Tektronix MDO3000 Series User manual

xx
MDO3000 Series
Mixed Domain Oscilloscopes
ZZZ
Service Manual
*P077098100*
077-0981-00

MDO3000 Series
Mixed Domain Oscilloscopes
ZZZ
Service Manual
xx
Revision A
Warning
The servicing instructions are for use by qualified personnel
only. To avoid personal injury, do not perform any servicing
unless you are qualified to do so. Refer to all safety summaries
prior to performing service.
www.tek.com
077-0981-00

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

Table of Contents
Important Safety Information .................................................................................... iv
General Safety Summary .................................................................................... iv
Service Safety Summary.................................................................................... vii
Terms in This Manual....................................................................................... viii
Symbols and Terms on the Product........................................................................ viii
Preface .............................................................................................................. ix
Manual Conventions.......................................................................................... ix
Where to Find Operating Information............................................................................ 1
Theory of Operation................................................................................................ 3
Power Supply................................................................................................... 3
I/O Board ....................................................................................................... 3
Main Board, Mezzanine Board, and Analog Board........................................................ 3
Front-Panel Board ............................................................................................. 4
Adjustments......................................................................................................... 7
Maintenance......................................................................................................... 9
Preventing ESD................................................................................................ 9
Inspection and Cleaning....................................................................................... 9
Module Removal.............................................................................................. 13
Troubleshooting............................................................................................... 15
Troubleshooting Procedure .................................................................................. 15
Unpacking and Repacking Instructions .................................................................... 19
Replaceable Parts List............................................................................................. 21
Parts Ordering Information .................................................................................. 21
Using the Replaceable Parts List............................................................................ 23
MDO3000 Series Mixed Domain Oscilloscopes Service Manual i

Table of Contents
List of Figures
Figure 1: MDO3000 Series block diagram...................................................................... 5
Figure 2: Removing tabs from the front protective cover..................................................... 13
Figure 3: Module locator ......................................................................................... 14
Figure 4: Primary troubleshooting procedure .................................................................. 16
Figure 5: AC power supply troubleshooting procedure....................................................... 17
Figure 6: Module isolation troubleshooting procedure........................................................ 18
Figure 7: Exploded view, front panel assembly................................................................ 26
Figure 8: Display, analog board, and main board assembly .................................................. 28
Figure 9: Rear chassis and connecting modules ............................................................... 30
ii MDO3000 Series Mixed Domain Oscilloscopes Service Manual

Table of Contents
List of Tables
Table 1: External inspection checklist........................................................................... 11
Table 2: Internal inspection checklist ........................................................................... 12
Table 3: Parts list column descriptions.......................................................................... 23
Table 4: Front panel assembly ................................................................................... 24
Table 5: Display, analog board, and main board............................................................... 27
Table 6: Rear chassis and connecting modules ................................................................ 29
MDO3000 Series Mixed Domain Oscilloscopes Service Manual iii

Important Safety Information
Important Safety Information
This manual contains information and warnings that must be followed by the user
for safe operation and to keep the product in a safe condition.
To safely perform service on this product, additional information is provided at
the end of this section. (See page vii, Service Safety Summary.)
General Safety Summary
Use the product only as specified. Review the following safety precautions to
avoid injury and prevent damage to this product or any products connected to it.
Carefully read all instructions. Retain these instructions for future reference.
Comply with local and national safety codes.
For correct and safe operation of the product, it is essential that you follow
generally accepted safety procedures in addition to the safety precautions specified
in this manual.
The product is designed to be used by trained personnel only.
Only qualified personnel who are aware of the hazards involved should remove
the cover for repair, maintenance, or adjustment.
Before use, always check the product with a known source to be sure it is
operating correctly.
This product is not intended for detection of hazardous voltages.
Use personal protective equipment to prevent shock and arc blast injury where
hazardous live conductors are exposed.
While using this product, you may need to access other parts of a larger system.
Read the safety sections of the other component manuals for warnings and
cautions related to operating the system.
When incorporating this equipment into a system, the safety of that system is the
responsibility of the assembler of the system.
To avoid fire or personal
injury
Use proper power cord. Use only the power cord specified for this product and
certified for the country of use. Do not use the provided power cord for other
products.
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, make sure that the product is properly grounded.
Do not disable the power cord grounding connection.
iv MDO3000 Series Mixed Domain Oscilloscopes Service Manual

Important Safety Information
Power disconnect. The power cord disconnects the product from the power
source. See instructions for the location. Do not position the equipment so that
it is difficult to operate the power cord; it must remain accessible to the user at
all times to allow for quick disconnection if needed.
Connect and disconnect properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Use only insulated voltage probes, test leads, and adapters supplied with the
product, or indicated by Tektronix to be suitable for the product.
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. Do not exceed the
Measurement Category (CAT) rating and voltage or current rating of the lowest
rated individual component of a product, probe, or accessory. Use caution when
using 1:1 test leads because the probe tip voltage is directly transmitted to the
product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do not float the common terminal above the rated voltage for that terminal.
Do not operate without covers. Do not operate this product with covers or panels
removed, or with the case open. Hazardous voltage exposure is possible.
Avoid exposed circuitry. Do not touch exposed connections and components
when power is present.
Do not operate with suspected failures. If you suspect that there is damage to this
product, have it inspected by qualified service personnel.
Disable the product if it is damaged. Do not use the product if it is damaged
or operates incorrectly. If in doubt about safety of the product, turn it off and
disconnect the power cord. Clearly mark the product to prevent its further
operation.
Before use, inspect voltage probes, test leads, and accessories for mechanical
damage and replace when damaged. Do not use probes or test leads if they are
damaged, if there is exposed metal, or if a wear indicator shows.
Examine the exterior of the product before you use it. Look for cracks or missing
pieces.
Useonlyspecified replacement parts.
Use proper fuse. Use only the fuse type and rating specified for this product.
Do not operate in wet/damp conditions. Be aware that condensation may occur if
a unit is moved from a cold to a warm environment.
MDO3000 Series Mixed Domain Oscilloscopes Service Manual v

Important Safety Information
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry. Remove the input signals before you clean
the product.
Provide proper ventilation. Refer to the installation instructions in the manual for
details on installing the product so it has proper ventilation.
Slots and openings are provided for ventilation and should never be covered or
otherwise obstructed. Do not push objects into any of the openings.
Provide a safe working environment. Always place the product in a location
convenient for viewing the display and indicators.
Avoid improper or prolonged use of keyboards, pointers, and button pads.
Improper or prolonged keyboard or pointer use may result in serious injury.
Be sure your work area meets applicable ergonomic standards. Consult with an
ergonomics professional to avoid stress injuries.
Use only the Tektronix rackmount hardware specified for this product.
Probes and test leads Before connecting probes or test leads, connect the power cord from the power
connector to a properly grounded power outlet.
Keep fingers behind the finger guards on the probes.
Remove all probes, test leads and accessories that are not in use.
Use only correct Measurement Category (CAT), voltage, temperature, altitude,
and amperage rated probes, test leads, and adapters for any measurement.
Beware of high voltages. Understand the voltage ratings for the probe you are
using and do not exceed those ratings. Two ratings are important to know and
understand:
The maximum measurement voltage from the probe tip to the probe reference
lead.
The maximum floating voltage from the probe reference lead to earth ground
These two voltage ratings depend on the probe and your application. Refer to the
Specifications section of the manual for more information.
WARNING. To prevent electrical shock, do not exceed the maximum measurement
or maximum floating voltage for the oscilloscope input BNC connector, probe
tip, or probe reference lead.
Connect and disconnect properly. Connect the probe output to the measurement
product before connecting the probe to the circuit under test. Connect the
vi MDO3000 Series Mixed Domain Oscilloscopes Service Manual

Important Safety Information
probe reference lead to the circuit under test before connecting the probe input.
Disconnect the probe input and the probe reference lead from the circuit under test
before disconnecting the probe from the measurement product.
Connect and disconnect properly. De-energize the circuit under test before
connecting or disconnecting the current probe.
Connect the probe reference lead to earth ground only.
Do not connect a current probe to any wire that carries voltages above the current
probe voltage rating.
Inspect the probe and accessories. Before each use, inspect the probe and
accessories for damage (cuts, tears, or defects in the probe body, accessories, or
cable jacket). Do not use if damaged.
Ground-referenced oscilloscope use. Do not float the reference lead of this probe
when using with ground-referenced oscilloscopes. The reference lead must be
connected to earth potential (0 V).
ServiceSafetySummary
The ServiceSafetySummarysection contains additional information required to
safely perform service on the product. Only qualified personnel should perform
service procedures. Read this Service Safety Summary and the General Safety
Summary before performing any service procedures.
To avoid electric shock. Do not touch exposed connections.
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 product power and
disconnect the power cord from the mains power before removing any covers or
panels, or opening the case for servicing.
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.
Verify safety after repair. Always recheck ground continuity and mains dielectric
strength after performing a repair.
MDO3000 Series Mixed Domain Oscilloscopes Service Manual vii

Important Safety Information
Terms in This Manual
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Symbols and Terms on the Product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read
the marking.
WARNING indicates an injury hazard not immediately accessible as you
read the marking.
CAUTION indicates a hazard to property including the product.
When this symbol is marked on the product, be sure to consult the manual
to find out the nature of the potential hazards and any actions which have to
betakentoavoidthem. (Thissymbolmayalsobeusedtorefertheuserto
ratings in the manual.)
The following symbol(s) may appear on the product:
viii MDO3000 Series Mixed Domain Oscilloscopes Service Manual

Preface
This service manual provides information that you need to troubleshoot,
disassemble, and replace parts on the following Tektronix oscilloscopes:
Model Bandwidth Analog channels RF frequency
MDO3012 100 MHz 2 Upto3GHz
MDO3014 100 MHz 4 Upto3GHz
MDO3022 200 MHz 2 Upto3GHz
MDO3024 200 MHz 4 Upto3GHz
MDO3032 350 MHz 2 Upto3GHz
MDO3034 350 MHz 4 Upto3GHz
MDO3052 500 MHz 2 Upto3GHz
MDO3054 500 MHz 4 Upto3GHz
MDO3102 1 GHz 2Upto3GHz
MDO3104 1 GHz 4Upto3GHz
Manual Conventions
This manual uses certain conventions that you should become familiar with
before performing service.
Modules Throughout this manual, any replaceable component, assembly, or part is referred
to by the term module.
Replaceable Parts This manual refers to any field-replaceable assembly or mechanical part
specifically by its name or generically as a replaceable part. In general, a
replaceable part is any circuit board or assembly, such as the hard disk drive, or a
mechanical part, such as the I/O port connectors, that is listed in the replaceable
parts list.
Safety Symbols and terms related to safety appear in the General Safety Summary.
Information for service procedures appears in both the General Safety Summary
and the Service Safety Summary.
MDO3000 Series Mixed Domain Oscilloscopes Service Manual ix

Preface
x MDO3000 Series Mixed Domain Oscilloscopes Service Manual

WheretoFindOperatingInformation
For information on installing and operating your oscilloscope, refer to the
Tektronix MDO3000 Series Mixed Domain Oscilloscopes User Manual, which
was included on the documentation CD provided with your oscilloscope. This
manual is available in 11 languages.
MDO3000 Series Mixed Domain Oscilloscopes Service Manual 1

Where to Find Operating Information
2 MDO3000 Series Mixed Domain Oscilloscopes Service Manual

Theory of Operation
This chapter describes the electrical operation of the oscilloscope to the module
level. The block diagram shows the oscilloscope module interconnections. (See
Figure 1 on page 5.)
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, an Ethernet port (LAN), a VGA Video port, an
AUX OUT BNC connector, and the AFG generator output connector.
Main Board, Mezzanine Board, and Analog Board
The Main and Analog boards contain the following functions:
Acquisition System 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, and then into acquisition memory. The analog signal
from each preamplifier is also distributed to a trigger circuit.
All of the inputs (including RF) are routed to the Analog board. The analog
channels are amplified and attenuated through the front-end circuitry, and are
output to the Main board. The RF channel is the same except that the RF input
signal is routed through a shared connection with analog CH4. The analog board
has a controller that is used as an I/O controller for the front-end (Analog board).
Trigger System The Trigger system digitizes the analog signals from the preamplifiers and
routes the digitized signal to the Trigger ASIC. Advanced trigger functions are
enabled only when the appropriate application modules and supporting software
are installed.
Display System The Display system combines live waveform data from acquisition memory with
menus and text, and stores this informationindisplaymemory.Itthenusesthis
data to refresh the WVGA display module (LCD).
MDO3000 Series Mixed Domain Oscilloscopes Service Manual 3

Theory of Operation
Processor System The Processor system contains a microprocessor that controls the entire
instrument. The processor system also contains FLASH ROM, system RAM, and
interfaces to USB ports and the Ethernet port.
Power Converter The Mezzanine board converts the +12 V power to other voltages used for the
analog and digital circuitry throughout the system. The +5 V standby power is
used to keep the Front Panel powered up at all times that AC power is connected
to the unit.
Front-Panel Board
The Front Panel board contains a microprocessor that reads the front-panel
buttons and controls, sends this information to the processor system on the Main
board, and controls power to the system. The Front Panel board also generates
the probe compensation output signal, provides an interface to the application
modules, and controls power to the system.
4 MDO3000 Series Mixed Domain Oscilloscopes Service Manual

Theory of Operation
Figure 1: MDO3000 Series block diagram
MDO3000 Series Mixed Domain Oscilloscopes Service Manual 5

Theory of Operation
6 MDO3000 Series Mixed Domain Oscilloscopes Service Manual