Tektronix 4000 Series User manual

Service Manual
Tektronix 4000 Series
Digital Phosphor Oscilloscopes
071-2137--00
This document applies to firmware version 2.00
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. 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.
TekLink is a trademark of Tektronix, Inc.
Tektronix is an authorized licensee of the CompactFlash®trademark.
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:
HIn North America, call 1-800-833-9200.
HWorldwide, visit www.tektronix.com to find contacts in your area.

Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual i
Table of Contents
General Safety Summary iii...................................
Service Safety Summary v....................................
Environmental Considerations vii...............................
Preface ix...................................................
Manual Conventions ix..............................................
Related Documentation ix...........................................
Operating Information 1--1.....................................
Theory of Operation 2--1.......................................
Block Diagrams 2--1.................................................
Power Supply 2--2...................................................
I/O Board 2--2......................................................
Main Board 2--2.....................................................
Front--Panel Board 2--3...............................................
Adjustment Procedures 3--1.....................................
Required Equipment 3--1..............................................
Overview of the Adjustment Process 3--2.................................
Factory Adjustment Procedure 3--4......................................
Completing the Procedure 3--8.........................................
Maintenance 4--1..............................................
Preventing ESD 4--1.................................................
Inspection and Cleaning 4--1...........................................
General Care 4--2................................................
Interior Cleaning 4--2.............................................
Exterior Cleaning 4--2............................................
Overview of Removal Procedures 4--6...................................
Removal Procedures 4--8..............................................
Troubleshooting 4--12.................................................
Troubleshooting Procedure 4--13.........................................
Unpacking and Repacking Instructions 4--16...............................
Mechanical Parts List 5--1......................................
Parts Ordering Information 5--1.........................................
Using the Replaceable Parts List 5--2....................................

Table of Contents
ii Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual
List of Tables
Table 4--1: External inspection check list 4--3......................
Table 4--2: Internal inspection check list 4--4......................
List of Figures
Figure 2--1: Oscilloscope module interconnections 2--1...............
Figure 3--1: Rear panel 3--4.....................................
Figure 3--2: Utility page menu 3--5...............................
Figure 3--3: Calibration selection 3--6.............................
Figure 3--4: Factory information dialog 3--6.......................
Figure 3--5: Digital channel input 3--10............................
Figure 4--1: Locator for trim and cabinet removal 4--7...............
Figure 4--2: Locator for internal modules 4--8......................
Figure 4--3: Primary troubleshooting procedure 4--13................
Figure 4--4: AC power supply troubleshooting procedure 4--14.........
Figure 4--5: Module isolation troubleshooting procedure 4--15.........
Figure 5--1: Exploded view, case 5--5..............................
Figure 5--2: Exploded view: DPO4000 front panel and display,
4-channel instruments 5--7...................................
Figure 5--3: Exploded view: MSO4000 front panel and display,
4-channel instruments 5--9...................................
Figure 5--4: Exploded view: DPO4000 front panel and display,
2-channel instruments 5--11...................................
Figure 5--5: Exploded view: MSO4000 front panel and display,
2-channel instruments 5--13...................................
Figure 5--6: Exploded view: DPO4000 Power Supply
and I/O board 5--15.........................................
Figure 5--7: Exploded view: MSO4000 Power Supply
and I/O board 5--17.........................................
Figure 5--8: Exploded view: DPO4000 Main board,
Inverter board, and side fans 5--19.............................
Figure 5--9: Exploded view: MSO4000 Main board,
Inverter board, and side fans 5--21.............................

Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual iii
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
To avoid potential hazards, use this product only as specified.
Only qualified personnel should perform service procedures.
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Connect and Disconnect Properly. 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.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
The inputs are not rated for connection to mains or Category II, III, or IV
circuits.
Connect the probe reference lead to earth ground only.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
ToAvoidFireor
Personal Injury

General Safety Summary
iv Tektronix 4000 Series Digital Phosphor Oscilloscopes Service 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.
These terms may appear on the product:
HDANGER indicates an injury hazard immediately accessible as you read the
marking.
HWARNING indicates an injury hazard not immediately accessible as you
read the marking.
HCAUTION indicates a hazard to property including the product.
The following symbols may appear on the product:
CAUTION
Refer to Manual
Protective Ground
(Earth) Terminal Chassis Ground Mains Connected
ON (Power) Push button OUT
Push button
IN
Terms in this Manual
Symbols and Terms
on the Product

Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual v
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, switch off the instrument power, then
disconnect the power cord from the mains power.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.
To avoid electric shock, do not touch exposed connections.

Service Safety Summary
vi Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual

Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual vii
Environmental Considerations
This section provides information about the environmental impact of the
product.
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.
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.
Product End-of-Life
Handling
Restriction of Hazardous
Substances

Environmental Considerations
viii Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual

Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual ix
Preface
This service manual provides information that you need to troubleshoot,
disassemble, and replace parts on the Tektronix 4000 Series Digital Phosphor
Oscilloscopes.
Manual Conventions
This manual uses certain conventions that you should become familiar with
before attempting service.
Throughout this manual, any replaceable component, assembly, or part is
referred to by the term module. A module is composed of electrical and
mechanical assemblies, circuit boards, interconnecting cables, and
user-accessible controls.
This manual refers to any field-replaceable assembly or mechanical part
specifically by its name or generically as a replaceable part. In general, a
replaceable part is any circuit board or assembly, such as the hard disk drive, or a
mechanical part, such as the I/O port connectors, that is listed in the replaceable
parts list.
Symbols and terms related to safety appear in the General Safety Summary found
at the beginning of this manual.
Related Documentation
To read about Use these documents
Installation and Operation Tektronix 4000 Series Digital Phosphor Oscilloscopes User
Manual (available in 11 languages)
Specifications and Performance Tektronix 4000 Series Technical Reference (PDF only)
Programmer Commands Tektronix 4000 Series Programmer Manual (PDF only)
Analysis and Connectivity Tools Getting Started with OpenChoice®Solutions Manual
Modules
Replaceable Parts
Safety

Preface
xTektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual
To read about Use these documents
Installing and testing applica-
tions modules
Tektronix 4000 Series Application Modules Installation
Instructions Manual
Oscilloscope calibrator Fluke Oscilloscope Calibrator Manual at
http://us.fluke.com

Operating Information

Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual 1-1
Operating Information
For information on installing and operating your DPO4000 or your MSO4000
Series Digital Phosphor Oscilloscope, refer to the Tektronix 4000 Series Digital
Phosphor Oscilloscopes User Manual.
This manual is available, in 11 languages, on the Web at www.tektronix.com.

Operating Information
1-2 Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual

Theory of Operation

Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual 2-1
Theory of Operation
This chapter describes the electrical operation of the oscilloscope to the module
level. Figure 2--1 shows the oscilloscope module interconnections.
Block Diagrams
Power
Supply
Main board
Front Panel
Input ports for
application
modules
Attenuator circuit
Display
back light
inverter
power
LCD
Display
Ch 1
Ch 1
Ch 2
Ch 2 Ch 3 Ch 4
2-channel oscilloscopes
3 Fans
AC Line
4-channel oscilloscopesAux in
Ethernet
port
I/O Board
CompactFlash
Port
Trigger
Out
J100
J570
J571
J850
J930
Bezel
buttons
J130
J420, J421
J0480 J1
USB
J120
J510
Aux in
J680
XGA
Video
port
J170
J440 J610
J140
Figure 2- 1: Oscilloscope module interconnections

Theory of Operation
2-2 Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual
Power Supply
The Power Supply board converts AC line voltage to +12 V to power for all
internal circuits.
I/O Board
The I/O board contains USB ports, a CompactFlash port, an Ethernet port
(LAN), an XGA Video port, and a Trigger Out BNC connector.
Main Board
The Main board module contains the following functions:
The Acquisition system begins with the analog signal path and ends with a
digitized signal in memory. The signal enters a channel input, and then passes
through an attenuator and preamplifier. The analog signal from each preamplifier
goes through a digitizer, a time base controller, and then into acquisition
memory. The analog signal from each preamplifier is also distributed to a trigger
circuit.
The Trigger system processes the analog signals from the preamplifiers and
sends trigger information to the time--base controller. Advanced trigger functions
are enabled only when the appropriate application modules and supporting
software are installed.
The Display system combines live waveform data from acquisition memory with
menus and text, and stores this information in display memory. It then uses this
data to refresh the XGA display module (LCD).
Acquisition System
Trigger System
Display System