product.
The following symbol(s) may appear on the product:
TBS1000 Series Oscilloscope Service Manual vii

Service safety summary
Service safetysummary
Only qualified personnel should perform service procedures. Read this Service
safety summary and the General safety summary before performing any service
procedures.
Do not service alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.
Disconnect power. To avoid electric shock, switch off the instrument power, then
disconnect the power cord from the mains power.
Use care when servicing with power on. Dangerous voltages or currents may exist
in this product. Disconnect power, remove battery (if applicable), and disconnect
test leads before removing protective panels, soldering, or replacing components.
To avoid electric shock, do not touch exposed connections.
viii TBS1000 Series Oscilloscope Service Manual

Preface
This service manual provides information to verify performance of, calibrate,
troubleshoot, disassemble, and replace parts on the TBS1000 Series Digital
Storage Oscilloscopes.
Unless noted otherwise, the term "oscilloscope" refers to all models in the
TBS1000 series.
Manual Conventions
This manual uses certain conventions that you should become familiar with
before attempting service.
Modules Throughout this manual, any replaceable component, assembly, or part is referred
to by the term module.
A module is composed of electrical and mechanical assemblies, circuit cards,
interconnecting cables, and user-accessible controls.
Replaceable Parts This manual refers to any field-replaceable assembly or mechanical part
specifically by its name or generically as a replaceable part. In general, a
replaceable part is any circuit board or assembly, such as the hard disk drive, or a
mechanical part, such as the I/O port connectors, that is listed in the replaceable
parts list.
Safety SymbolsandtermsrelatedtosafetyappearintheServiceSafetySummaryfound
at the beginning of this manual.
Related Documentation
To read about Use these documents
Installation and
Operation
The oscilloscope user manual, available on the Tektronix Web
site.Go to www.tektronix.com/manuals and search for the user
manual for your product (available in 11 languages).
Programmer
Commands
The oscilloscope programmer manual, available on the Tektronix
Web site. Go to www.tektronix.com/manuals and search for the
programmer manual for your product.
TBS1000 Series Oscilloscope Service Manual ix

Preface
x TBS1000 Series Oscilloscope Service Manual

Specifications

Specifications
These specifications apply to all TBS1000 series oscilloscopes. To verify that an
oscilloscope meets specifications, it must first meet the following conditions:
The oscilloscope must have been operating continuously for twenty minutes
within the specified operating temperature.
You must perform the Do Self Cal operation, accessible through the Utility
menu, if the operating temperature has changed by more than 5 °C (9 °F)
since the last time the Do Self Cal operation was performed.
The oscilloscope must be within the factory calibration interval of one year.
Specifications are provided in the following tables. All specifications are
guaranteed unless noted "typical." Specifications that are marked with the symbol
are checked in the Performance Verification section. (See page 4-1, Performance
Verification.)
Signal Acquisition System Characteristics
NOTE. All amplitude-related or modified specifications require 1X probe
attenuation factors unless otherwise specified. This is due to the way the displayed
sensitivity works. This does not affect actual methods of attachment. It only alters
the relationship between displayed scale factors and the specifications.
Table 1-1: Signal acquisition system characteristics
Characteristic Description
TBS1152
TBS1102
TBS1062
TBS1042
TBS1022
Two nominally identical channels, sampled
simultaneously.
Number of Input
Channels
TBS1154
TBS1104
TBS1064
Four nominally identical channels, sampled
simultaneously
Input Coupling DC, AC, or GND
Input Impedance, DC
Coupled
1MΩ±2%inparallelwith20pF±3pF
TBS1000 Series Oscilloscope Service Manual 1–1

Specifications
Table 1-1: Signal acquisition system characteristics (cont.)
Characteristic Description
At the front panel connector, 300 VRMS, Installation Category II; derate at 20 dB/decade above 100 kHz to
13 V peak AC at 3 MHz and above.
Maximum Input Voltage
Based on sinusoidal or DC input signal. The maximum viewable signal while DC coupled is ±50 V offset
±5 V/div at 4 divisions, or 70 V. AC coupling allows measuring signals on a DC level up to 300 V. For
nonsinusoidal waveforms, peak value must be less than 450 V. Excursions above 300 V should be less
than 100 ms in duration, and the duty factor is limited to < 44%. The RMS signal level must be limited to
300 V. If these values are exceeded, damage to the instrument may result.
8 bits except at 2 mV/divNumber of Digitized Bits
Displayed vertically with 25 digitization levels per division, 10 divisions dynamic range.
2 mV/div setting is generated by digital multiplication and the resolution is reduced. Given 100 levels
available, the resolution is >6.5 bits.
Sensitivity Range 2 mV/div to 5 V/div in 1-2-5 sequence with the probe attenuation set to 1X.
The Display Gain Variable function allows the user to vary the vertical display gain continuously over the
full range.
Display Gain Variable
Resolution is that of the coarse gain from which these data are constructed. Fine gain values (for
instance 120 mV/div) are acquired at the next higher coarse gain setting (in this case 200 mV/div).
The Display Gain Variable is achieved by digital multiplication of the data to obtain the settings between
the 1-2-5 gain settings.
Hard copy outputs to printer will be exactly the same as seen on screen even when the Display Gain
Variable is used.
However, WAVEFORM DATA obtained through the I/O interface is limited to the 1-2-5 gain settings.
1X, 10X, 20X, 50X, 100X, 500X, 1000X voltage attenuation.
5, 1, 500 m, 200 m, 20 m, 10 m, 1 m V/A current scale factor.
Probe Scale Factors
This adjusts the display scale factor of the instrument to accommodate various probe types.
Accuracy of the probe used must be added to the accuracy specifications of instrument.
No automatic probe interface is provided, so you must verify that the settings match the probe
characteristics. The probe check function allows setting of the proper attenuation for voltage probes.
Acquisition Modes Sample, Peak Detect, Average
Envelope mode not provided
Front panel settings are retained when the instrument power is turned off and on with the power switch.
The settings are retained when the line power is turned off and on.
Retained Front Panel
Settings
The instrument periodically saves front panel settings after settings are changed. There is a delay of
three seconds after the last change and before the storage of the settings in memory.
1–2 TBS1000 Series Oscilloscope Service Manual

Specifications
Table 1-1: Signal acquisition system characteristics (cont.)
Characteristic Description
All Units:
Channel 1 – Channel 2
Channel 2 – Channel 1
Channel 1 + Channel 2
Channel 1 * Channel 2 FFT
Math Modes
4 channel units (TBS1154, TBS1104, TBS1064)
Channel 3 – Channel 4
Channel 4 – Channel 3
Channel 3 + Channel 4
Channel 3 * Channel 4
Voltage Measurement
Functions
Mean, Cyc RMS, Peak-to-Peak, Max, Min, RMS, CursorRMS
This is the difference between the measured DC gain and the nominal DC gain, divided by the nominal
DC gain and expressed as a percent.
±3%, 5 V/div through 10 mV/div
√DC Gain Accuracy,
Sample or Average
Acquisition
±4%, 5 mV/div and 2 mV/div
DC Voltage
Measurement Accuracy,
Average Acquisition
Mode
Vertical position = 0: ±(3% of |reading| + 0.1 div + 1 mV)
Vertical position ≠0 and vertical scale = 2 mV/div to 200 mV/div: ±[3% of |reading + vertical position|
+ 1% of |vertical position| + 0. 2 div + 7 mV]
Vertical position ≠0 and vertical scale > 200 mV/div: ±[3% of |reading + vertical position| + 1% of
|vertical position| + 0.2 div + 175 mV]
Delta volts between any two averages of 16 waveforms acquired under the same setup and ambient
conditions.
Delta Volts Measurement
Accuracy, Average
Acquisition Mode (3% of |reading| + 0.05 div)
Analog Bandwidth Defined in Section 4.6 of IEEE std 1057. The difference between the upper and lower frequencies, at
which the amplitude response, as seen in the data record, is 0.707 (-3 dB) of the response seen in the
data record at the specified reference frequency. Specifies only the -3 dB point. It does not include
the in-band response.
TBS1000 Series Oscilloscope Service Manual 1–3

Specifications
Table 1-1: Signal acquisition system characteristics (cont.)
Characteristic Description
This is analog bandwidth when the instrument is DC coupled in sample or average mode. V/div values
are accurate for probe attenuation settings of 1X. No probe should be installed for these measurements.
System bandwidth is type tested to be equivalent to this specification with the provided probe in 10X
mode. Use Section 4.6.1 of IEEE 1057, with the reference frequency of 1 kHz at an amplitude of
5 divisions, driven from a 50 Ωsource with external termination at the input BNC (25 Ωeffective source).
TBS1154, TBS1152:
DC to ≥150 MHz for 5 mV/div through 5 V/div settings with bandwidth limit at full. < 5 mV/div settings
are limited to 20 MHz bandwidth.
TBS1104, TBS1102:
DC to ≥100 MHz for 5 mV/div through 5 V/div settings with bandwidth limit at full. < 5 mV/div settings
are limited to 20 MHz bandwidth.
TBS1064, TBS1062:
DC to ≥60 MHz for 5 mV/div through 5 V/div settings with the bandwidth limit at full. < 5 MV/div settings
are limited to 20 MHz bandwidth.
TBS1042:
DC to ≥40 MHz for 5 mV/div through 5 V/div settings with the bandwidth limit at full. < 5 mV/div settings
are limited to 20 MHz bandwidth.
√Analog Bandwidth,
DC Coupled, Sample or
Average
TBS1022:
DC to ≥25 MHz for 5 mV/div through 5 V/div settings with bandwidth limit at full. < 5 mV/div settings are
limited to 20 MHz bandwidth.
This is the analog bandwidth when the instrument is DC coupled. V/div values are accurate for probe
attenuation settings of 1X. No probe should be installed for these measurements.
TBS1154, TBS1152, TBS1104, TBS1102:
DC to ≥75 MHz for 5 mV/div through 5 V/div settings with the bandwidth limit at full. Settings less
than 5 mV/div are limited to 20 MHz bandwidth.
TBS1064, TBS1062:
DC to ≥50 MHz for 5 mV/div through 5 V/div settings with the bandwidth limit at full. Settings less
than 5 mV/div are limited to 20 MHz bandwidth.
TBS1042:
DC to ≥30 MHz for 5 mV/div through 5 V/div settings with the bandwidth limit at full. Settings less
than 5 mV/div are limited to 20 MHz bandwidth.
Analog Bandwidth, DC
Coupled, Peak Detect,
typical
TBS1022:
DC to ≥20 MHz for 5 mV/div through 5 V/div settings with the bandwidth limit at full.
Analog Bandwidth
Selections
20 MHz bandwidth limit ON/OFF
This is the upper frequency for Analog Bandwidth when the instrument has 20 MHz bandwidth limiting
turned on.
20 MHz
Upper-Frequency Limit,
20 MHz Bandwidth
Limited, typical
Bandwidth of all trigger paths are similarly limited, except the External Trigger, which is not affected
by BW Limit function. Each channel is separately limited, allowing different bandwidths on different
channels of the same instrument.
1–4 TBS1000 Series Oscilloscope Service Manual