Tektronix MSO4104B, MSO4104B-L, MSO4102B, MSO4054B, MSO4102B-L Service Manual

xx

MSO4000B and DPO4000B Series

ZZZ

Digital Phosphor Oscilloscopes

Service Manual

*P077051201*

077-0512-01

xx

MSO4000B and DPO4000B Series

ZZZ

Digital Phosphor Oscilloscopes

Service Manual

This document applies to 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

077-0512-01

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries
or suppliers, and are protected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication
supersedes that in all previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc.
14150 SW Karl Braun Drive
P.O . Bo x 50 0
Beaverto
USA

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

n, OR 97077

In North America, call 1-800-833-9200.
World wide , vis i t www.tektronix.com to find contacts in your area.

Table of Contents

General Safety Summary ......................................................................................... iv

Preface ............................................................................................................. vii

Manual Conventions...... .................................. ................................ ................. vii

Where to Fin

Theory of Operation... ................................ ................................ ............................. 3

Power Supply................................................................................................... 3

I/O Board ........................ ................................ ................................ ............... 3

Main Board and Analog Board............................................................................... 3

Front-Panel Board ...... ................................ ................................ ....................... 4

Adjustm

Required Equipment.... ................................ ................................ ....................... 7

Before Adjustments......... ................................ .................................. ................. 8

Navigating During Adjustments .. .................................. ................................ ......... 8

Connecting the Equipment......... ................................ .................................. ......... 9

Factory Adjustment Procedure .............................................................................. 10

Sett

Maintenance........................................................................................................ 19

Preventing ESD............................................................................................... 19

Inspection and Cleaning.............................. ................................ ........................ 19

Module Removal.... ................................ .................................. ........................ 23

Troubleshooting......... ................................ ................................ ...................... 25

Tr

Unpacking and Repacking Instructions .......... ................................ .......................... 29

Replaceable Parts List........................................... ................................ .................. 31

Parts Ordering Information .................................................................................. 31

Using the Replaceable Parts List............................................................................ 32

d Operating Information......................... ................................ ................... 1

ent Procedure... .................................. ................................ ......................... 7

ing the Calibrator Output Signal........................................................................ 13

oubleshooting Procedure .... .................................. ................................ ............ 25

MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual i

Table of Contents

List of Figure

Figure 1: Four-channel model MSO4000B and DPO4000B series block diagram .......... ............... 5

Figure 2: Tw

Figure 3: Removing tabs from the front protective cover..................................................... 23

Figure 4: Module locator ..... .................................. ................................ .................. 24

Figure 5: Primary troubleshooting procedure .................................................................. 26

Figure 6: AC power supply troubleshooting procedure....................................................... 27

Figure 7: Module isolation troubleshooting procedure........................................................ 28

Figure 8:

Figure 9: Display, Analog board, and Main board assembly ................................................ 36

Figure 10: Rear chassis and connecting modules .............................................................. 38

Figure 11: External parts ......................................................................................... 39

Figure 12: Rear chassis, showing cables and connectors ....... ................................ .............. 40

Figure 13: Main board, showing cable and connectors ....................................................... 41

o-channel model MSO4000B and DPO4000B series block diagram................. ......... 6

Exploded view, Front Panel assembly............................................................... 34

s

ii MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual

List of Tables

Table 1: External inspection checklist................................... ................................ ........ 21

Table 2: Int

Table 3: Parts list column descriptions.................................. ................................ ........ 32

Table 4: Replaceable parts – Front Panel assembly ............. .................................. ............ 33

Table 5: Replaceable parts – Display, Analog board, and Main board ...................................... 35

Table 6: Replaceable parts – Rear chassis and connecting modules ........ ................................ 37

Table 7: Replaceable parts – external parts..................................................................... 39

Table 8: R

Table 9: Replaceable parts – cable and connectors, Main board ............................................. 41

ernal inspection checklist ... ................................ .................................. ...... 21

eplaceable parts – cable and connectors, rear chassis ............... .............................. 40

Table of Contents

MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual iii

General Safety Summary

General Safet

To Avoid Fire or Personal

Injury

ySummary

Review the fo
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.

Connect and disconnect properly. De-energize the circuit under test before
connecting or disconnecting the current probe.

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 a void 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.

llowing safety precautions to avoid injury and prevent damage to

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 o f that termi

Power disconnect. The power cord disconnects the product from the power source.
Donotblockthepowercord;itmustremain accessible to the user at all times.

Do not operate without covers. Do not operate this product with covers or panels
removed.

Do not operate with suspected failures. If you suspect that there is damage to this
product, have it inspected by qualified service personnel.

Avoid exposed circuitry. Do not touch exposed connections and components when
power is present.

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.

nal.

iv MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual

General Safety Summary

TermsinThisManual

Symbols and Terms on the

Product

These terms may

WAR N ING. 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:

DANGER in
the marking.

WAR N IN G
read the marking.

CAUTIO

The following symbol(s) may appear on the product:

appear in this manual:

dicates an injury hazard immediately accessible as you read

indicates an injury hazard not immediately accessible as you

N indicates a hazard to property including the product.

MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual v

General Safety Summary

vi MSO4000B and DPO4000B Series Digital Phosphor 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

Manual Conventions

MSO4104B 1 GHz

MSO4104B-L 1 GHz

MSO4102B 1 GHz

MSO4102B-L 1 GHz

MSO4054B

MSO4034B

DPO4104B 1 GHz

DPO4104B-L 1 GHz

DPO4102B 1 GHz

DPO4102B-L 1 GHz

DPO4054B

DPO4034B

500 MHz 4

350 MHz 4

500 MHz 4

350 MHz 4

4

4

2

2

4

4

2

2

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 r eplaceable 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.

MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual vii

Preface

viii MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual

WheretoFindOperatingInformation

For information on installing and operating your DPO4000B or your MSO4000B
Series Digital Phosphor Oscilloscope, refer to the Tektronix MSO4000B Series

and DPO4000B

provided with your oscilloscope. This manual is also available, in 11 languages,
at www.tektronix.com/manuals.

Series Digital Phosphor Oscilloscopes User Manual, which was

MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual 1

Where to Find Operating Information

2 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual

Theory of Operation

This chapter describes the electrical operation of the oscilloscope to the module
level. The block diagrams show four-channel and two-channel oscilloscope
module inter

Power Supply

connections. (See Figure 1 on page 5.) (See Figure 2 on page 6.)

The Power S
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 an EXT REF IN BNC connector.

Main Board and Analog Board

The Main and Analog boards contain the following functions:

Acquisition System

Trigger System

The Ac
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.

quisition system begins with the analog signal path and ends with a

upply board converts AC line voltage to +12 V to power for all

splay System

Di

Processor System

MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual 3

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).

The Processor system contains a 460EX Power PC microprocessor that controls
the entire instrument. The processor system also contains FLASH ROM, system
RAM, and interfaces to USB ports and the Ethernet port.

Theory of Operation

Power Converter

Front-Panel Board

The Power Conve
main power supply and generates voltages for the analog and digital circuitry on
the Main board. The front panel receives the +5 V standby power, and uses input
from the power switch to turn the oscilloscope on and off.

The Front Panel board contains a microprocessor that reads the front-panel buttons
and controls, and then sends this information to the processor system on the Main
board. The Front Panel board also generates the probe compensation output signal
and provid

es an interface to the application modules.

rter receives +12 V power and +5 V standby power from the

4 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual