Tektronix TDS2004, TDS1001, TDS2024, TDS2022, TDS2014 Service Manual

Service Manual

TDS1000 and TDS2000 Series
Digital Storage Oscilloscopes

071-1076-02

This document supports firmware version 1.00
and above.

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.tektronix.com

Copyright © Tektronix, Inc. 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 supercedes
that in all previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA

For product information, sales, service, and technical support:

H In North America, call 1-800-833-9200.
H Worldwide, visit www.tektronix.com to find contacts in your area.

Warranty 16

Tektronix warrants that the product will be free from defects in materials and workmanship for a period of three
(3) years from the date of original purchase from an authorized Tektronix distributor. If the product proves
defective during this warranty period, Tektronix, at its option, either will repair the defective product without
charge for parts and labor, or will provide a replacement in exchange for the defective product. Batteries are
excluded from this warranty. Parts, modules and replacement products used by Tektronix for warranty work may
be new or reconditioned to like new performance. All replaced parts, modules and products become the property
of Tektronix.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period and make suitable arrangements for the performance of service. Customer shall be
responsible for packaging and shipping the defective product to the service center designated by Tektronix,
shipping charges prepaid, and with a copy of customer proof of purchase. Tektronix shall pay for the return of the
product to Customer if the shipment is to a location within the country in which the Tektronix service center is
located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for
products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage
resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product;
b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any
damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been
modified or integrated with other products when the effect of such modification or integration increases the time
or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Table of Contents

Specifications

Operating Information

General Safety Summary vii...................................

Service Safety Summary ix....................................

Environmental Considerations xi...............................

Preface xiii...................................................

Related Manuals xiii.................................................

Certifications and Compliances 1--8.....................................

General Features 2--2.................................................

Installation 2--4......................................................

Power Cord 2--4.................................................

Security Loop 2--4................................................

Extension Modules 2--5...............................................

Functional Check 2--6................................................

Self Calibration 2--7..................................................

Default Setup 2--7...................................................

Theory of Operation

Main Board 3--4.....................................................

Power Supply 3--6...................................................

Display Module 3--6..................................................

Front Panel 3--6.....................................................

Extension Modules 3--7...............................................

Performance Verification

Required Equipment 4--1..............................................

Test Record 4--2.....................................................

Performance Verification Procedures 4--3.................................

Acquisition System 3--4...........................................

Processing and Display System 3--5..................................

Input Signal Interface 3--5..........................................

Probe Compensation 3--5..........................................

External Trigger 3--5..............................................

Main Board Power 3--5............................................

Two-Channel Oscilloscopes 3--6.....................................

Four-Channel Oscilloscopes 3--7....................................

LEDs 3--7......................................................

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

i

Table of Contents

Adjustment Procedures

Maintenance

Self Test 4--3....................................................

Self Calibration 4--3..............................................

Check DC Gain Accuracy 4--3......................................

Check Bandwidth 4--5.............................................

Check Sample Rate and Delay Time Accuracy 4--6......................

Check Edge Trigger Sensitivity 4--7..................................

Check External Edge Trigger Sensitivity 4--9...........................

Required Equipment 5--1..............................................

Adjustment Procedure 5--3.............................................

Enable the Service Menu 5--3.......................................

Adjustment Procedure 5--5.........................................

Preparation 6--1.....................................................

Preventing ESD 6--1..................................................

Inspection and Cleaning 6--2...........................................

General Care 6--2................................................

Inspection and Cleaning Procedures 6--2..............................

Removal and Installation Procedures 6--5.................................

Preparation 6--5..................................................

List of Modules 6--5..............................................

Summary of Procedures 6--6........................................

Required Tools 6--6...............................................

Rear Feet 6--7...................................................

Flip Feet 6--9....................................................

Front-Panel Knobs 6--10............................................

Power Button 6--10................................................

Rear Case 6--10...................................................

Front Feet 6--14...................................................

Power Supply Module 6--15.........................................

Internal Assembly 6--17............................................

Display Cable 6--19................................................

Front-Panel Cable 6--21............................................

Main Board Module 6--22...........................................

Display Module 6--24..............................................

Front-Panel Module 6--26...........................................

Keypad 6--28.....................................................

Front Case 6--30..................................................

ii

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Diagrams
Replaceable Parts

Table of Contents

Troubleshooting 6--31.................................................

Adjustment After Repair 6--31.......................................

Required Tools and Equipment 6--31..................................

Troubleshooting Tree 6--31..........................................

PROBE COMP Output 6--35........................................

Troubleshooting the Power Supply 6--35...............................

Troubleshooting the Display 6--36....................................

Troubleshooting the Backlight 6--38...................................

Troubleshooting the Front Panel 6--40.................................

Troubleshooting the Main Board 6--43.................................

Running Diagnostics 6--43..........................................

Troubleshooting Input Connections 6--43...............................

Using the Error Log 6--44...........................................

Repackaging Instructions 6--46..........................................

Packaging 6--46...................................................

Storage 6--46.....................................................

Parts Ordering Information 8--1.........................................

Module Servicing 8--1.............................................

Using the Replaceable Parts List 8--2.....................................

Abbreviations 8--2................................................

Mfr. Code to Manufacturer Cross Index 8--3...........................

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

iii

Table of Contents

List of Figures

Figure 2--1: Routing the power cord and security cable 2--4..........

Figure 2--2: Installing and removing an extension module 2--5........

Figure 3--1: Module-level block diagram (two channel) 3--2..........

Figure 3--2: Module-level block diagram (four channel) 3--3..........

Figure 5--1: Adjustment setups 5--4...............................

Figure 6--1: Removing the rear feet 6--7...........................

Figure 6--2: Installing the rear feet 6--8............................

Figure 6--3: Removing and installing the flip feet 6--9................

Figure 6--4: Removing and installing the rear case 6--11..............

Figure 6--5: Aligning the oscilloscope rear case 6--13.................

Figure 6--6: Removing and installing the front feet 6--14..............

Figure 6--7: Removing the power supply module 6--15................

Figure 6--8: Installing the power supply module 6--16................

Figure 6--9: Removing and installing the internal assembly 6--17.......

Figure 6--10: Removing the display cable 6--19......................

Figure 6--11: Installing the display cable 6--20.......................

Figure 6--12: Removing and installing the front-panel cable 6--21.......

Figure 6--13: Main board removal 6--23............................

Figure 6--14: Removing the display module 6--24....................

Figure 6--15: Installing the display module 6--25.....................

Figure 6--16: Removing the front-panel module 6--26.................

Figure 6--17: Installing the front-panel module 6--27.................

Figure 6--18: Removing and installing the keypad 6--28...............

Figure 6--19: Oscilloscope troubleshooting tree (1 of 3) 6--32...........

Figure 6--20: Oscilloscope troubleshooting tree (2 of 3) 6--33...........

Figure 6--21: Oscilloscope troubleshooting tree (3 of 3) 6--34...........

Figure 6--22: Measuring the backlight voltage 6--39..................

Figure 7--1: TDS1000 and TDS2000 series block diagram 7--2........

Figure 8--1: Exploded diagram 8--7...............................

iv

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

List of Tables

Table of Contents

Table 1--1: Oscilloscope specifications 1--1........................

Table 1--2: Oscilloscope general specifications 1--7..................

Table 2--1: Default settings 2--7..................................

Table 5--1: Required equipment 5--1.............................

Table 5--2: Adjustment steps 5--6................................

Table 6--1: Internal inspection check list 6--3......................

Table 6--2: List of procedures 6--6................................

Table 6--3: List of error codes 6--44...............................

Table 8--1: Parts list column descriptions 8--2......................

Table 8--2: Manufacturers cross index 8--3........................

Table 8--3: Replaceable parts list 8--4.............................

Table 8--4: Replaceable standard accessories 8--8...................

Table 8--5: Replaceable optional accessories 8--8...................

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

v

Table of Contents

vi

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.

Only qualified personnel should perform service procedures.

Injury Precautions

Use Proper Power Cord. To avoid fire hazard, use only the power cord specified
for this product.

Avoid Electric Overload. To avoid electric shock or fire hazard, do not apply a
voltage to a terminal that is outside the range specified for that terminal.

Avoid Overvoltage. To avoid electric shock or fire hazard, do not apply potential
to any terminal, including the common terminal, that varies from ground by more
than the maximum rating for that terminal.

Avoid Electric Shock. To avoid injury or loss of life, do not connect or disconnect
probes or test leads while they are connected to a voltage source.

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.

Connect the Probe Properly. The probe ground lead is at ground potential. Do not
connect the ground lead to an elevated voltage.

Do Not Operate Without Covers. To avoid electric shock or fire hazard, do not
operate this product with covers or panels removed.

Use Proper Fuse. To avoid fire hazard, use only the fuse type and rating specified
for this product.

Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not operate
this product in wet or damp conditions.

Do Not Operate in an Explosive Atmosphere. To avoid injury or fire hazard, do not
operate this product in an explosive atmosphere.

Product Damage

Precautions

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Use Proper Power Source. Do not operate this product from a power source that
applies more than the voltage specified.

Provide Proper Ventilation. To prevent product overheating, provide proper
ventilation.

Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.

vii

General Safety Summary

Symbols and Terms

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.

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.

Symbols on the Product. The following symbols may appear on the product:

Probe Safety

DANGER

High Voltage

Protective Ground

(Earth) Terminal

ATTENTION

Refer to Manual

Double

Insulated

A guard around the probe body provides a finger barrier for protection from
electric shock.

Finger guard

WARNING. To avoid electric shock when using the probe, keep fingers behind the
guard on the probe body, and do not touch metallic portions of the probe head
while it is connected to a voltage source.

Connect the probe to the oscilloscope and connect the ground terminal to ground
before you take any measurements.

viii

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Service Safety Summary

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, disconnect the main power by means
of the power cord or, if provided, the power switch.

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.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

ix

Service Safety Summary

x

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Environmental Considerations

This section provides information about the environmental impact of the
product.

Product End-of-Life

Handling

Observe the following guidelines when recycling an instrument or component:

Equipment Recycling. Production of this equipment required the extraction and
use of natural resources. The equipment may contain substances that could be
harmful to the environment or human health if improperly handled at the
product’s end of life. In order to avoid release of such substances into the
environment and to reduce the use of natural resources, we encourage you to
recycle this product in an appropriate system that will ensure that most of the
materials are reused or recycled appropriately.

The symbol shown to the left indicates that this product
complies with the European Union’s requirements
according to Directive 2002/96/EC on waste electrical and
electronic equipment (WEEE). For information about
recycling options, check the Support/Service section of the
Tektronix Web site (www.tektronix.com).

Mercury Notification. This product uses an LCD backlight lamp that contains
mercury. Disposal may be regulated due to environmental considerations. Please
contact your local authorities or, within the United States, the Electronics
Industries Alliance (www.eiae.org) for disposal or recycling information.

Restriction of Hazardous

Substances

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

This product has been classified as Monitoring and Control equipment, and is
outside the scope of the 2002/95/EC RoHS Directive. This product is known to
contain lead, cadmium, mercury , and hexavalent chromium.

xi

Environmental Considerations

xii

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Preface

Related Manuals

The service manual for the TDS1000- and TDS2000-Series Digital Storage
Oscilloscopes provides instructions to verify the performance of, calibrate,
troubleshoot, and repair the oscilloscopes to the module level.

Unless noted otherwise, the term “oscilloscope” refers to all of the models in the
TDS1000 and TDS2000 series.

These manuals contain additional documentation for the oscilloscopes:

Extension module

User manual

Language

English 071-1064-XX 071-0409-XX 071-1075-XX

French 071-1065-XX* 071-0483-XX

German 071-1067-XX* 071-0485-XX

Italian 071-1066-XX* 071-0484-XX

Spanish 071-1068-XX* 071-0482-XX

Portuguese 071-1070-XX* 071-0486-XX

Japanese 071-1069-XX* 071-0488-XX

Korean 071-1073-XX* 071-0491-XX

Simplified Chinese 071-1071-XX* 071-0489-XX

Traditional Chinese 071-1072-XX* 071-0490-XX

Russian 071-1074-XX* 071-0487-XX

*These manuals contain a language overlay for the front-panel controls.

part number

instructions part
number

Programmer manual
part number

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

xiii

Preface

xiv

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Specifications

Specifications

g

q

These specifications apply to all TDS1000- and TDS2000-series oscilloscopes.
To verify that an oscilloscope meets specifications, it must first meet the
following conditions:

H The oscilloscope must have been operating continuously for twenty minutes

within the specified operating temperature.

H You must perform the Do Self Cal operation, accessible through the Utility

menu, if the operating temperature changes by more than 5 °C.

H The oscilloscope must be within the factory calibration interval of one year.

Specifications begin in Table 1--1. All specifications are guaranteed unless noted
“typical.” Specifications that are marked with the n symbol are checked in the
chapter Performance Verification.

Table 1- 1: Oscilloscope specifications

Acquisition

Acquisition Modes Sample, Peak Detect, and Average

Acquisition Rate,
typical

Single Sequence Acquisition Mode Acquisition Stops After

Up to 180 waveforms per second, per channel (Sample acquisition mode, no measurements)

Sample, Peak Detect Single acquisition, all channels simultaneously

Average N acquisitions, all channels simultaneously. N is selectable from 4,

16, 64, and 128

Inputs

Input Coupling DC, AC, or GND

Input Impedance, DC
Coupled

P2200 Probe
Attenuation

Supported Probe
Attenuation Factors

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

1MΩ ±2% in parallel with 20 pF ±3pF

1X, 10X

1X, 10X, 100X, 1000X

1- 1

Specifications

g

C

ati

tBN

C

I

fth

val

x

ceeded,d

ama

cil

losc

a

y

Table 1- 1: Oscilloscope specifications (Cont.)

Inputs

Maximum Voltage Overvoltage Category* Maximum Voltage
Between Signal and

ommon

npu

Channel-to-Channel TDS1001 TDS1002, TDS2002, TDS2004 TDS1012, TDS2012, TDS2014, TDS2022, TDS2024
Common Mode
Rejection, typical

CAT I and CAT II 300 V

CAT III 150 V

RMS

RMS

Derate at 20 dB/decade above 100 kHz to 13 V peak AC at 3 MHz and above.

For non-sinusoidal waveforms, peak value must be less than 450 V. Excursion above 300 V should be less
than 100 ms duration.

RMS signal level including any DC component removed through AC coupling must be limited to 300 V.

ese

uesare e

100:1 at 60 Hz
20:1at20MHz

100:1 at 60 Hz
20:1at30MHz

ge to theos

ope m

result.

100:1 at 60 Hz
10:1at50MHz

Measured on MATH Ch1 -- Ch2 waveform, with test signal applied between signal and common of both
channels, and with the same VOLTS/DIV and coupling settings on each channel

Measured on MATH Ch3 -- Ch4 waveform for 4-channel models

Channel-to-Channel TDS1001 TDS1002, TDS2002, TDS2004 TDS1012, TDS2012, TDS2014 TDS2022, TDS2024
Crosstalk

≥ 100:1 at 20 MHz ≥ 100:1 at 30 MHz ≥ 100:1 at 50 MHz ≥ 100:1 at 100 MHz

Measured on one channel, with test signal applied between signal and common of the other channel, and
with the same VOLTS/DIV and coupling settings on each channel

Vertical

Digitizers 8-bit resolution (except when set to 2 mV/div), each channel sampled simultaneously

VOLTS/DIV Range 2 mV/div to 5 V/div at input BNC

Position Range 2 mV/div to 200 mV/div, ±2V

> 200 mV/div to 5 V/div, ±50 V

*

Refer to the Overvoltage Category description on page 1--10.

1- 2

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Table 1- 1: Oscilloscope specifications

n

AnalogBandwidth

g

(50s/divto5s/div**)

,

n

DCGainAccurac

y

n

DCMeasurement

Vertical

Specifications

n Analog Bandwidth

in Sample and Average
modes at BNC or with
P2200 probe,
DC Coupled

Analog Bandwidth in TDS1001 TDS1002, TDS2002, TDS2004 TDS1012, TDS2012, TDS2014, TDS2022, TDS2024
Peak Detect mode

typical

Selectable Analog Band­width Limit, typical

Lower Frequency
Limit, AC Coupled

Rise Time at BNC, TDS1001 TDS1002, TDS2002, TDS2004 TDS1012, TDS2012, TDS2014 TDS2022, TDS2024
typical

Peak Detect Response** Captures 50% or greater amplitude of pulses ≥12 ns wide typical (50 s/div to 5 s/div) in the center 8

n DC Gain Accuracy

n DC Measurement

Accuracy, Average
Acquisition Mode

TDS1001 TDS1002, TDS2002, TDS2004 TDS1012, TDS2012, TDS2014 TDS2022, TDS2024

40 MHz{*

20 MHz* (when vertical scale is set to < 5 mV)

30 MHz{* 50 MHz{* 75 MHz{*

**

,

20 MHz* (when vertical scale is set to < 5 mV)

20 MHz*

≤ 10 Hz at BNC
≤ 1 Hz when using a 10X passive probe

< 8.4ns <5.8ns <3.5ns <2.1ns

vertical divisions

±3% for Sample or Average acquisition mode, 5 V/div to 10 mV/div

±4% for Sample or Average acquisition mode, 5 mV/div and 2 mV/div

Measurement Type Accuracy

Average of ≥ 16 waveforms with vertical
position at zero

Average of ≥ 16 waveforms with vertical
position not at zero

60 MHz{* 100 MHz{* 200 MHz{*

0 °Cto+40°C(32°F
to 104 °F)

160 MHz{*
0 °Cto+50°C(32°F
to 122 °F)

±(3% × reading + 0.1 div + 1 mV) when 10 mV/div or greater
is selected

±[3% × (reading + vertical position) + 1% of vertical position
+0.2div]

Add 2 mV for settings from 2 mV/div to 200 mV/div
Add 50 mV for settings from > 200 mV/div to 5 V/div

Volts Measurement
Repeatability, Average
Acquisition Mode

{ When vertical scale is set to ≥ 5mV.
* Bandwidth reduced to 6 MHz with a 1X probe.
** The oscilloscope reverts to Sample mode when the SEC/DIV (horizontal scale) is set from 2.5 s/div to 5 ns/div on 1 GS/s models,

or from 2.5 s/div to 2.5 ns/div on 2 GS/s models. The Sample mode can still capture 10 ns glitches.

Delta volts between any two averages of ≥
16 waveforms acquired under same setup
and ambient conditions

±(3% × reading + 0.05 div)

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

1- 3

Specifications

idth)

g

Table 1- 1: Oscilloscope specifications (Cont.)

Horizontal

Sample Rate Range TDS2022, TDS2024 TDS1001, TDS1002, TDS2004, TDS1012, TDS2002,

TDS2012, TDS2014

5S/sto2GS/s 5S/sto1GS/s

Waveform Interpolation (sin x)/x

Record Length 2500 samples for each channel

SEC/DIV Range TDS2022, TDS2024 TDS1001, TDS1002, TDS2004, TDS1012, TDS2002,

TDS2012, TDS2014

2.5 ns/div to 50 s/div, in a 1, 2.5, 5 sequence 5 ns/div to 50 s/div, in a 1, 2.5, 5 sequence

n Sample Rate and

Delay Time Accuracy

Delta Time Measurement Conditions Accuracy
Accuracy (Full Band­w

Position Range 5ns/divto10ns/div (--4 div × s/div) to 20 ms

±50 ppm over any ≥1 ms time interval

Single-shot, Sample mode ±(1 sample interval + 50 ppm × reading + 0.6 ns)

> 16 averages ±(1 sample interval + 50 ppm × reading + 0.4 ns)

Sample interval = s/div ÷ 250

25 ns/div to 100 s/div (--4 div × s/div) to 50 ms

250 s/divto50s/div (--4 div × s/div) to 50 s

TDS2022, TDS2024

2.5 ns/div (--4 div × s/div) to 20 ms

1- 4

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Table 1- 1: Oscilloscope specifications

ggy

,

ggg

g

g

Trigger

Specifications

n Trigger Sensitiv-

ity, Edge Trigger Type

Trigger Sensitivity, Coupling Sensitivity
Edge Trigger Type

Trigger Level Range Source Range

Trigger Level Accura- Accuracies are for signals having rise and fall times ≥ 20 ns
cy, typical

SET LEVEL TO 50%,
typical

Default Settings,
Video Trigger

* Bandwidth reduced to 6 MHz with a 1X probe.

Coupling Sensitivity TDS1001, TDS1002,

TDS1012, TDS2002,
TDS2004, TDS2012, TDS2014

DC EXT 200 mV from DC to 100 MHz* 200 mV from DC to 100 MHz*

EXT/5 1 V from DC to 100 MHz* 1 V from DC to 100 MHz*

CH1, CH2,
CH3, CH4

AC Same as DC at 50 Hz and above

NOISE REJ Reduces the DC-coupled trigger sensitivity by 2 times for > 10 mv/div to 5 V/div

HF REJ Same as the DC-coupled limit from DC to 7 kHz, attenuates signals above 80 kHz

LF REJ Same as the DC-coupled limits for frequencies above 300 kHz, attenuates signals

below 300 kHz

CH1, CH2, CH3, and
CH4

EXT ±1.6 V

EXT/5 ±8V

Source Accuracy

Internal ±0.2 div × volts/div within ±4 divisions from center screen

EXT ±(6%ofsetting+40mV)

EXT/5 ±(6% of setting + 200 mV)

Operates with input signals ≥ 50 Hz

Coupling is AC and Auto except for a single sequence acquisition

±8 divisions from center of screen

1 div from DC to 10 MHz*, 1.5 div from 10 MHz to Full

TDS2022, TDS2024

350 mV from 100 MHz to 200 MHz*

1.75 V from 100 MHz to 200 MHz*

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

1- 5

Specifications

y,g

Table 1- 1: Oscilloscope specifications (Cont.)

Trigger

Sensitivity, Video Trig- Composite video signal
ger Type, typical

Signal Formats and
Field Rates, Video
Trigger Type

Holdoff Range 500 ns to 10 s

Pulse Width Trigger

Source Range

Internal Pk-pk amplitude of 2 divisions

EXT 400 mV

EXT/5 2V

Supports NTSC, PAL, and SECAM broadcast systems for any field or any line

Pulse Width
Trigger modes

Pulse Width
Trigger Point

Pulse Width Range Selectablefrom33nsto10s

Pulse Width
Resolution

Equal Guardband t > 330 ns: ±5% ≤ guardband < ±(5.1% + 16.5 ns)

Not Equal Guardband t > 330 ns: ±5% ≤ guardband < ±(5.1% + 16.5 ns)

Trigger Frequency Counter

Readout Resolution 6 digits

Accuracy (typical) ±51 ppm including all frequency reference errors and ±1 count errors

Frequency Range AC coupled, 10 Hz minimum to rated bandwidth

Trigger when < (Less than), > (Greater than), = (Equal), or ≠ (Not Equal);
Positive pulse or Negative pulse

Equal: The oscilloscope triggers when the trailing edge of the pulse crosses the trigger level.

Not Equal: If the pulse is narrower than the specified width, the trigger point is the trailing edge. Otherwise, the
oscilloscope triggers when a pulse continues longer than the time specified as the Pulse Width.

Less than: The trigger point is the trailing edge.

Greater than (also called time-out trigger): The oscilloscope triggers when a pulse continues longer than the
time specified as the Pulse Width.

16.5 ns or 1 part per thousand, whichever is larger

t ≤ 330 ns: guardband = ±16.5 ns

165 ns < t ≤ 330 ns: guardband = --16.5 ns/+33 ns

t ≤ 165 ns: guardband = ±16.5 ns

1- 6

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Table 1- 1: Oscilloscope specifications (Cont.)

Trigger Frequency Counter

Signal Source Pulse Width or Edge Trigger modes: all available trigger sources

The Frequency Counter measures trigger source at all times, including when the oscilloscope acquisition is
halted due to changes in the run status, or acquisition of a single shot event has completed.

Pulse Width Trigger mode: The oscilloscope counts pulses of significant magnitude inside the 250 ms
measurement window that qualify as triggerable events, such as narrow pulses in a PWM pulse train if set to <
mode and the width is set to a relatively small time.

Edge Trigger mode: The oscilloscope counts all edges of sufficient magnitude and correct polarity.

Video Trigger mode: The Frequency Counter does not operate.

Measurements

Cursors Voltage difference between cursors (ΔV)

Time difference between cursors (ΔT)
Reciprocal of ΔTinHertz(1/ΔT)

Automatic Measure­ments

Frequency, Period, Mean, Pk-Pk, Cycle RMS, Min, Max, Rise Time, Fall Time, Pos Width, Neg Width

Specifications

Table 1- 2: Oscilloscope general specifications

Display

Display Type 145 mm (5.7 in) diagonal liquid crystal

Display Resolution 320 horizontal by 240 vertical pixels

Display Contrast Adjustable, temperature compensated

Backlight Intensity, typical 65 cd/m

Probe Compensator Output

Output Voltage, typical 5Vinto≥ 1MΩ load

Frequency, typical 1 kHz

Power Source

Source Voltage 100 -- 120 VAC

120 -- 240 VAC

Power Consumption Less than 30 W

Fuse 1 A, T rating, 250 V

2

( 10%) from 45 Hz through 440 Hz, CAT II

RMS

( 10%) from 45 Hz through 66 Hz, CAT II

RMS

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

1- 7

Specifications

p

Table 1- 2:

Environmental

Temperature Operating 0 °Cto+50°C(32°F to 122 °F)

Cooling Method Convection

Humidity +40 °C or below

Altitude Operating and Nonoperating 3,000 m (10,000 ft)

Random Vibration Operating 0.31 g

Mechanical Shock Operating 50 g, 11 ms, half sine

Mechanical

Size Height 151.4 mm (5.96 in)

Weight (approximate) When packaged for domestic shipment 3.6kg(8.0lbs)

Oscilloscope general specifications (Cont.)

Nonoperating -- 4 0 °Cto+71°C(--40°F to 159.8 °F)

(+104 °F or below)

+41° Cto+50° C
(106 °F to 122 °F)

Nonoperating 2.46 g

Width 323.8 mm (12.75 in)

Depth 124.5 mm (4.90 in)

≤ 90% relative humidity

≤ 60% relative humidity

from 5 Hz to 500 Hz, 10 minutes on each axis

RMS

from 5 Hz to 500 Hz, 10 minutes on each axis

RMS

Certifications and Compliances

EN 61326. EMC requirements for Class A electrical equipment for measurement,
control, and laboratory use. Annex D.

H IEC 61000--4--2. Electrostatic discharge immunity

H IEC 61000--4--3. RF electromagnetic field immunity

H IEC 61000--4--4. Electrical fast transient / burst immunity

H IEC 61000--4--5. Power line surge immunity

H IEC 61000--4--6. Conducted RF Immunity

H IEC 61000--4--11. Voltage dips and interruptions immunity

EN 61000- 3- 2. AC power line harmonic emissions

EN 61000- 3- 3. Voltage changes, fluctuations, and flicker

1

Emissions which exceed the levels required by this standard may occur when this
equipment is connected to a test object.

1

1- 8

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Specifications

Australia / New Zealand

Declaration of Conformity

-EMC

EMC Compliance

FCC Compliance

Russian Federation

Peoples Republic of China

EC Declaration of

Conformity - Low Voltage

Complies with EMC provision of Radiocommunications Act per these stan­dard(s):

H AS/NZS 2064.1/2. Industrial, Scientific, and Medical Equipment: 1992

Meets the intent of Directive 89/336/EEC for Electromagnetic Compatibility
when it is used with the product(s) stated in the specifications table. Refer to the
EMC specification published for the stated products. May not meet the intent of
the directive if used with other products.

Emissions comply with FCC 47 CFR, Part 15, Subpart B for Class A equipment.

This product was certified by the GOST ministry of Russia to be in compliance
with all applicable EMC regulations.

This product has received the Chinese Metrology Certification. (CMC).

Compliance was demonstrated to the following specification as listed in the
Official Journal of the European Communities:

U.S. Nationally

Recognized Testing

Laboratory Listing

Canadian Certification

Additional Compliance

Low Voltage Directive 73/23/EEC, amended by 93/68/EEC.

H EN 61010-1:2001. Safety requirements for electrical equipment for

measurement control and laboratory use.

H EN 61010-2-031:2002. Particular requirements for handheld probe assem-

blies for electrical measurement and test equipment.

H UL 61010B--1:2004, 2nd Edition. Standard for electrical measuring and test

equipment.

H UL 61010B--2--031:2003. Particular requirements for handheld probe

assemblies for electrical measurement and test equipment.

H CAN/CSA C22.2 No. 1010.1:1997. Particular requirements for electrical

equipment for measurement, control, and laboratory use. Part 1.

H CAN/CSA C22.2 No. 61010--2--031:1994. Particular requirements for

handheld probe assemblies for electrical measurement and test equipment.

H IEC 61010--1:2001. Safety requirements for electrical equipment for

measurement, control, and laboratory use.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

1- 9

Specifications

H IEC 61010--031:2002. Particular requirements for handheld probe assemblies

for electrical measurement and test equipment.

Equipment Type

Pollution Degree

Descriptions

Test and measuring equipment.

A measure of the contaminates that could occur in the environment around and
within a product. Typically the internal environment inside a product is
considered to be the same as the external. Products should be used only in the
environment for which they are rated.

H Pollution Degree 1. No pollution or only dry, nonconductive pollution

occurs. Products in this category are generally encapsulated, hermetically
sealed, or located in clean rooms.

H Pollution Degree 2. Normally only dry, nonconductive pollution occurs.

Occasionally a temporary conductivity that is caused by condensation must
be expected. This location is a typical office/home environment. Temporary
condensation occurs only when the product is out of service.

H Pollution Degree 3. Conductive pollution, or dry, nonconductive pollution

that becomes conductive due to condensation. These are sheltered locations
where neither temperature nor humidity is controlled. The area is protected
from direct sunshine, rain, or direct wind.

H Pollution Degree 4. Pollution that generates persistent conductivity through

conductive dust, rain, or snow. Typical outdoor locations.

Pollution Degree

Installation (Overvoltage)

Category Descriptions

Overvoltage Category

1- 10

Pollution Degree 2 (as defined in IEC 61010-1). Note: Rated for indoor use only.

Terminals on this product may have different installation (overvoltage) category
designations. The installation categories are:

H Measurement Category IV . For measurements performed at the source of

low-voltage installation.

H Measurement Category III. For measurements performed in the building

installation.

H Measurement Category II. For measurements performed on circuits directly

connected to the low-voltage installation.

H Measurement Category I. For measurements performed on circuits not

directly connected to MAINS.

Overvoltage Category II (as defined in IEC 61010-1)

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Operating Information

Operating Information

TDS1000- and TDS2000-series oscilloscopes are two- or four-channel instru­ments in small, lightweight, benchtop chassis that you can use to take
ground-referenced measurements.

In addition to a list of general features, this chapter covers:

H How to install your product

H How to add extended functions

H How to perform a brief functional check

H How to use the self-calibration routine

H How to restore factory default settings

For more detailed information about oscilloscope operation, refer to your user
manual.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

2--1

Operating Information

General Features

Model Channels Bandwidth Sample rate Display

TDS1001 2 40 MHz 1.0 GS/s Monochrome

TDS1002 2 60 MHz 1.0 GS/s Monochrome

TDS1012 2 100 MHz 1.0 GS/s Monochrome

TDS2002 2 60 MHz 1.0 GS/s Color

TDS2004 2 60 MHz 1.0 GS/s Color

TDS2012 2 100 MHz 1.0 GS/s Color

TDS2014 4 100 MHz 1.0 GS/s Color

TDS2022 2 200 MHz 2.0 GS/s Color

TDS2024 4 200 MHz 2.0 GS/s Color

H Context-sensitive Help system

H Color or monochrome LCD display

H Selectable 20 MHz bandwidth limit

H 2500-point record length for each channel

H Autoset Menu

H Probe Check Wizard

H Cursors with readouts

H Trigger frequency readout

H Eleven automatic measurements

H Waveform averaging and peak detection

H Dual time base

H Math Fast Fourier Transform (FFT)

H Pulse Width trigger capability

H Video trigger capability with line-selectable triggering

H External trigger

2--2

H Setup and waveform storage

H Variable persistence display

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Operating Information

H RS-232, GPIB, and Centronics ports with the optional TDS2CMA Commu-

nications Extension Module

H User interface in ten user-selectable languages

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

2--3

Operating Information

Installation

Power Cord

Use only power cords designed for your oscilloscope. Use a power source that
delivers 90 to 264 VAC
must deliver 90 to 132 VAC

, 45 to 66 Hz. If you have a 400 Hz power source, it

RMS

, 360 to 440 Hz.

RMS

Refertopage8--8intheReplaceable Parts chapter for a list of power cords
available from Tektronix. All power cords must be rated for > 3 Amps, 3 wire,
and have an 18 AWG (1.0 mm) Safety Ground lead, or larger.

Securing cable

2--4

Security Loop

Power cable

Figure 2--1: Routing the power cord and security cable

Use the built-in cable channels to secure both your oscilloscope and extension
module to your location.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Extension Modules

Operating Information

You can increase the feature set of your oscilloscope by inserting an extension
module. Refer to page 8--8 for more information. Figure 2--2 shows the proper
way to install and remove a module without bending the connecting pins.

For more information on extension modules, see your oscilloscope user manual.

CAUTION. Electrostatic discharge (ESD) can damage components in the
extension module and the oscilloscope. Do not operate your instrument with the
extension module connector exposed.

Module release tab

Remove

extension

module

Install

extension

module

Figure 2--2: Installing and removing an extension module

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

2--5

Operating Information

Functional Check

Perform this quick functional check to verify that your oscilloscope is operating
correctly.

ON/OFF

button

PASSED

CH1

PROBE COMP

1. Turn on the oscilloscope.

Wait until the display shows that all power-on tests passed. Push the DEFAULT
SETUP button. The default Probe menu attenuation setting is 10X.

2. Set the switch to 10X on the P2200 probe and connect the oscilloscope probe to

channel 1. To do this, align the slot in the probe connector with the key on the
CH1 BNC, push to connect, and twist to the right to lock the probe in place.

Attach the probe tip and reference lead to the PROBE COMP connectors.

3. Push the AUTOSET button. Within a few seconds, you should see a square

wave in the display (approximately 5 V at 1 kHz peak-to-peak).

Move the probe to the CH2 BNC. Repeat step 3. For four-channel models,
repeat step 3 for CH3 and CH4. A similar test, described below, can be
performed on the EXT TRIG connector, although the amplitude scale factor is
undefined.

2--6

Connect the probe to the EXT TRIG BNC. Attach the probe tip and reference
lead to the PROBE COMP connectors. Push TRIG MENU and push the top
option button to select Edge triggering. Then, push the second option button to
select Ext as the source. Finally, push and hold the front-panel TRIG VIEW
button. Once again, you should see a square wave in the display.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Self Calibration

SEC/DIV50

0

Default Setup

Operating Information

The self-calibration routine lets you quickly optimize the oscilloscope signal path
for maximum measurement accuracy. You can run the routine at any time but you
should always run the routine if the ambient temperature changes by 5 _Cor
more.

To compensate the signal path, disconnect any probes or cables from the channel
input connectors. Then, press the UTILITY button and select the Do Self Cal
option. Follow the on-screen instructions to proceed.

Table 2--1 lists the state of the oscilloscope after you press DEFAULT SETUP.

NOTE. When you push the DEFAULT SETUP button, the oscilloscope displays
the CH1 waveform and removes all other waveforms.

Table 2--1: Default settings

Menu or system Option, button or knob Default setting

ACQUIRE Sample, Peak Detect, and

Average

Averages: 4, 8, 16, 64, and
128

RUN/STOP RUN

CURSOR Type Off

Source CH1

Horizontal (voltage) +/-- 3.2 divs

Vertical (time) +/-- 4 divs

DISPLAY Type Vectors

Persist Off

Format YT

HORIZONTAL Window Main

Trig Knob Level

POSITION 0.00 s

Sample

16

s

Window Zone

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

50 s

2--7

Operating Information

Sourc

e

CH1

Windo

w

Hanning

Table 2--1: Default settings (Cont.)

Menu or system Default settingOption, button or knob

MATH Operation CH1 -- CH2

FFT operation:

Window

FFT Zoom

MEASURE Source CH1

Type None

TRIGGER Mode Type Edge

Edge TRIGGER Type Edge

Source CH1

Slope Rising

Mode Auto

Coupling DC

LEVEL 0.00 V

Video TRIGGER Type Video

Source CH1

Polarity Normal

Sync All Lines

Standard NTSC

Pulse Width TRIGGER Type Pulse

Hanning

X1

2--8

Source CH1

When =

Set Pulse Width 1.00 ms

Polarity Positive

Mode Auto

Coupling DC

Vertical system,
all channels

Coupling DC

BW Limit

Volts/Div Coarse

Probe 10X

Invert Off

POSITION 0.00 divs (0.00 V)

VOLTS/DIV 1.00 V

Off

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

The DEFAULT SETUP button does not reset the following:

H Language option

H Saved setup files

H Saved reference waveform files

H Display contrast

H Calibration data

H Printer setup

H RS-232 setup

H GPIB setup

Operating Information

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

2--9

Operating Information

2--10

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Theory of Operation

Theory of Operation

This chapter describes the electrical operation of the TDS1000- and
TDS2000-series oscilloscopes to the module level. It describes the basic
operation of each functional circuit block shown in Figures 3--1 and 3--2. Of
necessity, the descriptions for the two and four channel units, and the color and
monochrome units, are slightly different.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

3--1

Theory of Operation

AC Line

Power Supply

3

AC Line In

Backlight Power

(Color)

P3

Backlight Power

(Mono)

Through

chassis

Front Panel

12

Probe Comp

Probe Comp

CH1

CH2

Signal

J300

J350

P53

GND

GND

J202

P/O J203

P/O J203

A1 Main

GND

DC Out

&Line

Trigger

DC In

LCD

18 Pins

J101

J201

J690

P131

50

11

(Color)

16

J1

2

(Mono)

12

Extension

Module

TDS1000 (Mono)

TDS2000 (Color)

J90
1

J902

9

J2

24

J4

Display

Backlight

Display Control

RS-232

GPIB

J380

EXT

TRIG

Figure 3--1: Module-level block diagram (two channel)

3--2

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

25

J3

CENTRONICS

AC Line

Theory of Operation

Power Supply

3

AC Line In

Through

chassis

Front Panel

J1

12

Probe Comp

Signal

Probe Comp

GND

GND

A1 Main

GND

J1

J104 P/O J203

J104 P/O J203

Backlight Power

(Mono)

Backlight Power

(Color)

DC Out

&Line

Trigger

J101

DC In

J201

LCD

18 Pins

Not used

P3

2

11

Color Display

J90
1

Backlight

J902

16

Display Control

CH1

CH2

CH3

CH4

EXT

TRIG

J300

J990

J350

J600

J650

J680

Figure 3--2: Module-level block diagram (four channel)

50

Extension

Module

J1

25

24

9

RS-232

GPIB

CENTRONICS

J2

J4

J3

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

3--3

Theory of Operation

Main Board

The main board of a four-channel oscilloscope is essentially 2, two-channel
oscilloscopes tied together through a common microprocessor, and some special
interconnects to support combining the display and trigger systems. For this
reason, the focus of the main board discussion will be the two-channel system,
with differences noted as necessary.

At a minimum, the main board contains attenuators, an amplifier ASIC, a
digitizer/trigger system ASIC, a signal processing/display/system services ASIC,
RAM, flash PROM, a microprocessor, and special power supplies. For a
four-channel oscilloscope, the attenuators and ASICs are duplicated. Most of the
other aspects of the circuitry remain unchanged.

Acquisition System

Signals from the CH 1, CH 2 and other input connectors pass through attenuators
and an AC-coupling switch to the amplifier ASIC. The EXT TRIG input has an
abbreviated version of this path, lacking some of the attenuator settings and the
AC coupling switch.

The amplifier ASIC contains buffers and variable gain amplifiers, as well as
filters that provide 20 MHz bandwidth limiting. The task of the amplifier ASIC is
to convert from a 1 MΩ single-ended environment in the front end to a much
lower impedance differential (and thus less noise-sensitive) environment for the
acquisition process. The amplifier ASIC assures that the input signal is amplified
to approximately the correct level to allow the fullest possible use of the digitizer.

The acquisition ASIC contains samplers and peak detectors for each input
channel, a common amplifier, an A/D converter, and the trigger logic. The
digitized waveform samples are transferred to the processing and display ASIC.
In four-channel systems, the two acquisition ASICs are interconnected so that a
trigger on one ASIC can cause a trigger on the other.

The processor system adds the microprocessor and flash PROM to the processing
and display system. The processor system interprets the front-panel control
changes detected by the display ASIC, provides control parameters based upon
user setting requests, computes waveform measurements, and manages the
extension module interface. Saved setups, waveforms, and calibration constants
are stored in nonvolatile memory (NVRAM). The processor system shares
DRAM with the display system.

3--4

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Theory of Operation

Processing and Display

System

Input Signal Interface

The processing and display system consists of the display ASIC, DRAM, and
system oscillator. Digitized acquisition samples are received by the display ASIC
and stored in DRAM. Once data are received by the display ASIC, various
corrections are applied, display rasterization is performed, and the waveform is
placed into a display buffer. At the same time, the waveform is being read from
the display buffers and written to the LCD. Additional circuitry in the display
ASIC supports scanning the front panel, handling DRAM refresh, providing the
processor clock, and performing various memory mapping tasks required by all
elementary microprocessor based systems. In a four-channel system, the two
display ASICs are interconnected so that one ASIC may provide display
information for the second.

The processing and display system handles some of the computational tasks.
Other tasks are performed by the processor system. Since all array processing is
performed in the processing and display system, no computations can be
performed that involve data from two different channel sets. Thus, subtracting
channel 3 data from channel 2 is prohibited. Channel 1 and Channel 2 data may
be combined in all of the supported ways.

BNC connectors are mounted on the main board for all signal inputs. The signal
inputs are compatible with the supplied P2200 probes.

Probe Compensation

External Trigger

Main Board Power

The PROBE COMP and ground terminals are provided for probe adjustment.

The EXT TRIG channel is processed on the chain containing the highest
numbered normal input channel.

To support various functions on the main board, a number of secondary power
supplies are generated. For the amplifier and acquisitions ASICs, the main board
creates a +2.5 V and --2.5 V supply. The +2.5 V supply is derived from the
+3.3 V logic supply. The --2.5 V supply is derived from the --4 V supply. A three
terminal regulator provides +5 V for option modules and the LCD display.

An additional power supply provides the LCD bias voltage which ranges from
+19 V to +28 V, depending on contrast setting and display type. This +28 V
supply has a temperature sensor on the front-panel board that varies the output
voltage of the supply to maintain contrast over a wide temperature range.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

3--5

Theory of Operation

Power Supply

Display Module

The main power supply module for the TDS1000- and TDS2000-series
oscilloscopes is a wide input range universal supply. It is capable of providing
about 17 W of power for the oscilloscope while allowing the input to run from
about +90 V to +264 V. Input frequency ranges from 47 Hz to 440 Hz, which
allows operation in virtually all countries in the world and in a number of
off-grid environments such as military power on aircraft.

The secondary supplies from the power supply and the approximate current
draws are listed in the table on page 6--35 with the associated connector pins on
J101.

For information on voltages used in the oscilloscope, refer to the Troubleshooting
section of this manual.

Front Panel

Two-Channel

Oscilloscopes

The display module is a standard passive liquid crystal display (LCD). The
monochrome unit is patterned with 320 columns by 240 rows, and has the
associated drivers and backlight. The backlight is based on a 5 mA side light
fluorescent tube.

The color unit is patterned with 320 columns x 3 sub-columns by 240 rows and
has associated drivers and backlight. The backlight is based upon a 5 mA top
light fluorescent tube which runs a higher voltage and is longer to provide
sufficient extra light to overcome the higher loss associated with the color filters.

You can access all of the switches, position encoders, and LEDs on the front-pan­el board of two-channel oscilloscopes. Additionally, an IC on the front-panel
board provides buffering and multiplexing of switch signals to the main board.
Two signals and a sense line are provided by the main board to support the front
panel. One of these lines resets the scan; a second clocks the scan to the next
position; and the sense line receives the current state of the selected switch or
encoder position.

For the encoders, some amount of debouncing occurs inside the front-panel IC.
All key debouncing is handled in the display ASIC on the main board.

3--6

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Theory of Operation

Four-Channel

Oscilloscopes

LEDs

Extension Modules

The front-panel board of the four channel units is effectively two panels in
parallel. The left side of the board is largely handled by the display ASIC for
channels 1 and 2. The right side of the board is handled by the channel 3 and 4
ASIC. Separate front-panel ICs support these data paths.

The LEDs are lighted to indicate an alternative use for the associated front-panel
knob. For more information, see the User Manual for this oscilloscope.

The LEDs are controlled by latching the value of the Channel 1--2 front panel
scan counter when the appropriate scan value is set.

Optional extension modules add the capability for the microprocessor to interface
with IEEE-488 (GPIB) controllers and RS-232 controllers, and provide a PC-like
parallel printer interface. These modules contain the necessary chips to provide
standard RS-232 and IEEE-488 states. The parallel port interface is controlled by
software without significant hardware assistance.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

3--7

Theory of Operation

3--8

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Performance Verification

Performance Verification

c

OscilloscopeCalibration

This chapter contains performance verification procedures for the specifications
marked with the n symbol. The following equipment, or a suitable equivalent,
is required to complete these procedures.

Required Equipment

Description

DC Voltage Source 17.5mVto7V,±0.5%

Leveled Sine Wave Generator 50 kHz and 200 MHz, ±3%

Time Mark Generator 10 ms period, ±10 ppm

Minimum
requirements

accuracy

amplitude accuracy

accuracy

Examples

Wavetek 9100 Universal
Calibration System with
Os

illoscopeCalibration

Module (Option 250)

Fluke 5500A Multi-product
Calibrator with Oscilloscope
Calibration Option (Option
5500A-SC)

50 Ω BNC Cable BNCmaletoBNCmale,

≈ 1 m (36 in) long

50 Ω BNC Cable BNCmaletoBNCmale,

≈ 25 cm (10 in) long

50 Ω Feedthrough
Termination

Dual Banana to BNC Adapter Banana plugs to BNC female Tektronix part number

BNC T Adapter BNC male to dual BNC

Splitter, Power Frequency range: DC to

Adapter (four required) Male N--to--female BNC Tektronix part number

Adapter Female N-- to--male BNC Tektronix part number

BNC male and female
connectors

female connectors

4 GHz. Tracking: >2.0%

Tektronix part number
012-0482-XX

Tektronix part number
012-0208-XX

Tektronix part number
011-0049-XX

103-0090-XX

Tektronix part number
103-0030-XX

Tektronix part number
015--0565--XX

103--0045--XX

103--0058--XX

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

4- 1

Performance Verification

Test Record

Serial
number

Test Passed Failed

Self Test

Oscilloscope tests Low limit Test result High limit

Channel 1 DC Gain Accuracy 5mV/div 33.6 mV 36.4 mV

Procedure performed by Date

200 mV/div 1.358 V 1.442 V

2V/div 13.58 V 14.42 V

Channel 2 DC Gain Accuracy 5mV/div 33.6 mV 36.4 mV

200 mV/div 1.358 V 1.442 V

2V/div 13.58 V 14.42 V

Channel 3 DC Gain Accuracy15mV/div 33.6 mV 36.4 mV

200 mV/div 1.358 V 1.442 V

2V/div 13.58 V 14.42 V

Channel 4 DC Gain Accuracy15mV/div 33.6 mV 36.4 mV

200 mV/div 1.358 V 1.442 V

2V/div 13.58 V 14.42 V

Channel 1 Bandwidth 2.12 V —

Channel 2 Bandwidth 2.12 V —

Channel 3 Bandwidth

Channel 4 Bandwidth

1

1

2.12 V —

2.12 V —

Sample Rate and Delay Time Accuracy -- 2 d i v s +2 divs

Channel 1 Edge Trigger Sensitivity Stable trigger —

Channel 2 Edge Trigger Sensitivity Stable trigger —

Channel 3 Edge Trigger Sensitivity

Channel 4 Edge Trigger Sensitivity

1

1

Stable trigger —

Stable trigger —

External Edge Trigger Sensitivity Stable trigger —

1

Channels 3 and 4 are only on four channel oscilloscopes.

4- 2

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Performance Verification Procedures

Before beginning these procedures, two conditions must first be met:

H The oscilloscope must have been operating continuously for twenty minutes

within the operating temperature range specified.

H You must perform the Self Calibration operation described below. If the

ambient temperature changes by more than 5 °C, you must perform the Self

Calibration operation again.

The time required to complete the entire procedure is approximately one hour.

WARNING. Some procedures use hazardous voltages. To prevent electrical shock,
always set voltage source outputs to 0 V before making or changing any
interconnections.

Performance Verification

Self Test

Self Calibration

Check DC Gain Accuracy

This internal procedure is automatically performed every time the oscilloscope is
powered on. No test equipment or hookups are required. Verify that no error
messages are displayed before continuing with this procedure.

The self calibration routine lets you quickly optimize the oscilloscope signal path
for maximum measurement accuracy. You can run the routine at any time, but
you should always run the routine if the ambient temperature changes by 5 _Cor
more.

1. Disconnect any probes or cables from the CH1 and CH2 input connectors.

2. Press the UTILITY button and select the Do Self Cal option to start the

routine. The routine takes approximately one minute to complete.

3. Verify that self calibration passed.

This test checks the DC gain accuracy of all input channels.

1. Set the DC voltage source output level to 0V.

2. Set up the oscilloscope using the following steps:

Press menu button Select menu option Select setting

1. DEFAULT SETUP — —

2. CH 1 Probe 1X

3. ACQUIRE Average 16

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

4- 3

Performance Verification

Press menu button Select settingSelect menu option

4. MEASURE

Source An unchecked channel

Type Mean

3. As shown below, connect the oscilloscope channel selected in the table to the

DC voltage source.

DC voltage

source

+--

Dual banana
to BNC
adapter

BNC cable

Digitizing oscilloscope

4. For each VOLTS/DIV setting listed below, perform the following steps:

a. Set the DC voltage source output level to the positive voltage listed and

then record the mean measurement as V

pos

.

b. Reverse the polarity of the DC voltage source and then record the mean

measurement as V

c. Calculate V

diff

=V

neg

pos

.

-- V

and then compare V

neg

to the accuracy

diff

limits in the table.

VOLTS/DIV setting DC voltage source output levels Accuracy limits for V

5mV/div +17.5 mV, --17.5 mV 33.6 mV to 36.4 mV

diff

4- 4

200 mV/div +700 mV, --700 mV 1.358 V to 1.442 V

2V/div +7.00 V, --7.00 V 13.58 V to 14.42 V

5. Set DC voltage source output level to 0V.

6. Disconnect the test setup.

7. Repeat steps 1 through 6 until all input channels have been checked.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Performance Verification

Check Bandwidth

This test checks the bandwidth of all input channels.

1. Set up the oscilloscope using the following steps:

Press menu button Select menu option Select setting

DEFAULT SETUP — —

CH 1 Probe 1X

ACQUIRE Average 16

TRIGGER Coupling Noise

MEASURE

Source An unchecked channel

Type Pk-Pk

2. As shown below, connect the oscilloscope channel selected in the table to the

leveled sine wave generator.

Leveled
sine wave
generator

Digitizing oscilloscope

Output

50 Ω feedthrough

BNC cable

terminator

3. Set the oscilloscope VOLTS/DIV to 500 mV/div.

4. Set the oscilloscope SEC/DIV to 10 s/div.

5. Set the leveled sine wave generator frequency to 50 k Hz.

6. Set the leveled sine wave generator output level so the peak-to-peak
measurement is between 2.98 V and 3.02 V.

7. Set the leveled sine wave generator frequency to:

H 40 MHz if you are checking a TDS1001

H 60 MHz if you are checking a TDS1002/2002/2004

H 100 MHz if you are checking a TDS1012/2012/2014

H 200 MHz if you are checking a TDS2022/2024.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

4- 5

Performance Verification

8. Set the oscilloscope SEC/DIV to 10 ns/div.

9. Check that the peak-to-peak measurement is ≥2.12 V.

10. Disconnect the test setup.

11. Repeat steps 1 through 10 until all input channels have been checked.

Check Sample Rate and

Delay Time Accuracy

This test checks the time base accuracy.

1. Set up the oscilloscope using the following steps:

Press menu button Select menu option Select setting

DEFAULT SETUP — —

CH 1 Probe 1X

2. Connect the oscilloscope to the time mark generator as shown below.

Time mark

generator

Output

BNC cable

Digitizing oscilloscope

50 Ω feedthrough
terminator

4- 6

3. Set the time mark generator period to 10 ms.

4. Set the oscilloscope VOLTS/DIV to 500 mV/div.

5. Set the oscilloscope Main SEC/DIV to 1ms/div.

6. Press SET LEVEL TO 50%.

7. Use the vertical POSITION control to center the test signal on screen.

8. Use the horizontal POSITION control to set the position to 10.00 ms.

9. Set the oscilloscope SEC/DIV to 250 ns/div.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Performance Verification

10. Check that the rising edge of the marker crosses the center horizontal
graticule line within ±2 divisions of center graticule.

NOTE. One division of displacement from graticule center corresponds to
a 25 ppm time base error.

11. Disconnect the test setup.

Check Edge Trigger

Sensitivity

This test checks the edge trigger sensitivity for all input channels.

1. Set up the oscilloscope using the following steps:

Press menu button Select menu option Select setting

DEFAULT SETUP — —

CH 1 Probe 1X

TRIGGER Mode Normal

ACQUIRE Sample —

MEASURE

Source An unchecked channel

Type Pk-Pk

2. As shown below, connect the oscilloscope channel selected in the table to the
leveled sine wave generator.

Leveled
sine wave
generator

Digitizing oscilloscope

Output

BNC cable

3. Set the oscilloscope VOLTS/DIV to 500 mV/div.

4. Set the oscilloscope SEC/DIV to 25 ns/div.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

50 Ω feedthrough
terminator

4- 7

Performance Verification

5. Set the leveled sine wave generator frequency to 10 MHz.

6. Set the leveled sine wave generator output level to approximately 500 mV

p-p

so that the measured amplitude is approximately 500 mV. (The measured
amplitude can fluctuate around 500 mV.)

7. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and

then check that triggering is stable.

8. Set the leveled sine wave generator frequency to

H 40 MHz if you are checking a TDS1001

H 60 MHz if you are checking a TDS1002/2002/TDS2004

H 100 MHz if you are checking a TDS1012/2012/2014

H 200 MHz if you are checking TDS2022/2024.

9. Set the oscilloscope SEC/DIV to 10 ns/div.

10. Set the leveled sine wave generator output level to approximately 750 mV

p-p

so that the measured amplitude is approximately 750 mV. (The measured
amplitude can fluctuate around 750 mV.)

11. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and

then check that triggering is stable.

12. Change the oscilloscope setup using the following step:

Press menu button Select menu option Select setting

TRIGGER Slope Falling

13. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and

then check that triggering is stable.

14. Change the oscilloscope setup using the following step:

Press menu button Select menu option Select setting

TRIGGER Slope Rising

15. Disconnect the test setup.

16. Repeat steps 1 through 15 until all input channels have been checked.

4- 8

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Performance Verification

Check External Edge

Trigger Sensitivity

This test checks the edge trigger sensitivity for the external trigger.

1. Set up the oscilloscope using the following steps:

Press menu button Select menu option Select setting

DEFAULT SETUP — —

CH 1 Probe 1X

TRIGGER

Source Ext

Mode Normal

ACQUIRE Sample —

MEASURE

Source CH1

Type Pk-Pk

2. Connect the oscilloscope to the leveled sine wave generator as shown below.

Leveled
sine wave

generator

Digitizing oscilloscope

Output

Power divider

Male SMA to
female BNC

SMA female-­to--female

3Pieces

3. Set the leveled sine wave generator frequency to

H 40 MHz if you are checking a TDS1001

H 60 MHz if you are checking a TDS1002/2002/TDS2004

H 100 MHz if you are checking a TDS1012/2012/2014

H 200 MHz if you are checking TDS2022/2024.

4. Set the oscilloscope VOLTS/DIV to 100 mV/div.

5. Set the oscilloscope SEC/DIV to 10 ns/div.

50 Ω

feedthrough

terminator

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

4- 9

Performance Verification

6. Set the sine wave generator output level so that CH1 indicates approximately
200 mV

so that the measured amplitude is approximately 200 mV.(The

p-p

measured amplitude can fluctuate around 200 mV.) The output level of the
sine wave generator will be approximately 400 mV.

7. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and
then check that triggering is stable.

8. For TDS2022 and TDS2024 models, set the sine wave generator frequency
to 200 MHz.

9. For TDS2022 and TDS2024 models, set the sine wave generator output level
for CH1 to approximately 350 mV

p-p

.

10. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and
then check that triggering is stable.

11. Change the oscilloscope setup using the following step:

Press menu button Select menu option Select setting

TRIGGER Slope Falling

12. Press SET LEVEL TO 50%. Adjust TRIGGER LEVEL as necessary and
then check that triggering is stable.

13. Change the oscilloscope setup using the following step:

Press menu button Select menu option Select setting

TRIGGER Slope Rising

14. Disconnect the test setup.

4- 10

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Adjustment Procedures

Adjustment Procedures

This chapter contains adjustment procedures for the TDS1000- and
TDS2000-series oscilloscopes.

Only qualified personnel should perform service procedures. Read the Service
Safety Summary and the General Safety Summary at the beginning of this manual
before performing any service procedures. Also refer to the chapter Operating
Information for information about using the TDS1000 and TDS2000 oscillo­scopes.

NOTE. The voltage references inside the TDS1000 and TDS2000 oscilloscopes
are very stable over time and should not require routine updates. Before
performing any procedure in this chapter, first verify that the oscilloscope does
not meet specifications. Refer to the chapter Performance Verification to verify
the specifications.

Required Equipment

The equipment described in Table 5--1, or a suitable equivalent, is required to
complete these procedures.

Table 5--1: Required equipment

Description Minimum requirements Examples

DC Voltage Source -- 20 V t o 2 0 V, ±0.1% accuracy Wavetek 9100 Universal Calibration

System with Oscilloscope
Calibration Module (Option 250)

Leveled Sinewave
Generator

50 Ω BNC Cable

50 Ω BNC Cable (two)

50 Ω Feedthrough
Termination

60 kHz and 200 MHz, ±0.6%
amplitude accuracy

BNCmaletoBNCmale,
≈ 1 m (36 in) long

BNCmaletoBNCmale,
≈ 25 cm (10 in) long

BNC male and female
connectors

Fluke 5500A Multi-product
Calibrator with Oscilloscope
Calibration Option
(Option 5500A-SC)

Tektronix part number 012-0482-00

Tektronix part number 012-0208-00

Tektronix part number 011-0049-01

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

5--1

Adjustment Procedures

Table 5--1: Required equipment (Cont.)

Description ExamplesMinimum requirements

Dual Banana to BNC
Adapter

Banana plugs to BNC female Tektronix part number 103-0090-00

BNC T One male and two female

BNC connectors

Tektronix part number 103-0030-00

5--2

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Adjustment Procedure

Adjustment Procedures

The adjustment procedure consists of 70 steps for the two-channel oscilloscope,
and 106 steps for the four-channel model. Each step requires an external voltage
source for new calibration constants.

Before performing the adjustment procedure, you must warm up the oscilloscope
for at least ten minutes in an ambient temperature between 20 °C and 30 °C.
Adjustments performed prior to warm-up or outside this temperature range may
result in poor performance.

If all steps in the procedure are completed successfully, a “Pass” message is
displayed and the new calibration constants take affect. If any step fails, the
procedure is aborted and the current calibration is not affected. You can choose to
abort the procedure at any step by selecting FCAL ABORT without affecting the
current calibration.

NOTE. While performing the adjustment procedure, keep in mind that some of the
steps take a significant amount of time (up to 5 minutes) to complete.

Enable the Service Menu

The equipment setups, shown in Figure 5--1, are required to complete the
adjustment procedure. Table 5--2 on page 5--6 lists the steps in the procedure
and the signal requirement for each step.

You must enable the Service menu to perform the adjustment procedure. To do
this:

1. Power on the oscilloscope.

2. Push the front-panel MEASURE button to access the MEASURE menu.

3. Push the top option button to access the Measure 1 menu.

4. Push and hold the front-panel SINGLE SEQ button.

5. Push and hold the front-panel AUTOSET button.

6. Wait at least two seconds.

7. Release the SINGLE SEQ button.

8. Release the AUTOSET button. A message appears in the lower left corner of

the screen stating “Service mode ON.”

9. Push the front-panel UTILITY button. The last item in the Utility menu is
now Service.

After the adjustment is complete, disable the Service menu by pushing the
UTILITY front-panel button, and the Service and Service Mode Off option
buttons.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

5--3

Adjustment Procedures

DC voltage setup 1

DC voltage source

+--

Dual banana to
BNC adapter

BNC cable

BNC cable

Two Channel

Digitizing oscilloscope

10-inch

BNC cables

BNC ‘T’ connector

Four Channel

Digitizing oscilloscope

10-inch

BNC cables

10-inch

BNC cable

BNC ‘T’
connector

10-inch BNC cable

10-inch

BNC cables

BNC ‘T’

connectors

DC voltage setup 2

Sinewave generator setup

Leveled sine

wave generator

Output

50 Ω feedthrough terminator

(Table 5--2 and 5--3 list

DC voltage source

+--

Two Channel

Digitizing oscilloscope

proper channel)

Dual banana to
BNC adapter

Two Channel

Digitizing oscilloscope

BNC cable

Edge setup

Square wave

generator

Four Channel

Digitizing oscilloscope

Output

50 Ω feedthrough terminator

(Table 5--2 and 5--3 list

proper channel)

BNC cable

Figure 5--1: Adjustment setups

5--4

BNC cable

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Adjustment Procedures

Adjustment Procedure

Use this procedure to load new calibration constants.

1. Enable the Service menu as described on page 5--3.

2. Push the Service option button.

3. Push the Factory Cal option button.

4. Push the Warmup Timer option button.

5. Push the Start Timer option button to ensure a 10-minute warm up. After 10

minutes passes, the oscilloscope displays a large black or green cross.

6. Press the front-panel UTILITY button and push the Service option button.

7. Push the Factory Cal option button.

8. Push the FCAL INIT option button to initiate the factory calibration routine.

You are now in step 1 of the procedure.

9. As indicated by Step 1 in Table 5--2, connect a 0.0 V

source to the channel

DC

inputs.

10. Press FCAL STEP to load the calibration constant for step 1.

11. Follow the screen prompts along with Table 5--2 for the remainder of the

routine, applying the proper signal for each step.

NOTE. During some steps, the oscilloscope may appear to be idle for several
minutes while it is processing information internally. You must wait for the screen
prompt to continue.

If any step in the procedure fails, the procedure terminates. Failure will result
if an incorrect signal source is connected. If this happens, you must start the
procedure over from the beginning.

If the procedure completes successfully, a “Pass” message is displayed and
the new adjustment takes effect.

12. Compensate the signal path by performing the self-calibration routine.
Disconnect any probes or cables from the channel input connectors. Then,
press the UTILITY button and select Do Self Cal to confirm that you are
ready to proceed.

13. Disable the Service menu option by pushing the UTILITY front-panel
button, and the Service and Service Mode Off option buttons.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

5--5

Adjustment Procedures

g

Table 5--2: Adjustment steps

Step
Two-channel
models

Refer to the DC voltage setup 1 diagram

1 1 DC Voltage 1 0.0 V

2 2 DC Voltage 1 --20.0 V

3 3 DC Voltage 1 -- 2 . 0 V

4 4 DC Voltage 1 -- 1 . 6 V

5 5 DC Voltage 1 -- 1 . 2 V

6 6 DC Voltage 1 -- 0 . 8 V

7 7 DC Voltage 1 -- 0 . 4 V

8 8 DC Voltage 1 --0.32 V

9 9 DC Voltage 1 -- 0 . 2 V

10 10 DC Voltage 1 --0.16 V

11 11 DC Voltage 1 --0.08 V

12 12 DC Voltage 1 --0.04 V

13 13 DC Voltage 1 --0.03 V

14 14 DC Voltage 1 --0.02 V

15 15 DC Voltage 1 --0.015 V

16 16 DC Voltage 1 0.015 V

17 17 DC Voltage 1 0.02 V

18 18 DC Voltage 1 0.03 V

19 19 DC Voltage 1 0.04 V

20 20 DC Voltage 1 0.08 V

21 21 DC Voltage 1 0.16 V

22 22 DC Voltage 1 0.2 V

23 23 DC Voltage 1 0.32 V

24 24 DC Voltage 1 0.4 V

25 25 DC Voltage 1 0.8 V

26 26 DC Voltage 1 1.2 V

27 27 DC Voltage 1 1.6 V

28 28 DC Voltage 1 2.0 V

29 29 DC Voltage 1 20.0 V

30 30 DC Voltage 1 0.0 V

Step
Four-channel
models

Signal Signal source setting Input

CH1 through
CHx

5--6

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Table 5--2: Adjustment steps (Cont.)

S

i

O

hmBWL

V

5050SinewaveGenerator,50OhmBW

L,2.5

V

p-p

5151SinewaveGenerator,50OhmBW

L,5

V

p-p

Adjustment Procedures

Step
Two-channel
models

Step
Four-channel
models

Refer to the DC voltage setup 2 diagram

31 31 DC Voltage 2 -- 5 . 0 V

32 32 DC Voltage 2 -- 1 . 0 V

33 33 DC Voltage 2 1.0 V

34 34 DC Voltage 2 5.0 V

Refer to the Sinewave generator setup diagram. BWL refers the maximum bandwidth of the oscilloscope.

35 35 Sinewave Generator, 50 Ohm 5 kHz, 1 V

36 36 Sinewave Generator, 50 Ohm 1 MHz, 100 mV

37 37 Sinewave Generator, 50 Ohm 1MHz,1V

38 38 Sinewave Generator, 50 Ohm 50 kHz, 1 V

39 39 Sinewave Generator, 50 Ohm 20 MHz, 1 V

40 40

newaveGenerator, 50

41 41 Sinewave Generator, 50 Ohm BWL, 50 mV

42 42 Sinewave Generator, 50 Ohm BWL, 100 mV

43 43 Sinewave Generator, 50 Ohm BWL, 250 mV

44 44 Sinewave Generator, 50 Ohm BWL, 500 mV

45 40 Sinewave Generator, 50 Ohm BWL, 1 V

46 46 Sinewave Generator, 50 Ohm 5 kHz, 2.5 V

47 47 Sinewave Generator, 50 Ohm 1MHz,2.5V

48 48 Sinewave Generator, 50 Ohm 50 kHz, 2.5 V

49 49 Sinewave Generator, 50 Ohm 20 MHz, 2.5 V

,25m

p-p

p-p

p-p

p-p

p-p

p-p

p-p

p-p

p-p

p-p

p-p

p-p

p-p

p-p

p-p

InputSignal source settingSignal

EXT TRIG

CH1

52 52 Sinewave Generator, 50 Ohm BWL, 1.6 V

53 53 Edge, 50 Ohm. Refer to Edge setup

1 kHz, 0 to --800 mV

p-p

diagram.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

5--7

Adjustment Procedures

S

i

O

hmBWL

V

6969SinewaveGenerator,50OhmBW

L,2.5

V

p-p

7070SinewaveGenerator,50OhmBW

L,5

V

p-p

Table 5--2: Adjustment steps (Cont.)

Step
Two-channel
models

54 54 Sinewave Generator, 50 Ohm 5 kHz, 1 V

Step
Four-channel
models

p-p

55 55 Sinewave Generator, 50 Ohm 1 MHz, 100 mV

56 56 Sinewave Generator, 50 Ohm 1MHz,1V

57 57 Sinewave Generator, 50 Ohm 50 kHz, 1 V

58 58 Sinewave Generator, 50 Ohm 20 MHz, 1 V

59 59

newaveGenerator, 50

60 60 Sinewave Generator, 50 Ohm BWL, 50 mV

,25m

p-p

p-p

p-p

p-p

p-p

61 61 Sinewave Generator, 50 Ohm BWL, 100 mV

62 62 Sinewave Generator, 50 Ohm BWL, 250 mV

63 63 Sinewave Generator, 50 Ohm BWL, 500 mV

64 64 Sinewave Generator, 50 Ohm BWL, 1 V

65 65 Sinewave Generator, 50 Ohm 5 kHz, 2.5 V

66 66 Sinewave Generator, 50 Ohm 1MHz,2.5V

p-p

p-p

p-p

67 67 Sinewave Generator, 50 Ohm 50 kHz, 2.5 V

68 68 Sinewave Generator, 50 Ohm 20 MHz, 2.5 V

InputSignal source settingSignal

CH2

p-p

p-p

p-p

p-p

p-p

p-p

5--8

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Table 5--2: Adjustment steps (Cont.)

S

i

O

hmBWL

V

86SinewaveGenerator,50OhmBW

L,2.5

V

p-p

87SinewaveGenerator,50OhmBW

L,5

V

p-p

Adjustment Procedures

Step
Two-channel
models

NA

Step
Four-channel
models

71 Sinewave Generator, 50 Ohm 5 kHz, 1 V

p-p

72 Sinewave Generator, 50 Ohm 1 MHz, 100 mV

73 Sinewave Generator, 50 Ohm 1MHz,1V

74 Sinewave Generator, 50 Ohm 50 kHz, 1 V

75 Sinewave Generator, 50 Ohm 20 MHz, 1 V

76

newaveGenerator, 50

77 Sinewave Generator, 50 Ohm BWL, 50 mV

,25m

p-p

p-p

p-p

p-p

p-p

78 Sinewave Generator, 50 Ohm BWL, 100 mV

79 Sinewave Generator, 50 Ohm BWL, 250 mV

80 Sinewave Generator, 50 Ohm BWL, 500 mV

81 Sinewave Generator, 50 Ohm BWL, 1 V

82 Sinewave Generator, 50 Ohm 5 kHz, 2.5 V

83 Sinewave Generator, 50 Ohm 1MHz,2.5V

p-p

p-p

p-p

84 Sinewave Generator, 50 Ohm 50 kHz, 2.5 V

85 Sinewave Generator, 50 Ohm 20 MHz, 2.5 V

InputSignal source settingSignal

CH3

p-p

p-p

p-p

p-p

p-p

p-p

88 Sinewave Generator, 50 Ohm BWL, 1.6 V

89 Edge, 50 Ohm. Refer to Edge setup

1 kHz, 0 to --800 mV

diagram.

p-p

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

5--9

Adjustment Procedures

S

i

O

hmBWL

V

W

L

V

p-p

105SinewaveGenerato

r,50OhmBW

L,2.5

V

p-p

W

L,5V

p-p

106SinewaveGenerato

r,50OhmBW

L,5

V

p-p

Table 5--2: Adjustment steps (Cont.)

Step
Two-channel
models

NA

Step
Four-channel
models

90 Sinewave Generator, 50 Ohm 5 kHz, 1 V

p-p

91 Sinewave Generator, 50 Ohm 1 MHz, 100 mV

92 Sinewave Generator, 50 Ohm 1MHz,1V

93 Sinewave Generator, 50 Ohm 50 kHz, 1 V

94 Sinewave Generator, 50 Ohm 20 MHz, 1 V

95

newaveGenerator, 50

96 Sinewave Generator, 50 Ohm BWL, 50 mV

,25m

p-p

p-p

p-p

p-p

p-p

97 Sinewave Generator, 50 Ohm BWL, 100 mV

98 Sinewave Generator, 50 Ohm BWL, 250 mV

99 Sinewave Generator, 50 Ohm BWL, 500 mV

100 Sinewave Generator, 50 Ohm BWL, 1 V

101 Sinewave Generator, 50 Ohm 5 kHz, 2.5 V

102 Sinewave Generator, 50 Ohm 1MHz,2.5V

p-p

p-p

p-p

103 Sinewave Generator, 50 Ohm 50 kHz, 2.5 V

InputSignal source settingSignal

CH4

p-p

p-p

p-p

p-p

p-p

104 Sinewave Generator, 50 Ohm 20 MHz, 2.5 V

105 Sinewave Generator, 50 Ohm B

,2.5

106 Sinewave Generator, 50 Ohm B

p-p

5--10

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

Maintenance

Preparation

This chapter contains the information needed to do periodic and corrective
maintenance on the oscilloscope. The following sections are included:

H Preparation tells you how to get ready to do oscilloscope maintenance.

H Preventing ESD provides general information on preventing damage to

internal modules when doing maintenance.

H Inspection and Cleaning provides procedures for inspecting the oscilloscope

and cleaning its external and internal modules.

H Removal and Installation Procedures provides procedures for the removal

and installation of modules.

H Troubleshooting provides information for isolating failed modules.

H Repackaging Instructions provides packaging information for shipment or

storage.

Preventing ESD

Only qualified personnel should perform service procedures. Read the Service
Safety Summary and the General Safety Summary sections of this manual before
performing any service procedures. Also refer to the chapter Operating Informa­tion and your oscilloscope user manual for information about using the oscillo-

scope.

When performing any service which requires internal access to the oscilloscope,
adhere to the following precautions. These precautions will help you avoid
damaging internal modules and their components due to electrostatic discharge
(ESD).

CAUTION. Static discharge can damage any semiconductor component in this
oscilloscope.

H Minimize handling of static-sensitive modules.

H Transport and store static-sensitive modules in their static protected

containers or on a metal rail. Label any package that contains static-sensitive
modules.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

6--1

Maintenance

Inspection and Cleaning

H Discharge the static voltage from your body by wearing a grounded antistatic

wrist strap while handling these modules.

H Service static-sensitive modules only at static-free workstations. Do not

allow anything capable of generating or holding a static charge on the
workstation surface.

H Handle circuit boards by the edges when possible.

H Do not slide the modules over any surface.

H Avoid handling modules in areas that have a floor or work-surface covering

capable of generating a static charge.

This section describes how to inspect for dirt and damage, and how to clean the
oscilloscope. Inspection and cleaning are done as preventive maintenance which,
when done regularly, may prevent malfunctions and enhance reliability.

General Care

Inspection and Cleaning

Procedures

Preventive maintenance consists of visually inspecting and cleaning the
oscilloscope, and using general care when operating it. Perform preventive
maintenance more often if you operate the oscilloscope in a severe environment.
A good time to perform preventive maintenance is just before adjustment of the
oscilloscope.

For optimum performance, follow these recommendations:

H Protect the oscilloscope from adverse weather conditions. The oscilloscope is

not waterproof.

H Do not store or leave the oscilloscope where the liquid crystal display (LCD)

will be exposed to direct sunlight or high humidity for long periods of time.

H The front and rear cases help keep dust out of the oscilloscope and must be in

place during normal operation.

H To avoid damage to the oscilloscope or probes, do not expose them to any

sprays, liquids, or solvents.

The collection of dirt on internal components can cause them to overheat and
fail. Dirt also provides an electrical conduction path that could cause an oscillo­scope failure, especially under high-humidity conditions. Inspect and clean the
oscilloscope and probes as often as operating conditions require.

6--2

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

Inspection, Exterior. Inspect the outside of the oscilloscope for damage, wear, and
missing parts. Oscilloscopes that appear to have been dropped or otherwise
abused should be checked thoroughly to verify correct operation and perfor­mance. Immediately repair defects that could cause personal injury or lead to
further damage to the oscilloscope.

Cleaning Procedure, Exterior. To clean the oscilloscope exterior and probes:

1. Remove loose dust on the outside of the oscilloscope and probes with a
lint-free cloth. Use care to avoid scratching the clear glass display shield.

2. Use a soft cloth dampened with water to clean the oscilloscope, or use a 75%
isopropyl alcohol solution for more efficient cleaning.

CAUTION. To prevent getting moisture inside the oscilloscope during external
cleaning, use only enough liquid to dampen the cloth or applicator.

To avoid damage to the surface of the oscilloscope or probes, do not use any
abrasive or chemical cleaning agents.

Inspection, Interior. Inspect and clean the interior if it appears that the oscillo­scope may have been damaged or exposed to an unusually dirty environment.

To inspect and clean the interior, disassemble the oscilloscope by completing
each of the disassembly procedures in the order given starting on page 6--6.

Inspect the internal portions of the oscilloscope for damage and wear using
Table 6--1 as a guide. Repair defects immediately.

Table 6--1: Internal inspection check list

Item Inspect for Repair action

Front and
Rear Case

Circuit boards Loose, broken, or corroded solder connec-

Solder
connections

Wiring and
cables

Cracks or deformations. Scratched lettering
or display filter. Loose connectors or labels.

tions. Burned circuit boards. Burned,
broken, or cracked circuit-run plating.

Cold solder or rosin joints. Resolder joint and clean with

Loose plugs or connectors. Burned, broken,
or frayed wiring.

Repair or replace defective
hardware.

Remove failed module and
replace with a new module.

isopropyl alcohol.

Firmly seat connectors. Repair or
replace modules with defective
wires or cables.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

6--3

Maintenance

Cleaning Procedure, Interior. To clean the oscilloscope interior, perform the
following steps:

1. Blow off dust with dry, low-pressure, deionized air (approximately 9 psi).

2. Remove any remaining dust with a lint-free cloth dampened in isopropyl

alcohol (75% solution) and then wipe with a lint-free cloth dampened with
warm deionized water. A cotton-tipped applicator is useful for cleaning in
narrow spaces and on circuit boards.

STOP. If, after performing steps 1 and 2, a module is clean upon inspection, skip
steps 3 and 4. Proceed with step 5.

If steps 1 and 2 do not remove all the dust or dirt, all modules in the oscilloscope
except the Display Module and Front Panel Module may be spray washed using
a solution of 75% isopropyl alcohol.

Extensive cleaning of the Display Module is difficult because water must not be
trapped between the display shield and the display. The polarizers integrated into
the display degrade with long-term exposure to water. The display shield and
display must be replaced as an assembly if significant moisture or debris become
trapped inside. Cotton tipped applicators and lint-free rags moistened in
isopropyl alcohol and/or deionized water offer the best cleaning with the least
opportunity for damage to the assembly.

The Front Panel module can be damaged by deposition of film or debris inside
the knob encoders. To avoid this, care must be taken to not drip liquid or blow
debris into the encoders.

Proceed to step 3.

3. Spray wash dirty parts with the 75% isopropyl alcohol solution and wait 60
seconds for the majority of the alcohol to evaporate.

4. Use hot (49 _Cto60_C / 120 _F to 140 _F) deionized water to thoroughly
rinse the parts.

5. Dry all parts with low-pressure, deionized air.

6. Dry all components and assemblies in an oven or drying compartment using

low-temperature (52 _Cto66_C / 125 _F to 150 _F) circulating air.

Lubrication. Periodic lubrication is not required for the oscilloscope.

6--4

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Removal and Installation Procedures

This section describes how to remove and install the major mechanical and
electrical modules. It provides the following information:

H Required Tools on page 6--6 describes the tools needed to perform the

procedures.

H List of Modules on page 6--5 describes where to locate a list of replaceable

modules.

H Summary of Procedures on page 6--6 lists the procedures for removal and

installation of modules.

H Rear Feet, on page 6--7, begins a series of procedures that describe the

removal and installation of modules.

Maintenance

Preparation

Read this section to prepare for module removal and installation.

WARNING. Only qualified personnel should perform service procedures. Before
doing this or any other procedure in this manual, read the General Safety
Summary and Service Safety Summary found at the beginning of this manual.

Always disconnect the power cord before disassembling any portion of the
oscilloscope.

To prevent damage to electrical components, read Preventing ESD on page 6--1.

H See Figure 8--1 on page 8--7 for an overview of how the entire oscilloscope is

assembled.

H Read the Summary of Procedures on page 6--6 to understand which

procedure to use to access a given module. Then read Required Tools on
page 6--6 for a list of tools needed to remove and install modules in the
oscilloscope.

H If you are disassembling the oscilloscope for cleaning, refer to Inspection

and Cleaning on page 6--2 for cleaning instructions.

List of Modules

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

The Replaceable Parts List provides a list of all replaceable modules. Any
electrical or mechanical module, assembly, or part listed in the parts list is
referred to as a module.

6--5

Maintenance

Summary of Procedures

Complete disassembly is best achieved by following the procedures in the order
given in Table 6--2 .

Table 6--2: List of procedures

Procedure Begins on page

Rear Feet 6--7

Flip Feet 6--9

Front-Panel Knobs 6--10

Power Button 6--10

Rear Case 6--10

Front Feet 6--14

Power Supply Module 6--15

Internal Assembly 6--17

Display Cable 6--19

Front-Panel Cable 6--21

Main Board Module 6--22

Display Module 6--24

Front-Panel Module 6--26

Required Tools

Keypad 6--28

Front Case 6--30

Use the following tools to remove and replace all modules in the oscilloscope:

H Torque-limiting screwdriver, long shank, 12 in-lb (1.3 N

⋅m) range with

Torx® T-15 tip

H 9/16 inch deep socket with wide center hole (S

⋅K Hand Tool Corp., S-K

#40818, or equivalent)

H Torque wrench to 40 in-lb (4.5 N

⋅m)

H Screwdriver with 1/4 inch flat blade

H Pliers (all-purpose and needle-nose)

H Sharp knife (X-ACTO

® knife or equivalent)

6--6

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

Rear Feet

You will need a flat-blade screwdriver to remove the rear feet.

Removal. To remove the rear feet, refer to Figure 6--1 and follow these steps:

1. Place the oscilloscope face down on a soft surface such as an anti-static mat.

2. Use a flat-blade screwdriver to pry out the foot, or twist the foot as you are

removing it so that it disengages from the guides. Use care not to mar the
surface of the rear case.

Figure 6--1: Removing the rear feet

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

6--7

Maintenance

Installation. To install the rear feet, refer to Figure 6--2 and follow these steps:

1. Place the oscilloscope face down on a soft surface such as an anti-static mat.

2. Align the slots of the rear foot with the guides in the rear case and press the

foot in.

6--8

Figure 6--2: Installing the rear feet

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

Flip Feet

You will need a pair of needle-nose pliers to remove the flip feet.

Removal. To remove the flip feet, refer to Figure 6--3 and follow these steps:

1. Place the oscilloscope face down on a soft surface such as an anti-static mat.

2. Grip the flip foot with the pliers as close to the notches as possible and

squeeze gently on the foot.

3. Twist slightly to swing one hinge free of the slot.

Hinge

To remove foot, squeeze at notches
and swing one hinge free of slot

Figure 6--3: Removing and installing the flip feet

To install foot, place hinge of

foot into one slot, then

swing other hinge into place

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

6--9

Maintenance

Installation. To install the flip feet, refer to Figure 6--3 and follow these steps:

1. Place the oscilloscope face down on a soft surface such as an anti-static mat.

2. Hold the flip foot with the smooth side facing down.

3. Gently squeeze the foot so that the hinge on one side fits into the slot, and

twist slightly to snap into the slot on the other side.

Front-Panel Knobs

Power Button

Rear Case

Remove each front-panel knob by firmly grasping the knob (with pliers if
necessary) and pulling it away from the front panel.

NOTE. Wrap the plier jaws with tape (such as electrical) to avoid marring the
knob surface.

Install front-panel knobs by aligning the keyed knob with the shaft and pressing
the knob onto the shaft.

Remove the power button by firmly grasping the button (with pliers if necessary)
and pull it straight out of the cabinet.

NOTE. Wrap the plier jaws with tape (such as electrical) to avoid marring the
button surface.

Install the button by pressing it onto the power button shaft until it snaps into
place.

You will need a torque-limiting Torx T-15 screwdriver and pliers for this
procedure.

6--10

Removal. To remove the rear case, refer to Figure 6--4 and follow these steps:

1. Remove the power button using the procedure on page 6--10.

2. If installed, remove the extension module from the rear of the oscilloscope.

For instructions, refer to the TDS1000- and TDS2000-Series User Manual.

CAUTION. To avoid damage, do not remove the rear case with an extension
module installed.

3. Place the oscilloscope face down on a soft surface such as an anti-static mat.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

4. Remove the four screws located on the rear case. Tilt the handle to gain
better access to the top two screws.

5. Lift the rear case off of the oscilloscope.

Remove rear case
screws (4)

ESD Grounding ears

Figure 6--4: Removing and installing the rear case

Rear case

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

6--11

Maintenance

Installation. Use this procedure to install the rear case.

1. Place the oscilloscope face down on a soft surface (such as an anti-static
mat).

2. Place the rear case onto the assembled oscilloscope and ensure that:

H All of the edges align with the front case.

H The ESD grounding ears align with the rear case slots. If not, they must

be bent into the correct position. Figure 6--5 shows proper alignment.

H The notches on the edge of the main board module align with ridges on

the rear case near the extension module connector slot. Figure 6--5 shows
the location of the notches.

CAUTION. Failure to properly align the ESD grounding ears may result in ESD
damage to the extension module and/or the oscilloscope. Refer to Figure 6--5.

Be careful not to pinch any wires or other parts between the front and rear cases.

3. Install the four screws in the rear case. Tilt the handle to better access the top
two holes.

CAUTION. Avoid cross threading the screws that secure the rear case to the front
case. An easy way to avoid this is to slip the screw into the hole and, using slight
pressure, slowly rotate the screw counterclockwise until you feel the screw slip
into the screw threads. Then tighten the screw clockwise. A properly started
screw will have very little resistance going in.

4. Install the power button as described on page 6--10.

6--12

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

Main board notches

Figure 6--5: Aligning the oscilloscope rear case

Rear case
slots (4)

ESD grounding ears (4)

ESD grounding ears are properly
aligned with the rear case slots when
they are visible in approximately one
half the width of the slots.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

6--13

Maintenance

Front Feet

You will need a torque-limiting Torx T-15 screwdriver and pliers for this
procedure.

Removal. First, remove the power button and rear case using the procedures on
page 6--10. Then, slide the front feet out of the front case as shown in Figure 6--6.

Installation. Slide the feet into the slots provided in the front case as shown in
Figure 6--6. Use the installation procedures for each module removed to
reassemble the oscilloscope.

Front foot

6--14

Figure 6--6: Removing and installing the front feet

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

Power Supply Module

Use a torque-limiting Torx T-15 screwdriver and pliers for this procedure.

Removal. To remove the module, refer to Figure 6--7 and follow these steps:

1. Remove the power button and rear case using the procedures on page 6--10.

2. Disconnect the following wires:

H The ground wire on the power supply module from the chassis ground

lug.

H The two-conductor backlight cable on the power supply module.

H The power supply ribbon cable on the main board at J101. Press down on

the latch while pulling up on the cable.

3. Remove the four screws connecting the power supply module to the chassis
and lift the module from the internal assembly.

Remove screws (4)

Power supply

ribbon cable

Ground wire

Backlight connector
(monochrome LCD)

Backlight cable
(color LCD)

Figure 6--7: Removing the power supply module

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

6--15

Maintenance

Installation. To install the power supply module, refer to Figure 6--8 and follow
these steps:

1. Align and place the power supply module into the internal assembly.

2. Install the four screws. Do not put a screw into the empty hole in Figure 6--8.

3. Reconnect the following wires:

H The ground wire on the power supply module to the chassis ground lug.

You may need to use pliers to secure the wire in place.

H The two-conductor backlight cable on the power supply module.

Connect to the black socket for a monochrome LCD, and to the white
socket for a color LCD.

H The power supply ribbon cable to the main board at J101. Twist the cable

four revolutions to keep it from contact with the boards and chassis.

4. Use the installation procedure for each module removed to reassemble the
oscilloscope.

Power supply module

Power supply ground wire

Chassis ground lug

Install screws (4)

Empty hole
NO SCREW

Backlight connector
(monochrome LCD)

Power supply

ribbon cable

Backlight cable
(color LCD)

6--16

Figure 6--8: Installing the power supply module

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

Internal Assembly

You will need a torque-limiting Torx T-15 screwdriver and a flat-blade screw­driver for this procedure.

Removal. To remove the assembly, refer to Figure 6--9 and follow these steps:

1. Remove the front-panel knobs, power button, and rear case using the
procedures on page 6--10.

2. Remove the four screws attaching the internal assembly to the front case.

3. Lift the entire internal assembly (consisting of the chassis, all of the boards,

and the display screen) out of the front case.

NOTE. The switch keypad will most likely remain inside the front case. It does not
need to be removed with the internal assembly.

Remove screws (4)

Figure 6--9: Removing and installing the internal assembly

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Internal

assembly

Front case

6--17

Maintenance

Installation. To install the internal assembly, refer to Figure 6--9 and follow these
steps:

1. Use the installation procedure for each module removed to reassemble the
oscilloscope.

2. Place the internal assembly into the front case.

3. Install the four screws to attach the internal assembly to the front case.

6--18

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

Display Cable

You will need a torque-limiting Torx T-15 screwdriver and pliers for this
procedure.

Removal. To remove the display cable, refer to Figure 6--10 and follow these
steps:

1. Remove the power button and rear case using the procedures on page 6--10.

2. Untwist the cable tie to release the display cable.

3. Disconnect the display cable at J201 on the main board by pulling straight up

from the connector.

4. Disconnect the display cable on the display module by pulling it through the
horizontal slot on the chassis.

Main board J201

Figure 6--10: Removing the display cable

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Display cable

Display cable slot on

the chassis

6--19

Maintenance

Installation. To install the display cable, refer to Figure 6--11 and follow these
steps:

1. Remove the display module using the procedure on page 6--24.

2. Attach the display cable to the appropriate connector on the display module

at the location shown in Figure 6--11: 12-pin for the monochrome display,
and 15-pin for the color display.

3. With the display module in place but not connected, thread the display cable
through the appropriate slot on the chassis.

4. Twist the cable two revolutions to keep it from contact with the boards and
chassis, and secure using the left cable tie.

5. Connect the display cable at J201 on the main board by pushing the cable
straight down into the connector.

6. Install the four screws to attach the display module to the internal assembly.

Display
module

Display cable

Figure 6--11: Installing the display cable

Internal

assembly

Main

board

6--20

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

Maintenance

Front-Panel Cable

You will need a torque-limiting Torx T-15 screwdriver and pliers for this
procedure.

Removal. To remove the front-panel cable, refer to Figure 6--12 and follow these
steps:

1. Remove the power button and rear case using the procedures on page 6--10.

2. Untwist the cable tie to release the front-panel cable.

3. Disconnect the front-panel cable at J202 on the main board by pulling

straight up from the connector.

4. Disconnect the front-panel cable at J1 on the front-panel module.

Front-panel cable

Main board

J202

Front-panel

module J1

Figure 6--12: Removing and installing the front-panel cable

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual

6--21

Maintenance

Installation. To install the front-panel cable, refer to Figure 6--12 and follow these
steps:

1. Connect the front-panel cable to the front-panel module at J1 through the
appropriate slot on the chassis.

2. Twist the cable two revolutions to keep it from contact with the boards and
chassis, and secure using the right cable tie.

3. Connect the front-panel cable at J202 on the main board by pushing the cable
straight down into the connector.

Main Board Module

You will need a torque-limiting Torx T-15 long shank screwdriver, a torque
wrench, and a 9/16 inch deep socket for this procedure.

CAUTION. The main board module is particularly sensitive to ESD. Read the

Preventing ESD section on page 6--1 before removing or installing the main
board.

Removal. To remove the main board module, refer to Figure 6--13 and follow
these steps:

1. Remove the power button and rear case using the procedures on page 6--10.

2. Remove the internal assembly from the front case using the procedure on

page 6--17.

3. Disconnect the following wires from the main board by pulling straight up
from the connector:

H The power supply ribbon cable at J101. Press down on the latch while

pulling up on the cable.

H The display cable at J201.

6--22

H The front-panel cable at J202.

4. Use the screwdriver to remove the two screws attaching the main board
module to the internal assembly.

5. Use the socket to remove the nuts and washers from the BNC connectors.

6. Pull the board out from the front slots of the internal assembly.

TDS1000 and TDS2000 Series Digital Storage Oscilloscopes Service Manual